InterviewSolution
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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.
| 2901. |
From the elements Li, K, Mg, C, Al, S identify the element that belongs to group 13. |
| Answer» SOLUTION :ALUMINIUM BELONGS to GROUP 13. | |
| 2902. |
Distinguish between linear, areal (or) superficial expansion. |
Answer» SOLUTION : 
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| 2903. |
Calculate the molecular mass of the HCl |
Answer» SOLUTION :
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| 2904. |
Which are the incuable diseases ? |
| Answer» Solution :AIDS, truberculosis, leprosy, cancer of all TYPES and PSYCHOLOGICAL disorders are incurable DISEASES. | |
| 2905. |
List the main consttuents of a nuclear reactor and give their functions. |
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Answer» Solution :(i) Concrete chamber: Main fission PROCESS takes PLACE. (ii) Moderators : Grahite or heavy water to REDUCE speed of neutrons. (iii) Control rods: Cadmium or boron rods capable of absorbing neutrons. (iv) Coolants: Water or LIQUID SODIUM. (v) Electricity-generating supplier: To generate electricity. |
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| 2906. |
Relative humidity of air at dew point is 60%. |
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Answer» SOLUTION :False. RELATIVE humidity of air at DEW point is 100%. |
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| 2907. |
We feel that some objects are cold, and some are hot. Is this feeling related in some way to our body temperature ? Give reasons. Also explain this with reference to the zeroth law of thermodynamics. |
| Answer» SOLUTION :Yes, If the temperature of the OBJECTS is LOWER than our bodytemperature,e.g., ice, we feel the OBJECT is higher than our BODY temperature, e.g., hot water, we feel the object is hot. | |
| 2908. |
Explain why the planets do not twinkle but the stars twinkle. |
| Answer» Solution :Stars are very far away from the earth and behave as almost a point object. The atmosphere is made of several layers and their refractive INDICES keep on CHANGING continuously. So the light rays COMING from the star keep on changing their paths contimuously. As a consequence, the number of rays (or the light energy) entering in the pupil of the eye GOES on changing with time and the stars appear twinkling A planet is comparatively nearer to the earth and subtends a larger angle at the eye. So, it may be considered as a collection of large number of point sized objects. Due to atmospheric refraction, quantity of light coming from any ONE point sized object changes with time but the total light entering the observer.s eye due to all these point objects remains almost the same. As a result the planet does not twinkle. | |
| 2909. |
The acceleration of a falling object is due to the Earth's __________ force . |
| Answer» SOLUTION :GRAVITATIONAL | |
| 2910. |
The number of significant figures in 30.00 m are |
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Answer» 1 |
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| 2911. |
A coolie X carrying a load on his head climbs up a slope and another coolie Y carrying the identicalload on his head moves the same distance on a frictionless horizontal platform. Who does more work. Explain the reason |
| Answer» SOLUTION :Coolie X does work against the FORCE of gravity while COLLIE T does no work because his DISPLACEMENT is normal to the force of gravity. | |
| 2912. |
Which way does the wire in the diagram below tend to move ? |
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| 2913. |
Differentiate between box - type solar cooker and spherical reflector type solar cooker. |
Answer» SOLUTION :
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| 2914. |
Infectious viruses: Biological disaster::Tsunami:___________ |
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Answer» Solution :GEOPHYSICAL disaster Infectious viruses are causes of biological disasters, WHEREAS TSUNAMI is cause of geophysical disaster. |
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| 2915. |
Draw velocity vectors in the given figure at times t = 0, 1s, 2s, 3s. |
Answer» Solution :From the graph, we CONCLUDE that when the BALL moves down the INCLINED plane its speed increases gradully but its DIRECTION remains CONSTANT. 
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| 2916. |
Answer the question : What is the deadly effect of sicial illness ? |
| Answer» SOLUTION :Nowadays, evaryone has to face MENTAL stress due to social illnesses LIKE ever increasing disorder, crime, violence etc. At the same time, people looking at this as 'fast and easy way of making money' may become scapegoats and become PART of such system. This is the deadly effect of social illness. | |
| 2917. |
Both outside and inside a bar magnet, the magnetic field lines start from north pole and end at the south pole. |
| Answer» Solution : Outside a bar MAGNETIC field lines START from north pole and end at the south pole. HOWEVER, INSIDE the MAGNET field lines start from south pole and end at north pole. | |
| 2918. |
A particle falls towards the earth from inifinity. The velocity with which it reaches the earth is surface is |
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Answer» INFINITY |
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| 2919. |
Draw a schematic circuit diagram consisting a battery, a plug key, an ammeter and a bulb all connected in series with the bulb. Also show a voltmeter across the bulb. |
Answer» SOLUTION :
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| 2920. |
What are the limitations in harnessing tidal energy? |
| Answer» SOLUTION :Few suitable places for BUILDING tidal energy farms, RISE and fall of water is not enough to generate electricity on large SCALE . | |
| 2921. |
The x and y coordinates of a particle at any time t is given by x = 7t + 4t^(2) and y = 5t, where x and y are in metre and t in seconds. The acceleration of particle at t = 5s is |
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Answer» Zero `V_(x)=(dx)/(dt)=7+8t` `a_(x)=(dv_(x))/(dt)=8` `y=5t` `V_(y)=(dy)/(dt)=5` `a_(y)=(dv_(y))/(dt)=0 m//s^(2)` `a=sqrt(a_(x)^(2)+a_(y)^(2))=sqrt(8^(2)+0)` `=8 m//s^(2)` |
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| 2922. |
Pre-disaster management: Preparationand warning: : Post-disaster management : ……………. |
| Answer» SOLUTION :RESURGENCE and RESTORATION | |
| 2923. |
Effervescence is formed when the better for cake is heated. Which substanceis added to the batter to make the cake soft and fluffy ? Name the gas evolved. |
| Answer» SOLUTION :This SUBSTANCE is BAKING SODA and the GAS evolved is `CO_(2)` gas. | |
| 2924. |
The spherical aberration can be minimised by |
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Answer» REDUCING the aperture of the lens |
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| 2925. |
When does the Charle's law fail? |
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Answer» Solution :By Charle.s LAW at constant pressure `V prop T or T prop V` at T=oK volume must be zero but it is IMPOSSIBLE, at low temperature gases does not obey the characterise of ideal gas. As the MOLECULES comes closer and force of ATTRACTION and repulsion takes place |
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| 2926. |
Track the changes in methods of animal classification . How the methods of animal classification changed over the time ? |
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Answer» Solution :There were different METHODS of classification of animals . (1) The first classification method was given by the GREEK philosopher Aristotle . He took into account the criteria like body size, habits and habitats of the animals . This method was called artificial method of classification. (2) The same artificial method has used by other scientists such as THEOPHRASTUS , Pliny , John Ray ,Linnaeous, ETC. (3) Further due to advancesin science the refrences were changed and there were some new methods of classification proposed. (4) The system of classification called ' Natural system of classification 'was then proposed . This system of classification was based on criteria such as body organization , types of CELLS, choromosomes, bio - chemical propertise , etc. (5) Later, Dobzhansky and Meyer gave the system of classification based on evolution . (6) In 1977 , Carl Woese has also proposed the three domain system of animal classification . |
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| 2927. |
2,50,00,000 years ago : Drypithecus : : 1,50,000 years ago : …… |
| Answer» SOLUTION :NEANDERTHAL MAN | |
| 2928. |
Imagine that in an area containing green bushes, almost equal number of brown grasshoppers and green grasshoppers are living. Which grasshoppers would be eaten by the birds easily? Why? Population of which grasshoppers increases gradually? Name the phenomenon which directs evolution here. |
| Answer» SOLUTION :The population of GREEN grasshoppers will increase because they will not be visible on green grass as a RESULT, the BROWN grasshoppers will get EATEN. The phenomenon involved is natural selection | |
| 2929. |
Assertion: Radioactivity is a spontaneous process. Reason: Nuclear radiation emission depends on the nature of substance. |
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Answer» Both assertion and reason are TRUE and reason is CORRECT EXPLANATION of assertion. |
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| 2930. |
Persons continuously using computers and the internet become____________ |
| Answer» Solution :Persons CONTINUOUSLY USING COMPUTERS and the internet become ` UL( solitary) ` | |
| 2931. |
Distinguish between Nuclear fission and nuclear fussion. |
Answer» SOLUTION : 
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| 2932. |
What is the power of a lens ? |
| Answer» SOLUTION :The capacity of a LENS to CONVERGE or diverge incident RAYS is called its power of a lens. | |
| 2933. |
In the above question, what happens to the velocity of the car from P to Q? |
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Answer» VELOCITY REMAINS constant |
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| 2934. |
Concave lens and Convex lens |
Answer» SOLUTION :
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| 2935. |
A single fixed pulley is used because it: |
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Answer» has mechanical advantage GREATER than 1 |
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| 2936. |
An electric heater of resistance 8 ohm draws 15A from the service mains for 2 hours.Calculate the rate at which heat is developed in the heater. |
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Answer» Solution :Here, 1= 15 A, `R = 8 Omega, t = 2H` The rate at which heat is developed in theheater means its ELECTRIC power, `P =I^2R` `=(15)^2 xx 8 =225 xx8 1800 W =1800 J/s` |
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| 2937. |
The pulley arrangement of fig. are identical. The mass of the rope is negligible. In (a) mass m is lifted up by attaching a mass (2 m) to the other end of the rope. In (b), m is lifted up by pulling the other end of the rope with a constant downward force F =2 mg. In which case, the acceleration of m is more ? |
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Answer» SOLUTION :Case (a): `a=((2m-m)/(2m+m))g` `a=(g)/(3)` Case (B): FBD of MASS m  `ma'=T-mg` ma'=2mg-mg `rArr ma'=mg` a'=g So in case (b) ACCELERATION of m is more. |
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| 2938. |
The heat energy released during nuclear fission and fusion is due to the : |
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Answer» conversion of STORED CHEMICALS into energy |
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| 2939. |
The disease related with the deficient synthesis of insulin is heart disease. |
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| 2941. |
What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbitat an altitude of 2R? |
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Answer» Solution :`E_(1)= -(GMM)/(R )= -(mgR^2)/(R )= -mgR` If v is VELOCITY of the satellite at distance 2R, than total energy `E_(2)= K.E. + P.E.` `=(1)/(2)mv^(2)- (GMm)/((2R+R))` Orbital velocity of satellite, `v=sqrt((GM)/(2R+R))" or "v^(2)=(GM)/(3R)` So, `(1)/(2)mv^(2)= (GMm)/(6R)` `E_(2)= (GMm)/(6R)-(GMm)/(3R)= -(GMm)/(6R)= -(mgR)/(6)` Minimum energy required to launch the satellite is `=E_(2)- E_(1)= -(1)/(6)mgR+mgR= (5)/(6)mgR`. |
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| 2942. |
Assertion (A) : A fuse wire is always onnected in parallel with the mainline.Reason (R ) : If a current larger than the specified value flows through the circuit, fuse wire melts. |
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Answer» Both (A) and (R ) are TRUE and (R ) is correct explanation of the assertion. |
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| 2943. |
Define the following terms in the context of spherical mirrors : Pole, centre of curvature, principal axis, and principal focus. |
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Answer» Solution :Pole - The CENTRE of reflecting surface of a spherical mirror is called its pole (P). Centre of curvature - Centre of curvature of a spherical mirror is the centre of the sphere the given mirror is a part of which. Principal axis - Principal axis of a spherical mirror is a straight line passing through its pole and centre of curvature. Principal FOCUS - Principal focus of a spherical mirror is a POINT on its principal axis where light rays coming parallel to its principal axis, after reflection, actually converges to or appears to diverge from. |
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| 2944. |
Complete the Chart : |
Answer» SOLUTION :
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| 2945. |
Which of the four arrangements in the figure correctly shows the vector addition of two forces F1 & F2 to yield the third force F_3? |
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Answer»
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| 2946. |
A sample of gas is at 0^(@)C . To what temperature it must be raised in order to double the rms speed of the molecule |
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Answer» `270^(@)C` |
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| 2947. |
The order of the three layers of cells in the retina of human eye from inside to outside is |
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Answer» Solution :Structure and function of retina in human eye: i. Retina is the light sensitive screen on the back interior wall of the eye BALL. ii. It is a delicate membrane. It consists of large number of light sensitive CELLS. iii. These cells get activated when light falls on it. Hence, they generate electrical signals. iv. These signals are PASSED by OPTIC NERVES to the brain. The brain interprets these signals and processes the infonnation in such a way that we see the objects as they are. |
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| 2948. |
Jewellery articles are gold plated………….. |
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Answer» to PREVENT corrosion |
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| 2949. |
The current in the electric bulb of 100 W and 200 V electric circuit is. . . . . . . . . . |
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Answer» `5A` |
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| 2950. |
Sun appears red at sunrise and sunset because red colour is |
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Answer» LEAST dispersed |
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