1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following statements are correct ?

(1)   Centre of mass of a body always coincides with the centre of gravity of the body.

(2)   Centre of mass of a body is the point at which the total gravitational torque on the body is zero.

(3)   A couple on a body produces both translational and rotational motion in a body

(4)   Mechanical advantage greater than one means that small effort can be used to lift a large load.
A
(1) and (2)
B
(2) and (3)
C
(3) and (4)
D
(4)
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
A rigid ball of mass m strikes a rigid wall at 60o and gets reflected without loss of speed as shown in the figure. The value of impulse imparted by the wall on the ball will be :
NEET 2016 Phase 2 Physics - Center of Mass and Collision Question 33 English
A
$$mV$$
B
2 $$mV$$
C
$${{mV} \over 2}$$
D
$${{mV} \over 3}$$
3
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
Two identical balls A and B having velocities of 0.5 m s$$-$$1 and $$-$$0.3 m s$$-$$1 respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be :
A
$$-$$0.5 m s$$-$$1 and 0.3 m s$$-$$1
B
0.5 m s$$-$$1 and $$-$$0.3 m s$$-$$1
C
$$-$$0.3 m s$$-$$1 and 0.5 m s$$-$$1
D
0.3 m s$$-$$1 and 0.5 m s$$-$$1
4
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
A bullet of mass 10 g moving horizontally with a velocity of 400 m s$$-$$1 strikes a wood block of mass 2 kg which is suspended by light inextensible string of length 5 m. As a result, the centre of gravity of the block found to rise a vertical distance of 10 cm. The speed of the bullet after it emerges out horizontally from the block will be
A
100 m s$$-$$1
B
80 m s$$-$$1
C
120 m s$$-$$1
D
160 m s$$-$$1
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