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Q:

A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan

A) increases B) decreases
C) remains the same D) first increases and then decreases

Answer:   C) remains the same

Explanation:

Before transferring the fish, the position is the man with the fish and the bucket of water. After transferring the position is : the man without the fish, but the fish inside the water in the bucket. Thus to know whether there is any change in weight, it is enough to consider whether there is any change in weight when the fish in air is transferred into the water. The answer is there is no change as when in water though it loses weight due to upthrust of water on it, the level of water increases and exerts an equal force at the bottom

Subject: Physics
Q:

A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?

A) Depends on their masses B) Sphere
C) Disk D) Both reach at the same time
 
Answer & Explanation Answer: B) Sphere

Explanation:

Time does not depend on mass, else

  => is least for 'sphere' and

hence least time is taken by sphere.

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Q:

A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :

A) 3:4 B) 5:4
C) 5:1 D) 3:2
 
Answer & Explanation Answer: D) 3:2

Explanation:

In series : E1 + E2 = K(50)

In parallel : E1 - E2 = K(10)

E1 + E2 / E1 - E2 = 5/1

=> E1/E2 = 3/2

The emf's are in the ratio of 3:2.

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Q:

What is the maximum velocity with which a body of mass 'm' must enter a vertical loop of radius 'R'so that it can complete the loop ?

A)    B) gR   C)    D)   

A) A B) B
C) C D) D
 
Answer & Explanation Answer: C) C

Explanation:

To complete the vertical loop, the minimum speed required at the lowest point  =  .

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Q:

Which of the following group of elements are diamagnetic ?

A) Argon, copper, silver B) Hydrogen, argon, copper
C) Oxygen, copper, silver D) Hydrogen, oxygen, Argon
 
Answer & Explanation Answer: A) Argon, copper, silver

Explanation:
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Q:

At the Curie temperature, the ferromagnetic materials get converted into

A) Diamagnetic materials B) Non-magnetic materials
C) Paramagnetic materials D) None of the others
 
Answer & Explanation Answer: C) Paramagnetic materials

Explanation:
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