- AConductor.
- BInsulator.
- CSuper-conductor.
- DFerromagnetic.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The ratio of the refractive index of red light to blue light in air is
|
(a) Less than unity |
|
(b) Equal to unity |
|
(c) Greater than unity |
|
(d) Less as well as greater than unity depending upon the experimental arrangement |
No bias is applied to a P-N junction, then the current
|
(a) Is zero because the number of charge carriers flowing on both sides is same |
|
(b) Is zero because the charge carriers do not move |
|
(c) Is non-zero |
|
(d) None of these |
Select the correct statement
|
(a) In a full wave rectifier, two diodes work alternately |
|
(b) In a full wave rectifier, two diodes work simultaneously |
|
(c) The efficiency of full wave and half wave rectifiers is same |
|
(d) The full wave rectifier is bi-directional. |
The permanent magnet is made from which one of the following substances
| (a) Diamagnetic | (b) Paramagnetic | (c) Ferromagnetic | (d) Electromagnetic |
The magnetic susceptibility does not depend upon the temperature in
|
(a) Ferrite substances |
(b) Ferromagnetic substances |
|
(c) Diamagnetic substances |
(d) Paramagnetic substances |
Assertion : In all conductors, for studying the thermoelectric behaviour or metals, lead is taken as a reference metal.
Reason : In lead, the Thomson effect is negative.
|
(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. |
Assertion : A laser beam 0.2 W power can drill holes through a metal sheet, whereas 1000 W torch-light cannot.
Reason : The frequency of laser light is much higher then that of torch light.
|
(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. |
In the given nuclear reaction A, B, C, D, E represents
|
(a) A = 234, B = 90, C = 234, D = 91, E = β |
|
(b) A = 234, B = 90, C = 238, D = 94, E = α |
|
(c) A = 238, B = 93, C = 234, D = 91, E = β |
|
(d) A = 234, B = 90, C = 234, D = 93, E = α |