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.** An object rests on a horizontal frictionless surface. A horizontal force of magnitude F is

applied. This force produces an acceleration:

A. only if F is larger than the weight of the object

B. only while the object suddenly changes from rest to motion

**C. always**

D. only if the inertia of the object decreases

E. only if F is increasing

**2. **A 25-kg crate is pushed across a frictionless horizontal floor with a force of 20 N, directed 20◦

below the horizontal. The acceleration of the crate is:

A. 0.27 m/s

**B. 0.75 m/s**

C. 0.80 m/s

D. 170 m/s

E. 470 m/s

**3. **A ball with a weight of 1.5 N is thrown at an angle of 30◦ above the horizontal with an initial

speed of 12 m/s. At its highest point, the net force on the ball is:

A. 9.8 N, 30◦ below horizontal

B. zero

C. 9.8 N, up

D. 9.8 N, down

**E. 1.5 N, down**

**4. **Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the

west. The magnitude of the acceleration of the crate is:

A. 0.50 m/s

**B. 2.0 m/s**

C. 2.8 m/s

D. 10 m/s

E. 50 m/s

ans: B

**5. **A 400-N steel ball is suspended by a light rope from the ceiling. The tension in the rope is:

**A. 400 N**

B. 800 N

C. zero

D. 200 N

E. 560 N

**6. **A heavy steel ball B is suspended by a cord from a block of wood W. The entire system is

dropped through the air. Neglecting air resistance, the tension in the cord is:

**A. zero**

B. the difference in the masses of B and W

C. the difference in the weights of B and W

D. the weight of B

E. none of these

**7. **A 1000-kg elevator is rising and its speed is increasing at 3 m/s. The tension force of the cableon the elevator is:

A. 6800 N

B. 1000 N

C. 3000 N

D. 9800 N

**E. 12800 N**

**8. **A 5-kg block is suspended by a rope from the ceiling of an elevator as the elevator accelerates

downward at 3.0 m/s. The tension force of the rope on the block is:

A. 15 N, up

**B. 34 N, up**

C. 34 N, down

D. 64 N, up

E. 64 N, down

**9. **A crane operator lowers a 16, 000-N steel ball with a downward acceleration of 3 m/s. Thetension force of the cable is:

A. 4900 N

**B. 11, 000 N**

C. 16, 000 N

D. 21, 000 N

E. 48, 000 N

**10. **A car moves horizontally with a constant acceleration of 3 m/s. A ball is suspended by a

string from the ceiling of the car. The ball does not swing, being at rest with respect to the

car. What angle does the string make with the vertical?

**A. 17◦**

B. 35◦

C. 52◦

D. 73◦

E. Cannot be found without knowing the length of the string

**11. **A man weighing 700 Nb is in an elevator that is accelerating upward at 4 m/s. The forceexerted on him by the elevator floor is:

A. 71 N

B. 290 N

C. 410 N

D. 700 N

**E. 990 N**

**12. **You stand on a spring scale on the floor of an elevator. Of the following, the scale shows the

highest reading when the elevator:

**A. moves upward with increasing speed**

B. moves upward with decreasing speed

C. remains stationary

D. moves downward with increasing speed

E. moves downward at constant speed

**13.** You stand on a spring scale on the floor of an elevator. Of the following, the scale shows the

highest reading when the elevator:

A. moves downward with increasing speed

**B. moves downward with decreasing speed**

C. remains stationary

D. moves upward with decreasing speed

E. moves upward at constant speed

**14. **When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed

20◦ below the horizontal, the magnitude of the normal force of the floor on the crate is:

A. 25 N

B. 68 N

C. 180 N

D. 250 N

**E. 310 N**

**15. **A block slides down a frictionless plane that makes an angle of 30◦ with the horizontal. The

acceleration of the block is:

A. 980 cm/s

B. 566 cm/s

C. 849 cm/s

D. zero

**E. 490 cm/s**

**16. **A 25-N crate slides down a frictionless incline that is 25◦ above the horizontal. The magnitude

of the normal force of the incline on the crate is:

A. 11 N

**B. 23 N**

C. 25 N

D. 100 N

E. 220 N

**17. **A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline. If

the incline is 25◦ above the horizontal the magnitude of the applied force is:

A. 4.1 N

B. 4.6 N

C. 8.9 N

**D. 11 N**

E. 23 N

**18. **A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline. If

the incline is 25◦ above the horizontal the magnitude of the normal force of the incline on the

crate is:

A. 4.1 N

B. 4.6 N

C. 8.9 N

D. 11 N

**E. 23 N**

**19.** A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up

a frictionless incline that is 30◦ above the horizontal. The mass of the crate is:

A. 3.3 kg

B. 3.8 kg

C. 5.7 kg

**D. 6.5 kg**

E. 160 kg

**20. **A sled is on an icy (frictionless) slope that is 30◦ above the horizontal. When a 40-N force,

parallel to the incline and directed up the incline, is applied to the sled, the acceleration of the

sled is 2.0 m/s, down the incline. The mass of the sled is:

A. 3.8 kg

B. 4.1 kg

C. 5.8 kg

D. 6.2 kg

**E. 10 kg**

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