Communication — JEE physics STD 12 Science — Question

Assertion : When a light wave travels from a rarer to a denser medium, it loses speed. The reduction in speed imply a reduction in energy carried by the light wave.
Reason : The energy of a wave is proportional to velocity of wave.

Assertion : First law of thermodynamics is a restatement of the principle of conservation
Reason : Energy is fundamental quantity.

Assertion : A capacitor of suitable capacitance can be used in an ac circuit in place of the choke coil.
Reason : A capacitor blocks dc and allows ac only.

Assertion : In meter bridge experiment, a high resistance is always connected in series with a galvanometer.
Reason : As resistance increases current through the circuit increases.

Assertion : To float, a body must displace liquid whose weight is greater than the actual weight of the body.
Reason : The body will experiences no net downward force, in the case of floating.

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

Assertion : The colour of the green flower seen through red glass appears to be dark.
Reason : Red glass transmits only red light.

Assertion : A piece of red glass is heated till it glows in dark. The colour of glowing glass would be orange.
Reason : Red and orange is complementary colours.

Assertion : Generally the path of a projectile from the earth is parabolic but it is elliptical for projectiles going to a very large height.
Reason : The path of a projectile is independent of the gravitational force of earth.

Assertion : If the amplitude of a simple harmonic oscillator is doubled, its total energy becomes four times.
Reason : The total energy is directly proportional to the square of amplitude of vibration of the harmonic oscillator.