- ACircular
- BSpherical
- CCylindrical
- DPlane
Explanation:
Due to the large distance, the radius of the wavefront can be considered as large (infinity) and hence, a wavefront is almost plane.
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Find the power of the circuit
|
(a) 1.5 W |
(b) 2 W |
(c) 1 W |
(d) None of these |
The focal length of the objective lens of a compound microscope is
|
(a) Equal to the focal length of its eye piece |
|
(b) Less than the focal length of eye piece |
|
(c) Greater than the focal length of eye piece |
|
(d) Any of the above three |
Average energy stored in a pure inductance L when a current i flows through it, is
|
(a) |
(b) |
(c) |
(d) |
Assertion : Magnetic field interacts with a moving charge and not with a stationary charge.
Reason : A moving charge produces a magnetic field.
|
(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 hollow sphere of charge does not produce an electric field at any
|
(a) Point beyond 2 metres |
(b) Point beyond 10 metres |
|
(c) Interior point |
(d) Outer point |
Laser beams are used to measure long distances because
|
(a) They are monochromatic |
(b) They are highly polarised |
|
(c) They are coherent |
(d) They have high degree of parallelism |