A carbon resistor of 47 ± 4.7 kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be:

Yellow - Violet - Orange - Silver

Violet - Yellow - Orange - Silver

E M B I B E

Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 35

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Two conductors have the same resistance at $0 ° C$ but their temperature coefficients of resistance are $α_{1}$ and $α_{2}$ . The respective temperature coefficients of their series and parallel combinations are nearly

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Important Questions on Current Electricity

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 36

If wire is stretched to make it

0.1 %

longer, its resistance will

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 38

Two electric bulbs marked

25 W - 220 V

and

100 W - 220 V

are connected in series to a

440 V

supply. Which of the bulbs will fuse?

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 39

This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement I. Higher the range, greater is the resistance of ammeter.

Statement II. To increase the range of ammeter, additional shunt needs to be used across it.

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 40

The supply voltage to a room is

120 V

. The resistance of the lead wires is

6 Ω

. A

60 W

bulb is already switched on. What is the decrease of voltage across the bulb, when a

240 W

heater is switched on in parallel to the bulb?

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 41

In a large building, there are

15

bulbs of

40 W

,

5

bulbs of

100 W

,

5

fans of

80 W

and

1

heater of

1 kW

. The voltage of the electric mains is

220 V

. The minimum capacity of the main fuse of the building will be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 42

When

5 V

potential difference is applied across a wire of length

0.1 m

, the drift speed of electrons is

2.5 \times 10^{- 4} m s^{- 1}

. If the electron density in the wire is

8 \times 10^{28} m^{- 3}

, the resistivity of the material is close to

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 43

In the circuit shown below, the current in the $1 Ω$ resistor is

Question Image

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 44

A galvanometer having a coil resistance of $100 Ω$ gives a full-scale deflection, when a current of $1 mA$ is passed through it. The value of the resistance, which can convert this galvanometer into an ammeter giving a full-scale deflection for a current of $10 A,$ is