# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 239 - 243 of 268

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## Question number: 239

MCQ▾

### Question

A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observed that water enters into the hollow sphere at a depth of 60 cm below the surface. Surface tension of water is. The diameter of the hole is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 240

MCQ▾

### Question

A 30 g bullet passes through a plate of mass 1 kg and finally comes to rest inside another plate of mass 2970 g. It makes the plates move from rest to same velocity. The percentage loss in velocity of bullet between the plates is –

### Choices

Choice (4) Response

a.

50%

b.

0

c.

75%

d.

25%

## Question number: 241

MCQ▾

### Question

An equilateral triangle is formed by three identical uniform rods each of length L and mass M. The moment of inertia of the system about an axis passing through one corner is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 242

MCQ▾

### Question

When ultraviolet radiation of a certain frequency falls on a potassium target, the photoelectrons released can be stopped completely by a retarding potential of 0.9 V. If the frequency of the radiation is increased by 15%, this stopping potential rises to 1.2 V. The work function of potassium is –

### Choices

Choice (4) Response

a.

2.0 eV

b.

1.5 eV

c.

2.8 eV

d.

1.1 eV

## Question number: 243

MCQ▾

### Question

A sound wave passing through air at NTP produces a pressure of 0.002dyne/cm2 during a compression. The corresponding change in temperature (given 𝛾 = 1.5 and assume gas to be ideal) is –

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

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