# Classical Mechanics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 7 - 9 of 69

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## Question number: 7

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

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: 8

» Classical Mechanics » Periodic Motion » Normal Modes

Appeared in Year: 2013

MCQ▾

### Question

The acceleration due to gravity g is determined by measuring the time period T and the length L of a simple pendulum. If the uncertainties in the measurements of T and L are and respectively, the fractional error in measuring is best approximated by, (June)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 9

» Classical Mechanics » Periodic Motion » Small Oscillations

Appeared in Year: 2014

MCQ▾

### Question

The time period of a simple pendulum under the influence of the acceleration due to gravity is T. The bob is subjected to an additional acceleration of magnitude in the horizontal direction. Assuming small oscillations, the mean position and time period of oscillation, respectively, of the bob will be – (June)

### Choices

Choice (4) Response

a.

to the vertical and

b.

to the vertical and

c.

to the vertical and

d.

to the vertical and

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