A particle is acted upon by a force of a constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that ___________
a) Its velocity is constant and kinetic energy is constant
b) Its acceleration and velocity is constant
c) Its kinetic energy is constant and it moves in a circular path
d) Its acceleration is constant and it moves in a circular path
Q.3.
An athlete in the Olympic game covers a distance ofin 10s. His kinetic energy can be estimated in the range?
a) 200J – 500J
b) 2×105J – 3×105J
c) 20000J – 50000J
d) 2000J – 5000J
Q.4.
A particle of massis thrown vertically upwards with a speed of 5m/s. The work done by the force of gravity during the time the particle goes up is ___________
a) 1.25J
b) 0.5J
c) -0.5J
d) -1.25J
Q.5.
StatementLinear momentum of a system of particles is zero.
a) 1 does not imply 2 and 2 does not imply 1
b) 1 implies 2 but 2 does not imply 1
c) 1 does not imply 2 but 2 implies 1
d) 1 implies 2 and 2 implies 1
Q.6.
A spherical ball of mass 20kg is stationary at the top of a hill of height 100m. It rolls down a smooth surface to the ground, then climbs up another hill of heightand finally rolls done to a horizontal base at a height ofabove the ground. The velocity attained by the ball is ___________
a) 10m/s
b) 10√30m/s
c) 40m/s
d) 20m/s
Q.7.
If mass-energy equivalence is taken into account when water is cooled to form ice, the mass of water should ___________
a) Increase
b) Remain unchanged
c) Decrease
d) First increase and then decrease
Q.8.
A body moves a distance ofunder the action of force F = 10N. If the work done isJ, the angle which the force makes with the direction of motion is?
a) 0°
b) 30°
c) 60°
d) None of the mentioned
Q.9.
Two bodies of mass andhave equal kinetic energy. What is the ratio of their momentum?
a) 1:4
b) 1:2
c) 1:1
d) 2:1
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