Consider the system shown in figure. The pulley and the string are light and all the surfaces are frictionless. The tension in the string is (take g = 10 ms^-2)

• 0 N

• 1 N

• 2 N

• 5 N

Assertion:  Heavy water is used as moderator in nuclear reactor.

Reason:  Water cool down the fast neutron

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion:  Unlike electric force and gravitational forces, nuclear force has limited range.

Reason:  Nuclear force do not obey inverse square law.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion:  When a charged particle moves in a circular path. It produces electromagnetic wave.

Reason:  Charged particle has acceleration

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false

15.

Assertion:  KE is conserved at every instant of elastic collision. 

Reason:  No deformation of matter occurs in
elastic collision.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion:  Value of radius of gyration of a body depends on axis of rotation. 

Reason:  Radius of gyration is root mean square distance of particle of the body from the axis of rotation.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

A body of mass 60 kg is suspended by means of three strings P Q and R as shown in the figure is in equilibrium. The tension in the string P is

• 130.9 g N

• 60 g N

• 50 g N

• 103.9 g N

The angular amplitude of simple pendulum is θ_o. The maximum tension in its string will be

• mg ( 1 - θ₀ )

• mg ( 1 + cosθ₀)

• mg ( 1 - cos)

• mg ( 1 + cos)

The temperature of a body is increased from $-$73^o C to 327^o C. Then the ratio of emissive power is

• 1/9

• 1/27

• 27

• 81

A cylindrical tank is filled with water to level of 3 m. A hole is opened at height of 52.5 cm from bottom. The ratio of the area of the hole to that of cross-sectional area of the cylinder is 0.1. The square of the speed with which water is coming out from the orifice is (Take g = 10 m s^-2)

• 50 m² s^-2

• 40 m² s^-2

• 51.5 m² s^-2

• 50.5 m² s^-2