Newton's Laws of Motion — JEE physics STD 12 Science — Question

Assertion : Friction is a self adjusting force.
Reason : Friction does not depend upon mass of the body.

Assertion : Neutral temperature of a thermocouple does not depend upon temperature of cold junction.
Reason : lts value is constant for the given metals of the couple.

Assertion : The cloud in sky generally appear to be whitish.
Reason : Diffraction due to cloud is efficient in equal measure at all wavelengths.

Assertion : For a satellite revolving very near to earth's surface the time period of revolution is given by 1 hour 24 minutes.
Reason : The period of revolution of a satellite depends only upon its height above the earth's surface.

Assertion : Leclanche cell is used, when constant supply of electric current is not required.
Reason : The e.m.f. of a Leclanche cell falls, if it is used continuously.

Assertion : By increasing the diameter of the objective of telescope, we can increase its range.
Reason : The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.

Assertion : The setting sun appears to be red.
Reason : Scattering of light is directly proportional to the wavelength.

Assertion : Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then rest of the half portion become more hot.
Reason : Resistances decreases due to decrease in temperature and so current through wire increases.

Assertion : A metal piece and a non-metal (stone) piece are dropped from the same height near earth's surface. Both will reach the earth's surface simultaneously.
Reason : There is no effect of earth's magnetic field on freely falling body.