Free Kinetic Energy MCQs with Answers
57 Kinetic Energy MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Kinetic energy is the energy of motion, given for a nonrelativistic object by K = ½mv², so it depends on mass and the square of speed. Questions connect kinetic energy with work through the work energy theorem, calculate changes in kinetic energy, and distinguish it from momentum and potential energy.
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- A. mass is halved
- B. speed is doubled
- C. speed is increased by a factor of the square root of two
- D. mass is doubled and speed halved
Explanation: Kinetic energy is half m v squared, so it scales with the square of the speed.
Correct answer: speed is increased by a factor of the square root of two- A. 10 J
- B. 20 J
- C. 40 J
- D. 80 J
Explanation: Kinetic energy is half times 5 times 4 squared, which is half times 5 times 16, giving 40 J.
Correct answer: 40 J- A. mv
- B. half mv squared
- C. mv squared
- D. half mv
Explanation: Because the speed is squared, doubling it quadruples the kinetic energy, which is why stopping distances grow so sharply with speed.
Correct answer: half mv squared- A. double
- B. four times
- C. half
- D. unchanged
Explanation: Kinetic energy depends on the square of the speed, so a factor of two in speed gives a factor of four in energy, and the braking distance…
Correct answer: four times- A. 5 m per second
- B. 10 m per second
- C. 50 m per second
- D. 100 m per second
Explanation: From half mv squared equal to 50, v squared is 100 and v is 10 m per second.
Correct answer: 10 m per second- A. P/2m
- B. P2/2m
- C. 1/2 Pm2
- D. 1/2 P2m
Explanation: Kinetic energy is half mv squared and momentum is mv, so substituting v equal to P over m gives half m multiplied by P squared over m…
Correct answer: P2/2m- A. 9 J
- B. 18 J
- C. 6 J
- D. 3 J
Explanation: Kinetic energy is half mv squared, so half multiplied by 0.5 multiplied by 36 gives 9 J.
Correct answer: 9 J- A. Twice
- B. Thrice
- C. Four times
- D. Sixteen times
Explanation: For a fixed mass, kinetic energy is K = p²/(2m), so it depends on the square of momentum.
Correct answer: Four times- A. K.E hoop = K.E disc
- B. K.E hoop = 2K.E disc
- C. K.E hoop = 1/2K.E disc
- D. K.E hoop = 4K.E disc
Explanation: Rotational kinetic energy is 1/2 Iω². For the same mass and radius, a hoop has I = MR² while a disc has I = 1/2 MR², so K.E hoop = 2K.E…
Correct answer: K.E hoop = 2K.E disc- A. its K.E is doubled
- B. its acceleration is doubled
- C. its P.E is doubled
- D. its momentum is doubled
Explanation: Momentum is p = mv, so doubling the speed while keeping mass constant doubles the momentum.
Correct answer: its momentum is doubled- A. momentum increases 4 times and K.E increases 2 times
- B. momentum and K.E. remain same
- C. momentum increases 2 times and K.E increases constant
- D. momentum increases 2 times and K.E increases 4 time
Explanation: Momentum is p = mv, so doubling velocity doubles momentum. Kinetic energy is K.E.
Correct answer: momentum increases 2 times and K.E increases 4 time- A. Proton
- B. electron
- C. neutron
- D. a-particle
Explanation: For equal momentum, kinetic energy is K.E. = p²/(2m), so the particle with the smallest mass has the greatest kinetic energy.
Correct answer: electron- A. Disc
- B. Loop
- C. Sphere
- D. All have the same speed
Explanation: The sphere has most of its mass near the axis of rotation, so it will have the smallest moment of inertia and will reach the ground…
Correct answer: Sphere- A. 2 J
- B. 4 J
- C. 8 J
- D. 16 J
Explanation: K.E = 1/2 m Δv2 = 1/2 m (Vf2 - Vi2)K.E = 1/2 x 1 x (22 - 62)K.E = 0.5 x (-32) = -16JNeglect the negative sign.
Correct answer: 16 J- A. 490 J
- B. 98 J
- C. 49 J
- D. 980 J
Explanation: Gain in K.E = Loss in Gravitational P.EK.E= mg(h1 - h2)= (1)(9.8)(50 - 40) = 9.8(10) = 98 J
Correct answer: 98 J16. If a stone of mass 500g is dropped from height 20m then kinetic energy while hitting the ground is :
- A. 10 J
- B. 40 J
- C. 75 J
- D. 100 J
Explanation: As the potential energy of an object at the highest point converts into KE while going downhence, KE=mgh 500g=0.5kg =0.5*10*20 =100
Correct answer: 100 J- A. Mass 3M and speed v
- B. Mass 2M and speed 3v
- C. Mass 3M and speed 2v
- D. Mass M and speed 4V
Explanation: K.E = 1/2Mv2The K.E will be maximum when the product of "M" and "v²" is maximum. In (B) the product has maximum value i.e. 9Mv².
Correct answer: Mass 2M and speed 3v- A. 10 J
- B. 40 J
- C. 75 J
- D. 100 J
Explanation: K.E = 1/2 mv2 = 1/2 (500 x 10-3) (20)2 =200/2 =100J
Correct answer: 100 J- A. Quartered
- B. One third
- C. Twice
- D. Remain same
Explanation: Option d) Remain same is the correct option. When the speed of an object is halved and the mass is quadrupled, the kinetic energy remains…
Correct answer: Remain same- A. 17 m s-1
- B. 21 m s-1
- C. 25 m s-1
- D. 10 m s-1
Explanation: To determine the speed of the vehicle when it covers a distance of 30 m, we can use Newton's second law of motion:F = ma In this case, the…
Correct answer: 21 m s-1Kinetic Energy MCQs: common questions
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