Engineering Questions with Answers - Multiple Choice Questions
MCQs on Impulse Momentum Equation
1 - Question
When a cricket bat hits a cricket ball, impulse is applied on the_________
a) Bat
b) Ball
c) Bat and ball
d) No impulse is applied
View Answer
b
Explanation: Time passes as force is applied on an object. The bat applies the force on the ball for a short period of time. By this way, we can say in accordance to the Newton’s third law forces come in pairs. So, the ball also applies a force on the bat, therefore it has an impulse applied to it.
2 - Question
Momentum is a ______ quantity
a) Scalar
b) Vector
c) Infinite
d) Zero
View Answer
b
Explanation: Momentum is a vector quantity as it has both size and direction. Size of the momentum is equal to the mass of the object into the size of the objects velocity. The direction of objects velocity is the same as the direction of the momentum.
3 - Question
The equation for impulse is_______
a) F∆t=m∆v
b) F∆t=mu
c) F∆t=mT
d) F∆t=mRT
View Answer
a
Explanation: Impulse is equal to the net force times the length of time over which the force is applied on the body of the fluid. On the right hand side, we have the change in momentum. Thus, option ‘a’ is the most suitable one.
4 - Question
What is the SI unit of impulse?
a) N/m
b) N/m2
c) N.s
d) Kg.m
View Answer
c
Explanation: The SI unit of impulse is Newton second. It is given by the linear momentum due to the vector change. This produces an impulse in the same direction with respect to a given time.
5 - Question
What is the SI unit of momentum?
a) kgm/s
b) kgm/s2
c) kgm/s3
d) kg.m2
View Answer
a
Explanation: The SI unit of momentum is given by the product of the units of mass and velocity. In SI units, (mass is in kg) and (velocity is in m/s). As we know that momentum is mass times velocity. The unit turns out to be kgm/s.
6 - Question
Change in momentum of an object is equal to the_______
a) Internal Energy
b) Entropy
c) Impulse
d) Enthalpy
View Answer
c
Explanation: The mass is distributed over two velocities. According to the Newton’s second law, the change in momentum is equal to the impulse so produced. Since, momentum is a quantity that describes an object’s resistance to stopping. It is equated with its impulse.
7 - Question
What is the unit of specific impulse?
a) m/s
b) m2/s
c) m3/s
d) m/s2
View Answer
a
Explanation: Specific impulse is equal to the exhaust velocity of the fluid. Since, the unit of exhaust velocity is m/s, the unit of specific impulse is also the same. It is used to measure the efficacy of rocket propellants.
8 - Question
What is the formula to find specific impulse?
a) Jsp=m/v
b) Jsp= J/m
c) Jsp=T/m
d) Jsp=J/q
View Answer
b
Explanation: Specific impulse is defined as impulse per weight. It can also be defined as thrust per weight of a flow rate. It is equal to the exhaust velocity divided by acceleration due to gravity. (SI Unit: m/s)
9 - Question
Angular momentum is a _______ quantity
a) Scalar
b) Vector
c) Infinite
d) Finite
View Answer
b
Explanation: Angular momentum is a vector quantity as it has both size and direction. Size of the momentum is equal to the mass of the object into the size of the object’s velocity. The direction of objects velocity is the same as the direction of the momentum.
10 - Question
Angular momentum is proportional to __________
a) Inertia and angular speed
b) Mass and angular speed
c) Angular speed and volume
d) Rate of change of angular speed
View Answer
a
Explanation: Moment of inertia is not only dependent on the amount of matter. It also depends upon the position of axis of rotation and the shape of the matter. (Formula: L=Iω). Thus, inertia and angular speed play an important role in determining the angular momentum.