Exercise for Physics – Basic Questions up to Class 10 Important for Exams – Must Know Logics Part 4
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34. Match the following
List – I Parameters | List – II Dependence |
---|---|
A. Intensity of light | 1. Properties of the medium |
B. Colour of light | 2. Refractive index of the medium |
C. Velocity of light | 3. Amplitude of light |
D. Propagation of light | 4. Frequency of light |
(a) 2 4 1 3
(b) 3 4 2 1
(c) 3 1 2 4
(d) 4 2 3 1
Ans: (b)
35. The most efficient engine is
(a) petrol
(b) diesel
(c) electric
(d) steam
Ans: (c)
36. Who invented the laser?
(a) Sir Frank whittle
(b) Fred Morrison
(c) Charles H Townes
(d) Seymour Cray
Ans: (c)
37. One astronomical unit is the average distance between
(a) Earth and the Sun
(b) Earth and the Moon
(c) Jupiter and the Sun
(d) Pluto and the Sun
Ans: (a)
38. When iron rusts, its weigh
(a) decreases
(b) increases
(c) shows no change
(d) decreases and then increases
Ans: (b)
39. Sound travels faster in
(a) dry air than in water
(b) wood than in iron
(c) iron than in air
(d) hydrogen than in water
Ans: (c)
40. We cannot see during a fog because of
(a) reflection of light
(b) internal reflection
(c) refraction
(d) scattering of light
Ans: (d)
41. Detergents dissolved in water help in cleaning clothes by
(a) increasing the temperature of water
(b) reacting chemically with dirt
(c) reducing the surface tension by water
(d) dissolving dirt
Ans: (c)
42. A remote control gadget (for TV etc.) has in it
(a) a small electromagnet, which emits electromagnetic waves
(b) a small oscillator that emits electric pulses
(c) a small transmitter that emits infrared signals
(d) None of the above
Ans: (c)
43. In storms, the roofs of some houses are carried away
This is in accordance with
(a) Bernoulli՚s principle
(b) Archimedes՚ principle
(c) Law of inertia
(d) Pascal՚s law
Ans: (a)
44. In Newton՚s third law, the action and reaction forces
1. act on different bodies
2. act on the same body
3. are not always equal
4. are always equal
Choose the correct answer from the codes given below
(a) 1 and 3 (b) 1 and 4
(c) 2 and 4 (d) 2 and 3
Ans: (b)
45. The phenomenon of mirage is due to
(a) increased absorption of light by air at higher temperature
(b) change in refractive index of air with change in temperature
(c) total internal reflection
(d) decreased absorption of light by air at higher temperature
Ans: (c)
46. Which law is involved in the act of cleaning a carpet by beating it with a stick?
(a) First law of motion
(b) Second law of motion
(c) Law of conservation of energy
(d) Law of conservation of mass
Ans: (a)