AM is used for broadcasting because
|
(a) It is more noise immune than other modulation systems |
|
(b) It requires less transmitting power compared with other systems |
|
(c) Its use avoids receiver complexity |
|
(d) No other modulation system can provide the necessary bandwidth faithful transmission |
(c) Its use avoids receiver complexity
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When a plane mirror is placed horizontally on a level ground at a distance of 60 m from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of 90° at the eye. The height of the tower will be
| (a) 30 m | (b) 60 m | (c) 90 m | (d) 120 m |
When a dielectric material is introduced between the plates of a charged condenser then electric field between the plates
|
(a) Decreases |
(b) Increases |
(c) Remain constant |
(d) First (b) then (a) |
Assertion : If three capacitors of capacitance C1 < C2 < C3 are connected in parallel then their equivalent capacitance Cp > Cs
Reason : 
|
(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. |
Through which character we can distinguish the light waves from sound waves
|
(a) Interference |
(b) Refraction |
(c) Polarisation |
(d) Reflection |
In an isolated parallel plate capacitor of capacitance C, the four surface have charges 
and 
as shown. The potential difference between the plates is
|
(a) |
(b) |
(c) |
(d) |
