11th class (Fsc) Physics unit 4 MCQs
26. Escape velocity on the surface of earth is 11.2 kms-1 the escape velocity on the surface of another planet of same mass as that of earth but of times of the radius of the earth is:
a. 22.4 kms-1
b. 5.6 kms-1
c. 44.8 kms-1
d. 11.2 kms-1
27. Energy stored in spring is:
a. K.E
b. Elastic P.E
c. Chemical P.E
d. Gravitational P.E
28. The ratio maximum orbital velocity and escape velocity is:
a. 72:1
b. 1:√2
c. 4:1
d. 2:1
29. If velocity V of an object is double, then K.E becomes:
a. Four times
b. Double
c. Sixteen times
d. Remain same
30. The K.E of bullet of mass 500gm moving at a speed of 200ms-1
a. 2500 J
b. 250 J
c. 10,000 J
d. 125 J
31. A body of mass 1.0kg dropped from the top of tower of height 50m, what will be its K.E 10m below the top?
a. 2500 J
b. 250 J
c. 10,000 J
d. 125 J
32. A stone of mass 2kg is dropped from the top of a tower of height 40m. What will be its K.E 10m below the top?
a. 600 J
b. 19.6 J
c. 196 J
d. 1960 J
33. A body of mass 2 kg moving with velocity of 4 ms-1 has K.E equal to:
a. 32 J
b. 6 J
c. 2 J
d. 18 J
34. The formula for the speed of satellite orbiting around the earth is:
a. V = √gr
b. V = √2gr
c. V = √gR/M
d. √2gR
35. The value of escape velocity is:
a. 11.5 x 103ms-1
b. 11.6 x 103ms-1
c. 12 x 103ms-1
d. 11 x 103ms-1
36. For freely falling body, in the presence of force of friction the:
a. Loss in P.E > gain in K.E
b. Loss in P.E = gain in K.E
c. Loss in P.E = 0
d. Loss in P.E < gain in K.E
37. When speed of a body is doubled then its:
a. Acceleration is doubled
b. K.E is doubled
c. Momentum is doubled
d. P.E is doubled
38. Which one is renewable source of energy?
a. Biomass
b. Coal
c. Natural gas
d. Uranium
39. The numerical value of solar constant is given by:
a. 1.6 kWm-2
b. 1 kWm-2
c. 2 kWm-2
d. 1.4 kWm-2
40. The unit of solar light inversely is:
a. Watt kWm-2
b. Watt
c. j,m-2
d. kWm-2
41. Biomass is converted into fuel by:
a. Reflection
b. Evaporation
c. Scattering
d. Fermentation
42. Hot igneous rocks usually in molten or partly molten state are found in the depth of:
a. 15 km
b. 5 km
c. 20 km
d. 10 km
43. Which one is non-renewable source of energy:
a. Tides
b. Hydroelectric
c. Oil
d. Biomass
44. Which one is non-renewable source of energy?
a. Coal
b. Wind
c. Sunlight
d. Biomass
45. The original source of tidal energy is:
a. Sun
b. Moon
c. Sea
d. Earth
46. A layer of rock holding water that allows water to percolate through it with pressure is called:
a. Streamvent
b. Geyser
c. Hot spring
d. Aquifer
47. Which one is Biofuel:
a. Ethanol
b. Water
c. Oil
d. Petrol
48. Value of solar constant is:
a. 1.0 kw ms-2
b. 1.4 kw ms-2
c. 0.1 kw ms-2
d. 1.0 kw ms-2
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