Surface Tension — JEE physics STD 12 Science — Question

Assertion : The stars twinkle while the planets do not.
Reason : The stars are much bigger in size than the planets.

Assertion : Ultraviolet radiation are of higher frequency waves are dangerous to human being.
Reason : Ultraviolet radiation are absorbed by the atmosphere

Assertion : In Young's experiment, the fringe width for dark fringes is different from that for white fringes.
Reason : In Young's double slit experiment the fringes are performed with a source of white light, then only black and bright fringes are observed.

Assertion : Zeroth law of thermodynamic explain the concept of energy.
Reason : Energy is dependent on temperature.

Assertion : A safe turn by a cyclist should neither be fast nor sharp.
Reason : The bending angle from the vertical would decrease with increase in velocity.

Assertion : Heavy water is used as moderator in nuclear reactor.
Reason : Water cool down the fast neutron.

Assertion : When a magnetic dipole is placed in a non uniform magnetic field, only a torque acts on the dipole.
Reason : Force would also acts on dipole if magnetic field were uniform.

Assertion : Parallex method cannot be used for measuring distances of stars more than 100 light years away.
Reason : Because parallex angle reduces so much that it cannot be measured accurately.

Assertion : In a common emitter transistor amplifier the input current is much less than the output current.
Reason : The common emitter transistor amplifier has very high input impedance.