Free Force and Motion MCQs with Answers
1,416 Force and Motion MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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- A. Electromagnetic Force
- B. Gravitational Force
- C. Centripetal Force
- D. Nuclear Force
Explanation: The mutual force produced by the masses of two bodies is gravitational force, described by Newton's law of gravitation.
Correct answer: Gravitational Force- A. More than the true weight
- B. More or less the true weight
- C. Less than the true weight
- D. Equal to the true weight
Explanation: For an upward-accelerating lift, Newton's second law gives N − mg = ma, so the apparent weight is N = m(g + a), which is greater than the…
Correct answer: More than the true weight- A. a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
- B. an un-accelerated frame of reference is called an inertial frame of reference
- C. all the frames of reference in uniform rectilinear motion are equivalent
- D. Newtons laws of motion are valid in an accelerated (non inertial) frame of reference
Explanation: An inertial frame is unaccelerated, so it is either at rest or moving with constant velocity, and all uniformly moving frames are…
Correct answer: Newtons laws of motion are valid in an accelerated (non inertial) frame of reference- A. 9.8 N
- B. 19.6 N
- C. 129.4 N
- D. 39.2 N
Explanation: For an elevator accelerating upward, the apparent weight is the normal reaction N = m(g + a).
Correct answer: 39.2 N- A. Einstein
- B. Galileo
- C. Newtons
- D. Plank
Explanation: Newton formulated the inverse-square law of gravitation, F = Gm1m2/r2, which states that gravitational force decreases with the square of…
Correct answer: Newtons- A. mg
- B. mg - ma
- C. mg + ma
- D. mg - ma
Explanation: For an elevator accelerating upward, the floor must provide extra upward force, so the apparent weight is N = m(g + a), written as mg +…
Correct answer: mg + ma- A. MLT-1
- B. MLT-2
- C. ML-1T
- D. ML-1T-2
Explanation: Newton’s second law gives F = ma, so force has dimensions M × LT^-2 = MLT^-2.
Correct answer: MLT-2108. The fission chain reaction in a nuclear reactor can be controlled by introducing _______________?
- A. Iron rods
- B. Graphite rods
- C. Cadmium rods
- D. Platinum rods
Explanation: Cadmium rods absorb neutrons, so inserting them into a reactor reduces the number of neutrons available to cause further fission and…
Correct answer: Cadmium rods- A. at rest
- B. moving slowly
- C. move with high velocity
- D. move with velocity comparable to velocity of light
Explanation: Newtonian mechanics is a classical approximation and becomes inaccurate when a particle's speed is comparable to the speed of light…
Correct answer: move with velocity comparable to velocity of light- A. 1st law
- B. 2nd law
- C. 3rd law
- D. all 1st, 2nd and 3rd laws
Explanation: Newton's first law states that an object remains at rest or continues with uniform velocity unless acted on by a net external force…
Correct answer: 1st law- A. force
- B. impulse
- C. velocity
- D. both A and C
Explanation: Newton's second law states that force is the time rate of change of momentum: F = Δp/Δt, measured in newtons when momentum is in kg m/s…
Correct answer: force- A. second law of motion
- B. third law of motion
- C. first law of motion
- D. law of gravitation
Explanation: A rocket moves forward by ejecting gases backward, so the gases exert an equal and opposite thrust on the rocket according to Newton's…
Correct answer: third law of motion- A. Centripetal force
- B. Gravitational force
- C. Their inertia
- D. Centrifugal force
Explanation: Passengers tend to continue moving in a straight line when the car turns, because of their inertia.
Correct answer: Centrifugal force- A. force, displacement
- B. force, velocity
- C. force, acceleration
- D. force, momentum
Explanation: Newton's second law gives F_net = ma, so the net force and acceleration have the same direction when the force is nonzero.
Correct answer: force, acceleration- A. effect of force
- B. existence of a force
- C. existence of two forces
- D. existence of pair of forces in nature
Explanation: Newton's third law states that forces occur in equal and opposite pairs between interacting bodies.
Correct answer: existence of pair of forces in nature- A. inertia
- B. motion
- C. velocity
- D. force
Explanation: Newton's first law says that a body remains at rest or in uniform straight-line motion unless acted upon by an external unbalanced force.
Correct answer: inertia- A. volume
- B. density
- C. mass
- D. temperature
Explanation: Inertia is the resistance of an object to any change in its state of motion, and this resistance increases with mass.
Correct answer: mass- A. biology
- B. physics
- C. information technology
- D. chemistry
Explanation: Physics is called a fundamental science because its laws describe basic properties of matter, energy, space and time and support many…
Correct answer: physics- A. Decrease
- B. increase
- C. Remains same
- D. None of these
Explanation: While a projectile rises, gravity acts downward and reduces its upward vertical velocity according to vy = uy - gt, where velocity is…
Correct answer: Decrease- A. Zero
- B. E/2
- C. E
- D. E/(2)1/2
Explanation: At 45°, the initial horizontal speed is v cos45° and the vertical speed is v sin45°.
Correct answer: E/2