Q1: Newton's first law of motion describes the following Q8: The acceleration of 5 kg mass in the below given
arrangement is
(1) Energy (2) Work (3) Inertia (4) Moment of inertia
(1) 2 m/s2 (2) 4 m/s2
Q2: When a bus suddenly takes a turn, the passengers are (3) 1 m/s2 (4) 3 m/s2
thrown outwards because of
(1) Inertia of motion (2) Acceleration of motion
Q9: Why a person can swin in rivver can be explained by
(3) Speed of motion (4) Both (b) and (c)
the help of
Q3: A force of 10 Newton acts on a body of mass 20kg (1) First law (2) second law
for 10 seconds. Change in its momentum is (3) Third law (4) Inertia
(1) 5 kg m/s (2) 100 kg m/s
Q10: When an external force is not applied to the system,
(3) 200 kg m/s (4) 1000 kg m/s
its total momentum
Q4; When the speed of a moving body is doubled (1) Becomes zero (2) Remains constant
(3) Increases gradually (4) Decreases gradually
(1) Its acceleration is doubled
(2) Its momentum is doubled Q11: : In equilibrium condition the net force on a body is
(3) Its kinetic energy is doubled always equal to?
(4) Its potential energy is doubled (1) 1 (2) 2
(3) 0 (4) NOT
Q5: Three blocks with masses m, 2m and 3m are
Connected by strings, as shown in the figure.
After an upward force F is applied on block m, Q12: Working of rocket or jet is based on: -
the masses move upward at constant speed v.
What is the net force on the block of mass 2m? (1) Newton's law (2) Newton's II law
(g is the acceleration due to gravity) (3) Newton's III law (4) All the three laws
,
(1) 6 mg Q13: A car accelerates on a horizontal road due to the
(2) zero force exerted by: -
(3) 2 mg (1) the engine of the car (2) the driver of the car
(4) 3 mg (3) the car on earth (4) the road on the car
Q14: The figure shows a horizontal force acting on a block
Q6: Two blocks of masses 5 kg and 10 kg are connected to of mass M on an inclined plane (angle ). What is
a pulley as shown. What will be their acceleration if
the normal reaction on the block? F
the pulley is set free ? (g = acceleration due to
gravity)
(1) g (2) g/2
(3) g/3 (4) g/4
Q15: A 10 kg mass is accelerated from rest to 30 m/s in 2
Q7: The ratio of weights of a man in a stationary lift and in s. What force acts on it :-
a lift accelerating downwards with a uniform
acceleration is 3 : 2. The acceleration of the lift is:- (1) 300 N (2) 150 N (3) 75 N (4) 600 N
(1)g/3 (2) g/2 (3) g (4)4g/3
Q20: A rider on horse falls back when horse starts
Q16: A force of 20 N acts on a body of mass 10 kg for 20 running, al of a sudden because :-
seconds. The change in its momentum is
(1) 40 kg-m/s (2) 100 kg-m/s (1) rider is taken back
(3) 400 kg-m/s (4) 200 kg-m/s (2) rider is suddenly afraid of failing
(3) inertia of rest keeps the upper part of body at rest while
Q17: Which is the type of inertia? lower part of the body moves forward with the horse.
(4) none of the these
(1) Inertia of rest
(2) Inertia of motion
(3) Inertia of direction Q21:- Two forces of 6N ang 3N are acting on the two
(4) All the above options blocks of 2 kg and 1 kg kept on frictionless floor.
What is the force exerted on 2 kg block by 1 kg
Q18: Motion can only be happen by : block ?
(1) 1 N
(1) Internal force (2) external force (2) 2 N
(3) 4 N
(3) both (40 NOT (4) 5 N
Q19: Which figure represents the correct F.B.D. of rod of Q22:- Two blocks of masses 10 kg and 5 kg are connected
mass m as shown in figure :- from a massless string as shown in figure. The
system is pulled up with a force of 210 N, then the
acceleration of the system is :-
(1) 2 14m/ s
(2) 2 11m/ s
(3) 2 4m/s
(4) zero
Q23: In the fig. given below masses m and m' are tied with
a thread passing over pulley, m' is on a frictionless
horizontal surface. If acceleration due to gravity is
g, the acceleration of m in this arrangement will be
:-
(1) g
(2) m'g/(m + m')
(3) mg/(m + m')
(4) mg/(m – m')
Q24: Weight is defined as :-
(1) Force of attraction exerted by the earth
(2) Mass of a body
(3) Nature of a body
(4) None of these
Q25: A person of mass 60 kg is inside a lift of mass 940
kg and presses the button on control panel. Then lift
starts moving upwards with an
acceleration 1.0m /s2 . If , the tension in the
supporting cable is : Q29: Ten one rupees coins are put on top of each
( g = 10m/s2 ) other on a table. Each coin has a mass 'm' kg.,
then the force on the 7th coin (counted from the
(1) 8600 N (2) 9680 N (3) 11000 N (4) 1200 N bottom) due to all the coins on its top :-
(1) 3 mg (2) 7 mg (3) 2 mg (4) 5 mg
Q26: Two bodies of mass 4kg and 6kg are tied to the
ends of a massless string. The string passes over
a pulley which is frictionless (see figure). The Q30: A mass of 6 kg is suspended by a rope of length 2 m
acceleration of the system in terms of from a ceiling. A force of 50 N is applied in
acceleration due to gravity (g) is horizontal direction at the mid point of the rope.
What is the angle between the rope and the vertical
in equilibrium :-
Q27: A metal sphere is hung by a string fixed to a wall.
The forces acting on the sphere are shown in fig.
Which of the following statements is correct ?
Q28: Find the tension T2 for the system shown in fig.
(1) 1g N
(2) 2g N
(3) 5g N
(4) 6g N
