# KVPY Stream-SA (Class 11) Physics: Questions 79 - 82 of 252

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## Question number: 79

MCQ▾

### Question

A small metal ball is pushed from a height h along smooth hemispherical glass cup. If the height of the cup is R, the speed required to push it such that it just reaches the top of the opposite end of the cup is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 80

Appeared in Year: 2014

MCQ▾

### Question

A charged particle, initially at rest at O, when released follows a trajectory as shown. Such a trajectory is possible in the presence of,

### Choices

Choice (4) Response

a.

Electric field of constant magnitude and constant direction

b.

Electric field of constant magnitude and varying direction

c.

Electric and magnetic fields of constant magnitudes and constant directions which are parallel to each other.

d.

Magnetic field of constant magnitude and varying direction

## Question number: 81

Appeared in Year: 2014

MCQ▾

### Question

Ice is used in a cooler in order to cool its contents. Which of the following will speed up the cooling process?

### Choices

Choice (4) Response

a.

Drain the water from the cooler periodically

b.

Put the ice as a single block

c.

Wrap the ice in a metal foil

d.

Crush the ice

## Question number: 82

Appeared in Year: 2013

MCQ▾

### Question

Two skaters P and Q are skating towards each other. Skater P throws a ball towards Q every 5 s such that it always leaves her hand with speed 2 ms-1 with respect to the ground. Consider two cases:

(I) P runs with speed 1 ms-1 towards Q while Q remains stationary

(II) Q runs with speed 1 ms-1 towards P while P remains stationary.

Note that irrespective of speed of P, ball always leaves P’s hand with speed 2 ms-1 with respect to the ground. Ignore gravity. Balls will be received by Q.

### Choices

Choice (4) Response

a.

One every 2.5 s in case (I) and one every 2.5 s in case (II)

b.

One every 2 s in case (I) and one every 4 s in case (II)

c.

One every 3.3 s in case (I) and one every 2.5 s in case (II)

d.

One every 2.5 s in case (I) and one every 3.3 s in case (II)

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