100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	Name the authors of the following : (a) David Copperfield (b) Emma (c) Piers the Plowman
Answer» (a) David Copperfield- Charles Dekens (b) Emma - Jane Austen (c) Piers the plowman - William Langland

1.

Name the authors of the following : (a) David Copperfield (b) Emma (c) Piers the Plowman

Answer»

(a) David Copperfield- Charles Dekens

(b) Emma - Jane Austen

(c) Piers the plowman - William Langland

Discussion

2.	Name the authors of the following works:(a) The Merchant of Venice(b) The Gitanjali.
Answer» (a) Shakespeare (b) Rabindranath Tagore

2.

Name the authors of the following works:(a) The Merchant of Venice(b) The Gitanjali.

Answer»

(a) Shakespeare

(b) Rabindranath Tagore

Discussion

3.	Read the following text and answer the questions given below it:Orphaned (lost his parents) at a very young age, Salim Ali was brought up by his maternal uncle. As a child, Salim was given an expensive airgun as a present and spent all his time shooting sparrows around the house. One day he noticed that one of the sparrows he had shot at had a yellow throat.He couldn’t hold (was unable to stop) his curiosity and approached his uncle. His uncle, who was equally clueless (no information /knowledge or idea of something), took him to the Bombay Natural History Society (BNHS) in the hope of finding an answer.there, the honorary secretary, W. S. Milliard told him that the bird was the Yellow Throated Sparrow. Milliard also told him about the variety of sparrows. That day Salim decided that he was going to be an ornithologist (a person who studies birds).No one would have imagined that the bird shooter would become a bird lover and nature conservator (a person who protects values or things) one day!!(1) By whom was Salim brought up ? Why ?(2) What was Salim given as a present ? What did he do with it?(3) Why did young Salim’s uncle take him to BNHS?(4) When did Salim Ali decide to become an ornithologist?
Answer» (1) Salim was brought up by his maternal uncle as he had lost his parents at a very young age. (2) Salim was given an expensive airgun as a present. He shot a yellow throated sparrow with it. (3) Young Salim’s uncle took him to BNHS / to satisfy Salim’s curiosity about the yellow throated l sparrow that he had shot. (4) Salim Ali decided to become an ornithologist on the day he visited BNHS with his uncle.

3.

Read the following text and answer the questions given below it:Orphaned (lost his parents) at a very young age, Salim Ali was brought up by his maternal uncle. As a child, Salim was given an expensive airgun as a present and spent all his time shooting sparrows around the house. One day he noticed that one of the sparrows he had shot at had a yellow throat.He couldn’t hold (was unable to stop) his curiosity and approached his uncle. His uncle, who was equally clueless (no information /knowledge or idea of something), took him to the Bombay Natural History Society (BNHS) in the hope of finding an answer.there, the honorary secretary, W. S. Milliard told him that the bird was the Yellow Throated Sparrow. Milliard also told him about the variety of sparrows. That day Salim decided that he was going to be an ornithologist (a person who studies birds).No one would have imagined that the bird shooter would become a bird lover and nature conservator (a person who protects values or things) one day!!(1) By whom was Salim brought up ? Why ?(2) What was Salim given as a present ? What did he do with it?(3) Why did young Salim’s uncle take him to BNHS?(4) When did Salim Ali decide to become an ornithologist?

Answer»

(1) Salim was brought up by his maternal uncle as he had lost his parents at a very young age.

(2) Salim was given an expensive airgun as a present. He shot a yellow throated sparrow with it.

(3) Young Salim’s uncle took him to BNHS / to satisfy Salim’s curiosity about the yellow throated l sparrow that he had shot.

(4) Salim Ali decided to become an ornithologist on the day he visited BNHS with his uncle.

Discussion

4.	Complete the following sentences on the basis of your textual reading :(a) This means that cheap daily,paper which goes everywhere and has the most ...........(b) India has always been part of my .......... in my life.
Answer» (a) This means that cheap daily,paper which goes everywhere and has the most Civilization and culture, (b) India has always been part of my Background in my life.

4.

Complete the following sentences on the basis of your textual reading :(a) This means that cheap daily,paper which goes everywhere and has the most ...........(b) India has always been part of my .......... in my life.

Answer»

(a) This means that cheap daily,paper which goes everywhere and has the most Civilization and culture,

(b) India has always been part of my Background in my life.

Discussion

5.	I’ve spent _____ money this week! I don’t know where it’s all gone. A) such B) so many C) so much D) so
Answer» Correct option is C) so much

Discussion

6.	I don’t know her well, but I’ve met her ________ times. A) plenty B) another C) severalD) more
Answer» Correct option is C) several

Discussion

7.	Write a brief note on the Indian English.
Answer» Note on the Indian English. English is said to be the link language of the world. The future of English is very bright in India. It played very important role in our freedom movement. Bcause of English, different people of different casts and religions, speaking different languages as well as living in different states, came on one stage. It gave an energy to our freedom movements. Indian have, partly or wholy, need of English in prohabably every field. English also works to remove unemployment. Thousands of employees, who know how to speak English, work in call-centres and earn a handsome salary. The future of English is very bright in India also because we can not do anything without English. It is the language of international trade, commerce and science. All recent inventions and discoveries are found in English language. So, we can not take a single step without English. Hence, the future of English is very bright in India.

7.

Write a brief note on the Indian English.

Answer»

Note on the Indian English.

English is said to be the link language of the world. The future of English is very bright in India. It played very important role in our freedom movement. Bcause of English, different people of different casts and religions, speaking different languages as well as living in different states, came on one stage. It gave an energy to our freedom movements.

Indian have, partly or wholy, need of English in prohabably every field. English also works to remove unemployment. Thousands of employees, who know how to speak English, work in call-centres and earn a handsome salary.

The future of English is very bright in India also because we can not do anything without English. It is the language of international trade, commerce and science. All recent inventions and discoveries are found in English language. So, we can not take a single step without English.

Hence, the future of English is very bright in India.

Discussion

8.	Summarise the pieces of The Earth.
Answer» All that the Johnson had was the earth. Very often in seemed as if it were all they had even had. It was true that they also had possessions-a plough, a two -wheeled cart, tools,abony brown mare which slowly dragged the plough and the cart about their rough four-acre plot-but without the earth these things were unless. I was true that they also had a son. It was more than thirty years since the Johnons, realising that he was not quite like others, had taken Benjy to a doctor. This doctor had persuaded them that the needed interests that would stregthen his mind. It would be good if they gave him something to do, some occupation. which would help his development. It would help a great deal if they gave him a special interest to feed him sense of responsibility. You are people on the land, the doctor said, let him keep hens. So for many years Benjy had kept hens, and what the earth was to his mother and father the hens were to Benjy. They were almost all he had. When he came from shcool, cut off by his simplicity from other children, Benjy went strainght home to his hens, which he kept in a wire coop that his father had made at the back of the house. At first he kept Ten or a dozen hens, all colours and breeds, brown and specked and black and white, and the coop was small. He fed the hens simply, on scraps from the table, seeded cabbages strung from the write, a little maize, and on corn ears which be gleaned in the late summer from his father is ocre of stubble. It is possible that a hen, being a simple creature thrives best on simple treatment. Benjy understood the first and last thing about a hen. That it exits for the became hightly complicated and commercialized. Eggs were cheap, hens mysteriously pecked Nourishment off the bore earth. They sat in a home-made Nesting-box, on straw, and laid the eggs expected of them.

8.

Summarise the pieces of The Earth.

Answer»

All that the Johnson had was the earth. Very often in seemed as if it were all they had even had.

It was true that they also had possessions-a plough, a two -wheeled cart, tools,abony brown mare which slowly dragged the plough and the cart about their rough four-acre plot-but without the earth these things were unless. I was true that they also had a son.

It was more than thirty years since the Johnons, realising that he was not quite like others, had taken Benjy to a doctor. This doctor had persuaded them that the needed interests that would stregthen his mind. It would be good if they gave him something to do, some occupation. which would help his development. It would help a great deal if they gave him a special interest to feed him sense of responsibility. You are people on the land, the doctor said, let him keep hens.

So for many years Benjy had kept hens, and what the earth was to his mother and father the hens were to Benjy. They were almost all he had. When he came from shcool, cut off by his simplicity from other children, Benjy went strainght home to his hens, which he kept in a wire coop that his father had made at the back of the house. At first he kept Ten or a dozen hens, all colours and breeds, brown and specked and black and white, and the coop was small. He fed the hens simply, on scraps from the table, seeded cabbages strung from the write, a little maize, and on corn ears which be gleaned in the late summer from his father is ocre of stubble. It is possible that a hen, being a simple creature thrives best on simple treatment. Benjy understood the first and last thing about a hen. That it exits for the became hightly complicated and commercialized. Eggs were cheap, hens mysteriously pecked Nourishment off the bore earth. They sat in a home-made Nesting-box, on straw, and laid the eggs expected of them.

Discussion

9.	A little boy named Salim on his way back
Answer» A little boy named salim found a crying puppy on the road on his way back from school and so brought it home. He washed the dog.Fed it food.Kept it's nickname as Jenny.He played with the dog all day long.He loves the dog so much that he used to sleep with the dog.And soon the dog too became very close to salim.Salim may forgot that he forgot to have food but this wasn't possible in case of his jenny. One day,when salim's parents were out for 2 days! in order to settle out a few more at their in-laws house! Salim was left all alone in the house along with his dog. On the same day when his parents left a thief entered his house.He was scared,he was worried,he can't decide what to do? He can't even shout because that thief had gun with him.Provided his shirt already have blood spots as if he came to his house just after murdering a human maybe because he was caught and to save himself to be caged by the police he killed that human!! well there's a lot of chaos going through his mind!! As soon as that angry,frowning ,thin thief came near to him with the gun in his hand and as soon as he was about to shoot the dog came and jumped over the thief and in the mean of time the boy called police and his neighbours! Hurray,the police arrived there soon and catch the thief and caged him in the jail.Everyone was fine but sadly that dog saved the life of Salim by taking shot on itself.

9.

A little boy named Salim on his way back

Answer»

A little boy named salim found a crying puppy on the road on his way back from school and so brought it home. He washed the dog.Fed it food.Kept it's nickname as Jenny.He played with the dog all day long.He loves the dog so much that he used to sleep with the dog.And soon the dog too became very close to salim.Salim may forgot that he forgot to have food but this wasn't possible in case of his jenny.

One day,when salim's parents were out for 2 days! in order to settle out a few more at their in-laws house! Salim was left all alone in the house along with his dog. On the same day when his parents left a thief entered his house.He was scared,he was worried,he can't decide what to do? He can't even shout because that thief had gun with him.Provided his shirt already have blood spots as if he came to his house just after murdering a human maybe because he was caught and to save himself to be caged by the police he killed that human!! well there's a lot of chaos going through his mind!! As soon as that angry,frowning ,thin thief came near to him with the gun in his hand and as soon as he was about to shoot the dog came and jumped over the thief and in the mean of time the boy called police and his neighbours! Hurray,the police arrived there soon and catch the thief and caged him in the jail.Everyone was fine but sadly that dog saved the life of Salim by taking shot on itself.

Discussion

10.	Write a brief note on Modern English.
Answer» Note on modern English: The modern age has emerged as era of development of science and technology combined with a deeprening sense of globalization.It is also true that English is being spoken by a large number of the world population. As such being a common language being spoekn in almost all countries it has also emerged as the language of trade and commerce, consequently, an individual needs to learn to communicate himself to others in no other language than English which could assure him a livelihood. hence one cannot do without English in the modern age as it has become as essential for survival amidst cutting competition as oxygen in for existence.

10.

Write a brief note on Modern English.

Answer»

Note on modern English:

The modern age has emerged as era of development of science and technology combined with a deeprening sense of globalization.It is also true that English is being spoken by a large number of the world population. As such being a common language being spoekn in almost all countries it has also emerged as the language of trade and commerce, consequently, an individual needs to learn to communicate himself to others in no other language than English which could assure him a livelihood. hence one cannot do without English in the modern age as it has become as essential for survival amidst cutting competition as oxygen in for existence.

Discussion

11.	Name the authors of the following books:(a) Tom Jones(b) In Memoriam(c) The Wasteland(d) Arm and the Man
Answer» (a) Henry Fildings. (b) William shakespear. (c) G.B. show. (d) E.M. Forster.

11.

Name the authors of the following books:(a) Tom Jones(b) In Memoriam(c) The Wasteland(d) Arm and the Man

Answer»

(a) Henry Fildings.

(b) William shakespear.

(c) G.B. show.

(d) E.M. Forster.

Discussion

12.	ComprehensionDirections: Read the given passage and answer the questions accordingly. Each question encases four options. Choose one appropriate option, out of four, for the correct answer.Time standing still is integral to the psychological phenomenon called 'flow'. Flow is a highly focused mental state associated with happiness, whereby people get carried along and become so absorbed in an activity that they don’t notice anything else, including the passage of time. This description matches my experience in the garden. Flow puts the process of active engagement center-stage, along with a blurring of the boundary between self and activity. The concept of flow might explain the attraction of the gardening experience, but it doesn’t tell us what draws people out into the garden in the first place, nor why so many end up hooked. Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next. This makes the garden intriguing and fascinating, switching our mindset on to the natural environment.1. Time warp.2. Pottering in the garden. 3. Engagement of concept flow on the centre stage.4. Gardening creates a time warp.
Answer» Correct Answer - Option 4 : Gardening creates a time warp. The correct answer is option 4) i.e. 'Gardening creates a time warp'. "Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next". The above lines refer to 'Gardening as a time bend activity' as it is able to make people pass their time. This is the basic fact explained in the entire passage. Hence, option 4).

12.

ComprehensionDirections: Read the given passage and answer the questions accordingly. Each question encases four options. Choose one appropriate option, out of four, for the correct answer.Time standing still is integral to the psychological phenomenon called 'flow'. Flow is a highly focused mental state associated with happiness, whereby people get carried along and become so absorbed in an activity that they don’t notice anything else, including the passage of time. This description matches my experience in the garden. Flow puts the process of active engagement center-stage, along with a blurring of the boundary between self and activity. The concept of flow might explain the attraction of the gardening experience, but it doesn’t tell us what draws people out into the garden in the first place, nor why so many end up hooked. Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next. This makes the garden intriguing and fascinating, switching our mindset on to the natural environment.1. Time warp.2. Pottering in the garden. 3. Engagement of concept flow on the centre stage.4. Gardening creates a time warp.

Answer» Correct Answer - Option 4 : Gardening creates a time warp.

The correct answer is option 4) i.e. 'Gardening creates a time warp'.

"Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next".
The above lines refer to 'Gardening as a time bend activity' as it is able to make people pass their time.
This is the basic fact explained in the entire passage.

Hence, option 4).

Discussion

13.	ComprehensionDirections: Read the given passage and answer the questions accordingly. Each question encases four options. Choose one appropriate option, out of four, for the correct answer.Time standing still is integral to the psychological phenomenon called 'flow'. Flow is a highly focused mental state associated with happiness, whereby people get carried along and become so absorbed in an activity that they don’t notice anything else, including the passage of time. This description matches my experience in the garden. Flow puts the process of active engagement center-stage, along with a blurring of the boundary between self and activity. The concept of flow might explain the attraction of the gardening experience, but it doesn’t tell us what draws people out into the garden in the first place, nor why so many end up hooked. Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next. This makes the garden intriguing and fascinating, switching our mindset on to the natural environment.1. Gardening makes people forget all and everything. 2. Gardening tempts people to see what might happen next.3. Flow is highly focused mental state. 4. The flow of 'gardening' as an activity is intriguing.
Answer» Correct Answer - Option 1 : Gardening makes people forget all and everything. The correct answer is option 1) i.e. 'Gardening makes people forget all and everything'. 'make people forget all and everything' as a context makes it clear in the lines given that 'active engagement blurs the boundary', make people forget even about themselves, which matches the context. Hence, option 1)

13.

ComprehensionDirections: Read the given passage and answer the questions accordingly. Each question encases four options. Choose one appropriate option, out of four, for the correct answer.Time standing still is integral to the psychological phenomenon called 'flow'. Flow is a highly focused mental state associated with happiness, whereby people get carried along and become so absorbed in an activity that they don’t notice anything else, including the passage of time. This description matches my experience in the garden. Flow puts the process of active engagement center-stage, along with a blurring of the boundary between self and activity. The concept of flow might explain the attraction of the gardening experience, but it doesn’t tell us what draws people out into the garden in the first place, nor why so many end up hooked. Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next. This makes the garden intriguing and fascinating, switching our mindset on to the natural environment.1. Gardening makes people forget all and everything. 2. Gardening tempts people to see what might happen next.3. Flow is highly focused mental state. 4. The flow of 'gardening' as an activity is intriguing.

Answer» Correct Answer - Option 1 : Gardening makes people forget all and everything.

The correct answer is option 1) i.e. 'Gardening makes people forget all and everything'.

'make people forget all and everything' as a context makes it clear in the lines given that 'active engagement blurs the boundary', make people forget even about themselves, which matches the context.

Hence, option 1)

Discussion

14.	ComprehensionDirections: Read the given passage and answer the questions accordingly. Each question encases four options. Choose one appropriate option, out of four, for the correct answer.Time standing still is integral to the psychological phenomenon called 'flow'. Flow is a highly focused mental state associated with happiness, whereby people get carried along and become so absorbed in an activity that they don’t notice anything else, including the passage of time. This description matches my experience in the garden. Flow puts the process of active engagement center-stage, along with a blurring of the boundary between self and activity. The concept of flow might explain the attraction of the gardening experience, but it doesn’t tell us what draws people out into the garden in the first place, nor why so many end up hooked. Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next. This makes the garden intriguing and fascinating, switching our mindset on to the natural environment.1. Possibility of the activity to explain 'concept flow'.2. Gardening tempts people. 3. Gardening creates a blur line. 4. Gardening is enjoyed by all.
Answer» Correct Answer - Option 4 : Gardening is enjoyed by all. The correct answer is option 4) i.e Gardening is enjoyed by all. Option is nowhere given in the passage. Hence, not true in the knowledge of the question. Hence, option 4)

14.

ComprehensionDirections: Read the given passage and answer the questions accordingly. Each question encases four options. Choose one appropriate option, out of four, for the correct answer.Time standing still is integral to the psychological phenomenon called 'flow'. Flow is a highly focused mental state associated with happiness, whereby people get carried along and become so absorbed in an activity that they don’t notice anything else, including the passage of time. This description matches my experience in the garden. Flow puts the process of active engagement center-stage, along with a blurring of the boundary between self and activity. The concept of flow might explain the attraction of the gardening experience, but it doesn’t tell us what draws people out into the garden in the first place, nor why so many end up hooked. Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next. This makes the garden intriguing and fascinating, switching our mindset on to the natural environment.1. Possibility of the activity to explain 'concept flow'.2. Gardening tempts people. 3. Gardening creates a blur line. 4. Gardening is enjoyed by all.

Answer» Correct Answer - Option 4 : Gardening is enjoyed by all.

The correct answer is option 4) i.e Gardening is enjoyed by all.

Option is nowhere given in the passage. Hence, not true in the knowledge of the question.

Hence, option 4)

Discussion

15.	ComprehensionDirections: Read the given passage and answer the questions accordingly. Each question encases four options. Choose one appropriate option, out of four, for the correct answer.Time standing still is integral to the psychological phenomenon called 'flow'. Flow is a highly focused mental state associated with happiness, whereby people get carried along and become so absorbed in an activity that they don’t notice anything else, including the passage of time. This description matches my experience in the garden. Flow puts the process of active engagement center-stage, along with a blurring of the boundary between self and activity. The concept of flow might explain the attraction of the gardening experience, but it doesn’t tell us what draws people out into the garden in the first place, nor why so many end up hooked. Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next. This makes the garden intriguing and fascinating, switching our mindset on to the natural environment.1. Dissipate2. Separate3. Vital4. substance
Answer» Correct Answer - Option 3 : Vital The correct answer is option 3) i.e. 'Vital'. Integral is something which 'Essential', 'Important', 'Vital'. Related: 'Fundamental', 'basic'. Hence, option 3)

15.

ComprehensionDirections: Read the given passage and answer the questions accordingly. Each question encases four options. Choose one appropriate option, out of four, for the correct answer.Time standing still is integral to the psychological phenomenon called 'flow'. Flow is a highly focused mental state associated with happiness, whereby people get carried along and become so absorbed in an activity that they don’t notice anything else, including the passage of time. This description matches my experience in the garden. Flow puts the process of active engagement center-stage, along with a blurring of the boundary between self and activity. The concept of flow might explain the attraction of the gardening experience, but it doesn’t tell us what draws people out into the garden in the first place, nor why so many end up hooked. Perhaps the garden itself has a role to play: tempting us out to see what might have happened in our absence and what needs doing next. This makes the garden intriguing and fascinating, switching our mindset on to the natural environment.1. Dissipate2. Separate3. Vital4. substance

Answer» Correct Answer - Option 3 : Vital

The correct answer is option 3) i.e. 'Vital'.

Integral is something which 'Essential', 'Important', 'Vital'.
Related: 'Fundamental', 'basic'.

Hence, option 3)

Discussion

16.	A triangular shaped wire carrying 10A current is placed in a uniform magnetic field of 0.5T, as shown in figure. The magnetic force on segment CD is (Given BC = CD = BD = 5 cm).(A) 0.126 N (B) 0.312 N (C) 0.216 N (D) 0.245 N
Answer» Correct option is (C) 0.216 N F_M (CD) = BI l_eff = 0.5 x (10) x (5 sin60 x 10^-2) = 0.216 N

16.

A triangular shaped wire carrying 10A current is placed in a uniform magnetic field of 0.5T, as shown in figure. The magnetic force on segment CD is (Given BC = CD = BD = 5 cm).(A) 0.126 N (B) 0.312 N (C) 0.216 N (D) 0.245 N

Answer»

Correct option is (C) 0.216 N

F_M (CD) = BI l_eff

= 0.5 x (10) x (5 sin60 x 10^-2)

= 0.216 N

Discussion

17.	An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? a. Doping b. Free electrons c. Thermal energy d. Valence electrons
Answer» (c) Thermal energy

Discussion

18.	Suppose an intrinsic semiconductor has 1 billion free electrons at room temperature. If the temperature changes to 75'C, how many holes are there? a. Fewer than 1 billion b. 1 billion c. More than 1 billion d. Impossible to say
Answer» (c) More than 1 billion

Discussion

19.	Two batteries of 24V and 20V with internal resistances of 0.4Ω and 0.25Ω respectively are connected in parallel across a load of 4Ω.Calculate(i) the current supplied by each battery and(ii) voltage across the load.
Answer» 8.1482A , -2.963A , 20.741V

19.

Two batteries of 24V and 20V with internal resistances of 0.4Ω and 0.25Ω respectively are connected in parallel across a load of 4Ω.Calculate(i) the current supplied by each battery and(ii) voltage across the load.

Answer»

8.1482A ,

-2.963A ,

20.741V

Discussion

20.	In TSEB, the base current must be very a. Small b. Large c. Unstable d. Stable
Answer» The correct answer is: (a) Small

Discussion

21.	The input impedance of a JFET a. Approaches zero b. Approaches one c. Approaches infinity d. Is impossible to predict
Answer» (c) Approaches infinity

Discussion

22.	The Q point of TSEB does not depend on the a. Emitter resistance b. Collector resistance c. Current gain d. Emitter voltage
Answer» (c) Current gain

Discussion

23.	A unipolar transistor uses a. Both free electrons and holes b. Only free electrons c. Only holes d. Either one or the other, but not both
Answer» (d) Either one or the other, but not both

Discussion

24.	The majority carriers in the emitter of a pnp transistor are a. Holes b. Free electrons c. Trivalent atoms d. Pentavalent atoms
Answer» The correct answer is: (a) Holes

Discussion

25.	The structure of houses in rural area is linked to the climatic conditions in which they are built. There is a village where houses have following features:Houses are made on strong bamboo pillars.Inside of houses is also made of wood.Houses are made almost 3 m to 3.5 m above the ground.Roofs are made with a slope.If in this village it rains heavily, the village should be part of1. Uttar Pradesh2. Rajasthan3. Bihar4. Assam
Answer» Correct Answer - Option 4 : Assam Explanation: In Assam state houses are - The houses are made up of strong bamboo pillars as bamboo are most available resource with their strong structure. The inside of house are made of wood which can be hold on bamboo bases. The most of the villages construct their wooden houses 3 to 3.5 m above the ground on strong bamboo pillars as floods are more often in this state. Since there is a heavy rain zone so their roofs are sloping that not store water on roof. Hence, we conclude from the above-mentioned points that in Assam is state which is suitable answer. Description of houses of different places: In Ladakh, houses are made of woods, with sloping roofs and covered in snow. In Kashmir, some old houses have a special type of window which comes out of the wall. It is called 'dab'. In villages of Kashmir, houses are made from stone cuts and kept one on top of the other and coated with mud. In Srinagar, 'Donga' houseboat can be seen in Dal Lake and Jhelum river. From inside it is just like a house with different rooms. In Manali (Himachal Pradesh), houses are made of stone and wood, but not on bamboo pillars.

25.

The structure of houses in rural area is linked to the climatic conditions in which they are built. There is a village where houses have following features:Houses are made on strong bamboo pillars.Inside of houses is also made of wood.Houses are made almost 3 m to 3.5 m above the ground.Roofs are made with a slope.If in this village it rains heavily, the village should be part of1. Uttar Pradesh2. Rajasthan3. Bihar4. Assam

Answer» Correct Answer - Option 4 : Assam

Explanation:

In Assam state houses are -

The houses are made up of strong bamboo pillars as bamboo are most available resource with their strong structure.
The inside of house are made of wood which can be hold on bamboo bases.
The most of the villages construct their wooden houses 3 to 3.5 m above the ground on strong bamboo pillars as floods are more often in this state.
Since there is a heavy rain zone so their roofs are sloping that not store water on roof.

Hence, we conclude from the above-mentioned points that in Assam is state which is suitable answer.

Description of houses of different places:

In Ladakh, houses are made of woods, with sloping roofs and covered in snow.
In Kashmir, some old houses have a special type of window which comes out of the wall. It is called 'dab'.
In villages of Kashmir, houses are made from stone cuts and kept one on top of the other and coated with mud.

In Srinagar, 'Donga' houseboat can be seen in Dal Lake and Jhelum river. From inside it is just like a house with different rooms.
In Manali (Himachal Pradesh), houses are made of stone and wood, but not on bamboo pillars.

Discussion

26.	A metal is illumimated by light of two different wavelength `248nm` and `310 nm` . The maximum speeds of the photoelectrons corresponding in these wavelength are `u_(1) and u_(2)` respectively . If the ratio `u_(1) : u_(2) = 2 : 1` and `hc = 1240 eVnm `, the work function of the meal is nearlyA. `3.7 eV`B. `3.2 eV`C. `2.8 eV`D. `2.8 eV`
Answer» Correct Answer - A `248 nm 1240//248 eV =5eV` `310 nm 1250//310 eV = 4eV` `(KE_(1))/(KE_(2))=(4)/(1) =(5ev-W)/(4ev-W)` `rArr 16-4 W =S-W rArr 11 = 3W` `rArr W = (11)/(3)=3.67 ev 3.7 ev`

Discussion

27.	For the reaction `SO_(2(g))+(1)/(2)O_(2(g))hArrSO_(3(g))`, if `K_(c)=K_(p)(RT)^(X)` then the value of `X` isA. `-1`B. `-(1)/(2)`C. `+(1)/(2)`D. `+1`
Answer» Correct Answer - C

Discussion

28.	When `20 g` of `CaCO_(3)` were put into `10 litre` flask and heated to `800^(@)C`, `35%` of `CaCO_(3)` remained unreacted at equilibrium. `K_(p)` for decomposition of `CaCO_(3)` is :A. `1.145 atm`B. `0.145 atm`C. `2.145 atm`D. `3.145 atm`
Answer» Correct Answer - A

Discussion

29.	In an atom 2K, 8L, 8M, 2N electrons are present If m = O, s = 1/2 then find no. of `e^(Θ)` :-A. 6B. 2C. 8D. 16
Answer» Correct Answer - A nos of `e^(-)` =2+8+8+2=20 `1s^(2)2s^(2)2p^(6) 3s^(2)3p^(6) 4s^(2)` m=0,s`=+(1)/(2) rArr` number of `e^(-)` = 6

Discussion

30.	Astringent in pharmacology
Answer» Drugs Acting On Skin And Mucous Membranes. Astringents are substances that precipitate proteins, but do not penetrate cells, thus affecting the superficial layer only. They toughen the surface making it mechanically stronger and decrease exudation.

Discussion

31.	Fluorine reacts with ice and results in the change :Justify that this reaction is a redox reaction.
Answer» In the given reaction O.N. of F₂ changes from zero to -1 in HF and HOF whereas O.N. of oxygen change from -2 in H₂O to zero in HOF. Thus, F₂ is reduced, whereas oxygen is oxidised and, therefore, it is a redox reaction.

31.

Fluorine reacts with ice and results in the change :Justify that this reaction is a redox reaction.

Answer»

In the given reaction O.N. of F₂ changes from zero to -1 in HF and HOF whereas O.N. of oxygen change from -2 in H₂O to zero in HOF.

Thus, F₂ is reduced, whereas oxygen is oxidised and, therefore, it is a redox reaction.

Discussion

32.	1. Is it possible to keep copper sulphate solution in zinc pot? Why? 2. Assign oxidation numbers of the underlined elements. (i) NaH2 PO4 (ii) NaHSO4
Answer» 1. No. Zn being more reactive will displace Cu from CuSO₄ . Thus Cu will be deposited on the vessel. 2. (i) NaH₂ PO₄ +1 +(+1 × 2) + x +(-2 × 4) = 0 1 + 2 + x – 8 = 0 x – 5 = 0 x = +5 (ii) NaHSO₄ +1 + 1 + x +(-2 × 4) = 0 +1 + 1 + x – 8 = 0 x – 6 = 0 x = +6

32.

1. Is it possible to keep copper sulphate solution in zinc pot? Why? 2. Assign oxidation numbers of the underlined elements. (i) NaH2 PO4 (ii) NaHSO4

Answer»

1. No. Zn being more reactive will displace Cu from CuSO₄ . Thus Cu will be deposited on the vessel.

2. (i) NaH₂ PO₄

+1 +(+1 × 2) + x +(-2 × 4) = 0

1 + 2 + x – 8 = 0

x – 5 = 0

x = +5

(ii) NaHSO₄

+1 + 1 + x +(-2 × 4) = 0

+1 + 1 + x – 8 = 0

x – 6 = 0

x = +6

Discussion

33.	Dihydrogen undergoes redox reactions with many metals at high temperature. (a) Write the reaction between hydrogen with sodium. (b) Comment, whether the product formed, is covalent compound or ionic compound. (c) Which is the reducing agent in this reaction?
Answer» 1. 2Na + H₂ → 2NaH 2. Ionic compound is formed. When alkali metals react with hydrogen ionic hydrides are formed. 3. Na is the reducing agent.

33.

Dihydrogen undergoes redox reactions with many metals at high temperature. (a) Write the reaction between hydrogen with sodium. (b) Comment, whether the product formed, is covalent compound or ionic compound. (c) Which is the reducing agent in this reaction?

Answer»

1. 2Na + H₂ → 2NaH

2. Ionic compound is formed. When alkali metals react with hydrogen ionic hydrides are formed.

3. Na is the reducing agent.

Discussion

34.	The conditions preferred by some plants are shown in the table below:PlantApplePotatoBlack currantMintOnionStrawberryLettucepH5.0-6.54.5-6.06.0-8.07.0-8.06.0-7.05.0-7.06.0-7.0 (a) Which plants grow well over the largest range of pH values?(b) Which plant can grow in the most acidic soil?(c) Which plant can grow in the basic soil only?(d) What is the pH range for onion to grow well?
Answer» (a) Black currant and strawberry (b) Potato (4.5 - 6.0) (c) Mint (7.0 - 8.0) (d) 6.0-7.0

Discussion

35.	Main ore of lead is gaalena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead. (i)First method involves the roasting of ore followed by reduction with coke or CO. (ii)Second method involves the partial roasting of ore followed by self reduction. Which of the following statement is incorrect about the extraction of lead from galena ?A. Galena is a sulphide ore and therefore , it is concentrated by froth flotation processB. Self reduction takes place in absence of airC. Complete roasting of galena gives PbO which is then reduced by coke or CO to give metallic leadD. `FeSiO_3` is obtained as slag.
Answer» Correct Answer - D `FeSiO_3` is obtained as slag in the extraction of copper from copper pyrites.

Discussion

36.	Metallic gold is frequently found in aluminosllicate rocks and it is finely dispersed among other minerals.It may be extracted by treating the crushed rock with aerated potassium cyanide solution.During this process metallic gold is slowly converted to `[An(CN)_2]^(-)` , which is soluble in water.After equilibrium has been reached.the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to `[Zn(CN)_4]^(2-)`. Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution.Silver occurs as native as well as sulphurised ore. Which of the following statements is correct ?A. Leaching of gold with `CN^-` is an oxidation reductionB. Argentite is oxide ore of silverC. In the precipitation of gold from the soluble complex, zinc acts as complexing and reducing agentD. (A) and (C ) both
Answer» Correct Answer - D Au `to [Au^+]` which then from complex with `CN^(-)` `2[Au(CN)_2]+Znto 2Audarr+[Zn(CN)_4]^(3-)`Zinc acts both as complexing and reducing reagent.

Discussion

37.	Metallic gold is frequently found in aluminosllicate rocks and it is finely dispersed among other minerals.It may be extracted by treating the crushed rock with aerated potassium cyanide solution.During this process metallic gold is slowly converted to `[An(CN)_2]^(-)` , which is soluble in water.After equilibrium has been reached.the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to `[Zn(CN)_4]^(2-)`. Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution.Silver occurs as native as well as sulphurised ore. The process described above in the passage is regarding :A. ore dressingB. pyrometallurgical extractionC. hydrometallurgical extractionD. purification of metal
Answer» Correct Answer - C The process which involves the dissolution of ore into a suitable reagent and then extraction of metal from the solution by more electropositive elements is called hydrometallurgy .

Discussion

38.	Minerals from which metals can be extracted economically and easily are called ores.The extraction of metals from theirs ores involves the following processes. (i)Concentration. (ii)Calcination \| roasting \| leaching . (iii)Reduction. It is carried out be one of the following methods. Silver is extracted from its native ore by :A. Formation of soluble complex by dilute solution of NaCN in presence of air followed by the reduction with zincB. Formation of soluble complex by dilute solution of NaCN in absence of air followed by the reduction with zincC. Roasting followed by the self reductionD. Roasting followed by electrolytic reduction
Answer» Correct Answer - A `O_2` oxidases silver to silver (I) ion which then prouduce soluble complex with `CN^(-)` ions . `2Ag+4NaCN+1/2 O_2 +H_2O hArr 2Na[Ag (CN)_2]+2NaOH`. `2Na[Ag (CN)_2]+ZntoNa_2[Zn(CN)_4]+ZntoNa_2[Zn(CN)_4]+Agdarr`

Discussion

39.	Minerals from which metals can be extracted economically and easily are called ores.The extraction of metals from theirs ores involves the following processes. (i)Concentration. (ii)Calcination \| roasting \| leaching . (iii)Reduction. It is carried out be one of the following methods. Which of the following reactions reactions does not occur in Bessemer converter in the extraction of copper from chalcopyrites ?A. `2Cu FeS_2+4O_2toCu_2S+2FeO+3SO_2`B. `FeO+SiO_2toFeSiO_3`C. `2FeS+3O_2to2FeO+2SO_2`D. `Cu_2S+2Cu_2Oto6Cu+SO_2`
Answer» Correct Answer - A The reaction occurs during roasting in reverberatory furnace at moderate temperature in presence of air.

Discussion

40.

Give the Classification of Bronsted - Lowery Acids and Bases.

Answer»

Classification of Bronsted - Lowery Acids and Bases :

Bronsted - Lowery acids and bases can be

(i) Molecular (ii) Cationic and (iii) Anionic

Type	Acid	Base
Molecular	HCl, HNO₃ , HClO₄, H₂SO₄, H₃ PO₄, H₂O etc.	NH₃ , N₂H₄, Amines, H₂O, Alcohol, Ethers etc.
Cationic	NH₄⁺ , N₂H₅⁺ , PH₄⁺ ,Na⁺ , Ba²⁺ (All cations) [Fe(H₂O)₆]³⁺, [Al(H₂O)₆]³⁺ etc.	[Fe(H₂O)₅OH]²⁺ [Al(H₂O)₅ OH]²⁺ etc.
Anionic	HS^– , HSO₃^– , H₂PO₄^– ,HS₄^– HCO₃^– , HPO₄ ^2– etc. all amphiprotic anions	Cl^– , Br^– , OH^– , HSO₄^– , CN^– , CO₃^2–,SO₄^2–, NH₂^– , CH₃ COO^– etc. all amphiprotic anions

Discussion

41.	Which of the following salts will give basic solution on hydrolysis ?A. `NH_(4)Cl`B. KCIC. `K_(2)CO_(3)`D. `(NH_(4))_(2)CO_(3)`
Answer» Correct Answer - C `K_(2)CO_(3)+2H_(2)OhArrH_(2)CO_(3)` weak acid strong base

Discussion

42.	In which of the following solvents silver chloride easily soluble ?A. `0.1(mol)/(dm^(3))AgNO_(3)` solutionB. `0.1(mol)/(dm^(3))HCI` solutionC. `H_(2)`limiting reagentD. `Aqueous NH_(3)`
Answer» Correct Answer - D `AgCI+2NH_(3)to[Ag[NH_(3)]_(2)]CI`

Discussion

43.	pH of `10^(-6) M HI(aq.)` is :-A. just less than 6B. exactly equal to 6C. just greater than 6D. just less than 7
Answer» Correct Answer - A total `[H^(+)]=10^(-6)+10^(-7) ` =`10^(-7)[10+1]` ` pH=-log(11xx10^(-7))` pH=5.98

Discussion

44.	(i) Calculate the total number of electrons present in 1 mole of methane . (ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of `.^(14) C`. (Assume that mass of a neutron ` = 1 . 6 75 xx 10 ^(-27) g)` (iii) Find (a) the total mnumber of protons and (b) the total mass fo protons in ` 32 mg` of ` NH_3` at ` STP`. ( mass of proton ` = 1 . 6 72 xx 10^(-27) g)` Will the answer change if the temperature and pressure are changed ?
Answer» a. `1` molecule of methane contains electrons `=6+4=10` `6.022xx10^(23)` molecules `(1 "mole")` of methnane contain electron `=6.022xx10^(23)xx10=6.022xx10^(24)` b. a. `14 g` of carbon has `6.022xx10^(23)` neutrons `7xx10^(-3) g` of carbon has `=(6.022xx10^(23)xx7xx10^(-3))/(14)=3.011xx10^(20)` b. Mass of `1` neturon `=1.675xx10^(-27) kg` Mass of `3.011xx10^(20)` neutrons `=1.675xx10^(-27)xx3.011xx10^(20)kg` `=5.04xx10^(-7) kg` c. i. `17 g` of `NH_(3)` has `6.022xx10^(23)` protons `34xx10^(-3)g` of `NH_(3)` have `(6.022xx10^(23)xx34xx10^(-3))/(17)` protons `=12.044xx10^(20)` `=1.2044xx10^(21)` ii. Mass of `1` proton `=1.67xx10^(-27) kg` Mass of `1.2044xx10^(20)` protons `=1.2044xx10^(20)xx1.67xx10^(-27)` `=2.01xx10^(-7) kg`

Discussion

45.	The pH of blood stream is maintained by a proper balance of `H_(2)CO_(3)` and `NaHCO_(3)` concentration. What volume of 5 M `NaHCO_(3)` solution should be mixed with a 10 mL sample of blood which is 2 M in `H_(2)CO_(3)` in order to maintain its pH ? `[pk_(a)" for "H_(2)CO_(3)=6.1][10^(1.3)=19.9]`A. 40 mLB. 38 mLC. 50 mLD. 79 mL
Answer» Correct Answer - D `pH=pK_(a)+log.((HCO_(3)^-))/((H_(2)CO_(3)))` Let V mL of `NaHCO_(3)` is required moles of `H_(2)CO_(3)` `=2xx0.01=0.02` Let V mL of `NaHCO_(3)` is required moles of `Na_(2)CO_(3)` `=5xxV=5V` ltBrgt `thereforepH=pKa+log((5V)/(0.02))` 7.4=6.1+log`((5V)/(0.02))` ltBrgt `rArr v=79ml`

Discussion

46.	How much water must be added to 300mL of 0.2M solution of `CH_(3)COOHKa=1.8xx10^(-5)` for the degree of dissociation to double ?A. 600mlB. 900mlC. 1200mlD. 1500ml
Answer» Correct Answer - B `alphasqrt(v)`

Discussion

47.	`H_(2)CO_(3)+NaHCO_(3)` found in blood helps in maintaining pH of the blood close to 7.4. An excess of acid entering the blood stream is removed by:A. `HCO_(3)^(-)`B. `H_(2)CO_(3)`C. `H^(+)`D. `CO_(3)^(2-)`
Answer» Correct Answer - A Excess of acid entering the blood stream will react with `HCO_(3)^(-)` to produce `H_(2)CO_(3)` and this newly produced `H_(2)CO_(3)` will not further dissociate due to common ion effect.

Discussion

48.	Selenious acid `(H_(2)SeO_(3))`,a diprotoc acid has `Ka_(1)=10^(-6)` and `Ka_(2)=10^(-8)` respectively. Appoximate pH of 0.01M `NaHSeO_(3)` is given by :-A. `pH=7+(pKa_(1))/(2)+(logC)/(2)`B. `pH=7-(pKa_(1))/(2)-(logC)/(2)`C. `pH = (pKa_(1)+pKa_(2))/(2)`D. `pH=7+(pKa_(1))/(2)-(pKa_(2))/(2)`
Answer» Correct Answer - C `H2SeO_(3)overset(Ka_(1))hArroverset("Amphiprotic acid")overset(uarr)(HSeO_(3)^(-))overset(Ka_(2))hArrSeO_(3)^(2-)` `Ka_(1)=([HSeO_(3)^(-)][H^(+)])/([H_(2)SeO_(3)]),Ka_(2)=([SeO_(3)^(2-)][H^(+)])/([H_(2)seO_(3)])` `Ka_(1)xxKa_(2)=[H^(+)]^(2)xx([SeO_(3)^(2-)])` ....(1) At isoelectric point `[SeO_(3)^(2-)]~~[H_(2)SeO_(3)]` then from (1) `Ka_(1)xxKa_(2)=[H^(+)]^(2)` `rArr[H^(=)]=(Ka_(1)xxKa_(2))^(1//2)` `becausepH-log(Ka_(1)xxKa_(2))^(1//2)` `rArrpH=(1)/(2)(pKa_(1)+pKa_(2))`

Discussion

49.	`pK_(a)` of `NH_(4)^(+)` is 9.26. Hence, effective range for `NH_(4)OH-NH_(4)Cl` buffer is about pH:A. 8 .26 to 10 .26B. 4.74 to 5.74C. 3.74 to 5.74D. 8.26 to 9.26
Answer» Correct Answer - A `pK_(a)+pK_(b)=pK_(w)` `pOH=pK_(b)pm1` `pH=14-pOH`

Discussion

50.	Which of the following would increase the solubility of `Pb(OH)_(2)`?A. Add HCI solutionB. Add `Pb(NO_(3))_(2)` solutionC. Add NaOH solutionD. Solubility depends on temperature only
Answer» Correct Answer - A due to odd ion effect

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Name the authors of the following : (a) David Copperfield (b) Emma (c) Piers the Plowman

Name the authors of the following works:(a) The Merchant of Venice(b) The Gitanjali.

Complete the following sentences on the basis of your textual reading :(a) This means that cheap daily,paper which goes everywhere and has the most ...........(b) India has always been part of my .......... in my life.

I’ve spent _____ money this week! I don’t know where it’s all gone. A) such B) so many C) so much D) so

I don’t know her well, but I’ve met her ________ times. A) plenty B) another C) severalD) more

Write a brief note on the Indian English.

Summarise the pieces of The Earth.

A little boy named Salim on his way back

Write a brief note on Modern English.

Name the authors of the following books:(a) Tom Jones(b) In Memoriam(c) The Wasteland(d) Arm and the Man

A triangular shaped wire carrying 10A current is placed in a uniform magnetic field of 0.5T, as shown in figure. The magnetic force on segment CD is (Given BC = CD = BD = 5 cm).(A) 0.126 N (B) 0.312 N (C) 0.216 N (D) 0.245 N

An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? a. Doping b. Free electrons c. Thermal energy d. Valence electrons

Suppose an intrinsic semiconductor has 1 billion free electrons at room temperature. If the temperature changes to 75'C, how many holes are there? a. Fewer than 1 billion b. 1 billion c. More than 1 billion d. Impossible to say

Two batteries of 24V and 20V with internal resistances of 0.4Ω and 0.25Ω respectively are connected in parallel across a load of 4Ω.Calculate(i) the current supplied by each battery and(ii) voltage across the load.

In TSEB, the base current must be very a. Small b. Large c. Unstable d. Stable

The input impedance of a JFET a. Approaches zero b. Approaches one c. Approaches infinity d. Is impossible to predict

The Q point of TSEB does not depend on the a. Emitter resistance b. Collector resistance c. Current gain d. Emitter voltage

A unipolar transistor uses a. Both free electrons and holes b. Only free electrons c. Only holes d. Either one or the other, but not both

The majority carriers in the emitter of a pnp transistor are a. Holes b. Free electrons c. Trivalent atoms d. Pentavalent atoms

For the reaction `SO_(2(g))+(1)/(2)O_(2(g))hArrSO_(3(g))`, if `K_(c)=K_(p)(RT)^(X)` then the value of `X` isA. `-1`B. `-(1)/(2)`C. `+(1)/(2)`D. `+1`

When `20 g` of `CaCO_(3)` were put into `10 litre` flask and heated to `800^(@)C`, `35%` of `CaCO_(3)` remained unreacted at equilibrium. `K_(p)` for decomposition of `CaCO_(3)` is :A. `1.145 atm`B. `0.145 atm`C. `2.145 atm`D. `3.145 atm`

In an atom 2K, 8L, 8M, 2N electrons are present If m = O, s = 1/2 then find no. of `e^(Θ)` :-A. 6B. 2C. 8D. 16

Astringent in pharmacology

Fluorine reacts with ice and results in the change :Justify that this reaction is a redox reaction.

1. Is it possible to keep copper sulphate solution in zinc pot? Why? 2. Assign oxidation numbers of the underlined elements. (i) NaH2 PO4 (ii) NaHSO4

Dihydrogen undergoes redox reactions with many metals at high temperature. (a) Write the reaction between hydrogen with sodium. (b) Comment, whether the product formed, is covalent compound or ionic compound. (c) Which is the reducing agent in this reaction?

Give the Classification of Bronsted - Lowery Acids and Bases.

Which of the following salts will give basic solution on hydrolysis ?A. `NH_(4)Cl`B. KCIC. `K_(2)CO_(3)`D. `(NH_(4))_(2)CO_(3)`

In which of the following solvents silver chloride easily soluble ?A. `0.1(mol)/(dm^(3))AgNO_(3)` solutionB. `0.1(mol)/(dm^(3))HCI` solutionC. `H_(2)`limiting reagentD. `Aqueous NH_(3)`

pH of `10^(-6) M HI(aq.)` is :-A. just less than 6B. exactly equal to 6C. just greater than 6D. just less than 7

How much water must be added to 300mL of 0.2M solution of `CH_(3)COOHKa=1.8xx10^(-5)` for the degree of dissociation to double ?A. 600mlB. 900mlC. 1200mlD. 1500ml

`H_(2)CO_(3)+NaHCO_(3)` found in blood helps in maintaining pH of the blood close to 7.4. An excess of acid entering the blood stream is removed by:A. `HCO_(3)^(-)`B. `H_(2)CO_(3)`C. `H^(+)`D. `CO_(3)^(2-)`

Selenious acid `(H_(2)SeO_(3))`,a diprotoc acid has `Ka_(1)=10^(-6)` and `Ka_(2)=10^(-8)` respectively. Appoximate pH of 0.01M `NaHSeO_(3)` is given by :-A. `pH=7+(pKa_(1))/(2)+(logC)/(2)`B. `pH=7-(pKa_(1))/(2)-(logC)/(2)`C. `pH = (pKa_(1)+pKa_(2))/(2)`D. `pH=7+(pKa_(1))/(2)-(pKa_(2))/(2)`

`pK_(a)` of `NH_(4)^(+)` is 9.26. Hence, effective range for `NH_(4)OH-NH_(4)Cl` buffer is about pH:A. 8 .26 to 10 .26B. 4.74 to 5.74C. 3.74 to 5.74D. 8.26 to 9.26

Which of the following would increase the solubility of `Pb(OH)_(2)`?A. Add HCI solutionB. Add `Pb(NO_(3))_(2)` solutionC. Add NaOH solutionD. Solubility depends on temperature only