Units, Dimensions and Measurement — JEE physics STD 12 Science — Question

Assertion : As temperature of a black body is raised, wavelength corresponding to maximum energy reduces.
Reason : Higher temperature would mean higher energy and hence higher wavelength.

Assertion : We can not change the temperature of a body without giving (or taking) heat to (or from) it.
Reason : According to principle of conservation of energy, total energy of a system should remains conserved.

Assertion : The viscosity of liquid increases rapidly with rise of temperature.
Reason : Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion amongst its different layers

Assertion : Rocket in flight is not an illustration of projectile.
Reason : Rocket takes flight due to combustion of fuel and does not move under the gravity effect alone.

Assertion : A person working on a horizontal road with a load on his head does no work.
Reason : No work is said to be done, if directions of force and displacement of load are perpendicular to each other.

Assertion : The electromagnetic waves of shorter wavelength can travel longer distances on earth's surface than those of longer wavelengths.
Reason : Shorter the wavelength, the larger is the velocity of wave propagation.

Assertion : Melting of solid causes no change in internal energy.
Reason : Latent heat is the heat required to melt a unit mass of solid.

Assertion : There is no dispersion of light refracted through a rectangular glass slab.
Reason : Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.

Assertion : The amplitude of an oscillating pendulum decreases gradually with time
Reason : The frequency of the pendulum decreases with time