Physics Class 10 MCQ Points Term 1, Session 2021-2022
1) The laws of reflection hold true for all reflecting surfaces.
2) Concave mirror as well as convex lens can make a parallel beam of light when light from a point source is incident on it.
3) When an object is placed at a distance 2f from a convex lens then the height of the image formed is same size as the object.
4) Refractive index have no units.
5) The refractive index is ratio of two similar quantities.
6) Magnification produced by a rear view fitted in vehicles is less than one.
7) Focal length of plane mirror is at infinity.
8) In torches, search lights and headlights of vehicles the bulb is placed very near to the focus of the reflector.
9) Red color is least deviated on passing through a prism.
10) During sunset or sunrise the sun appears reddish because the light from the Sun travels through earth's atmosphere it undergoes scattering before it reaches us.
11) Object should be placed at C or 2F in front of concave mirror so that the image and object are of the same size.
12) The angle between the direction of incident ray and the emergent ray is called the angle of deviation.
13) Linear magnification has no unit since it is the ratio of the height of the image to the height of the object.
14) In optics an object which has higher refractive index is called optically denser.
15) The unit of power of lens is diopter.
16) Red color is least scattered by fog, dust of smoke.
17) The ray of light splits when passed through a prism because each part of the light have their individual wavelength, each of these colors have their velocity, here they come out of the prism at different times and angles.
18) Planets do not twinkle because the planets are closer, they appear larger in comparison to the stars, hence the shift is not enough for the planets do not twinkle.
19) The sky appears blue on a clear day because of scattering of blue component of white sunlight by air molecules present in the atmosphere.
20) Danger signals are red in color because the red color is scattered least by air, water or dust molecules.
21) Splitting of visible light into its component color is called dispersion.
22) Dispersion of light is caused by the change of speed of light ray (resulting in angle of deviation) of each wavelength by a different amount.
23) White light comprises of seven visible colors (VIBGYOR) whereas black(or dark) signifies the absence of light rays.
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