The ripple factor in a half wave rectifier is
|
(a) 1.21 |
(b) 0.48 |
(c) 0.6 |
(d) None of these |
The ripple factor in a half wave rectifier is
|
(a) 1.21 |
(b) 0.48 |
(c) 0.6 |
(d) None of these |
(a) 1.21
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Light of two different frequencies whose photons have energies 1eV and 2.5eV respectively, successively illuminates a metal of work function 0.5eV. The ratio of maximum kinetic energy of the emitted electron will be
|
(a) 1 : 5 |
(b) 1 : 4 |
(c) 1 : 2 |
(d) 1 : 1 |
Zener breakdown in a semi-conductor diode occurs when
|
(a) Forward current exceeds certain value |
(b) Reverse bias exceeds certain value |
|
(c) Forward bias exceeds certain value |
(d) Potential barrier is reduced to zero |
Kirchoff’s I law and II law of current, proves the
|
(a) Conservation of charge and energy |
|
(b) Conservation of current and energy |
|
(c) Conservation of mass and charge |
|
(d) None of these |
Wavelength of light of frequency 100Hz
|
(a) 2 |
(b) 3 |
(c) 4 |
(d) 5 |
For skywave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere
|
(a) ~ 1.2 |
(b) ~ |
(c) ~ |
(d) ~ |
Four condensers each of capacity 4μF are connected as shown in figure.
The energy stored in the system is

|
(a) 2400 ergs |
(b) 1800 ergs |
(c) 3600 ergs |
(d) 5400 ergs |
In the circuit shown in the adjoining figure, the current between B and D is zero, the unknown resistance is of
|
(a) 4 Ω |
|
(b) 2 Ω |
|
(c) 3 Ω |
|
(d) em.f. of a cell is required to find the value of X |
A storage battery has e.m.f. 15 volts and internal resistance 0.05 ohm. Its terminal voltage when it is delivering 10 ampere is
|
(a) 30 volts |
(b) 1.00 volts |
(c) 14.5 volts |
(d) 15.5 volts |