Free Work MCQs with Answers
169 Work MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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169 questions · page 7 of 9
- A. Parallel
- B. Perpendicular
- C. Anti parallel
- D. None of these
Explanation: When the direction of motion and force acting on body are opposite i.e anti parallel, the work done is said to be negative.
Correct answer: Anti parallel- A. 120 J
- B. 12 J
- C. 1.2 J
- D. 18 J
Explanation: Work done = Force x Distance moved. = 10 x (0.12) = 1.2 J
Correct answer: 1.2 J- A. 10,000 J
- B. -l000 J
- C. 12/31 J
- D. 500 J
Explanation: Work done, W is equal to the force f times the distance d, or W = fd.W = 50 x9.8x 20.W = "9,800 J".
Correct answer: 10,000 J- A. positive
- B. zero
- C. negative
- D. none of these
Explanation: B. The formula for work done on a body is; W = F × d cos θWhere,F = the force of gravitation applied by the earth.d = displacement between…
Correct answer: zero- A. Frictional force
- B. Gravitational force
- C. Centripetal force
- D. Elastic force
Explanation: Option C is correct since centripetal force acts on an object in a circular path. It always acts towards the center of the circular path.
Correct answer: Centripetal force- A. (M/2+m)gh
- B. (M+m)gh/2
- C. (M+ m/2)gh
- D. (M+m)gh
Explanation: Option D is correct since work done by man will be equal to the gravitational potential energy gained by bucket and rope.
Correct answer: (M+m)gh- A. 20 J
- B. 15 J
- C. 5 J
- D. 25 J
Explanation: The work done by the force F can be calculated using the formula W = ∫F.dy, where ∫F.dy represents the integral of the force F with…
Correct answer: 25 J- A. Reversible
- B. Non reversible
- C. Can be both
- D. None of them
Explanation: Remember that the work done by a conservative force is reversible.
Correct answer: Reversible- A. applied force is variable
- B. applied force is perpendicular to the motion
- C. applied force generated motion
- D. applied force is constant
Explanation: Work is equal to the product of force and displacement. So, work is only done by the applied force when this force produces motion.
Correct answer: applied force generated motion130. A force F = 7 - 2x + 3*x2 is applied on 2 kg body, work done to displace the body from x =0 to x=5 m
- A. 70 J
- B. 270 J
- C. 35 J
- D. 135 J
Explanation: To find the work done, we can integrate the force with respect to displacement.
Correct answer: 135 J- A. Negative
- B. Positive
- C. Zero
- D. Maybe positive, maybe negative
Explanation: Option D is correct since students must note that generally friction is considered to be a dissipative force in nature that generally acts…
Correct answer: Maybe positive, maybe negative- A. 0.5 J
- B. 1 J
- C. 2 J
- D. 1.5 J
Explanation: To calculate the work done by a force, we can use the formula: Work = Force × Displacement × cos(θ) In this case, the force is given by F…
Correct answer: 2 J133. Work is a _.
- A. Vector quantity
- B. Scalar quantity
- C. Sometime scalar some time vector
- D. None of these
Explanation: Work is given as; W = F × d Work is the product of Force, and displacement, both of which are vectors.
Correct answer: Scalar quantity- A. Friction is zero
- B. Contact force is zero
- C. Gravity is zero
- D. All of these
Explanation: Since mg and N are perpendicular to velocity v and s, work done by these force is zero.
Correct answer: All of these- A. Negative
- B. Zero
- C. Positive
- D. None of these
Explanation: Correct Option:CThis option is correct because in case of horse and cart the applied force and the direction of displacement is same that…
Correct answer: Positive- A. 9J
- B. 0J
- C. -9J
- D. 20J
Explanation: Correct Option:CAs the force is given as,F=2i+3j+4kThe displacement d with initial point (x1,y1z1) and terminal point…
Correct answer: -9J- A. 50J
- B. 20J
- C. 22J
- D. 10J
Explanation: The work done is calculated using the formula: Work = Force x Distance x Cosine(angle)As the force is applied in the horizontal direction…
Correct answer: 20J138. A variable force F = x is applied what will be the work done in moving the particle from X= 0 to 1
- A. 2 J
- B. 1 J
- C. 0.5 J
- D. 5 J
Explanation: The work done in moving a particle from x=0 to x=1 when a variable force F=x is applied can be found by integrating the force over the…
Correct answer: 0.5 J- A. Can be zero
- B. Can be positive
- C. Can be negative
- D. All of these options are correct
Explanation: Work done by friction is always negative.
Correct answer: Can be negative- A. 75˚
- B. 60˚
- C. 45˚
- D. 30˚
Explanation: Option B is correct since we know that, W = FS cosθ Cosθ = W / FS Cosθ = 25 / 50 Cosθ = 1 / 2 θ = 60 Options A, C, and D are incorrect…
Correct answer: 60˚