Diode is used as a/an
|
(a) Oscillator |
(b) Amplifier |
(c) Rectifier |
(d) Modulator |
Diode is used as a/an
|
(a) Oscillator |
(b) Amplifier |
(c) Rectifier |
(d) Modulator |
(c) Rectifier
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In the spectrum of hydrogen atom, the ratio of the longest wavelength in Lyman series to the longest wavelength in the Balmer series is
| (a) 5/27 | (b) 1/93 |
(c) 4/9 |
(d) 3/2 |
Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are
|
(a) Planes parallel to yz-plane |
|
(b) Planes parallel to xy-plane |
|
(c) Planes parallel to xz-plane |
|
(d) Coaxial cylinders of increasing radii around the x-axis |
Which is the correct relation for forbidden energy gap in conductor, semi conductor and insulator
|
(a) |
|
(b) |
|
(c) |
|
(d) |
The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40KeV electrons, is approximately (h = 6.63
)
|
(a) 300 Å |
(b) 10 Å |
(c) 4 Å |
(d) 0.31 Å |
Total internal reflection of a ray of light is possible when the (
= critical angle, i = angle of incidence)
|
(a) Ray goes from denser medium to rarer medium and |
|
(b) Ray goes from denser medium to rarer medium and |
|
(c) Ray goes from rarer medium to denser medium and |
|
(d) Ray goes from rarer medium to denser medium and |
Four wires AB, BC, CD, DA of resistance 4 ohm each and a fifth wire BD of resistance 8 ohm are joined to form a rectangle ABCD of which BD is a diagonal. The effective resistance between the points A and B is
|
(a) 24 ohm |
(b) 16 ohm |
(c) |
(d) |

As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is
|
(a) 1.51 |
(b) 13.6 |
(c) 40.8 |
(d) 122.4 |