# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 134 - 137 of 268

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## Question number: 134

Appeared in Year: 2014

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 0.6 V. If the frequency of the radiation is increased by 10%, this stopping potential rises to 0.9 V. The work function of potassium is

### Choices

Choice (4) Response

a.

2.0 eV

b.

2.8 eV

c.

3.0 eV

d.

2.4 eV

## Question number: 135

MCQ▾

### Question

Two rods, one made of Aluminum and the other copper of the same length and across sectional area are joined together. (The thermal conductivity of copper is and aluminum is ). If the copper end is held at 1300 C and the aluminum end is held at 50 C, what is the junction temperature (assuming no other heat losses)?

### Choices

Choice (4) Response

a.

55.60 C

b.

86.60 C

c.

1000 C

d.

88.70 C

## Question number: 136

Appeared in Year: 2015

MCQ▾

### Question

The dimension of the area A of a black hole can be written in terms of the universal gravitational constant G, its mass M and the speed of light c as . Here,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 137

Appeared in Year: 2013

MCQ▾

### Question

A solid sphere rolls without slipping, first horizontal and then up to a point X at height h on an inclined plane before rolling down, as shown.

The initial horizontal speed of the sphere is

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page