MCQ
Cyclotron is a device used to _________.
- ASlow down charged particles
- BAccelerate the positively charged particles
- CStop the charged particles
- DNone of the options
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If the thermionic current density is J and emitter temperature is T then the curve between and
will be
|
(a)
|
(b)
|
(c)
|
(d)
|
If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
|
(a) 9 : 4 |
(b) 4 : 3 |
(c) 3 : 8 |
(d) 3 : 2 |
The rest mass of the photon is
|
(a) 0 |
(b) ∞ |
|
(c) Between 0 and ∞ |
(d) Equal to that of an electron |
When
undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1kg of
undergoes fission
|
(a) 9 |
(b) 9 |
(c) 9 |
(d) 9 |