# Important Physics MCQS For CSS PMS PPSC FPSC NTS SET 14

Read important Physics MCQS For Exam.These physics  General Knowledge Mcqs Contain  of World Geography, Atmosphere, Science & Literature, events Mcqs, Current Affairs Mcqs , Pakistan Affairs Mcqs and International Organizations. These general knowledge questions are very important for all type of exams conducted by Fpsc, Nts, Kppsc, Ppsc, Spsc, Bpsc, Ots, Uts, Pts, Cts, Ats, etea and other testing agencies of Pakistan

##### Note: The bold option is the right answer for the given MCQ’S:

1. A 0.50-kg object moves on a horizontal circular track with a radius of 2.5 m. An external force
of 3.0 N, always tangent to the track, causes the object to speed up as it goes around. If it
starts from rest its speed at the end of one revolution is:
A. 9.8 m/s
B. 14 m/s
C. 15 m/s
D. 19 m/s
E. 21 m/s

2. A 0.50-kg object moves on a horizontal frictionless circular track with a radius of 2.5 m. An
external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes
around. If it starts from rest, then at the end of one revolution the radial component of the
force of the track on it is:
A. 19 N
B. 38 N
C. 47 N
D. 75 N
E. 96 N

3. A 2-kg block is attached to a horizonal ideal spring with a spring constant of 200 N/m. When
the spring has its equilibrium length the block is given a speed of 5 m/s. What is the maximum
elongation of the spring?
A. 0
B. 0.05 m
C. 5 m
D. 10 m
E. 100 m

4. At time t = 0 a particle starts moving along the x axis. If its kinetic energy increases uniformly
with t the net force acting on it must be:
A. constant
B. proportional to t
C. inversely proportional to t
D. proportional to √t
E. proportional to 1/√t

5. At time t = 0 a 2-kg particle has a velocity of (4 m/s)ˆi − (3 m/s)ˆj. At t = 3 s its velocity is
(2 m/s)ˆi + (3 m/s)ˆj. During this time the work done on it was:
A. 4 J
B. −4 J
C. −12 J
D. −40 J
E. (4 J)ˆi + (36 J)ˆj

6. A particle starts from rest at time t = 0 and moves along the x axis. If the net force on it is
proportional to t, its kinetic energy is proportional to:
A. t
B. t
C. t4
D. 1/t2
E. none of the above

7. A 1.5-kg crate falls from a height of 2.0 m onto an industrial spring scale with a spring constant
of 1.5 × 105 N/m. At its greatest compression the reading on the scale is:
A. 15 N
B. 30 N
C. 1.5 × 103 N
D. 2.1 × 103 N
E. 3.0 × 103 N

8. A particle moving along the x axis is acted upon by a single force F = F0e−kx, where F0 and
k are constants. The particle is released from rest at x = 0. It will attain a maximum kinetic
energy of:
A. F0/k
B. F0/ek
C. kF0
D. 1/2(kF0)2
E. kekF0

9. The mechanical advantage of any machine is:
A. the efficiency of the machine
B. the work done by the machine
C. the ratio of the work done by the machine to the work expended on it
D. the ratio of the force exerted by the machine to the force applied to it
E. the ratio of the force applied to the machine to the force exerted by it

10. In raising an object to a given height by means of an inclined plane, as compared with raising
the object vertically, there is a reduction in:
A. work required
B. distance pushed
C. friction
D. force required
E. value of the acceleration due to gravity

11. A watt is:
A. kg · m/s
B. kg · m2/s
C. kg · m2/s
D. kg · m/s
E. kg · m2/s

12. Power has the dimensions of:
A. ML2/T2
B. MT/L2
C. ML/T2
D. ML2/T3
E. none of these

13. Which of the following five units represents a quantity that is NOT the same as the other four?
A. joule
B. erg
C. watt
D. foot·pound
E. newton·meter

14. Which of the following five quantities is NOT an expression for energy? Here m is a mass,
g is the acceleration due to gravity, h and d are distances, F is a force, v is a speed, a is an
acceleration, P is power, and t is time.
A. mgh
B. F d
C. 1/2mv2
D. ma
E. P t

15. A watt·second is a unit of:
A. force
B. power
C. displacement
D. speed
E. energy

16. A watt per hour is a unit of:
A. energy
B. power
C. force
D. acceleration
E. none of these

17. A kilowatt·hour is a unit of:
A. power
B. energy/time
C. work
D. power/time
E. force/distance

18. A woman lifts a barbell 2.0 m in 5.0 s. If she lifts it the same distance in 10 s, the work done
by her is:
A. four times as great
B. two times as great
C. the same
D. half as great
E. one-fourth as great

19. A person holds an 80-N weight 2 m above the floor for 30 seconds. The power required to do
this is:
A. 80W
B. 40W
C. 20W
D. 10W
E. none of these

20. A 50-N force is the only force on a 2-kg object that starts from rest. When the force has been
acting for 2 s the rate at which it is doing work is:
A. 75W
B. 100W
C. 1000W
D. 2500W
E. 5000W