471. According to the work-energy principle, work done on the body is equal to:
A. Change in power
B. Change in K.E
C. Change in acceleration
D. Change in angular velocity
472. The weight of the body at the center of the earth is:
A. 9.8 N
B. Zero
C. 19.6 N
D. None of these
473. The energy stored in a dam is:
A. Kinetic energy
B. Electrical energy
C. Potential energy
D. None of these
474. The work done by the body is maximum when the angle between force and displacement is:
A. 30 Degree
B. 60 Degree
C. 90 Degree
D. 0 Degree
475. Under the influence of a force of 5 Newton, a body travels 10 meters in a straight line. Assuming the work wear is 25 joules, the point which the power takes with the heading of movement of the body is:
A. 0 Degree
B. 30 Degree
C. 60 Degree
D. 90 Degree
476. A Second pendulum mounted in a rocket, its period of oscillation decreases when the rocket (A pendulum having a time period of 2 seconds is called a second pendulum)
A. Comes down with uniform acceleration
B. Is in a geostationary orbit that revolves around the earth
C. Moves up with uniform velocity
D. Moves up with uniform acceleration
477. A person A is going up in a balloon while another person is going down into a mine. Both are measuring the gravitational field.
A. The field that both A and B measure continues to grow.
B. The field measure by A increases while that measured by B decreases
C. The field measured by A decreases while that measured by B decreases
D. While the field measured by B grows, the field measured by A shrinks.
478. 11 km/s is the escape velocity from the earth’s surface. The mean density of a particular planet is the same as that of Earth, despite having a radius twice that of Earth. The following would be the value of the escape velocity from this planet:
A. 22 KM/S
B. 11 KM/S
C. 14 KM/S
D. 13 KM/S
479. Reactances of a 52 mH inductor and a 76 µF capacitor at equal __ frequency.
(A) 40 Hz
B) 80 Hz
(C) 125 Hz
(D) 180 Hz
480. A pendulum has a time period of 3.0s in an inertial frame. What is the time period when measured by an observer moving with a speed of 0.95c with respect to the pendulum?
(A) 2.85 s
(B) 3.32 s
(C) 6.64 s
D) 9.60 s
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