1) If two objects of 30 kg and 10 kg move with equal kinetic energy, then what is the ratio of magnitudes for linear momentum?
a. √3 : 1
b. 1 : √3
c. 1 : 3√3
d. 1 : 3
Answer
Explanation

ANSWER: √3 : 1
Explanation: No explanation is available for this question!


2) What is the SI unit of linear momentum?
a. kg.m ^{2} / sec
b. kg.m / sec
c. N.sec ^{2}
d. N.m.sec
Answer
Explanation

ANSWER: kg.m / sec
Explanation: No explanation is available for this question!


3) A ball is dropped on a horizontal surface from a height of 15 m. What will be the rebounding height of the ball after striking the surface? (coefficient of restitution = 0.8)
a. 9.6 m
b. 6.5 m
c. 5.6 m
d. Insufficient data
Answer
Explanation

ANSWER: 9.6 m
Explanation: No explanation is available for this question!


4) Which of the following laws derive impulse moment principle?
a. Newton's 3 ^{rd} law
b. Newton's 2 ^{nd} law
c. Newton's 1 ^{st} law
d. All of the above
Answer
Explanation

ANSWER: Newton's 2^{nd} law
Explanation: No explanation is available for this question!


5) What is the coefficient of restitution (e) for elastic impact?
a. e = 0
b. e = 1
c. e < 0
d. e > 1
Answer
Explanation

ANSWER: e = 1
Explanation: No explanation is available for this question!


6) If coefficient of restitution is zero during plastic impact, then ___________
a. kinetic energy is conserved
b. momentum energy is conserved
c. bodies move away after impact
d. all of the above
Answer
Explanation

ANSWER: momentum energy is conserved
Explanation: No explanation is available for this question!


7) Coefficient of restitution is the ratio of impulse during __________
a. plastic deformation and elastic deformation
b. elastic deformation and plastic deformation
c. restoration period and deformation period
d. deformation period and restoration period
Answer
Explanation

ANSWER: restoration period and deformation period
Explanation: No explanation is available for this question!


8) The total momentum of a system __________, if no external impressed force acts on it.
a. increases
b. decreases
c. remains constant
d. none of the above
Answer
Explanation

ANSWER: remains constant
Explanation: No explanation is available for this question!


9) An object of 30 kg is moved with a velocity of 2 m/s on a horizontal smooth surface. What is the velocity of the block for 4 seconds if force of 40 N is applied on it in the direction of force?
a. 2 m/s
b. 4.6 m/s
c. 7.33 m/s
d. 9.33 m/s
Answer
Explanation

ANSWER: 7.33 m/s
Explanation: No explanation is available for this question!


10) If a body is subjected to plastic impact, _______
a. only kinetic energy is conserved
b. only momentum is conserved
c. both a. and b.
d. none of the above
Answer
Explanation

ANSWER: only momentum is conserved
Explanation: No explanation is available for this question!

