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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 8351. |
Using the above table answer the following questions : (a) Compare the atomic sizes of B & C. (b) Select the letter/letters which represent alkali metals. (c) Identify the nature of bonds formed by elements of Group 1 and 14. (d) What would be the electronic configuration of element F ? (e) How does the metallic character vary on going from left to right in a period ? |
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Answer» SOLUTION :(a) Atomic size of C will be smaller than the atomic size of B. (b) A & D are alkali metals. (c) Group 1 elements will form ionic bonds however elements of group 14 will form covalent bonds. (d) Electronic configuration of F is 2, 4. (e) Metallic CHARACTER will decrease will decrease on GOING from left to right in a PERIOD. |
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| 8352. |
One type of energy which has not been controlled so far is : |
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Answer» OCEAN THERMAL energy |
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| 8354. |
Define electric power. An electric motor is rated at 2kW. Calculate the cost of using it for 2 hours daily for the month of September if each unit costs ₹ 6.00. |
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Answer» Solution :Rate at which ELECTRIC ENERGY is consumed / dissipated in an electric circuit. `E= Pxxtxx` no of DAYS = 2kW`xx 2h xx30 = 120` kWh = 120 unit `:. ` COST = `₹ 6xx120 = ₹720.` |
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| 8355. |
J.J Thomson discovered nucleus. |
| Answer» SOLUTION :J.J THOMSON DISCOVERED ELECTRONS. | |
| 8356. |
Name the particle responsible for flow of electric current in a metallic conductor. |
| Answer» SOLUTION :The ELECTRON | |
| 8357. |
What is biogas ? How is it obtained ? |
| Answer» Solution :Biogas is a mixture of `CH_(4), H_(2), CO_(2)` and `H_(2)S`. Methane is its main constitunt. It makes its 65% part. Animal WASTES and plants contain carbon compounds. In the absence of AIR but in the PRESENCE of water the anaerobic bacteria degrades these compounds to produce this GAS. | |
| 8358. |
A ball throuwn vertically upwards with a speed of 19.6ms^(-1) from the top of a tower returns to the earth in 6s. Find the height of the tower. |
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Answer» Solution :using`s= UT+(1)/(2) at^(2)` `-h=19.6 xx 6+(1)/(2)xx(-9.8)xx62` `h=58.8`m. |
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| 8359. |
Draw the ray diagram and also state the position, the relative size and the nature of image formed by a concave mirror when the object is placed at the centre of curvature of the mirror. |
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Answer» SOLUTION :Let an object AB be placed NORMALLY to the principal axis of a concave mirror at its centre of curvature C. When we draw a ray diagram to locate the image FORMED, we find that the image A.B, is formed at the centre of curvature C itself. The image is real, inverted image. Size of the image is exactly EQUAL to the size of the object. It means that magnification of the image is -1. 
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| 8360. |
What is co-efficient of apparent expansion? |
| Answer» Solution :Coefficient of APPARENT expansion is defined as the RATIO of the apparent rise in the VOLUME of the LIQUID per degree rise in temperature to its unit volume. The SI unit of coefficient of apparent expansion is K. | |
| 8361. |
Define simple harmonic motion. Show that the motion of projection of particle performing uniform circular motion, on any diameter is simple harmonic. |
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Answer» Solution :Simple harmonic motion: A body is said to be inS.H.M, If acceleration is directly proportional to its displacement. Acts opposite in direction towards a fixed point. Relation between uniform circular motion and S.H.M.:Let a particle 'P' is rotating in a circular path of radius 'r' with a uniform angular velocity `'omega'`. After time 't' it goes to a new position 'P'. Draw normals form 'P' on to the X-axis and on the Y-axis. Let ON and OM are the PROJECTIONS on X and Y axis respectively. As the paritcle is in motion it will subtend an angle `theta=omegat` at the centre.  From triangle OPN ON=OP `costheta` But `OP = r and theta=omegat` `therefore` Displacement of particle. P on X-axis at any time t is `X=rcosomegat"".............(1)` From triangle OPM `OM=Y-OPsintheta` But `OP=r and theta=omegat` `therefore` Displacement of particle P on Y-axis is `Y=rsin omegat""..............(2)` As the particle rotate in a circular path the FOOT of the perpendicular OM and ON will oscillatiate with in the limits `X to X^(1) and Y to Y^(1)`. At any point the displacement of particle P is given by `OP^(2)=OM^(2)+ON^(2)` SINCE `OM=X=rcosomegat and ON=Y=r sinomegat.` So a uniform circular motion can be treated as a combination of two mutually perpendicular simple harmonic motions. |
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| 8362. |
The following table gives the refractive indices of a few media: Use this table to give an example of: i)a medium pair so that light speeds up when it goes from one of these medium to another. ii) a medium pair so that lights slows down the when it goes from one of these medium to another. |
| Answer» SOLUTION :i) A II) D | |
| 8363. |
Is saving energy the need of the hour? Why do you think so? Quote examples to support your answer. |
| Answer» Solution :In modern civilization, continuous energy supply is needed for the technology and development. The energy has become a basic need for man. Most of the energy used in India is obtained from thermal power plant. For this energy generation, various fuels are used. The coal and fossil fuels are limited. DUE to over-exploitation, these RESERVES are getting fast depleted. Use of fossil fuels is also resulting in pollution and climate change. NUCLEAR energy can be very hazardous. Lot of RESEARCH is being done in the field of GREEN energy, but the tremendoushuman population always is un need of more energy. Therefore, each and every person should save the energy, as saving energy is the need of the hour. | |
| 8364. |
Figure shows two identical prisms P and Q placed with their faces parallel to each other. A light ray AB of yellow colour is incident at the face of the prism P. Complete the diagram to show the path of the ray till it emerges out of the prism Q. |
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Answer» <P> Solution :The completed DIAGRAM is SHOWN in figure in which the ray CD emeging out of the prism Q is PARALLEL to the ray AB INCIDENT on the prism P. .
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| 8365. |
From the above table, Which one does pass the electricity ? |
| Answer» SOLUTION :COPPER PASSES the ELECTRICITY. | |
| 8366. |
What are the advantages of using biogas? |
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Answer» Solution :Cretinism: It is caused due to decreased secretion of thyroid hormone (thyroxine) in children. The conditions are stunted growth, mental defect, lack of skeletal development and deformed bones. (ii) • Brightly coloured flowers, with smell and nectar. • Pollen GRAIN are larger in size, the exine is pitted, spiny so they can be adhered firmly on the sticky stigma. (iii) The advantages of using biogas are as follows: (a) It burns without smoke and therefore causing less pollution. (b) An excellent way to get rid of ORGANIC wastes like bio-waste and SEWAGE material. (c) Left over slurry is a good manure rich in nitrogen and phosphorus. (d) It is SAFE and convenient to use. (e) It can reduce the amount of green house gases emitted. |
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| 8367. |
(i) Name the defect of vision in which the eye loses its power of accommodation due to old age. (ii) The near point of a person suffering from hypermetropia is at 50 cm from his eye. What is the power of the lens needed to correct this defect? (near point of normal eye is 25 cm) |
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Answer» Solution :(i) Presbyopia (ii) `v=-50cm` `u=25cm`. Using LENS formula `(1)/(f)=(1)/(v)-(1)/(u)rArr (1)/(f)=(1)/(-50)+(1)/(25)=(-1+2)/(50)` `(1)/(f)=(1)/(50) therefore f=50cm` `"POWER of lens,"P=(1)/(f(m))=(100)/(50)=+2D` 
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| 8368. |
List three characteristic features of the electric current used in our homes. |
| Answer» SOLUTION :Electric CURRENT used in our HOUSES is an ALTERNATING current it is being SUPPLIED at 220 V voltage and its frequency is 50 Hz. | |
| 8369. |
Assertion: Sound travels faster in solids than in gases. Reason : Solid posses a greater density than that of gases. |
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Answer» If both the ASSERTION and the reason are true and the reason is the CORRECT EXPLANATION of the assertion. |
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| 8370. |
Which of the following things must not be done at the time of a fire? |
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Answer» Inform fire brigade |
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| 8371. |
Describe the Darwin's theory of natural selection |
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Answer» Solution :(1) Charles Drawin proposed the theory of natural SELECTION after making many observations on different specimens. He published a concept 'Survival of the fittest'. (2) Drawin explains this concept as FOLLOWS: all the organisms reproduce prolifically. THEREFORE, there is always a competition for food, mate, etc. Only those organisms survive which show the adaptations for SUSTAINING this struggle. (3) Natural selection plays important role by selecting only those organisms which are fit to live. Those that do not have better adaptations, perish. Selected sustaining organisms then perform reproduction and form new species in a very long period of TIME. (4) Darwin published his views in the book titled 'Origin of Species'. |
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| 8372. |
Take a convex lens and allow sunlight to fall on it. Hold a paper screen on the opposite side. Move the paper screen slowly away from the lens till a sharp bright spot is formed on the screen. Which phenomenon is responsible for this bright spot? What represents the sharp bright spot on paper screen? What is the focal length of this convex lens? Is the image of the sun always real? |
| Answer» Solution :The SHARP bright spot is due to refraction of sunlight from convex lens. It represents the IMAGE of the SUN. The distance of paper screen from the lens is called focal length of convex lens. The image of the sun is always REAL as it is obtained on the screen. | |
| 8373. |
The major cause of environmental pollution is the use of : |
| Answer» Answer :d | |
| 8374. |
kWh |
| Answer» Solution :A kilowatt HOUR is the amount of ENERGY in kilowatt that an appliance CONSUMES when it OPERATES for one hour. | |
| 8375. |
Stem cells and organ transplantation . |
Answer» SOLUTION :
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| 8376. |
The refractive index of a medium 'x' with respect to a medium y is 2/3 and the refractive index of medium with respect to medium 'z' is 4/3. Find the refractive index of medium 'z' with respect to medium 'x'. If the speed of light in medium 'x' is 3 xx 10^(8) m s^(-1) ,into to calculate the speed of light in medium 'y'. |
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Answer» Solution :As per question, refractive INDEX of medium x w.r.t medium y, `n_(xy) = (2)/(3)` and refractive index of medium y w.r.t. medium z, `n_(yz) = (4)/(3)` and SPEED of light in medium x, `V_(x) = 3 xx 10^(8) m s^(-1)` `:.` Refractive index of medium z w.r.t. medium x will be `n_(zx) = (n_(zy))/(n_(xy)) = (1)/((n_(yz)) xx (n_(xy))) = (1)/((4)/(3) xx (2)/(3)) = (9)/(8)` As `n_(xy) = (V_(y))/(V_(x))`, HENCE `V_(y) = V_(x) xx n_(xy) = (3 xx 10^(8)) xx (2)/(3) = 2 xx 10^(8) m s^(-1)` |
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| 8377. |
What is the potential difference between the ends of resistor of 15Omega when a current of 2A passes through it ? |
| Answer» ANSWER :A | |
| 8378. |
What is lake tapping ? Why it takes place? |
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Answer» Solution :i). Lake tapping is a process in which a tunnel is dug out near the bottom of a lake uptothe WATER-rock contact of the lake. The final layer of the rock is then blasted with the HELP of dynamite which provides the INFLOW of water into the tunnel with more speed. ii). It is DONE to facilitate the generation of electricity when the water level goes down in peak SUMMER. iii). Thus it also helps the areas suffering with drought due to scarcity of water during summer. |
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| 8379. |
Red coloured light is used in traffic signals to indicate the vehicles to stop, because compared to other coloured red light |
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Answer» has HIGH frequency |
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| 8380. |
The formula for conversion of temperature from Kelvin to Celsius is ___________. |
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Answer» C = K+73 |
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| 8381. |
A student accidently spilled concentrated H2S04 on his hand. Before the teacher got to know, his friend washed his hands with water and also with soap but the burning sensation on hand still continued. His friend then rubbed solid sodium bicarbonate on his hand and then washed with water, finally the burning sensation is relieved. Answer the following questions based on the above situation: (i) Mention the values shown by student's friend. (ii) Can you recommend any other substance available in the laboratory which can be used instead of sodium bicarbonate? (iii) Write the chemical reaction involved in the treatment of acid bum with sodium bicarbonate. |
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Answer» Solution :(i) Presence of mind, critical THINKING and dignity of individual. (ii) Pouring dilute sodium hydroxide on the BURNING hand and keeping in water for 10 minutes can ALSO be done. (III) `2NaHCO_(3) + H_(2) SO_(4) to Na_(2) SO_(4) + 2H_(2) O+ 2CO_(2)` |
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| 8382. |
Give one criticism about large dams. |
| Answer» Solution :LARGE DAMS consume large AMOUNT of public MONEY without the generation of proportionate BENEFITS. | |
| 8383. |
Green corridor refers to a special road route that enables harvested organs meant for transplants to reach the destined hospital. A 45-year-old woman, a victim of a railway accident, was declared brain dead, her husband and children agreed to donate her kidneys, liver and heart. One of her kindneys was trasplanted to a patient in MGM Hospital and the second kidney helped a patient in Jaslok hospita. Her liver helped the transplant of a patient in Wockhardt Hospital. And her heart was sent to Fortis to the patient on a super urgent priority list, transported via a green corridor covering 18km in less then 16 minutes. This was possible due to Green corridor. Which organs of brain-dead lady were transplanted? |
| Answer» SOLUTION :TWO KIDNEYS liver and heart of the brain-dead LADY were transplanted. | |
| 8384. |
Green corridor refers to a special road route that enables harvested organs meant for transplants to reach the destined hospital. A 45-year-old woman, a victim of a railway accident, was declared brain dead, her husband and children agreed to donate her kidneys, liver and heart. One of her kindneys was trasplanted to a patient in MGM Hospital and the second kidney helped a patient in Jaslok hospita. Her liver helped the transplant of a patient in Wockhardt Hospital. And her heart was sent to Fortis to the patient on a super urgent priority list, transported via a green corridor covering 18km in less then 16 minutes. This was possible due to Green corridor. What is Green corridor? |
| Answer» Solution :GREEN CORRIDOR is a special road route that enables harvested ORGANS MEANT for transplants to reach the destined HOSPITAL. | |
| 8385. |
Weightlessness in space: Space travellers as well as objects in the spacecraft appear to be floating. Why does this happen? Though the spacecradft is at a height from the surface of the earth the value of g there is not zero. In the spacestation the value of g is only 11% less than its value on the surface of the earth. Thus, the height of a spacecraft is not the reason for their weightlessness. Their weightlessness is caused by their beingin the state of free fall. Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is the gravitational force of the earth and therefore it is in a free fall state. As the velocity of free fall does not depend on the properties of an object, the velocity of free falls is the same for the spacecraft, the travellers and the objects in the craft. Thus, if a traveller releases an object from her hand, it will remain stationary with respect to her and will appear to be weightless. If a traveller releases an object from her hand in the spacecraft, what will happen? |
| Answer» Solution :The OBJECT will remain STATIONARY with respect to her, because, the velocity of FREE FALL is the same for the sapcecraft, traveller and objects in the craft. | |
| 8386. |
Weightlessness in space: Space travellers as well as objects in the spacecraft appear to be floating. Why does this happen? Though the spacecradft is at a height from the surface of the earth the value of g there is not zero. In the spacestation the value of g is only 11% less than its value on the surface of the earth. Thus, the height of a spacecraft is not the reason for their weightlessness. Their weightlessness is caused by their beingin the state of free fall. Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is the gravitational force of the earth and therefore it is in a free fall state. As the velocity of free fall does not depend on the properties of an object, the velocity of free falls is the same for the spacecraft, the travellers and the objects in the craft. Thus, if a traveller releases an object from her hand, it will remain stationary with respect to her and will appear to be weightless. Why doesn't the spacecraft fall towards the Earth? |
| Answer» Solution :The spacecraft does not fall TOWARDS the Earth because of its VELOCITY ALONG the ORBIT. | |
| 8387. |
Weightlessness in space: Space travellers as well as objects in the spacecraft appear to be floating. Why does this happen? Though the spacecradft is at a height from the surface of the earth the value of g there is not zero. In the spacestation the value of g is only 11% less than its value on the surface of the earth. Thus, the height of a spacecraft is not the reason for their weightlessness. Their weightlessness is caused by their beingin the state of free fall. Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is the gravitational force of the earth and therefore it is in a free fall state. As the velocity of free fall does not depend on the properties of an object, the velocity of free falls is the same for the spacecraft, the travellers and the objects in the craft. Thus, if a traveller releases an object from her hand, it will remain stationary with respect to her and will appear to be weightless. Why is weightlessness caused in a spacecraft? |
| Answer» Solution :The weightlessness is caused by them being in a STATE of free FALL. | |
| 8388. |
Weightlessness in space: Space travellers as well as objects in the spacecraft appear to be floating. Why does this happen? Though the spacecradft is at a height from the surface of the earth the value of g there is not zero. In the spacestation the value of g is only 11% less than its value on the surface of the earth. Thus, the height of a spacecraft is not the reason for their weightlessness. Their weightlessness is caused by their beingin the state of free fall. Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is the gravitational force of the earth and therefore it is in a free fall state. As the velocity of free fall does not depend on the properties of an object, the velocity of free falls is the same for the spacecraft, the travellers and the objects in the craft. Thus, if a traveller releases an object from her hand, it will remain stationary with respect to her and will appear to be weightless. Is the value of g zero in the space station? |
| Answer» Solution :No, the VALUE of G is only 11% LESS than its value on the SURFACE of the EARTH. | |
| 8389. |
Two lighter nuclei combined to form heavier nuclei is nuclear fission. |
| Answer» Solution :Two lighter NUCLEI COMBINED to form heavier nuclei is NUCLEAR FUSION. | |
| 8391. |
The picture given here shows a person wearing 'half-moon' spectacles. What sort of eye-defect do you think he has ? Why are these particular spectacles useful to him ? |
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Answer» |
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| 8392. |
What is meant by power of accommo- dation of the eye ? |
| Answer» Solution :THEABILITY of the EYE lens to adjust its focal length is called accommodation . The MINIMUM distance upto which a normal eye cansee clearly is called. near point. For normal eye. near point is about 25 cm. The maximum distance upto which the eye can SEE clearly is called FAR point . The distance between near point and far point is also called accommodation. | |
| 8393. |
Green corridor refers to a special road route that enables harvested organs meant for transplants to reach the destined hospital. A 45-year-old woman, a victim of a railway accident, was declared brain dead, her husband and children agreed to donate her kidneys, liver and heart. One of her kindneys was trasplanted to a patient in MGM Hospital and the second kidney helped a patient in Jaslok hospita. Her liver helped the transplant of a patient in Wockhardt Hospital. And her heart was sent to Fortis to the patient on a super urgent priority list, transported via a green corridor covering 18km in less then 16 minutes. This was possible due to Green corridor. Who takes the decision to donate the organs? |
| Answer» Solution :The close relatives of DECEASED person take the DECISION to donate the ORGANS. | |
| 8394. |
Green corridor refers to a special road route that enables harvested organs meant for transplants to reach the destined hospital. A 45-year-old woman, a victim of a railway accident, was declared brain dead, her husband and children agreed to donate her kidneys, liver and heart. One of her kindneys was trasplanted to a patient in MGM Hospital and the second kidney helped a patient in Jaslok hospita. Her liver helped the transplant of a patient in Wockhardt Hospital. And her heart was sent to Fortis to the patient on a super urgent priority list, transported via a green corridor covering 18km in less then 16 minutes. This was possible due to Green corridor. How was distance of 18 km covered in 16 minutes? Why? |
| Answer» Solution :The distance was covered because the concept of GREEN corridor was applied. The heart was SENT from one hospital to another, where the reicpient was kept READY. The quick transportation is NECESSARY to KEEP heart in living condition. | |
| 8395. |
Green corridor refers to a special road route that enables harvested organs meant for transplants to reach the destined hospital. A 45-year-old woman, a victim of a railway accident, was declared brain dead, her husband and children agreed to donate her kidneys, liver and heart. One of her kindneys was trasplanted to a patient in MGM Hospital and the second kidney helped a patient in Jaslok hospita. Her liver helped the transplant of a patient in Wockhardt Hospital. And her heart was sent to Fortis to the patient on a super urgent priority list, transported via a green corridor covering 18km in less then 16 minutes. This was possible due to Green corridor. How many lives were saved from organs of one lady? |
| Answer» Solution :FOUR patient's liver were saved DUE to organ donation of ONE LADY. | |
| 8396. |
How is mechanical advantage related with velocity ratio for an actual machine ? State whether the efficiency of such a machine is equal to 1, les sthan 1 or more than 1. |
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| 8397. |
If only an external force can change the state of motion of CM of a body then how does the internal force of the brakes bring bicycle to rest? |
| Answer» Solution :In this case the force which bring the VEHICLE to REST is FRICTION, and it is an EXTERNAL force. | |
| 8398. |
Each human is different from other' is an example of species diversity. |
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Answer» SOLUTION :FALSE. 'Each HUMAN is different from other' is an EXAMPLE of genetic diversity. |
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| 8399. |
The given magnet is divided into three parts A, B andC Name the parts where the strenght of the magnetic field is : (i) maximum(ii) minimum How will density of maganetic field lines differ at these parts ? |
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Answer» Solution :Maximum magnetic field is in the region A and C. (ii) Minimum magnetic field is in the region B. This is because A and C are magnetic poles and have maximum NUMBER of magnetic field line which DETERMINE the intensity of magnetic field while B is centre of the magnet that has no mag- netic field LINES. So intensity of magnetic field NEAR B is ALMOST zero. |
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| 8400. |
A body which allows most of the light to pass through it is called a/an |
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Answer» TRANSPARENT body |
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