Practice Pakistan's most useful MCQs for competitive exams

A quantity measured in the C.G.S system of units has dimensions M”2L3 T3/2. What numerical factor would be required to convert the quantity to SI units ?

• (A)  1
• (B)  100
• (C)  1/100
• (D)  1/10000

Answer

Submitted By :Ali Uppal

A system of copianar forces is in equilibrium when___________________?

• (A)  force polygon closes
• (B)  funicular polygon closes
• (C)  both force polygon” and funicular polygon close
• (D)  all the forces are concurrent

Answer

Submitted By :Ali Uppal

Free body diagram is an____________________?

• (A)  isolated joint with only body forces acting on it
• (B)  isolated joint with internal forces acting on it
• (C)  isolated joint with all the forces, internal as well as external, acting on it
• (D)  none of the above

Answer

Submitted By :Ali Uppal

In a lifting machine a weight of 5 kN is lifted through 200 mm by an effort of 0.1 kN moving through 15 m. The mechanical advantage and velocity ratio of the machine are respectively_____________________?

• (A)  50 and 75
• (B)  75 and 50
• (C)  75 and 75
• (D)  50 and 50

Answer

Submitted By :Ali Uppal

A stone was thrown vertically upwards from the ground with a velocity of 50 m/sec. After 5 seconds another stone was thrown vertically upwards from the same place. If both the stones strike the ground at the same time, then the velocity with which the second stone was thrown should be (Assume g = 10 m/sec2)______________________?

• (A)  15 m/sec
• (B)  25 m/sec
• (C)  40 m/sec
• (D)  50 m/sec

Answer

Submitted By :Ali Uppal

A particle is dropped from a height of 3 m on a horizontal floor, which has a coefficient of restitution with the ball of 1/2. The height to which the ball will rebound after striking the floor is____________________?

• (A)  0.5 m
• (B)  0.75 m
• (C)  1.0 m
• (D)  1.5 m

Answer

Submitted By :Ali Uppal

One Joule is equivalent to________________?

• (A)  9.81 Newton – metre
• (B)  1 Newton – metre
• (C)  1 kg wt – metre
• (D)  1 dyne – metre

Answer

Submitted By :Ali Uppal

If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is_____________________?

• (A)  —rad/sec 10
• (B)  —rad/sec 20
• (C)  —rad/sec 30
• (D)  none of the above

Answer

Submitted By :Ali Uppal

A car goes round a curve of radius 100 m at 25 m/sec. The angle to the horizontal at which the road must be banked to prevent sideways friction on the car wheels is tan”1 x, where x is (Assume g = 10 m/sec2)_____________________?

• (A)  3/8
• (B)  1/2
• (C)  9/5
• (D)  5/8

Answer

Submitted By :Ali Uppal

A body is dropped from a height of 100 m and at the same time another body is projected vertically upward with a velocity of 10 m/sec. The two particles will____________________?

• (A)  never meet
• (B)  meet after 1 sec
• (C)  meet after 5 sec
• (D)  meet after 10 sec

Answer

Submitted By :Ali Uppal