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MCQ for Class 9 Science Chapter 9 Force and Laws of Motion
Class 9 Science students should refer to the following multiple-choice questions with answers for Chapter 9 Force and Laws of Motion in Class 9.
Chapter 9 Force and Laws of Motion MCQ Questions Class 9 Science with Answers
Question: In the following example, try to identify the number of times the velocity of ball changes - A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team.
(a) Five times
(b) Three times
(c) Four times
(d) Six times
Answer : B
Question: There will be a change in the speed or in the direction of motion of a body when it is acted upon by
(a) An Unbalanced force
(b) Balanced Force
(c) Uniform force
(d) Zero Force
Answer : A
Question: A hammer of mass 500 g, moving at 50m/s, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. The force of the nail on the hammer is
(a) 3500N
(b) 1000N
(c) 2500N
(d) 500N
Answer : C
Question: The action and reaction forces referred to in the third law
(a) Must act on different objects
(b) Must act on the same objec
(c) May act on different objects
(d) Need not be equal in magnitude but act in the same direction
Answer : A
Question: An object will continue to accelerate until the
(a) Resultant force begins to decrease
(b) The velocity changes direction
(c) Resultant force on it is increased continuously
(d) Resultant force on it is zero
Answer : D
Question: Qualitative definition of Force is given by
(a) Newtons first law of motion
(b) Newtons Second law of motion
(c) Newtons third law of motion
(d) Newtons law of gravitation
Answer : A
Question: The object shown below moves with constant velocity. Two forces are acting on the object. Considering negligible friction , the resultant force will be
(a) 17 N leftwards
(b) 7N rightwards
(c) 3 N leftwards
(d) 10 N leftwards
Answer : C
Question: Type of inertia that tends to resist the change in case of an -Athlete often jumps before taking a long jump
(a) Inertia of motion
(b) Inertia of rest
(c) Inertia of direction
(d) Uniformly accelerated motion
Answer : A
Question: A passenger in a moving train tosses a coin which falls
(a) Behind him
(b) In front of him
(c) Falls outside the train
(d) Will not move
Answer : A
Question: A bullet of mass 20gm is fired from a gun of mass 8kg with a velocity of 400 m/s, calculate the recoil velocity of gun
(a) -2m/s
(b) 1m/s
(c) 2m/s
(d) -1m/s
Answer : D
Question: Rocket works on the principle of conservation of
(a) Energy
(b) Mass
(c) momentum
(d) velocity
Answer : C
Question: An object of mass 2 kg is sliding with a constant velocity of 4 m/ s on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
(a) 8N
(b) 2N
(c) 32N
(d) 0 N
Answer : D
Question: Inertia is a measure of
(a) Mass
(b) velocity
(c) Force
(d) acceleration
Answer : A
Question: Formula to find the Force is
(a) F= ma
(b) F= m/a
(c) F= a/m
(d) a=Fm
Answer : A
Question: Force required in accelerating a 2 kg mass at 5 m/s2 and a 4 kg mass at 2 m/s2
(a) 2kg mass at 5m/s2 is less than 4 kg mass at 2 m/s2
(b) Same in both the cases
(c) 2kg mass at 5m/s2 is greater than 4 kg mass at 2 m/s2
(d) Zero in both the cases
Answer : C
Question.. If a bus starts suddenly, the passengers in the bus will tend to fall
(a) In the direction opposite to the direction of motion of bus.
(b) In the same direction as the direction of motion of bus.
(c) Sideways.
(d) None of the above.
Answer : A
Question. Which of the following is the unit of linear momentum?
(a) kg m/s
(b) kg ms
(c) kgms−2
(d) kg
Answer : B
Question. A plate, a ball and a child all have the same mass. The one having more inertia is the
(a) plate
(b) ball
(c) child
(d) All have equal inertia
Answer : D
Question. Inertia is a property of a body by virtue of which the body is
(a) Unable to change by itself the state of rest.
(b) Unable to change by itself the state of uniform motion in a straight line.
(c) Unable to change by itself the direction of motion.
(d) Unable to change by itself the state of rest or uniform motion in a straight line.
Answer : D
Question. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to:
(a) Exert large force on the ball
(b) Increases the force exerted by the ball on hands
(c) Increase the rate of change of momentum
(d) Decrease the rate of change of momentum
Answer : D
Question. The acceleration of an object is
(a) inversely proportional to its mass
(b) directly proportional to the applied force
(c) resisted by inertia
(d) all of the above
Answer : D
Question.: An object will continue to accelerate until
(a) The resultant force begins to decrease.
(b) The resultant force on it is zero.
(c) The velocity changes direction.
(d) The resultant force on it is increased continuously.
Answer : B
Question. The S.I. unit of force is
(a) Newton-metre
(b) Newton
(c) Newton per second
(d) Newton per square metre
Answer : B
Question.. Rate of change of momentum is equal to
(a) Acceleration
(b) Work done
(c) Force
(d) Impulse
Answer : C
Question. The action and reaction forces referred to in the third law
(a) Must act on the same object.
(b) May act on different objects.
(c) Must act on different objects.
(d) Need not be equal in magnitude but must have the same direction.
Answer : C
Question. If an object moves with a uniform velocity we can conclude that
(a) there is no force acting on the body
(b) no unbalanced force acts on it
(c) an unbalanced force acts on the body
(d) it has uniform acceleration
Answer : B
Question. When a force is exerted on an object, it can change its:
(a) State
(b) Position
(c) Shape
(d) All the above
Answer : D
Question . Rocket works on the principle of conservation of
(a) velocity
(b) Mass
(c) Linear Momentum
(d) Energy
Answer : C
Question. The seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and saved from getting injured. Can you guess the law due to which a person falls in forward direction on the sudden stopping of the car?
(a) Newton’s first law of motion
(b) Newton’s second law of motion
(c) Newton’s third law of motion
(d) Newton’s law of gravitation
Answer : A
Question. Two equal masses m each moving in the opposite direction with the same speed v collide and stick to each other. The velocity of the combined mass is
(a) v
(b) 2v
(c) v/2
(d) zero
Answer : D
Question. When unbalanced forces act on a body, the body:
(a) Must move with uniform velocity
(b) Must remain at rest
(c) Must experience acceleration
(d) Must move in a curved path
Answer : C
Question. A passenger in a moving train tosses a coin which falls behind him. Observing this statement what can you say about the motion of the train?
(a) Accelerated
(b) Retarded
(c) Along circular tracks
(d) Uniform
Answer : A
Question. An object of mass 20 kg is moving with a velocity of 10 m/s. Its momentum will be:
(a) 2000 kg.m/s
(b) 20 kg.m/s
(c) 2 kg.m/s
(d) 200 kg.m/s
Answer : D
Question. When a 12 N force acts on 3 kg mass for a second, the change in velocity is (in m/s)
(a) 36
(b) 4
(c) 2
(d) 18
Answer : B
Question. The acceleration of an object is
(a) inversely proportional to its mass
(b) directly proportional to the applied force
(c) resisted by inertia
(d) all of the above
Answer : D
(a) 0 Newton
(b) 2 Newtons
(c) 8 Newtons
(d) 32 Newtons
Question. A man wearing a bullet-proof vest stands on roller skates. The total mass is 80 kg. A bullet of mass 20 g is fired at 400 m/s. It is stopped by the vest and falls to the ground. What is then the velocity of the man?
(a) 1 m/s
(b) 0.1 m/s
(c) 0.01 m/s
(d) 0 m/s
Answer: B
Question. Acceleration acts always in the direction __________
(a) of the displacement
(b) of the initial velocity
(c) of the net force
(d) of the final velocity
Answer: C
Question. Which of the following situations involves the Newton’s second law of motion?
(a) A force can stop a lighter vehicle as well as a heavier vehicle which are moving
(b) A force exerted by a lighter vehicle on collision with a heavier vehicle results in both the (vehicles coming to a standstill
(c) A force can accelerate a lighter vehicle more easily than a heavier vehicle which are moving
(d) A force exerted by the escaping air from a balloon in the downward direction makes the balloon to go upwards
Answer: C
Question. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to:
(a) Exert large force on the ball
(b) Increases the force exerted by the ball on hands
(c) Increase the rate of change of momentum
(d) Decrease the rate of change of momentum.
Answer: D
Question. Essential characteristic of equilibrium is
(a) K. E equals zero
(b) acceleration equals zero
(c) momentum equals zero
(d) none of the above
Answer: B
Question. What is the momentum of a body of mass 2m and velocity v/2?
(a) mv/4
(b) mv
(c) 2mv
(d) mv/2
Answer: B
Question. A mass M breaks into two pieces in the ratio 1 : 3 while at rest. If the heavier has a speed of v, the speed of the lighter is
(a) v
(b) 2v
(c) 3v
(d) 4v
Answer: C
Question. Change in momentum when a car weighing 700kg changes its speed from 100m/s to 200 m/s is:
(a) 14000 kg.m/s
(b) 10500000 kg.m/s
(c) 21000000 kg.m/s
(d) 70000 kg.m/s
Answer: D
Question. The inertia of an object tends to cause the object ______.
(a) to increase its speed.
(b) to decrease its speed.
(c) to resist any change in the state of rest or of motion.
(d) to decelerate due to friction.
Answer: C
Question. Frictional force
(a) always in the opposite director of motion
(b) always opposes motion of a body
(c) always opposes relative motion between the surfaces of contact
(d) always in the direction of motion
Answer: C
Question: A body of weight W is suspended from the ceiling of a room through a rope of weight R. The ceiling pulls the rope by a force of
(a) W
(b) R
(c) W + R
(d) (W+R)/2
Answer: C
Question. Rocket works on the principle of conservation of:
(a) mass
(b) energy
(c) momentum
(d) velocity
Answer: C
Question. Friction is:
(a) useful to us
(b) harmful to us
(c) both useful as well as harmful to us
(d) none of them.
Answer: C
Question. A carpenter exerts a force of magnitude 1.5 N at right angles to the surface of a nail of mass 3 gram to drive it into the wood. If wood offers a resistive force of 0.6 N and the time of interaction of hammer and the nail 0.01 s, the depth through which the nail penetrates is
(a) 15m
(b) 1.5 cm
(c) 15 cm
(d) 1.5 mm
Answer: B
Question. A gun of mass 5kg fires 50gm bullet with a velocity of 200m/s. Find the recoils velocity of the gun.
(a) -2 m/s
(b) 20 m/s
(c) Zero
(d) 0.2m/s
Answer: A
Question. When no external force acts on an object, the physical quantity that remains conserved is______.
(a) velocity
(b) momentum
(c) acceleration
(d) force
Answer: B
Question. A unit of force is
(a) Joule – m
(b) Joule
(c) Newton – m
(d) Kg ms−2
Answer: D
Question. __________ is a force, which always opposes the motion of one body over the other body in contact with it
(a) Gravitational force
(b) Reaction force
(c) Normal force
(d) Frictional force
Answer: D
Question. Essential characteristic of equilibrium is
(a) K. E equals zero
(b) acceleration equals zero
(c) momentum equals zero
(d) none of the above
Answer: B
Question. The relation between acceleration, mass and force is given by:
(a) a x F = m
(b) F = m/a
(c) F x m = a
(d) a = F/m
Answer: D
Question. Which of the following has the largest momentum?
(a) A cat running down the street
(b) A pickup truck travelling down the highway.
(c) A large truck parked in a parking lot.
(d) A car parked in a parking lot.
Answer: B
Question. The acceleration of an object is
(a) inversely proportional to its mass
(b) directly proportional to the applied force
(c) resisted by inertia
(d) all of the above
Answer: D
Question. A mass M breaks into two pieces in the ratio 1 : 3 while at rest. If the heavier has a speed of v, the speed of the lighter is
(a) v
(b) 2v
(c) 3v
(d) 4v
Answer: C
Question. A plate, a ball and a child all have the same mass. The one having more inertia is the
(a) plate
(b) ball
(c) child
(d) All have equal inertia
Answer: A
Question. When a force is exerted on an object, it can change its:
(a) State
(b) Position
(c) Shape
(d) All the above
Answer: D
Question. When a bus starts suddenly from rest, the passengers sitting inside the bus move backwards. This illustrates an example of
(a) Newton First Law of Motion
(b) Newton Second Law of Motion
(c) Newtons Third Law of Motion
(d) None of these
Answer: A
GAS LAWS
Question. The correct equation for Boyle's law is :-
(a) d2p/p = -dV/dT
(b) d2p/p + d2V/dT
(c) dp/p = -dV/dT
(d) dp/p = +dV/dT
Answer: A
Question. Under which of the following conditions, Van der Waal's gas approaches ideal behaviour ?
(a) Extremely low pressure
(b) High pressure
(c) Low product of PV
(d) Low temperature
Answer: A
Question. A gas behaves like an ideal gas under conditions of
(a) High pressure and low temperature
(b) High temperature and high pressure
(c) Low pressure and high temperature
(d) Low pressure and low temperature
Answer: A
Question. When the temperature is raised, the viscosity of the liquid decreases.
This is because
(a) Attraction between the molecules increases
(b) Covalent and hydrogen bond forces decrease
(c) Volume of the solution decreases
(d) Increase in temperature increases the average kinetic energy of the molecules which over-comesthe attractive force between them
Answer: D
Question. Which of the following gases has the lowest average speed at 25°C ?
(a) NH3
(b) O2
(c) CH4
(d) H2S
Answer: D
Question. If the four tubes of a car are filled to the same pressure with N2, O2, H2 and Ne separately, then which one will be filled first ?
(a) O2
(b) H2
(c) Ne
(d) N2
Answer: B
Question. An ideal gas expands according to PV = constant. On expansion,the temperature of gas
(a) will rise
(b) will drop
(c) will remain constant
(d) cannot be determined because the external pressure is not known
Answer: C
Question. Some assumptions from the kinetic molecular theory are listed below. Which one is most frequently cited to explain Charle's law ?
(a) Collisions of gas particle are elastic and total kinetic energy of the gas is constant
(b) A gas consists of tiny particles moving in random straight line motion
(c) The volume of the particle is negligible compared to the volume of the gas
(d) The average kinetic energy of gas articles is proportional to the Kelvin temperature
Answer: D
Question. Universal gas constant (R) is divided by Avogadro's number (N0) then the value is equivalent to
(a) van der Waal's constant
(b) Rydberg's constant
(c) Planck's constant
(d) Boltzmann's constant
Answer: B
Question. The term that accounts for intermolecular force in van der Waal's equation for non ideal gas is
(a) RT
(b) V – b
(c) (P +α/V2)
(d) (RT)–1
Answer: C
Question. According to the kinetic energy of gases, in an ideal gas, between two successive collisions a gas molecules travels
(a) in a circular path
(b) in a wavy path
(c) in a straight line path
(d) with an accelerated velocity
Answer: C
Question. The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called
(a) Critical temperature
(b) Boyle temperature
(c) Inversion temperature
(d) Reduced temperature
Answer: B
Question. A real gas at a very high pressure occupies
(a) Less volume then that of an ideal gas under identical condition
(b) More volume than that of an ideal gas under identical conditions
(c) Same volume than that of an ideal gas under identical conditions
(d) Cannot be predicted
Answer: B
Question. Temperature according to kinetic theory, is a measure of
(a) Average translational kinetic energy of gas molecules
(b) Intermolecular attraction
(c) Intermolecular distances
(d) Volume f gas
Answer: A
Question. A gas deviates from ideal behaviour at a high pressure because its molecules
(a) Show the Tyndall effect
(b) Have kinetic energy
(c) Attract one another
(d) Are bound by covalent bonds
Answer: C
Question. Which statement about real gases is true ?
(a) Forces of attraction and repulsion exist between gas particles as close range
(b) The behaviour of real gases can be exactly predicted usig the ideal gas law
(c) The volume of the gas particle is zero
(d) The mass of the gas particles is zero
Answer: A
Question. It is easter to liquefy oxygen than hydrogen because
(a) Oxygen has a higher critical temperature and a higher inversion temperature than hydrogen
(b) The critical temperature and inversion temperature of oxygen is very low
(c) Oxygen has a higher critical temperature and lower inversion temperature than hydrogen
(d) Oxygen has a lower critical temperature and higher inversion temperature than hydrogen
Answer: A
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MCQs for Chapter 9 Force and Laws of Motion Science Class 9
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