- AMetals increases and of semiconductor decreases.
- BSemeconductors increases and metals decreases.
- CIn both metals and semiconductors increases.
- DIn both metal and semiconductor decreases.
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In the following figure, the magnet is moved towards the coil with a speed v and induced emf is e. If magnet and coil recede away from one another each moving with speed v, the induced emf in the coil will be

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(a) e |
(b) 2e |
(c) e/2 |
(d) 4e |
When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 m away from the photoelectric cell, then
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(a) The stopping potential will be 0.2 V |
(b) The stopping potential will be 0.6 V |
|
(c) The saturation current will be 6 mA |
(d) The saturation current will be 18 mA |
In a forward biased PN-junction diode, the potential barrier in the depletion region is of the form …
(a)
|
(b)
|
(c)
|
(d)
|
The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is
and the wavelength of the
line is
. As the accelerating voltage is increased

|
(a) ( |
(b) ( |
(c) |
(d) |
A magnet is dropped down an infinitely long vertical copper tube
|
(a) The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity |
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(b) The magnet moves with continuously decreasing velocity and ultimately comes to rest |
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(c) The magnet moves with continuously increasing velocity but constant acceleration |
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(d) The magnet moves with continuously increasing velocity and acceleration |
A wire of resistance R is divided in 10 equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be
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(a) 0.01 R |
(b) 0.1 R |
(c) 10 R |
(d) 100 R |
Which logic gate is represented by the following combination of logic gates

|
(a) OR |
(b) NAND |
(c) AND |
(d) NOR |