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Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

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1,831.

Which of the following actions is necessary in order to tune a string to produce a note of an octave higher than its fundamental?

doucling the length of the string

reducing the tension by half

reducing the mass per unit length

increasing the tension four times

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,832.

In which of the following media would sound wave travel fastest?

wood

water

iron

mercury

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,833.

A travelling microscope is focused on a mark on a table. If a glass block of thickness 18.0cm is placed on the mark, by how many centimeters will the microscope be moved upwards so as to focus the mark once again? [refractive index of glass = 1.5]

27cm

24cm

9cm

6cm

View answer & explanation

Correct answer is D

Apparent depth = $\frac{\text{thickness}}{\text{refractive index}}$

= $\frac{18}{1.5} = 12cm$

Upward adjustment = 18 - 12

= 6cm

1,834.

Which of the following distances is usually adjustable in the camera? The distance between the

lens and the film

diaphragm and the shutter

shutter and the film

diaphragm and the film

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,835.

A ray from a fixed object is incident on a plane mirror at an angle of 20^o. If the mirror is rotated through 30^o by how many degree would the reflected ray rotate?

60^o

50^o

40^o

30^o

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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