NEET Physics Work MCQs Set A

Question.  A boy carrying a box on his head is walking on a level road from one place to another is doing no work. This statement is
(a) correct
(b) incorrect
(c) cannot say
(d) partly correct

Answer: A

Question. No work is done if
(a) All of these
(b) force and displacement are mutually perpendicular
(c) force is zero
(d) displacement is zero

Answer: A

Question.  A particle is taken round a circle by application of force. The work done by the force is
(a) Zero
(b) positive non–zero
(c) negative non–zero
(d) None of these

Answer: A

Question.  A man pushes a wall and fails to displace it, he does
(a) no work at all
(b) maximum positive work
(c) positive but not maximum work
(d) negative work

Answer: A

Question. A ball of mass m moves with speed V and strikes a wall having infinite mass and it returns with same speed, then the workdone by the ball on the wall is
(a) zero
(b) mvJ
(c) m/v J
(d) v/m J

Answer: A

Question. Assertion : The work done in moving a body over a closed loop is zero for every force in nature.
Reason : Work done depends on nature of force.
(a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question.  A force acts on a 30 g particle in such a way that the position of the particle as a function of time is given by x = 3t – 4t² + t³, where x is in metres and t is in seconds. The work done during the first 4 seconds is
(a) 576 mJ
(b) 450 mJ
(c) 490 mJ
(d) 530 mJ

Answer: A

Question.  If a motorcyclist skids and stops after covering a distance of 15 m. The stopping force acting on the motorcycle by the road is 100 N, then the work done by the motorcycle on the road is
(a) Zero
(b) 750J
(c) –1500 J
(d) 1500 J

Answer: A

Question.  A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is
(a) zero
(b) positive
(c) negative
(d) None of these

Answer: A

Question.  A spring of spring constant 5 × 10³ N/m is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is
(a) 18.75 J
(b) 25.00 J
(c) 6.25 J
(d) 12.50 J

Answer: A

Question. The position of a particle of mass 4 g, acted upon by a constant force is given by x = 4t² + t, where x is in metre and t in second. The work done during the first 2 seconds is
(a) 576 mJ
(b) 144 mJ
(c) 512 mJ
(d) 128 mJ

Answer: A

Question.  A boy pushes a toy box 2.0 m along the floor by means of a force of 10 N directed downward at an angle of 60º to the horizontal. The work done by the boy is
(a) 10 J
(b) 12 J
(c) 8 J
(d) 6 J

Answer: A

Question.  A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is
(a) 8 J
(b) 32 J
(c) 24 J
(d) 16 J

Answer: A

Question.  A body moves a distance of 10 m along a straight line under the action of a force of 5 newtons. If the work done is 25 joules, the angle which the force makes with the direction of motion of body is
(a) 60º
(b) 90º
(c) 30º
(d) 0º

Answer: A

Question.  A particle is taken round a circle by application of force. The work done by the force is
(a) None of these
(b) positive non–zero
(c) negative non–zero
(d) Both

Answer: A