A coil and a bulb are connected in series with a dc source, a soft iron core is then inserted in the coil. Then
|
(a) Intensity of the bulb remains the same |
(b) Intensity of the bulb decreases |
|
(c) Intensity of the bulb increases |
(d) The bulb ceases to glow |
(b) Intensity of the bulb decreases
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 ohm and 2 ohm respectively. Then the resistances of the component resistors are
|
(a) 2 ohm and 7 ohm |
(b) 3 ohm and 6 ohm |
(c) 3 ohm and 9 ohm |
(d) 5 ohm and 4 ohm |
Two point sources X and Y emit waves of same frequency and speed but Y lags in phase behind X by 2pl radian. If there is a maximum in direction D the distance XO using n as an integer is given by
|
(a) |
(b) |
(c) |
(d) |
Function of rectifier is
|
(a) To convert ac into dc |
(b) To convert dc into ac |
|
(c) Both (a) and (b) |
(d) None of these |
A plane wavefront (λ = 6 
falls on a slit 0.4 mm wide. A convex lens of focal length 0.8 m placed behind the slit focusses the light on a screen. What is the linear diameter of second maximum
|
(a) 6mm |
(b) 12 mm |
(c) 3 mm |
(d) 9 mm |
