Question 71 : The motion of electrons round the nucleus is an example of?
1. Translatory motion.
2. Orbital motion.
3. Spin motion.
4. Vibrational motion.
View Answer   Discuss with Members

Question 72 : The point of intersection of the lines of action of the weight of all the points of body is called?
1. centre of gravity of the body
2. None of these
3. Centre of mass of the body
4. centre of the body
View Answer   Discuss with Members

Question 73 : If the axis of rotation does not pass through the body the rotatory motion is said to be?
1. Oscillatory motion.
2. Circular motion.
3. Orbital motion.
4. Spin motion.
View Answer   Discuss with Members

Question 74 : Rotatory motion is of two kinds: (i) Spin motion and (ii) ?
1. Circular motion.
2. Orbital motion.
3. Translatory motion.
4. Vibrational motion.
View Answer   Discuss with Members

Question 75 : When the net torque acting on a system is zero, which of the following will be constant?
1. Linear momentum
2. angular momentum
3. None of these
4. Force
View Answer   Discuss with Members

Question 76 : A body (a rigid body) is said to possess a purely rotatory motion if every constituent particle of the body moves in a circle, the centre of which are on a straight line called?
1. The fixed line.
2. The line of rotation.
3. The axis of rotation.
4. The spinning rod.
View Answer   Discuss with Members

Question 77 : In translatory motion, the axes of the frame of reference of the object remains always parallel to the corresponding axes of?
1. mover's frame of reference.
2. rotator's frame of reference.
3. None of these.
4. observer's frame of reference.
View Answer   Discuss with Members

Question 78 : The motion of the train and the car belongs to the?
1. Rotatory motion.
2. Translatory motion.
3. To and fro motion.
4. Spin motion.
View Answer   Discuss with Members