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 is thrown straight down with an initial speed of 4 m/s from a window which is 8 m

above the ground. The time it takes the object to reach the ground is:

A. 0.80 s

**B. 0.93 s**

C. 1.3 s

D. 1.7 s

E. 2.0 s

**2. **A stone is released from rest from the edge of a building roof 190 m above the ground. Ne-

glecting air resistance, the speed of the stone, just before striking the ground, is:

A. 43 m/s

**B. 61 m/s**

C. 120 m/s

D. 190 m/s

E. 1400 m/s

**3.** An object is thrown vertically upward with a certain initial velocity in a world where the

acceleration due to gravity is 19.6 m/s2. The height to which it rises is that to which

the object would rise if thrown upward with the same initial velocity on the Earth. Neglect

friction.

**A. half**

B. √

2 times

C. twice

D. four times

E. cannot be calculated from the given data

**4. **A projectile is shot vertically upward with a given initial velocity. It reaches a maximum height

of 100 m. If, on a second shot, the initial velocity is doubled then the projectile will reach a

maximum height of:

A. 70.7 m

B. 141.4 m

C. 200 m

D. 241 m

**E. 400 m**

**5. **One object is thrown vertically upward with an initial velocity of 100 m/s and another object

with an initial velocity of 10 m/s. The maximum height reached by the first object will be

that of the other.

A. 10 times

**B. 100 times**

C. 1000 times

D. 10, 000 times

E. none of these

**6. **The area under a velocity-time graph represents:

A. acceleration

B. change in acceleration

C. speed

D. change in velocity

**E. displacement**

**7.** Displacement can be obtained from:

A. the slope of an acceleration-time graph

B. the slope of a velocity-time graph

C. the area under an acceleration-time graph

**D. the area under a velocity-time graph**

E. the slope of an acceleration-time graph

**8. **An object has a constant acceleration of 3 m/s2. The coordinate versus time graph for this

object has a slope:

**A. that increases with time**

B. that is constant

C. that decreases with time

D. of 3 m/s

E. of 3 m/s2

**9.**The coordinate-time graph of an object is a straight line with a positive slope. The object has:

A. constant displacement

B. steadily increasing acceleration

C. steadily decreasing acceleration

**D. constant velocity**

E. steadily increasing velocity

**10. **We say that the displacement of a particle is a vector quantity. Our best justification for this

assertion is:

A. displacement can be specified by a magnitude and a direction

**B. operating with displacements according to the rules for manipulating vectors leads to re-**

**sults in agreement with experiment**s

C. a displacement is obviously not a scalar

D. displacement can be specified by three numbers

E. displacement is associated with motion

**11. **A vector of magnitude 3 CANNOT be added to a vector of magnitude 4 so that the magnitude

of the resultant is:

**A. zero**

B. 1

C. 3

D. 5

E. 7

**12. **A vector of magnitude 20 is added to a vector of magnitude 25. The magnitude of this sum

might be:

A. zero

B. 3

**C. 12**

D. 47

E. 50

**13.** A vector Sn of magnitude 6 and another vector Tn have a sum of magnitude 12. The vector Tn:

**A. must have a magnitude of at least 6 but no more than 18**

B. may have a magnitude of 20

C. cannot have a magnitude greater than 12

D. must be perpendicular to Sn

E. must be perpendicular to the vector sum

**14. **The vector −An is:

A. greater than An in magnitude

B. less than An in magnitude

C. in the same direction as An

**D. in the direction opposite to An**

E. perpendicular to An

**15.** If |An + Bn |

2 = A2 + B2, then:

A. An and Bn must be parallel and in the same direction

B. An and Bn must be parallel and in opposite directions

C. either An or Bn must be zero

D. the angle between An and Bn must be 60◦

**E. none of the above is true**

**16. **Vectors An and Bn lie in the xy plane. We can deduce that An = Bn if:

A. A2x + A2y = B2x + B2y

B. Ax + Ay = Bx + By

**C. Ax = Bx and Ay = By**

D. Ay/Ax = By/Bx

E. Ax = Ay and Bx = By

**17. **A vector has a magnitude of 12. When its tail is at the origin it lies between the positive x

axis and the negative y axis and makes an angle of 30◦ with the x axis. Its y component is:

A. 6/√3

B. −6√3

C. 6

**D. −6**

E. 12

**18.** If the x component of a vector An, in the xy plane, is half as large as the magnitude of the

vector, the tangent of the angle between the vector and the x axis is:

A. √3

B. 1/2

C. √3/2

**D. 3/2**

E. 3

**19. **If An = (6 m)ˆi − (8 m)ˆj then 4An has magnitude:

A. 10 m

B. 20 m

C. 30 m

**D. 40 m**

E. 50 m

**20.** A vector has a component of 10 m in the +x direction, a component of 10 m in the +y direction,

and a component of 5 m in the +z direction. The magnitude of this vector is:

A. zero

**B. 15 m**

C. 20 m

D. 25 m

E. 225 m

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