# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 56 - 59 of 268

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## Question number: 56

Appeared in Year: 2012

MCQ▾

### Question

A cylindrical steel rod of length 0.10 m and thermal conductivity 50 Wm-1K-1 is welded end to end to copper rod of thermal conductivity 400 Wm-1K-1 and of the same area of cross section but 0.20 m long. The free end of the steel rod is maintained at 1000C and that of the copper rod at 00C. Assuming that the rods are perfectly insulated from the surrounding the temperature at the junction of the two rods is

### Choices

Choice (4) Response

a.

500 C

b.

200 C

c.

400 C

d.

300 C

## Question number: 57

Appeared in Year: 2012

MCQ▾

### Question

A radioactive nucleus A has a single decay mode with half-life 𝜏A. Another radioactive nucleus B has two decay modes 1 and 2. If decay mode 2 were absent, the half-life of B would have been. If decay mode 1 were absent, the half – life of B would have been. If the actual half – life of B is , then the ratio is –

### Choices

Choice (4) Response

a.

b.

1

c.

d.

## Question number: 58

Appeared in Year: 2011

MCQ▾

### Question

The Quantum Hall Resistance RH is a fundamental constant with dimensions of resistance. If h is Planck’s constant and e the electron charge, then the dimension of RH is the same as -

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 59

Appeared in Year: 2011

MCQ▾

### Question

One mole of an ideal gas at initial temperature T, undergoes a quasi-static process during which the volume V is doubled. During the process the internal energy U obeys the equation, where a is a constant. The work done during this process is

### Choices

Choice (4) Response

a.

b.

c.

d.

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