In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of 6Ω, the balance is obtained across 50 cm of the wire. The internal resistance of the cell is
|
(a) 0.5 Ω |
(b) 0.6 Ω |
(c) 1.2 Ω |
(d) 1.5 Ω |
(c) 1.2 Ω
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If λ =10Å, then it corresponds to
|
(a) Infra-red |
(b) Microwave |
(c) Ultra-violet |
(d) X-rays |
If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 2 : 9 |
(d) 9 : 2 |
If 
and 
are the number of electrons and holes in a semiconductor heavily doped with phosphorus, then
|
(a) |
(b) |
(c) |
(d) |
Given three equal resistors, how many different combination of all the three resistors can be made
|
(a) Six |
(b) Five |
(c) Four |
(d) Three |
Assertion : The phenomenon of X-ray production is basically inverse of photoelectric effect.
Reason : X-rays are electromagnetic waves.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Five resistors are connected as shown in the diagram. The equivalent resistance between A and B is
| (a) 6 ohm | (b) 9 ohm |
(c) 12 ohm |
(d) 15 ohm |
A proton and an α - particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 μ sec to make 5 revolutions, then the periodic time for the α - particle would be
|
(a) 50 μ sec |
(b) 25 μ sec |
(c) 10 μ sec |
(d) 5 μ sec |
