Practice Pakistan's most useful MCQs for competitive exams

The ratio of the speed of a rolling cylinder to the speed of sliding cylinder is_______________?

• (A)  less than 1
• (B)  equal to 1
• (C)  between 1 and 2
• (D)  greater than 2

Answer

Submitted By :Ali Uppal

A flywheel of moment of inertia 20 kg-m” is acted upon by a tangential force of 5 N at 2 m from its axis, for 3 seconds. The increase in angular velocity in radian persecond is__________________?

• (A)  1/2
• (B)  3/2
• (C)  2
• (D)  3

Answer

Submitted By :Ali Uppal

The dimensions of Gravitational Universal constant ‘G’ are______________?

• (A)  M-‘L2r2
• (B)  M-‘L3r2
• (C)  M-2L3T2
• (D)  M’L3T2

Answer

Submitted By :Ali Uppal

One Newton is equivalent to_________________?

• (A)  105 dyne
• (B)  106 dyne
• (C)  107 dyne
• (D)  981 dyne

Answer

Submitted By :Ali Uppal

The potential energy of a particle falling through a straight shaft drilled through the earth (assumed homogenous and spherical) is proportional to____________________?

• (A)  log r
• (B)  r
• (C)  r2
• (D)  1/r

Answer

Submitted By :Ali Uppal

At the instantaneous center, the velocity of the moving lamina at any instant is_________________?

• (A)  zero
• (B)  maximum
• (C)  minimum
• (D)  varying

Answer

Submitted By :Ali Uppal

Which of the following represents the state of neutral equilibrium ?

• (A)  a cube resting on one edge
• (B)  a smooth cylinder lying on a curved surface
• (C)  a smooth cylinder lying on a convex surface
• (D)  none of the above

Answer

Submitted By :Ali Uppal

One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is___________________?

• (A)  a simple harmonic motion
• (B)  a rectilinear motion with constant speed
• (C)  a damped oscillatory motion
• (D)  none of the above

Answer

Submitted By :Ali Uppal

A simple pendulum of length / has an energy E, when its amplitude is A. If the length of pendulum is doubled, the energy will be___________________?

• (A)  E
• (B)  E/2
• (C)  2E
• (D)  4E

Answer

Submitted By :Ali Uppal

If the kinetic energy and potential energy of a simple harmonic oscillator of amplitude A are both equal to half the total energy, then the displacement is equal to_________________?

• (A)  A
• (B)  A/2
• (C)  A/V2
• (D)  AV2

Answer

Submitted By :Ali Uppal