# Work Done by Variable Force MCQs for NEET

NEET  Physics is the scoring paper in the medical entrance examination. Here, you will discover the NEET Physics MCQ Questions for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Physics objective questions on air pollution and improve your subject knowledge & problem-solving skills along with time management. NEET Physics Work Done by Variable Force Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high.

## MCQ on Work Done by Variable Force

1. There are two springs with the force constant as k1 and k2 (k1＞k2). They are stretched by the same force then
(a) More work is done in the first spring
(b) In both springs equal work is done
(c) In the second spring, more work is done
(d) No work is done in both the springs

Answer: (c) More work is done in case of the second spring

2. A spring with an initial stretch of  0.20 m has a force constant 10 N/m. When the stretch is changed to 0.25 m, the increase in potential energy is
(a) 0.2 joule
(b) 0.3 joule
(c) 0.1 joule
(d) 0.5 joule

3. Same force is used to stretch two springs of spring constants 1500 N/m and 3000 N/m respectively. What will be the ratio of potential energy?
(a) 1:4
(b) 2:1
(c) 4:1
(d) 1:2

4. What will be the work done in stretching the  spring through 40 mm if 10 N force is required to stretch the spring through 1 mm
(a) 68 J
(b) 23 J
(c) 84 J
(d) 8 J

5. A body moving with a velocity 10 m/s and having a mass 0.1 kg hits a spring (fixed at the other end) of force constant 1000 N/m and comes to rest after compressing the spring. What will be the value of compression of the spring?
(a) 0.1 m
(b) 0.2 m
(c) 0.01 m
(d) 0.5 m

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

7. 100 J of energy is stored by a spring when it is stretched by 2 cm. If it is stretched further by 2 cm, the stored energy will be increased by
(a) 100 J
(b) 200 J
(c) 300 J
(d) 400 J

8. The potential energy is 4 J for spring when it is stretched by 2 mm. If it is stretched by 10 mm, its potential energy is equal to
(a) 4 J
(b) 54 J
(c) 415 J
(d) 100 J

9. What would be the maximum compression of the spring if a mass of 0.5 kg moving on a horizontal smooth surface with a speed of 1.5 m/s  collides with a nearly weightless spring of force constant k= 5 N/m.
(a) 0.5 m
(b) 0.12 m
(c) 1.5 m
(d) 0.15 m