The image which can be obtained on a screen is called:
- AA virtual image
- BA real image
- CEither a real or a virtual image
- DNeither a real nor a virtual image
The image which can be obtained on a screen is called:
Explanation:
The image which can be obtained on a screen is called a real image.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The expected energy of the electrons at absolute zero is called
|
(a) Fermi energy |
(b) Emission energy |
(c) Work function |
(d) Potential energy |
In the middle of the depletion layer of a reverse-biased PN junction, the
|
(a) Potential is zero |
(b) Electric field is zero |
|
(c) Potential is maximum |
(d) Electric field is maximum |

Assertion : If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitor becomes 6 times.
Reason : Capacity of the capacitor does not depend upon the nature of the material.
|
(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. |
A laser beam is used for carrying out surgery because it
|
(a) Is highly monochromatic |
(b) Is highly coherent |
|
(c) Is highly directional |
(d) Can be sharply focussed |
Assertion : Lenz’s law violates the principle of conservation of energy.
Reason : Induced e.m.f., opposes always the change in magnetic flux responsible for its production.
|
(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 assertion is false but reason is true. |
Can a metal be used as a medium for dielectric
|
(a) Yes |
(b) No |
(c) Depends on its shape |
(d) Depends on dielectric |