Universe — JEE physics STD 12 Science — Question

Assertion : Radiation is the speediest mode of heat transfer.
Reason : Radiation can be transmitted in zig-zag motion.

Assertion : By roughening the surface of a glass sheet its transparency can be reduced.
Reason : Glass sheet with rough surface absorbs more light.

Assertion : If the angles of the base of the prism are equal, then in the position of minimum deviation, the refracted ray will pass parallel to the base of prism.
Reason : In the case of minimum deviation, the angle of incidence is equal to the angle of emergence.

Assertion : Work done by a gas in isothermal expansion is more than the work done by the gas in the same expansion, adiabatically.
Reason : Temperature remains constant in isothermal expansion and not in adiabatic expansion.

Assertion : The ferromagnetic substance do not obey Curie's law.
Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.

Assertion : Thermodynamic process in nature are irreversible.
Reason : Dissipative effects can not be eliminated.

Assertion : Sound travel faster in solids than gases.
Reason : Solid possess greater density than gases.

Assertion : In circular motion, the centripetal and centrifugal force acting in opposite direction balance each other.
Reason : Centripetal and centrifugal forces don't act at the same time.

Assertion : A large force is required to draw apart normally two glass plates enclosing a thin water film.
Reason : Water works as glue and sticks two glass plates.