Questions and answers for exam Preparation

MCQs

Total Questions : 1284 | Page 1 of 129 pages

Question 1. If ‘v’ and ‘ω’ are linear and angular velocities, the centripetal acceleration of a moving body along the circular path of radius ‘r’, will be

r/v²
v²/r
r/ω²
ω²/r

Discuss Question

Answer: Option B. -> v²/r

Question 2. On a mass ‘m’ describing a circular path of radius ‘r’, the centrifugal force

Acts tangentially to the circular path
Acts towards the centre of rotation
Acts away from the centre of rotation
Is mw2r/g kgf

Discuss Question

Answer: Option B. -> Acts towards the centre of rotation

Question 3. A weight ‘w’ is suspended at the free end of a light member hinged to a vertical wall. if the angle of inclination of the member with the upper wall is θ°, the force introduced in the member, is

W sec θ
W cos θ
W sin θ
W cosec θ

Discuss Question

Answer: Option A. -> W sec θ

Question 4. Newton’s law of motion is:

Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
To every action, there is always an equal and opposite reaction
All the above

Discuss Question

Answer: Option D. -> All the above

Question 5. Ball ‘a’ of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball ‘b’ on the table. if the impact is perfectly elastic, the velocity of the ball ‘b’ just after impact would be

Zero
5 m/sec
10 m/sec
None of these

Discuss Question

Answer: Option C. -> 10 m/sec

Question 6. When a body of mass m1 is hanging freely and another of mass m2 lying on a smooth inclined plane(α) are connected by a light index tensile string passing over a smooth pulley, the acceleration of the body of mass m1, will be given by

g(M1 + M2 sin α)/(M1 + M2) m/sec
g(M1 - M2 sin α)/(M1 + M2) m/sec²
g(M2 + M1 sin α)/(M1 + M2) m/sec²
g(M2 × M1 sin α)/(M2 - M1) m/sec²

Discuss Question

Answer: Option B. -> g(M1 - M2 sin α)/(M1 + M2) m/sec²

Question 7. If ‘v’ and ‘ω’ are linear and angular velocities, the centripetal acceleration of a moving body along the circular path of radius ‘r’, will be

r/v²
v²/r
r/ω²
ω²/r

Discuss Question

Answer: Option B. -> v²/r

Question 8. If ‘v’ and ‘ω’ are linear and angular velocities, the centripetal acceleration of a moving body along the circular path of radius ‘r’, will be

r/v²
v²/r
r/ω²
ω²/r

Discuss Question

Answer: Option B. -> v²/r

Question 9. ‘p’ is the force acting on a body whose mass is ‘m’ and acceleration is ‘f’. the equation p - mf= 0, is known as

Equation of dynamics
Equation of dynamic equilibrium
Equation of statics
None of these

Discuss Question

Answer: Option A. -> Equation of dynamics

Question 10. A weight ‘w’ is suspended at the free end of a light member hinged to a vertical wall. if the angle of inclination of the member with the upper wall is θ°, the force introduced in the member, is