1. A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle
at the lower elevation than the bird
at a higher elevation than the bird
in the same direction as the bird
vertically upwards
at a higher elevation than the bird
2. The distance between two bodies is halved. Now the force of attraction between them will be
half
one fourth
four times
two times
four times
3. A cyclist leans inwards when he is negotiating a curve so that
he may increase his speed
his weight may be reduced
necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion
no frictional force may be produced between the wheels and the axle
necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion
4. If the speed of the rotation of the earth increases the weight of a body
will increase
will decrease
will have no change
will either increase or decrease
will decrease
5. In a vacuum the following three articles are dropped at the same time and from the same height. Which will reach the ground quicker?
a stone
a piece of wood
a feather
all will reach the ground at the same time
all will reach the ground at the same time
6. Railway tracks are banked on curves so that
the necessary centrifugal force may be obtained from the horizontal component of the weight of the train
the frictional force between the track and the wheels is avoided
the necessary centripetal force may be derived from the horizontal component of the weight of the train
None of these
the necessary centripetal force may be derived from the horizontal component of the weight of the train
7. A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps
the ball will travel towards the centre of the circle and fall down
it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
it will fall down at the same place where the string breaks
None of these
it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
8. The period of oscillation of a simple pendulum depends upon
the mass of its bob
the material of the bob
the amplitude of vibration
acceleration due to the gravity at the site of experiment
acceleration due to the gravity at the site of experiment
9. If a body weighs 12N on the surface of the earth, how much will it weigh on the surface of the moon where acceleration due to gravity is only one sixth of that on earth's surface?
12N
2N
10N
6N
2N
10. On applying a constant force to a mass, It moves with a uniform
velocity
momentum
acceleration
angular velocity
acceleration
11. When a particle in motion is acted upon by a force in a direction perpendicular to the direction of motion, the path followed by the particle will be
a straight line
an ellipse
a circle
a parabola
a parabola
12. When a body Is taken to the poles from the equator, Its weight becomes
greater
less
the same
None of these
greater
13. When a body is projected upwards
the time for the upward journey and downward journey are the same
the upward journey takes more time
the downward journey takes more time
Can’t be said
the time for the upward journey and downward journey are the same
14. Frictional force acts in
the same direction as the motion
the opposite direction of the motion
all the directions
upward direction
the opposite direction of the motion
15. The force that keeps a body In a circular motion is called
the centripetal force
the centrifugal force
the frictional force
All the above
the centripetal force
16. The earth satellite Aryabhatta was put in orbit by India on
October 20, 1978
November 14, 1978
January 26, 1979
April 19, 1975
April 19, 1975
17. The minimum velocity required by a satellite to escape earth's gravitational pull is
18 km/s
11.2 km/s
21 km/s
35 km/s
11.2 km/s
18. When a satellite is in a geostationary orbit the force keeping it in orbit is
zero
the centrifugal force
reaction due to steady burning of fuel
the gravitational pull on the body by the earth is the weight of the body which provides the centripetal force
the gravitational pull on the body by the earth is the weight of the body which provides the centripetal force
19. The period of a geostationary (synchronous) satellite orbiting the earth over the equator is
16 hours
12 hours
20 hours
24 hours
24 hours
20. The escape velocity of a satellite projected from the surface of the earth is independent of
the mass of earth
the mass of the satellite
the radius of the earth
gravitation of the earth
the mass of the satellite
21. When ice melts, its volume
decreases
increases
remains the same until all the ice has melted and then increases
remains the same
increases
22. When water is cooled from 4ºC to 2ºC its density
increases
decreases
remains the same
first increases then decreases
decreases
23. When a steel ball is placed on the surface of mercury, it does not sink because
of the surface tension of mercury
mercury is a semi-solid
of the high viscosity of mercury
the density of mercury is greater than that of steel
the density of mercury is greater than that of steel
24. A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will
first rise and then fall
fall
remain the same
rise
remain the same
25. A person does not sink in the Dead Sea because
the sea contains a large amount of other salts besides sodium chloride
the density of the person is less than the density of the Dead Sea water
of the surface tension due to salt water in the Dead Sea
of difference in mass
the density of the person is less than the density of the Dead Sea water
26. A ship sailing from a river to the sea
sinks less in the sea
sinks more in the sea
neither sinks more nor less in the sea
sinking more or less depends on sea
sinks less in the sea
27. When a body is partly or wholly immersed in a liquid the apparent loss of weight is equal to the weight of the liquid displaced by the submerged portion. This is known as
Pascal's law
Bernoulli's law
Archimedes' law
Boyle's law
Archimedes' law
28. A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance
will increase
will decrease
does not change
varies with the increase of depth of the immersion of the iron piece
will increase
29. A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will
