Mechanics Multiple Choice Questions Answers
1. The radial component of velocity for a particle moving in a circular path is ______.
A. Constant
B. Radius itself
C. Variable
D. Zero
2. Young’s modulus formula is ____________.
A. Tensile strain/tensile stress
B. Tensile stress/tensile strain
C. Tensile stress × tensile strain
D. Length/area
3. The radius of curvature of trajectory for a profile is minimum, if __________.
A. Velocity is minimum
B. Acceleration is maximum
C. Both a. and b.
D. None of the above
4. Speed ‘v’ with which wave travels through a medium is given by
A. Modulus of elasticity/density of the medium
B. Modulus of elasticity/√(density of the medium)
C. √(modulus of elasticity/density of the medium)
D. v=d/t
5. Let suppose there is an elevator travels at constant velocity, the normal reaction R is given as ______.
A. mg
B. ma
C. m(g-a)
D. None of these
6. Hooke’s law defination is.
A. The extension is inversely proportional to the load when the elastic limit is not exceeded
B. The extension is independent of the load when the elastic limit is not exceeded
C. The extension is proportional to the load when the elastic limit is not exceeded
D. None of these
7. Dimensions of strain are
A. [L]
B. [M] [L]-1 [T]-2
C. [L]-1
D. It’s a dimensionless quantity
8. A block sliding down an inclined plane has acceleration _________ acceleration due to gravity.
A. Less than
B. Greater than
C. Same as
D. None of these
9.At ‘yield point’ of a copper wire
A. The load hasn’t exceeded the elastic limit yet; so, Hooke’s law applies
B. The load has already exceeded the elastic limit and the material has become plastic
C. Even the plastic stage has passed and the wire has snapped already
D. Like Brass and Bronze, Copper has no yield point
10. When acceleration is _______, a velocity of a particle is constant.
A. Constant but non zero
B. Maximum
C. Zero
D. None of the above
11.standing waves is also called _____.
A. Stationary waves
B. Static waves
C. Progressive waves
D. None of these
12. Which of the following statements is false about forces/couple?
A. Moment of the couple is a free vector
B. Resultant and equilibrant are equal in magnitude and direction
C. Resultant of a couple is always zero
D. Parallelogram law is to be proved experimentally