1. In which of the following will a piece of iron weigh most?
in air
in an atmosphere of oxygen
in an atmosphere of CO₂
in vacuum
in vacuum
2. A man jumping out of a moving train is thrown
forward
backward
sideways
None of the above
forward
3. The principle on which a jet engine works is
conservation of mass
Newtonian law of action and reaction
conservation of angular momentum
None of the above
Newtonian law of action and reaction
4. It is easier to climb down a staircase than climb up because in climbing down
work is done against gravity
the steepness of the staircase isn't felt
gravity assists
there is no friction between the legs and steps
gravity assists
5. A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is
greater than the weight of the man
less than the weight of the man
same as the weight of the man
zero
greater than the weight of the man
6. Which physical quantity is measured in watts?
power
kinetic energy
momentum
impulse
power
7. The theory that the earth constituted the centre of the universe around which the sun and the planets revolved was propounded by
Copernicus
Ptolemy
Newton
Kepler
Ptolemy
8. It is more difficult to walk on ice than on a concrete road because
there is very little friction between the ice and feet pressing it
ice is soft when compared to concrete
there is more friction between the ice and feet
None of the above
there is very little friction between the ice and feet pressing it
9. When the velocity of a body is halved
its momentum is halved
its kinetic energy is halved
its acceleration is halved
its potential energy is halved
its momentum is halved
10. The inability of a body to change its state of rest or uniform motion along a straight line is called its
momentum
velocity
acceleration
inertia
inertia
11. When a bullet is fired from a gun
the gun moves forward
the gun jumps up
the gun does not move
the gun recoils with the same momentum as the bullet
the gun recoils with the same momentum as the bullet
12. Choose the scalar quantity from the following physical quantities
force
velocity
acceleration
speed
speed
13. If you want to open a door with less difficulty, you push it
at the middle
at a point away from the hinge (near the rim)
near the hinge
None of the above
at a point away from the hinge (near the rim)
14. A body has fallen from a height. Just before touching the ground, it has
lost all its potential energy and gained an equivalent amount of kinetic energy
gained potential energy and lost kinetic energy
gained kinetic energy as well as potential energy
lost kinetic energy as well as potential energy
lost all its potential energy and gained an equivalent amount of kinetic energy
15. When a swing is drawn to a side, its potential energy in relation to the earth
increases
decreases
remains the same
is constant
increases
16. The sun continuously produces an enormous amount of energy. This is due to
nuclear fission
nuclear fusion
chemical combustion
boiling
nuclear fusion
17. The unit of power in SI is
Joule
Newton
Joule/Sec
Erg/Sec
Joule/Sec
18. Where does the centre of gravity of a rubber ring lie?
on the outer surface
in the inner surface
at the centre of the ring
None of the above
at the centre of the ring
19. If an empty cylinder is half filled with a liquid, its centre of gravity is
shifted upwards
shifted downwards
shifted neither upward nor downward
shifted upward or downward depending on the density of the liquid
shifted downwards
20. Who discovered that the acceleration due to gravity is the same for any object at a given place?
Newton
Pascal
Archimedes
Galileo
Galileo
21. A stationary elevated object has
kinetic energy
potential energy
momentum
both potential and kinetic energy
potential energy
22. A light year means
a unit of length
a unit of time
a year of no consequence
illumination throughout the year
a unit of length
23. An astronomical unit of distance is
a kilometre
light year
the average distance from the earth to the sun
None of the above
light year
24. What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?
9.8 km/sec
11.2 km/sec
25 km/sec
35 km/sec
11.2 km/sec
25. The motion of the pendulum of a wall clock is an example of
vibratory motion
linear motion
rotational motion
None of the above
vibratory motion
26. The weight of a body is
maximum at the equator
minimum at the poles
the same everywhere
minimum at the equator
minimum at the equator
27. Chronometer is an instrument to measure
heat
electric potential
time
distance between two points
time
28. In the case of bodies falling under gravity, which of the following remains constant at a given place?
kinetic energy
potential energy
acceleration
All the above
acceleration
29. A projectile is fired at an angle with the horizontal with a small velocity. Its horizontal range will be maximum when the angle with the horizontal is
0°
30°
45°
60°
45°
30. A bullet is fired at a certain angle with the horizontal. Its path will be
