The essential distinction between X-rays and γ - rays is that
| (a) γ- rays have smaller wavelength than X-rays |
|
(b) γ - rays emanate from nucleus while X-rays emanate from outer part of the atom |
| (c) γ- rays have greater ionizing power than X-rays |
| (d) γ- rays are more penetrating than X-rays |
(b) γ - rays emanate from nucleus while X-rays emanate from outer part of the atom
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Two identical metal plates show photoelectric effect by a light of wavelength 
falls on plate A and 
on plate B (
. The maximum kinetic energy is
|
(a) 2 |
(b) |
(c) |
(d) |
Blue colour of sky is due to:
In the case of bar magnet, lines of magnetic induction
|
(a) Start from the north pole and end at the south pole |
|
(b) Run continuously through the bar and outside |
|
(c) Emerge in circular paths from the middle of the bar |
|
(d) Are produced only at the north pole like rays of light from a bulb |
Assertion : Self-inductance is called the inertia of electricity.
Reason : Self-inductance is the phenomenon, according to which an opposing induced e.m.f. is produced in a coil as a result of change in current or magnetic flux linked in the coil.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Atomic radius of fcc is
|
(a) |
(b) |
(c) |
(d) |
In a triclinic crystal system
|
(a) a ≠ b ≠ c, α ≠ β ≠ γ |
(b) a = b = c, α ≠ β ≠ γ |
|
(c) a ≠ b ≠ c, α ≠ β = γ |
(d) a = b ≠ c, α = β = γ |
