# Rectilinear Motion - Mechanical Engineering (MCQ) questions and answers

1)   At zero acceleration a particle moves along a straight line. What is the velocity of a particle at the position of
x = t4 -20t2 + 42 ?

a. + 48.68 m/sec
b. - 48.68 m/sec
c. + 42 m/sec
d. - 42 m/sec
 Answer  Explanation ANSWER: - 48.68 m/sec Explanation: No explanation is available for this question!

2)   A ball dropped from a wall of height h travels a distance of 50 m in last two seconds before landing. What is the height of the wall from which the ball was dropped?

a. 120.15 m
b. 127.37 m
c. 183.48 m
d. Insufficient data
 Answer  Explanation ANSWER: 127.37 m Explanation: No explanation is available for this question!

3)   What is the length of a train which crosses a bridge of 150 m in 20 sec with a speed of 40 km/h?

a. 222 m
b. 150 m
c. 72.2 m
d. 70.5 m
 Answer  Explanation ANSWER: 72.2 m Explanation: No explanation is available for this question!

4)   The rate of change of __________ with respect to time is called as jerk.

a. acceleration
b. density
c. displacement
d. volume
 Answer  Explanation ANSWER: acceleration Explanation: No explanation is available for this question!

5)   During unidirectional motion, the displacement and distance traveled by a particle with uniform acceleration is ______

a. different
b. same
c. variable
d. none of the above
 Answer  Explanation ANSWER: same Explanation: No explanation is available for this question!

6)   The nature of v-t curve is as shown below, when acceleration of a particle is _______

a. a linear function of time
b. non-zero and constant
c. zero
d. none of the above
 Answer  Explanation ANSWER: non-zero and constant Explanation: No explanation is available for this question!

7)   What is the initial velocity of an object which travels a distance of 10t2 +15t + 5 along a straight line in time t?

a. -10
b. +10
c. -15
d. +15
 Answer  Explanation ANSWER: +15 Explanation: No explanation is available for this question!

8)   When acceleration is _______, velocity of a particle is constant.

a. constant but non zero
b. maximum
c. zero
d. none of the above
 Answer  Explanation ANSWER: zero Explanation: No explanation is available for this question!

9)   A bus travels with a speed of 15 m/s when accelerated at 0.10 m/s2 from its rest position. What is the distance traveled?

a. 1125 m
b. 1000 m
c. 2250 m
d. None of the above
 Answer  Explanation ANSWER: 1125 m Explanation: No explanation is available for this question!

10)   What is the distance traveled by an electron in first 4 seconds from its initial position, if velocity time relation is given as  v = 3t?

a. 12 m
b. 15 m
c. 20 m
d. 24 m
 Answer  Explanation ANSWER: 24 m Explanation: No explanation is available for this question!