# The resistance of platinum wire at 0$°\mathrm{C}$ is 22.05 $\mathrm{\Omega }$ and at 100$°\mathrm{C}$ it becomes 22.70 $\mathrm{\Omega }$. When the wire is heated to a temperature of t$°\mathrm{C}$ the resistance of wire becomes 24.91$\mathrm{\Omega }$. The value of t is  1.  220 2.  440 3.  310 4.  550

Subtopic:  Derivation of Ohm's Law |
62%
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The sensitivity of a potentiometer can be increased by

1.  increasing the potential gradient

2.  decreasing the length of potentiometer wire

3.  decreasing the current in the potentiometer wire

4.  all of these

Subtopic:  Meter Bridge & Potentiometer |
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1.  36V

2.  18V

3.  9V

4.  Zero

Subtopic:  Heating Effects of Current |
64%
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A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second

1.

2.

3.

4.

Subtopic:  Current & Current Density |
78%
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The drift velocity of free electrons in a conductor is $$v$$ when a current $$i$$ is flowing in it. If both the radius and current are doubled, then the drift velocity will be:
1.  $$v$$
2. $$\frac{v}{2}$$
3. $$\frac{v}{4}$$
4. $$\frac{v}{8}$$

Subtopic:  Current & Current Density |
72%
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A battery has e.m.f. 4 V and internal resistance r. When this battery is connected to an external resistance of 2 ohm, a current of 1 ampere flows in the circuit. How much current will flow if the terminals of the battery are connected directly?

 1 1 A 2 2 A 3 4 A 4 Infinite
Subtopic:  EMF & Terminal Voltage |
66%
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The current I as shown in the circuit will be:

1.  10 A

2.  $\frac{20}{3}$ $\mathrm{A}$ 

3.  $\frac{2}{3}$ $\mathrm{A}$  

4.  $\frac{5}{3}$ $\mathrm{A}$

Subtopic:  Combination of Resistors |
60%
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A meter bridge is set up to determine unknown resistance x using a standard 10 $\Omega$ resistor. The galvanometer shows the null point when the tapping key is at a 52 cm mark. End corrections are 1 cm and 2 cm respectively for end A and B. Then the value of x is:

1.  10.2 $\Omega$

2.  10.6 $\Omega$

3.  10.8 $\Omega$

3. 11.1 $\Omega$

Subtopic:  Meter Bridge & Potentiometer |
52%
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If I be the current limit of a fuse wire of length l and radius r, then select the appropriate relation

(1)

(2)

(3)

(4)

Subtopic:  Heating Effects of Current |
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Which of the following graph correctly represents the variation of mobility $\left(\mathrm{\mu }\right)$ of electrons with applied electric field (E) in a metallic conductor?

 1 2 3 4
Subtopic:  Current & Current Density |
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