The correct symbol for zener diode is
|
(a) |
(b) |
(c) |
(d) |
The correct symbol for zener diode is
|
(a) |
(b) |
(c) |
(d) |
(a)
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Photon of 5.5 eV energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0 eV. The stopping voltage required for these electrons are
|
(a) 5.5 V |
(b) 1.5V |
(c) 9.5V |
(d) 4.0V |
In nuclear reactions, we have the conservation of
|
(a) Mass only |
(b) Energy only |
|
(c) Momentum only |
(d) Mass, energy and momentum |
Fraunhofer lines are obtained in
|
(a) Solar spectrum |
(b) The spectrum obtained from neon lamp |
|
(c) Spectrum from a discharge tube |
(d) None of the above |
The plates of a capacitor are charged to a potential difference of 320 volts and are then connected across a resistor. The potential difference across the capacitor decays exponentially with time. After 1 second the potential difference between the plates of the capacitor is 240 volts, then after 2 and 3 seconds the potential difference between the plates will be
|
(a) 200 and 180 V |
(b) 180 and 135 V |
(c) 160 and 80 V |
(d) 140 and 20 V |
For a cell, the graph between the potential difference (V) across the terminals of the cell and the current (I) drawn from the cell is shown in the figure. The e.m.f. and the internal resistance of the cell are
|
(a) 2V, 0.5Ω |
(b) 2V, 0.4 Ω |
(c) >2V, 0.5 Ω |
(d) > 2V, 0.4 Ω |
A wavefront presents one, two and three HPZ at points A, B and C respectively. If the ratio of consecutive amplitudes of HPZ is 4 : 3, then the ratio of resultant intensities at these point will be
|
(a) 169 : 16 : 256 |
(b) 256 : 16 : 169 |
(c) 256 : 16 : 196 |
(d) 256 : 196 : 16 |
In a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is
|
(a) Violet |
(b) Red |
|
(c) The mean colour |
(d) All the colours together |