- ARadio waves
- B$\beta$ rays
- CInfrared rays
- D$\gamma$ rays
Explanation:
$\beta$ are stream of particles comprising of electrons moving with very high velocity, hence it cannot be polarized, while others can as they are electromagnetic waves.
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If luminous efficiency of a lamp is 2 lumen/watt and its luminous intensity is 42 candela, then power of the lamp is
|
(a) 62 W |
(b) 76 W |
(c) 138 W |
(d) 264 W |
$\frac{1}{\lambda}$
$\Big(\text{ln}\frac{2}{\lambda}\Big)$
$\lambda(\text{ln}2)$
$\frac{\lambda}{(\text{ln})2}$
The band spectra (characteristic of molecular species) is due to emission of radiation
|
(a) Gaseous state |
(b) Liquid state |
(c) Solid state |
(d) All of three states |
The hyper-metropia is a
|
(a) Short-side defect |
(b) Long- side defect |
|
(c) Bad vision due to old age |
(d) None of these |
Assertion : Base in a transistor is made very thin as compared to collector and emitter regions.
Reason : Due to thin base power gain and voltage gain is obtained by a transistor.
|
(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. |
Resistors of 1, 2, 3 ohm are connected in the form of a triangle. If a 1.5 volt cell of negligible internal resistance is connected across 3 ohm resistor, the current flowing through this resistance will be
|
(a) 0.25 amp |
(b) 0.5 amp |
(c) 1.0 amp |
(d) 1.5 amp |