# Classical Mechanics-Special Theory of Relativity (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 1 - 4 of 19

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## Question number: 1

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

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Appeared in Year: 2013

MCQ▾

### Question

The area of a disc in its rest frame S is equal to 1 (in some units). The disc will appear distorted to an observer O moving with a speed u with respect to S along the plane of the disc. The area of the disc measured in the rest frame of the observer O is (c is the speed of light in vacuum) (June)

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 2

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

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Appeared in Year: 2012

MCQ▾

### Question

Three particle of equal mass m are connected by two identical mass less springs of stiffness constant k as shown in figure –

If denote the horizontal displacements of the masses from their respective equilibrium position, the potential energy of the system is – (December)

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 3

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

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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.

60 s

b.

0 s

c.

20 s

d.

40 s

## Question number: 4

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

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Appeared in Year: 2012

MCQ▾

### Question

Let denote the speed, the magnitude of momentum, and the energy of a free particle of rest mass m. Then – (December)

### Choices

Choice (4)Response

a.

b.

p = mv

c.

d.

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