Q31. The movement of air from one region to the other creates ___________
[A] lightning
[B] winds
[C] humidity
[D] clouds
Q32. The speed of light will be minimum while passing through
[A] air
[B] vaccum
[C] glass
[D] water
Q33. The base of an electric iron is brightly polished mainly
[A] to reduce heat loss by radiation
[B] to make it more durable
[C] to make it rust-proof
[D] to make it smooth and frictionless
Q34. ____________ is not an example of refraction of light.
[A] Lateral inversion
[B] Mirages
[C] Twinkling effect of stars
[D] Bending of light while passing through a medium
450+ Physics Quiz Questions and Answers
Q35. The working principle of a washing machine is
[A] dialysis
[B] centrifugation
[C] reverse osmosis
[D] diffusion
Q36. Which of the following is not a vector quantity?
[A] 107
[B] 108
[C] 109
[D] 1010
Q37. A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will
[A] decrease
[B] remains the same
[C] increase
[D] first decrease and then increase
Q38. If lift is going up with acceleration, the apparent weight of a body is
[A] more than the true weight
[B] less than the true weight
[C] equal to the true weight
[D] may be more or less than true weight
Q39. Due to atmospheric refraction, sunrise is advanced and sunset is delayed by about
[A] 3 minute
[B] 1 minute
[C] 2 minute
[D] 4 minute
Q40. Where warm air rises up, the air ____________.
[A] humidity at that place is raised
[B] pressure at that place is lowered
[C] humidity at that place is lowered
[D] pressure at that place is raised