The magnetic field is produced by:
A. moving protons.
B. stationary protons.
C. stationary electrons.
D. moving electrons.
Slight gaps are intentionally left between blocks of a building:
A. to drain water accumulated on the roof.
B. to avoid cracks due to temperature impacts.
C. to allow light to internal of room.
D. None of them.
If the distance between two bodies each 1 Kg is 1 meter, then the force of attraction between these two bodies is:
A. 9 x 109 N
B. 3 x 10-11 N
C. 6.67 x 10-11 N
D. 8.8 x 10-12 N
White light does not converge on a single point after passing through convex because of:
A. chromatic aberration.
B. spherical aberration.
C. distortion.
D. both spherical and chromatic aberration.
A pendulum of length L has a period T. If the period is doubled, the length of the pendulum is:
A. doubled
B. halved
C. quadrupled
D. increased by 2
If volume of a given mass of a gas is doubled without changing its temperature, the density of the gas:
A. is doubled.
B. remains unchanged.
C. is halved.
D. is reduced to 1/4 of the original value.
How much average force should be applied to 2500 Kg car, having velocity of 30 m/s, in order to stop the in 15 seconds?
A. 1000 N
B. 6000 N
C. 5000 N
D. 8000 N
Graphite is used in the nuclear reactors for specific purpose that is:
A. to absorb neutrons.
B. to slow down neutrons.
C. to absorb alpha particles.
D. to slow down high speed electron.
If velocity of 11 x 103 m/s is needed to escape a rocket from gravitational pull, how much velocity will be needed to escape a cricket ball?
A. 11 x 106 m/s
B. 11 x 105 m/s
C. 11 x 104 m/s
D. 11 x 103 m/s
A body is projected with high velocity at 45o (angle) with ground, which falls after 15 seconds, its horizontal component of velocity during its motion will:
A. increase.
B. decrease.
C. remain constant.
D. first decrease then increase.
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