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Q:

Pieces of camphor placed on water move about rapidly. This is because of

A) diffusion	B) viscosity
C) surface tension	D) capillarity

Answer & Explanation Answer: C) surface tension

Explanation:

The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. The stronger pull exerted by the uncontaminated portion of water brings about a movement of the surface and the camphor particles are carried along with it. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.

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Filed Under: Physics

Q:

A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

A) increase	B) decrease
C) remains the same	D) first decrease and then increase

Answer & Explanation Answer: B) decrease

Explanation:

Let M and m grams be the mass of boat + rock in it. By law of floatation(M+m) grams of water will be displaced. This has a volume of (M+m)cc. That means the level of water in pool has risen up by (M+m)cc with the boat + rock when it is floating. If the rocks in the boat are thrown not into the pool but outside, the weight left is only M grams the weight of the boat. This will have displaced M cc of water only i.e less water than in the case of loaded boat. But if the rocks are put in the water in the pool and not outside, then the water in the pool will rise not only by M cc on account of empty boat but also by a volume of the stone put into it. This volume will be $\frac{m}{d}$ where m is the mass of rock and d density of rock.

Now $\frac{m}{d}$ is < m. Thus the total rise will be $(M + \frac{m}{d})$ which is < M + m.

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Filed Under: Physics
Exam Prep: AIEEE , CAT
Job Role: Analyst

Q:

If a body weighs 12N on the surface of the earth, how much will it weigh on the surface of the moon where acceleration due to gravity is only one-sixth of that on earth's surface?

A) 12N	B) 2N
C) 10N	D) 6N

Answer & Explanation Answer: B) 2N

Explanation:

Weight is mass x g. Since mass is constant and g is only ${\frac{1}{6}}^{t h}$ of that on the earth. The weight on the moon is only ${\frac{1}{6}}^{t h}$ of that on the earth.

Therefore 2N i.e (b) is the answer.

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Filed Under: Physics
Exam Prep: AIEEE

Q:

A boy is swinging a ball attached to a string in a horizontal circle.If the string snaps

A) the ball will travel towards the center of the circle and fall down	B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
C) it will fall down at the same place where the string breaks	D) none of these

Answer & Explanation Answer: B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down

Explanation:

The centripetal force having been removed the body cannot execute the curved path. (B) is Correct.

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Q:

In the case of bodies falling under gravity which of the following remains constant at a given place?

A) Kinetic energy	B) Potential energy
C) acceleration	D) all the above

Answer & Explanation Answer: C) acceleration

Explanation:

This acceleeration denoted by letter g varies from place to place. Unless stated otherwise, it can be taken 9.8 m/ $s^{2}$ .

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Filed Under: Physics
Exam Prep: AIEEE

Q:

A cyclist leans inwards when he is negotiating a curve so that

A) he may increase his speed	B) his weight may be reduced
C) necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.	D) no frictional force may be produced between the wheels and the axle

Answer & Explanation Answer: C) necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

Explanation:

No circular or curved motion is possible without providing the necessary centripetal force. (C) provides this and so is the answer.

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Q:

Choose the option which indicates a valid argument containing logically related statements that is, where the third statement is a conclusion drawn from the preceding two statements.

A. Some straight forward things are people

B. All Perennial things are cats

C. Only cats are Perennial

D. All Perennial things are People

E. Some Straight forward things are cats

F. Some Straight forward things are Perennial

A) BCA	B) CFD
C) DFA	D) EAB

Answer & Explanation Answer: C) DFA

Explanation:

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Filed Under: Logic

Q:

Choose the alternative where the third segment in the statement can be logically deduced using both the preceding two, but not just from one of them.

I. All IIMs are in India. No BIMs are in India. No IIMs are BIMs

II. All IIMs are in India. No BIMs are in India .No BIMs are IIMs

III. Some IIMs are not in India. Some BIMs are not in India. Some IIMs are BIMs.

IV. Some IIMs are not in India. Some BIMs are not in India. Some BIMs are IIMs.

A) I Only	B) II Only
C) I and II	D) III and IV

Answer & Explanation Answer: C) I and II

Explanation:

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Filed Under: Logic

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