# Classical Mechanics-Special Theory of Relativity (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 11 - 15 of 19

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## Question number: 11

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2012

MCQ▾

### Question

What is the proper time interval between the occurrences of two events if in one inertial frame the events are separated by and occurs apart? (June)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 12

» Classical Mechanics » Special Theory of Relativity » Mass-Energy Equivalence

Appeared in Year: 2011

MCQ▾

### Question

The minimum energy of an electron (the rest mass of which is 0.5 MeV) that can emit Cerenkov radiation while passing through water (of refractive index 1.5) is approximately – (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 13

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2011

MCQ▾

### Question

Two gravitating bodies A and B with masses and , respectively, are moving I circular orbit. Assume that and let the radius of the orbit of body A be . If the body A is losing mass adiabatically, its orbital radius is proportional to –

(June)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 14

» Classical Mechanics » Special Theory of Relativity » Mass-Energy Equivalence

Appeared in Year: 2011

MCQ▾

### Question

An atom of mass M can be excited to a state of mass by photon capture. The frequency of a photon which can cause this transition is – (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 15

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2011

MCQ▾

### Question

A planet of mass m moves in the inverse square central force field of the Sun of mass M. If the semi – major and semi – minor axes of the orbit are and , respectively, the total energy of the planet is: (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

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