GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 009

GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 009

81). A ball tied with a string to a rotating shaft revolve at uniform speed. As the shaft is suddenly brought to rest the string starts getting round the shaft with the angular velocity of the ball
A). increasing
B). decreasing
C). remaining constant
D). becoming zero

Answer: increasing


   
82). One finds it more difficult to walk on ice than on a concrete road because
A). ice is soft and spongy whereas concrete is hard
B). the friction between the ice and the feet is less than that between the concrete and the feet
C). there is more friction on ice than on concrete
D). none of these

Answer: the friction between the ice and the feet is less than that between the concrete and the feet


   
83). It is easier to roll a barrel than to pull it because
A). the full weight of the barrel comes into play when it is pulled
B). rolling friction is much less than sliding friction
C). the surface area of the barrel in contact with the road is more in the case of pulling
D). of a reason other than those mentioned

Answer: rolling friction is much less than sliding friction


   
84). A sheet of paper can be pulled out quickly from under a glass of water without spilling the water. This phenomenon illustrates
A). lack of friction between paper and glass
B). Newton's third law of motion
C). inertia
D). acceleration

Answer: inertia


   
85). A horse pulling a tonga moves forward due to the force exerted by
A). the tonga on the horse
B). the horse on the tonga
C). the horse on the ground with his feet
D). the ground on the horse's feet

Answer: the ground on the horse's feet



86). When the velocity of a body is doubled, its
A). acceleration is doubled
B). momentum is doubled
C). kinetic energy is doubled
D). potential energy is doubled

Answer: momentum is doubled


   
87). If two bodies, one heavy and one light, are acted upon by the same force for the same time, then both bodies acquire the
A). same velocity
B). same momentum
C). same acceleration
D). none of these

Answer: same momentum


   
88). The work done in holding a weight of 20 kg at a height of 1 m above the ground is
A). zero
B). 20 J
C). 200 J
D). none of these

Answer: zero

   
89). When the speed of a body is doubled, its kinetic energy becomes
A). double
B). half
C). quadruple
D). one-fourth

Answer: quadruple


   
90). Winding a watch is actually the process of storing
A). electrical energy
B). pressure energy
C). kinetic energy
D). potential energy

Answer: potential energy