# 10th Class Physics MCQS Chapter 3

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How does sound travel from its source to your ear:
By electromagnetic waves
By infrared waves
By changes in air pressure
By vibration in wires or strings

Which types of image is produced by the converging lens of human eye if it view a distant object?
Virtual, inverted, magnified
Virtual, erect,diminshed
Real , erect, same size
Real, inverted, diminshed

Half of radius of curvature is called:
None of these
Principal focus
Focal length
Axis

The S.I unit of power of a lens is:
Volt
Dioptre
Ampere
Watt

A normal eye can see near objects clearly at a distance of:
25 cm
20 cm
30 cm
35 cm

Bouncing back of light after striking the surface is called:
Reflection
Interference
Diffraction
Refraction

Which is an example of a longitudinal wave:
Light wave
Sound wave
Water wave

The refractive index of air is:
6
10,003
7
2

The ratio of image height to object height is called:
Power
Refraction
Linear magnification