Physics TOP 30 MCQs for all exams questions and answers
21. The oldest type of energy known to man is
a) wind power
b) solar power
c) tidal energy
d) geothermal energy
22. Energy that is produced commercially from coal is called
a) Light energy
b) Kinetic energy
c) Thermal energy
d) Potential energy
23. We always see the same face of the moon, because
a) it is smaller than the earth
b) it revolves on its axis in a
c) direction opposite to that of the earth
d) it takes equal time for revolution around the earth and rotation on its own axis
24. Water pipes in hilly areas often burst on a cold frosty night, because
a) the material of which pipes are made contracts due to
b) cold and so breaks
c) water in the pipes freezes and on freezing water expands, so pipes break
d) frost makes the pipes rusty,so they break
25. A parachute descends slowly whereas a stone dropped from
a) the same height falls rapidly,because stone is heavier than parachute
b) special mechanisms are present in parachute
c) a parachute has a larger surface area and air resistance is more
d) None of these
26. Which of the following instruments is used to measure humidity ?
a) Kata Thermometer
b) Anemometer
c) Sling Psychrometer
d) Clinical Thermometer
27. The type of mirrors used in the headlamp of cars is
a) parabolic concave
b) plane
c) spherical convex
d) cylindrical concave
28. For which of the following substances, the resistance decreases with increase in temperature?
a) Pure silicon
b) Copper
c) Nichrome
d) Platinum
29. A solid needle placed horizontally on the surface of the water floats due to
a) capillary action
b) water pressure
c) surface tension of water
d) viscosity of water
30. When hot liquid is poured into a thick glass tumbler, it cracks because glass :
a) is a bad conductor of heat so only inner surface expands
b) has high temperature coefficient of expansion
c) has a very low specific heat
d) has low temperature coefficient of expansion
31. Hydro-electric power is a:
a) non-renewable natural resource
b) a mixture of renewable and non-renewable natural re?source
c) neither renewable nor non renewable resource
d) renewable natural resource
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