125876 + Interview Questions in General QA

1.	Use Hund’s rule to derive the electronic configuration of Ce3+ ion, and calculate its magnetic moment on the basis of ‘spin- only’ formula.
Answer» Ce : 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² sp⁶ 4f¹ 5d¹ 6s² Ce : [Xe] 4f¹ 5d¹ 6s² Ce³⁺: {Xe} 4f¹ For Ce³⁺: Number of unpaire electrons = n = 1 µ = \(\sqrt{n(n + 2)}\) = \(\sqrt8\) = \(2\sqrt2\) = 2.828 BM.

1.

Use Hund’s rule to derive the electronic configuration of Ce3+ ion, and calculate its magnetic moment on the basis of ‘spin- only’ formula.

Answer»

Ce : 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² sp⁶ 4f¹ 5d¹ 6s²
Ce : [Xe] 4f¹ 5d¹ 6s²
Ce³⁺: {Xe} 4f¹
For Ce³⁺:
Number of unpaire electrons = n = 1

µ = \(\sqrt{n(n + 2)}\)

= \(\sqrt8\)

= \(2\sqrt2\)

= 2.828 BM.

Discussion

2.	Calculate the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25.
Answer» With atomic number 25, the divalent ion in aqueous solution will have d⁵ configuration (five unpaired electrons). The magnetic moment, is 5.92 BM

Discussion

3.	Comment on the following: (i) Zr and Hf have similar sizes(ii) Actinones show greater no. of oxidation state than Lanthanones.
Answer» (i) As a consequence of Lanthanoid contraction Zr and Hf have similar sizes. (ii) As energies of 5f, 6d and 7s are comparable therefore electrons can easily be promoted from lower to higher orbital, hence more no. of oxidation states are shown. Another reason is that the 5f electrons are available for bonding unlike 4f in lanthanides.

3.

Comment on the following: (i) Zr and Hf have similar sizes(ii) Actinones show greater no. of oxidation state than Lanthanones.

Answer»

(i) As a consequence of Lanthanoid contraction Zr and Hf have similar sizes.

(ii) As energies of 5f, 6d and 7s are comparable therefore electrons can easily be promoted from lower to higher orbital, hence more no. of oxidation states are shown. Another reason is that the 5f electrons are available for bonding unlike 4f in lanthanides.

Discussion

4.	Give reasons for the following:(i) Fe has higher melting point than Cu.(ii) [Ti (H2O)6]3+ is coloured while [Sc(H2O)6] 3+ is colourless.
Answer» (i) This is because Fe (3d⁶ 4s² ) has four unpaired electrons in 3d-subshell. While Cu (3d¹⁰, 4s¹) only one unpaired electron in 4s shell. Hence metallic bonding is stronger in Fe than those in Cu. (ii) The oxidation state of Ti in [Ti (H₂O)₆] ³⁺ is +3 and its configuration is [Ar] 3d¹ i.e one unpaired electron and hence it is coloured. Whereas the oxidation state of Sc in [Sc (H₂O)₆]³⁺ is +3 and its configuration is [Ar] 3d⁰ i.e no unpaired electron and hence it is colourless.

4.

Give reasons for the following:(i) Fe has higher melting point than Cu.(ii) [Ti (H2O)6]3+ is coloured while [Sc(H2O)6] 3+ is colourless.

Answer»

(i) This is because Fe (3d⁶ 4s² ) has four unpaired electrons in 3d-subshell. While Cu (3d¹⁰, 4s¹) only one unpaired electron in 4s shell. Hence metallic bonding is stronger in Fe than those in Cu.

(ii) The oxidation state of Ti in [Ti (H₂O)₆] ³⁺ is +3 and its configuration is [Ar] 3d¹ i.e one unpaired electron and hence it is coloured. Whereas the oxidation state of Sc in [Sc (H₂O)₆]³⁺ is +3 and its configuration is [Ar] 3d⁰ i.e no unpaired electron and hence it is colourless.

Discussion

5.	In which case a consumer cannot complain against the manufacturer for a defective product?(a) Date of expiry unspecified (b) Price of the commodity (c) Batch number of the commodity (d) Address of the manufacturer
Answer» (c) Batch number of the commodity

Discussion

6.	Consumer’s face various problems from the producer’s end due to (a) Unfair trade practices (b) Wide range of goods (c) Standard quality goods (d) Volume of production
Answer» (a) Unfair trade practices

Discussion

7.	Consumers must be provided with adequate information about a product to make(a) Investment in production(b) Decision in sale of goods(c) Credit purchase of goods(d) Decision in purchase of goods
Answer» (d) Decision in purchase of goods

Discussion

8.	Describe consumer protection.
Answer» Consumer protection is a group of laws enacted to protect the rights of consumers, fair trade, competition and accurate information in the market place.

Discussion

9.	Tick the appropriate answer:Assertion: In local Markets the buyers and sellers are limited to the local region or are Reason: A market is not restricted to one physical or geographical location.(a) Both, A and R, are true and R is the correct explanation of A (b) Both, A and R, are true but R is not the correct explanation of A(c) If A is true but R is false (d) If A is false but R is true
Answer» (b) Both, A and R, are true but R is not the correct explanation of A

Discussion

10.

Match the followingThe Consumer Protection Act1955The Legal Metrology Act1986The Bureau of Indian Standards Act2009The Essential Commodities Act1986

Answer»

The Consumer Protection Act	1986
The Legal Metrology Act	2009
The Bureau of Indian Standards Act	1986
The Essential Commodities Act	1955

Discussion

11.	The system of consumer courts at the national, state, and district levels, looking into consumers grievances against unfair trade practices of businessmen and providing necessary compensation, is called(a) Three tier system (b) One tier system (c) Two tier system (d) Four tier system
Answer» (a) Three tier system

Discussion

12.	Fill in the blanks1. A set up where two or more parties engage in ........ of goods, service and information is called a market.2. In regulated Markets, there is some oversight by appropriate ........... authoriries3. ........... refers to a market structure in which there is a single producer or seller that has a control on the entire market.4. ........... statue is regarded as the ‘Magna Carta in the field of consumer protection for checking unfair trade practices.
Answer» 1. exchange 2. Government 3. Monopoly 4. COPRA

12.

Fill in the blanks1. A set up where two or more parties engage in ........ of goods, service and information is called a market.2. In regulated Markets, there is some oversight by appropriate ........... authoriries3. ........... refers to a market structure in which there is a single producer or seller that has a control on the entire market.4. ........... statue is regarded as the ‘Magna Carta in the field of consumer protection for checking unfair trade practices.

Answer»

1. exchange

2. Government

3. Monopoly

4. COPRA

Discussion

13.	Mixing other extraneous material of inferior quality with a superior quality material is called (a) Purification(b) Adulteration(c) Refinement(d) Alteration
Answer» (b) Adulteration

Discussion

14.	Insecticide obtained from neem plant is(a) pyrethrin (b) pyrethroid (c) thiocarbamate (d) azadirachtin
Answer» (d) azadirachtin

Discussion

15.	State disadvantages of friction.
Answer» Disadvantages of friction : 1. Friction opposes motion. 2. Friction produces heat in different parts of machines. It also produces noise. 3. Automobile engines consume more fuel due to friction.

15.

State disadvantages of friction.

Answer»

Disadvantages of friction :

1. Friction opposes motion.

2. Friction produces heat in different parts of machines. It also produces noise.

3. Automobile engines consume more fuel due to friction.

Discussion

16.	If two temperatures differ by 25°C on Celsius scale, the difference in temperature on Fahrenheit scale is (A) 65° (B) 45° (C) 38° (D) 25°
Answer» Correct answer is (B) 45°

Discussion

17.

A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time −(i) the length of the shadow cast by another pole 10 m 50 cm high(ii) the height of a pole which casts a shadow 5 m long.

Answer»

(i) Let the length of the shadow of the other pole be x m. 1 m = 100 cm

The given information in the form of a table is as follows.

Height of pole (in m)	5.60	10.50
Length of shadow (in m)	3.20	x

More the height of an object, more will be the length of its shadow.

Thus, the height of an object and length of its shadow are directly proportional to each other. Therefore, we obtain

5.60/3.20 = 10.50/x

x = (10.50 x 3.20)/5.60 = 6

Hence, the length of the shadow will be 6 m.

(ii) Let the height of the pole be y m.

The given information in the form of a table is as follows.

Height of pole (in m)	5.60	y
Length of shadow (in m)	3.20	5

The height of the pole and the length of the shadow are directly proportional to each other. Therefore,

5.60/3.20 = y/5

y = (5 x 5.60)/3.20 = 8.75

Thus, the height of the pole is 8.75 m or 8 m 75 cm.

Discussion

18.

In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?

Answer»

Let the length of the mast of the model ship be x cm.

The given information in the form of a table is as follows:

--	Height of mast	Length of ship
Model ship	9 cm	x
Actual ship	12 m	28 m

We know that the dimensions of the actual ship and the model ship are directly

proportional to each other.

Therefore, we obtain:

19/2 = 28/x

x = (28 x 9)/12 = 12

Thus, the length of the model ship is 21 cm.

Discussion

19.	In a ship of length 28 m, height of its mast is 12 m. If the height of the mast in its model is 9 cm what is the length of the model ship?
Answer» The length of ship and the height of its mast are in direct proportion. ⇒ \(\frac{x_1}{y_1}= \frac{x_2}{y_2}\) , x₁ = 28 ,y₁ = 12 , x₂ = ? , y₂ = 9 ⇒ x₂ = \(\frac{x_1\,\times\,y_2}{y_1}\) = \(\frac{28\,\times\,9}{12}\) x₂= 7 × 3 = 21 ∴ The length of model ship = 21 m

19.

In a ship of length 28 m, height of its mast is 12 m. If the height of the mast in its model is 9 cm what is the length of the model ship?

Answer»

The length of ship and the height of its mast are in direct proportion.

⇒ \(\frac{x_1}{y_1}= \frac{x_2}{y_2}\) , x₁ = 28 ,y₁ = 12 , x₂ = ? , y₂ = 9

⇒ x₂ = \(\frac{x_1\,\times\,y_2}{y_1}\) = \(\frac{28\,\times\,9}{12}\)

x₂= 7 × 3 = 21

∴ The length of model ship = 21 m

Discussion

20.	Do you think the words ‘lept’ and ‘lep’ in the third stanza are spelt correctly ? Why does the poet spell them like this ?
Answer» No, the words ‘lept’ and ‘lep’ are spelt incorrectly. The poet has spelled them like this in order to maintain the rhythm of the poem. When spelled this way, they rhyme with the first part of ‘leopard’, thus giving emphasis to ‘leopard’ in each line.

Discussion

21.	Read the following extract carefully and answer the questions that follow:"The true Chameleon is small A lizard sort of thing;He hasn’t any ears at all,And not a single wing.If there is nothing on the tree,’Tis the chameleon you see."1. How is the chameleon described in this stanza?(i) A chameleon is small reptile without wings or ears.(ii) A chameleon is large reptile without wings or ears.(iii) A chameleon is small mammal without wings or ears.(iv) A chameleon is small reptile with wings and ears. 2. Which 'sort of thing' is a chameleon?(i) A snake sort of thing.(ii) A lizard sort of thing.(iii) A rat sort of thing.(iv) A bird sort of thing.3. Write the rhyme scheme and rhyming words of the stanza.(i) Rhyme scheme is ababbb. The rhyming words are small-all, thing-wing, tree-see.(ii) Rhyme scheme is ababcc. The rhyming words are small-all, thing-wing, tree-see.(iii) Rhyme scheme is abbacc. The rhyming words are thing-all, small -wing, tree-see.(iv) Rhyme scheme is aabbcc. The rhyming words are small-all, thing-see, tree-wing.4. Give an example for alliteration from the above lines.(i) the tree(ii) at all(iii) he hasn’t(iv) you see5. Give an example of consonance from the above lines.(i) the true chameleon (ii) any ears(iii) you see(iv) single wing
Answer» 1. (i) A chameleon is small reptile without wings or ears. 2. (ii) A lizard sort of thing. 3. (iii) Rhyme scheme is ababcc. The rhyming words are small-all, thing-wing, tree-see. 4. (iii) he hasn’t 5. (iv) single wing

21.

Read the following extract carefully and answer the questions that follow:"The true Chameleon is small A lizard sort of thing;He hasn’t any ears at all,And not a single wing.If there is nothing on the tree,’Tis the chameleon you see."1. How is the chameleon described in this stanza?(i) A chameleon is small reptile without wings or ears.(ii) A chameleon is large reptile without wings or ears.(iii) A chameleon is small mammal without wings or ears.(iv) A chameleon is small reptile with wings and ears. 2. Which 'sort of thing' is a chameleon?(i) A snake sort of thing.(ii) A lizard sort of thing.(iii) A rat sort of thing.(iv) A bird sort of thing.3. Write the rhyme scheme and rhyming words of the stanza.(i) Rhyme scheme is ababbb. The rhyming words are small-all, thing-wing, tree-see.(ii) Rhyme scheme is ababcc. The rhyming words are small-all, thing-wing, tree-see.(iii) Rhyme scheme is abbacc. The rhyming words are thing-all, small -wing, tree-see.(iv) Rhyme scheme is aabbcc. The rhyming words are small-all, thing-see, tree-wing.4. Give an example for alliteration from the above lines.(i) the tree(ii) at all(iii) he hasn’t(iv) you see5. Give an example of consonance from the above lines.(i) the true chameleon (ii) any ears(iii) you see(iv) single wing

Answer»

1. (i) A chameleon is small reptile without wings or ears.

2. (ii) A lizard sort of thing.

3. (iii) Rhyme scheme is ababcc. The rhyming words are small-all, thing-wing, tree-see.

4. (iii) he hasn’t

5. (iv) single wing

Discussion

22.	Read the following extracts and answer the questions that follow:What is the boy now, who has lost his ball,What, what is he to do? I saw it goMerrily bouncing, down the street, and thenMerrily over — there it is in the water!1. Why is the boy sad? (i) The boy was sad because he lost his ball. (ii) The boy was sad because the poet took his ball. (iii) The boy was sad because someone made him cry. (iv) The boy is sad because he had no friends to play.2. Where is the ball? (i) The ball bounced in the ground and went into the house. (ii) The ball bounced down the street and went into the sewage.(iii) The ball bounced down the street and went to the water.(iv) The ball bounced in the ground and went down the streets.3. What is the poet talking about?(i) The boy who is happy always. (ii) The boy who lost the ball. (iii) The ball rolling into the streets.(iv) The ball that was stolen from the boy.4. "Merrily" is mentioned for?(i) Boy(ii) Water(iii) Street(iv) Ball5. What does "Merrily" mean?(i) Angrily(ii) Ucontrollably(iii) Happily(iv) Sadly
Answer» 1. (i) The boy was sad because he lost his ball. 2. (ii)The ball bounced down the street and went to the water. 3. (iii)The boy who lost the ball. 4. (iv) Hall 5. (iii) Happily

22.

Read the following extracts and answer the questions that follow:What is the boy now, who has lost his ball,What, what is he to do? I saw it goMerrily bouncing, down the street, and thenMerrily over — there it is in the water!1. Why is the boy sad? (i) The boy was sad because he lost his ball. (ii) The boy was sad because the poet took his ball. (iii) The boy was sad because someone made him cry. (iv) The boy is sad because he had no friends to play.2. Where is the ball? (i) The ball bounced in the ground and went into the house. (ii) The ball bounced down the street and went into the sewage.(iii) The ball bounced down the street and went to the water.(iv) The ball bounced in the ground and went down the streets.3. What is the poet talking about?(i) The boy who is happy always. (ii) The boy who lost the ball. (iii) The ball rolling into the streets.(iv) The ball that was stolen from the boy.4. "Merrily" is mentioned for?(i) Boy(ii) Water(iii) Street(iv) Ball5. What does "Merrily" mean?(i) Angrily(ii) Ucontrollably(iii) Happily(iv) Sadly

Answer»

1. (i) The boy was sad because he lost his ball.

2. (ii)The ball bounced down the street and went to the water.

3. (iii)The boy who lost the ball.

4. (iv) Hall

5. (iii) Happily

Discussion

23.	Srinu: Metals are used in making of cooking vessels due to their property of heat conductivity. Mohan: Non-metals are used in making of handles of cooking vessels due to their property of heat conductivity. Which one is correct?A) Srinu B) Mohan C) Both A and B D) Neither Srinu nor Mohan
Answer» Correct option is A) Srinu

Discussion

24.	Define conductivity.
Answer» Metals allow the electricity to pass through them. This property of metals is called conductivity.

Discussion

25.

Three elements A, B, and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.

Answer»

Element	Group No.	Valency
A	Group-13	3
B	Group-14	4
C	Group-2	2

Discussion

26.	Name a substances that prevent the blood coagulation in uninjured blood vessels ? How do they act ?
Answer» (i) The anticoagulant heparin prevent the blood from clotting. (ii) The uninjured platelets don't form thromboplastin.

26.

Name a substances that prevent the blood coagulation in uninjured blood vessels ? How do they act ?

Answer»

(i) The anticoagulant heparin prevent the blood from clotting.

(ii) The uninjured platelets don't form thromboplastin.

Discussion

27.	What is meant by conditional statements in JavaScript?
Answer» Conditional statements execute or skip one or set of statements depending on the value of a specified conditional expression.

Discussion

28.	The composition of …………. in air is about 78% by volume. (A) CO2 (B) O2 (C) N2 (D) Ar
Answer» Correct option is : (C) N₂ The composition of N₂, O₂ and CO₂ in air are 78%, 21% and 0.03% respectively by volume Correct option is (C) N₂

28.

The composition of …………. in air is about 78% by volume. (A) CO2 (B) O2 (C) N2 (D) Ar

Answer»

Correct option is : (C) N₂

The composition of N₂, O₂ and CO₂ in air are 78%, 21% and 0.03% respectively by volume

Correct option is (C) N₂

Discussion

29.	Poor Abbu Khan was almost in tears. Why ?
Answer» Abbu Khan’s goat had run away up the hill. He was sure that the wolf on the hilltop had killed her. Abbu Khan took good care of the goat and so he did not understand why she broke the string and ran away. So he was in tears.

Discussion

30.	Which of the following is CORRECT for both gases and liquids? (A) Indefinite volume (B) Definite shape (C) Indefinite shape (D) Definite volume
Answer» Correct option is: (C) Indefinite shape Solids have definite shape and volume, liquids have definite volume but indefinite shape and gases have Indefinite shape as well as volume. (C) Indefinite shape

30.

Which of the following is CORRECT for both gases and liquids? (A) Indefinite volume (B) Definite shape (C) Indefinite shape (D) Definite volume

Answer»

Correct option is: (C) Indefinite shape

Solids have definite shape and volume, liquids have definite volume but indefinite shape and gases have Indefinite shape as well as volume.

(C) Indefinite shape

Discussion

31.	Arrange the following liquids in the increasing order of their normal boiling points:C2H5OH, (C2H5)2O, H2O
Answer» (C₂H₅)₂O < C₂H₅OH < H₂O.

Discussion

32.	A rubber balloon permeable to hydrogen in all its isotopic forms is filled with deuterium (D2) and then placed in a box containing pure hydrogen. Will the balloon expand or contract or remain as it is?
Answer» Balloon will expand because rate of diffusion of H₂ is greater than that of D₂.

Discussion

33.	A balloon has a volume of 175 L when filled with hydrogen at a pressure of 1.00 atm. Calculate the volume of the balloon when it rises to a height of 2000 m, where the atmospheric pressure is 0.80 atm. Assume that the temperature is constant.
Answer» V₁ = 175 L V₂ = ? p₁ = 1.0 atm and p₂ = 0.80 atm As the temperature is constant, therefore by Boyle's law. p₁V₁ = p₂V₂ 1 x 175 = 0.80 x V₂ or, V₂ = 175/0.80 = 218.75 litres

33.

A balloon has a volume of 175 L when filled with hydrogen at a pressure of 1.00 atm. Calculate the volume of the balloon when it rises to a height of 2000 m, where the atmospheric pressure is 0.80 atm. Assume that the temperature is constant.

Answer»

V₁ = 175 L

V₂ = ?

p₁ = 1.0 atm and

p₂ = 0.80 atm

As the temperature is constant, therefore by Boyle's law.

p₁V₁ = p₂V₂

1 x 175 = 0.80 x V₂

or, V₂ = 175/0.80 = 218.75 litres

Discussion

34.	In the below fig, write all pairs of adjacent angles and all the linear pairs.
Answer» Adjacent angles are (i) ∠AOC, ∠COB (ii) ∠AOD, ∠BOD (iii) ∠AOD, ∠COD (iv) ∠BOC, ∠COD Linear pairs : ∠AOD, ∠BOD, ∠AOC, ∠BOC

34.

In the below fig, write all pairs of adjacent angles and all the linear pairs.

Answer»

Adjacent angles are

(i) ∠AOC, ∠COB

(ii) ∠AOD, ∠BOD

(iii) ∠AOD, ∠COD

(iv) ∠BOC, ∠COD

Linear pairs : ∠AOD, ∠BOD, ∠AOC, ∠BOC

Discussion

35.	By increasing the cost of entry ticket to a fair in the ratio 10 : 13, the number of visitors to the fair has decreased in the ratio 6 : 5. In what ratio has the total collection increased or decreased?
Answer» Let the cost of the entry ticket initially and at present be 10 x and 13x respectively. Let the number of visitors initially and at present be 6y and 5y respectively. Initially, total collection = 10x × 6y = 60 xy At present, total collection = 13x × 5y = 65 xy Ratio of total collection = 60 xy : 65 xy = 12 : 13 Thus, the total collection has increased in the ratio 12 : 13.

35.

By increasing the cost of entry ticket to a fair in the ratio 10 : 13, the number of visitors to the fair has decreased in the ratio 6 : 5. In what ratio has the total collection increased or decreased?

Answer»

Let the cost of the entry ticket initially and at present be 10 x and 13x respectively.

Let the number of visitors initially and at present be 6y and 5y respectively.

Initially, total collection = 10x × 6y = 60 xy

At present, total collection = 13x × 5y = 65 xy

Ratio of total collection = 60 xy : 65 xy = 12 : 13

Thus, the total collection has increased in the ratio 12 : 13.

Discussion

36.	A sample of helium has a volume of 500 cm3 at 373 K. Calculate the temperature at which the volume will become 260 cm3 . Assume that the pressure is constant.
Answer» V₁ = 500 cm³ , V₂ = 260 cm³ T₁ = 373 K, T₂ = ? By Charle's Law, \(\frac{V_1}{T_1}=\frac{V_2}{T_2}\) T₂ = \(\frac{V_2T_1}{V_1}\) = \(\frac{263\times373}{500}\) = 196.19 K

36.

A sample of helium has a volume of 500 cm3 at 373 K. Calculate the temperature at which the volume will become 260 cm3 . Assume that the pressure is constant.

Answer»

V₁ = 500 cm³ , V₂ = 260 cm³

T₁ = 373 K, T₂ = ?

By Charle's Law,

\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\)

T₂ = \(\frac{V_2T_1}{V_1}\)

= \(\frac{263\times373}{500}\)

= 196.19 K

Discussion

37.	40% of (100 – 20% of 300) = ………………….. A) 19 B) 10 C) 26 D) 16
Answer» Correct option is D) 16 Correct option is (D) 16 40% of (100 – 20% of 300) = 40% of (100 – \(\frac{20}{100}\times\) 300) = 40% of (100 - 60) = 40% of 40 \(=\frac{40\times40}{100}\) = 16

37.

40% of (100 – 20% of 300) = ………………….. A) 19 B) 10 C) 26 D) 16

Answer»

Correct option is D) 16

Correct option is (D) 16

40% of (100 – 20% of 300)

= 40% of (100 – \(\frac{20}{100}\times\) 300)

= 40% of (100 - 60)

= 40% of 40

\(=\frac{40\times40}{100}\) = 16

Discussion

38.	A sample of nitrogen gas occupies a volume of 1.000 L at a pressure of 0.500 atm at 40ºC. Calculate the pressure if the gas is compressed at 225 cm3 at – 6ºC.
Answer» P₁ = 0∙500 atm, P₂ =? V₂ = \(\frac{225}{1000}\) = 0.225 L T₁ - 273 + 40 = 313 K T₂ = 273 + 6 = 267 K By applying ideal gas equation, \(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\) P₂ = \(\frac{P_1V_1\times T_2}{T_1\times V_2}\) = \(\frac{0.500\times 1\times267}{313\times0.225}\) P₂ = 1.89 atm

38.

A sample of nitrogen gas occupies a volume of 1.000 L at a pressure of 0.500 atm at 40ºC. Calculate the pressure if the gas is compressed at 225 cm3 at – 6ºC.

Answer»

P₁ = 0∙500 atm, P₂ =?

V₂ = \(\frac{225}{1000}\) = 0.225 L

T₁ - 273 + 40 = 313 K

T₂ = 273 + 6 = 267 K

By applying ideal gas equation,

\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)

P₂ = \(\frac{P_1V_1\times T_2}{T_1\times V_2}\)

= \(\frac{0.500\times 1\times267}{313\times0.225}\)

P₂ = 1.89 atm

Discussion

39.	The new salary of a person after increasing 10% is ₹ 1,54,000 then the old salary was ……………….. A) ₹ 1,70,001 B) ₹ 1,90,000C) ₹ 1,30,000 D) ₹ 1,40,000
Answer» Correct option is D) ₹ 1,40,000 Correct option is (D) ₹ 1,40,000 Let old salary of the person is Rs x. \(\therefore\) Salary after increasement of 10% = Rs (x + 10% of x) \(=Rs(x+\frac{10x}{100})=Rs(x+\frac{x}{10})\) \(=Rs\frac{11x}{10}\) \(\therefore\) \(\frac{11x}{10}\) = 154000 \((\because\) New salary is Rs 154000) x = 154000 \(\times\frac{10}{11}\) = 140000 Thus, the old salary of the man was Rs 1,40,000.

39.

The new salary of a person after increasing 10% is ₹ 1,54,000 then the old salary was ……………….. A) ₹ 1,70,001 B) ₹ 1,90,000C) ₹ 1,30,000 D) ₹ 1,40,000

Answer»

Correct option is D) ₹ 1,40,000

Correct option is (D) ₹ 1,40,000

Let old salary of the person is Rs x.

\(\therefore\) Salary after increasement of 10% = Rs (x + 10% of x)

\(=Rs(x+\frac{10x}{100})=Rs(x+\frac{x}{10})\)

\(=Rs\frac{11x}{10}\)

\(\therefore\) \(\frac{11x}{10}\) = 154000 \((\because\) New salary is Rs 154000)

x = 154000 \(\times\frac{10}{11}\) = 140000

Thus, the old salary of the man was Rs 1,40,000.

Discussion

40.	On a Monday 845 people visited a park and on Tuesday 169 people visited then how much decrease percentage is observed in visitors ? A) 20% B) 30% C) 70%D) 80%
Answer» Correct option is D) 80% Correct option is (D) 80% Decreasement = 845 - 169 = 676 Decrease percentage \(=\frac{\text{Decreasement}}{845}\times100\%\) \(=\frac{676}{845}\times100\%\) = 80%

40.

On a Monday 845 people visited a park and on Tuesday 169 people visited then how much decrease percentage is observed in visitors ? A) 20% B) 30% C) 70%D) 80%

Answer»

Correct option is D) 80%

Correct option is (D) 80%

Decreasement = 845 - 169 = 676

Decrease percentage \(=\frac{\text{Decreasement}}{845}\times100\%\)

\(=\frac{676}{845}\times100\%\) = 80%

Discussion

41.	What do you mean by chemistry?
Answer» Chemistry is the branch of science that deals with the composition,structure and properties of matter. Chemistry is called the science of atoms and molecule.

Discussion

42.	Give an example of artificial sweetener that could have been recommended to diabetic patient?
Answer» An example of artificial sweetener that could have been recommended to diabetic patient is Sucralose.

Discussion

43.	Give one example of artificial sweetner used by diabetic patients.
Answer» Saccharin (in form of sodium salt) is taken as artificial sweetner by diabetic patients.

Discussion

44.	Which alkaloid is used for1. hypertension2. malaria fever
Answer» 1. Reserpine 2. Quinine

44.

Which alkaloid is used for1. hypertension2. malaria fever

Answer»

1. Reserpine

2. Quinine

Discussion

45.	What is the nature of an antacid?
Answer» Substances which reduce the release of excess HCl by preventing the interaction of histamine with the receptors present in the stomach wall are called antacids. Examples: cimetidine and ranitidine.

Discussion

46.

Veg puffs from a particular bakery have an average mass of 27.0 g, whereas egg puffs from the same bakery have an average mass of 40 g.i. Suppose a person buys 1 kg of veg puff from the bakery. Calculate the number of veg puffs he receives.ii. Determine the mass of egg puffs (in kg) that will contain the same number of eggs puffs as in one kilogram of veg puffs.

Answer»

i. Mass of a veg puff = 27.0 g = 0.027 kg

∴ Number of veg puffs in 1 kg = 1 / 0.027 = 37

ii. One kilogram of veg puffs contains 37 veg puffs.

Mass of 37 egg puffs = 37 × 0.040

= 1.48 kg

i. 37 veg puffs in 1 kg of puff.

ii. Mass of 37 egg puffs is 1.48 kg

Discussion

47.	Which of the following is a major tranquilizer?(a) diazepam (b) valium (c) clozapine (d) alprazolm
Answer» (c) clozapine

Discussion

48.	Define a tranquilizer.
Answer» Tranquilizers are drugs which act on central nervous system to help in reducing anxiety.

Discussion

49.	Which one of the following is an example for tranquilizer? (a) cimetidine (b) diazepam (c) histamine (d) PABA
Answer» (b) diazepam

Discussion

50.	Identify the medicine that is used to treat stress, anxiety. depression and schizophrenia. (a) valium (b) cimetidinc (c) chiorofom(d) adenosine
Answer» Valium is used to treat stress, anxiety. depression and schizophrenia.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Use Hund’s rule to derive the electronic configuration of Ce3+ ion, and calculate its magnetic moment on the basis of ‘spin- only’ formula.

Calculate the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25.

Comment on the following: (i) Zr and Hf have similar sizes(ii) Actinones show greater no. of oxidation state than Lanthanones.

Give reasons for the following:(i) Fe has higher melting point than Cu.(ii) [Ti (H2O)6]3+ is coloured while [Sc(H2O)6] 3+ is colourless.

In which case a consumer cannot complain against the manufacturer for a defective product?(a) Date of expiry unspecified (b) Price of the commodity (c) Batch number of the commodity (d) Address of the manufacturer

Consumer’s face various problems from the producer’s end due to (a) Unfair trade practices (b) Wide range of goods (c) Standard quality goods (d) Volume of production

Consumers must be provided with adequate information about a product to make(a) Investment in production(b) Decision in sale of goods(c) Credit purchase of goods(d) Decision in purchase of goods

Describe consumer protection.

Match the followingThe Consumer Protection Act1955The Legal Metrology Act1986The Bureau of Indian Standards Act2009The Essential Commodities Act1986

The system of consumer courts at the national, state, and district levels, looking into consumers grievances against unfair trade practices of businessmen and providing necessary compensation, is called(a) Three tier system (b) One tier system (c) Two tier system (d) Four tier system

Mixing other extraneous material of inferior quality with a superior quality material is called (a) Purification(b) Adulteration(c) Refinement(d) Alteration

Insecticide obtained from neem plant is(a) pyrethrin (b) pyrethroid (c) thiocarbamate (d) azadirachtin

State disadvantages of friction.

If two temperatures differ by 25°C on Celsius scale, the difference in temperature on Fahrenheit scale is (A) 65° (B) 45° (C) 38° (D) 25°

A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time −(i) the length of the shadow cast by another pole 10 m 50 cm high(ii) the height of a pole which casts a shadow 5 m long.

In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?

In a ship of length 28 m, height of its mast is 12 m. If the height of the mast in its model is 9 cm what is the length of the model ship?

Do you think the words ‘lept’ and ‘lep’ in the third stanza are spelt correctly ? Why does the poet spell them like this ?

Srinu: Metals are used in making of cooking vessels due to their property of heat conductivity. Mohan: Non-metals are used in making of handles of cooking vessels due to their property of heat conductivity. Which one is correct?A) Srinu B) Mohan C) Both A and B D) Neither Srinu nor Mohan

Define conductivity.

Three elements A, B, and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.

Name a substances that prevent the blood coagulation in uninjured blood vessels ? How do they act ?

What is meant by conditional statements in JavaScript?

The composition of …………. in air is about 78% by volume. (A) CO2 (B) O2 (C) N2 (D) Ar

Poor Abbu Khan was almost in tears. Why ?

Which of the following is CORRECT for both gases and liquids? (A) Indefinite volume (B) Definite shape (C) Indefinite shape (D) Definite volume

Arrange the following liquids in the increasing order of their normal boiling points:C2H5OH, (C2H5)2O, H2O

A rubber balloon permeable to hydrogen in all its isotopic forms is filled with deuterium (D2) and then placed in a box containing pure hydrogen. Will the balloon expand or contract or remain as it is?

A balloon has a volume of 175 L when filled with hydrogen at a pressure of 1.00 atm. Calculate the volume of the balloon when it rises to a height of 2000 m, where the atmospheric pressure is 0.80 atm. Assume that the temperature is constant.

In the below fig, write all pairs of adjacent angles and all the linear pairs.

By increasing the cost of entry ticket to a fair in the ratio 10 : 13, the number of visitors to the fair has decreased in the ratio 6 : 5. In what ratio has the total collection increased or decreased?

A sample of helium has a volume of 500 cm3 at 373 K. Calculate the temperature at which the volume will become 260 cm3 . Assume that the pressure is constant.

40% of (100 – 20% of 300) = ………………….. A) 19 B) 10 C) 26 D) 16

A sample of nitrogen gas occupies a volume of 1.000 L at a pressure of 0.500 atm at 40ºC. Calculate the pressure if the gas is compressed at 225 cm3 at – 6ºC.

The new salary of a person after increasing 10% is ₹ 1,54,000 then the old salary was ……………….. A) ₹ 1,70,001 B) ₹ 1,90,000C) ₹ 1,30,000 D) ₹ 1,40,000

On a Monday 845 people visited a park and on Tuesday 169 people visited then how much decrease percentage is observed in visitors ? A) 20% B) 30% C) 70%D) 80%

What do you mean by chemistry?

Give an example of artificial sweetener that could have been recommended to diabetic patient?

Give one example of artificial sweetner used by diabetic patients.

Which alkaloid is used for1. hypertension2. malaria fever

What is the nature of an antacid?

Which of the following is a major tranquilizer?(a) diazepam (b) valium (c) clozapine (d) alprazolm

Define a tranquilizer.

Which one of the following is an example for tranquilizer? (a) cimetidine (b) diazepam (c) histamine (d) PABA

Identify the medicine that is used to treat stress, anxiety. depression and schizophrenia. (a) valium (b) cimetidinc (c) chiorofom(d) adenosine