10th Class Physics MCQS Chapter 3

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10th Class Physics MCQS


Astronauts in space need to communicate with each other by radio links because:
Sound waves travel very slowly in space
Sound waves have low frequency in space
Sound waves travel very fast in space
Sound waves cannot travel in space

The mirror whose outer surface is reflecting is called:
Lens
Concave mirror
Convex mirror
Mirror

The focal length is related to radius of curvature by the formula:
R = f/2
f = R/2
f = 4R
f = 2R

Sun light consist of ____________ colour
5
7
6
2

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90o is called:
angle of incidence
None of these
critical angle
angle of refrection

The data stored in C.D is:
700 MB
750 MB
650 MB
680 MB

Spherical mirrors are used in:
All of these
Microscope
Medical
Search light

An object is placed 6 cm away in front of a concave mirror that has 10 cm focal length. Determine the location of the image:
10 cm
-15 cm
20 cm
5 cm

The point through which rays of light pass after reflection from concave mirror is called principal:
Radius
Focus
Axis
Circle

Critical angle for diamond is:
26o
49o
60o
24o

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