NEET 2017 | Center of Mass and Collision Question 13 | Physics

NEET 2017

MCQ (Single Correct Answer)

-1

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.

(1) and (2)

(2) and (3)

(3) and (4)

(4)

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

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 :

$$-$$0.5 m s^$$-$$1 and 0.3 m s^$$-$$1

0.5 m s^$$-$$1 and $$-$$0.3 m s^$$-$$1

$$-$$0.3 m s^$$-$$1 and 0.5 m s^$$-$$1

0.3 m s^$$-$$1 and 0.5 m s^$$-$$1

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

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

100 m s^$$-$$1

80 m s^$$-$$1

120 m s^$$-$$1

160 m s^$$-$$1

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

A rigid ball of mass m strikes a rigid wall at 60^o 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

NEET 2016 Phase 2 Physics - Center of Mass and Collision Question 33 English

$$mV$$

2 $$mV$$

$${{mV} \over 2}$$

$${{mV} \over 3}$$

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