Different voltages are applied across a P-N junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current
(a)
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(b)
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(c)
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(d)
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A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)
|
(a) 1 |
(b) 2 |
(c) 5 |
(d) 10 |
In the following circuit, the bulb will become suddenly bright if
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(a) Contact is made or broken |
(b) Contact is made |
|
(c) Contact is broken |
(d) Won't become bright at all |
The phenomena involved in the reflection of radiowaves by ionosphere is similar to:
An extremely hot star would appear to be
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(a) Red |
(b) Blue |
(c) Yellow |
(d) Orange |
Resistance of one carbon filament and one tungsten lamp are measured individually when the lamp are lit and compared with their respective resistances when cold. Which one of the following statements will be true
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(a) Resistance of the carbon filament lamp will increase but that of the tungsten will diminish when hot |
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(b) Resistance of the tungsten filament lamp will increase but that of carbon will diminish when hot |
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(c) Resistances of both the lamps will increase when hot |
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(d) Resistances of both the lamps will decrease when hot |
Complete the equation for the following fission process 
|
(a) |
(b) |
(c) |
(d) |
