Magnetism — JEE physics STD 12 Science — Question

Assertion : According to law of conservation of mechanical energy change in potential energy is equal and opposite to the change in kinetic energy.
Reason : Mechanical energy is not a conserved quantity.

Assertion : The universal gravitational constant is same as acceleration due to gravity.
Reason : Gravitational constant and acceleration due to gravity have same dimensional formula.

Assertion : Work done by friction on a body sliding down an inclined plane is positive.
Reason : Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.

Assertion : Transverse waves travel through air in an organ pipe.
Reason : Air possesses only volume elasticity.

Assertion : Nicol prism is used to produce and analyse plane polarised light.
Reason : Nicol prism reduces the intensity of light to zero

Assertion : Red shift confirms that the universe is expanding
Reason : Wavelength of red light is maximum in the visible region

Assertion : A body becomes weightless at the centre of earth.
Reason : As the distance from centre of earth decreases, acceleration due to gravity increases.

Assertion : The isothermal curves intersect each other at a certain point.
Reason : The isothermal change takes place slowly, so the isothermal curves have very little slope.