Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32o. The second order diffraction will be seen at
|
(a) 48o |
|
(b) 64o |
|
(c) 80o
|
|
(d) There is no second order diffraction in this case |
(d) There is no second order diffraction in this case
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion : Through the same current flows through the line wires and the filament of the bulb but heat produced in the filament is much higher then that in line wires.
Reason : The filament of bulbs is made of a material of high resistance and high melting point.
|
(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. |
The reverse biasing in a PN junction diode
| (a) Decreases the potential barrier |
|
(b) Increases the potential barrier |
|
(c) Increases the number of minority charge carriers |
|
(d) Increases the number of majority charge carriers |
Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be
|
(a) More with 40 bulbs than with 39 |
(b) More with 39 bulbs than with 40 |
|
(c) Equal in both the cases |
(d) In the ratio of |
Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current
|
(a) 1.1 mA |
(b) 1.01 mA |
(c) 0.01 mA |
(d) 10 mA |
If the de-Broglie wavelengths for a proton and for a α - particle are equal, then the ratio of their velocities will be
|
(a) 4 : 1 |
(b) 2 : 1 |
(c) 1 : 2 |
(d) 1 : 4 |
