The electrical circuits used to get smooth d.c. output from a rectifier circuit is called
|
(a) Filter |
(b) Amplifier |
(c) Full wave rectifier |
(d) Oscillator |
(b) Amplifier
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The power rating of an electric motor which draws a current of 3.75 amperes when operated at 200 V is about
|
(a) 1 H.P. |
(b) 500 W |
(c) 54 W |
(d) 750 H.P. |
In hydrogen atom, when electron jumps from second to first orbit, then energy emitted is
|
(a) – 13.6 eV |
(b) – 27.2 eV |
(c) – 6.8 eV |
(d) None of these |
A point object is placed at a distance of 30cm from a convex mirror of focal length 30cm. The image will form at:
Between the plates of a parallel plate capacitor a dielectric plate is introduced just to fill the space between the plates. The capacitor is charged and later disconnected from the battery. The dielectric plate is slowly drawn out of the capacitor parallel to the plates. The plot of the potential difference across the plates and the length of the dielectric plate drawn out is
|
(a)
|
(b)
|
(c)
|
(d)
|
In charging a battery of motor-car, the following effect of electric current is used
|
(a) Magnetic |
(b) Heating |
(c) Chemical |
(d) Induction |
An oscillator circuit consists of an inductance of 0.5mH and a capacitor of 20 μF. The resonant frequency of the circuit is nearly
|
(a) 15.92 Hz |
(b) 159.2 Hz |
(c) 1592 Hz |
(d) 15910 Hz |
When a slab of dielectric material is introduced between the parallel plates of a capacitor which remains connected to a battery, then charge on plates relative to earlier charge
|
(a) Is less |
|
(b) Is same |
|
(c) Is more |
|
(d) May be less or more depending on the nature of the material introduced |
