# CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 92 - 96 of 463

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## Question number: 92

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2012

MCQ▾

### Question

Two events, separated by a (special) distance, are simultaneous in one inertial frame. The time interval between these two events in a frame moving with a constant speed (where the speed of light) is – (June)

### Choices

Choice (4) Response

a.

40 s

b.

60 s

c.

20 s

d.

0 s

## Question number: 93

Appeared in Year: 2012

MCQ▾

### Question

Given the usual canonical commutation relation, the commutator of and is - (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 94

Appeared in Year: 2014

MCQ▾

### Question

Consider the differential equation

With the initial conditions and. The solution attains its maximum value when is – (June)

### Choices

Choice (4) Response

a.

b.

2

c.

1

d.

## Question number: 95

Appeared in Year: 2014

MCQ▾

### Question

Let and denote, respectively, the coordinate and momentum operators satisfying the canonical commutation relation in natural units. Then the commutator is – (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 96

Appeared in Year: 2012

MCQ▾

### Question

The wave function of a state of the hydrogen atom is given by,

Where, is the normalized eigen function of the state with quantum numbers n, l and m in the usual notation. The expectation value of is the state is – (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

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