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 68

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In the circuit shown, the potential difference between $A$ and $B$ is :

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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 69

A galvanometer having a resistance of

20 Ω

and

30

divisions on both sides has figure of merit

0.005 Ampere per division

. The resistance that should be connected in series such that it can be used as a voltmeter upto

15

V

, is:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 70

Two electric bulbs rated

25 W

,

220 V

and

100 W

,

220 V

are connected in series across a

220 V

voltage source. The

25 W

and

100 W

bulbs now draw

P_{1}

and

P_{2}

powers, respectively.

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 71

In a meter bridge, the wire of length $1 m$ has a non-uniform cross-section such that, the variation $\frac{d R}{d l}$ of its resistance $R$ with length $l$ is $\frac{d R}{d l} \propto \frac{1}{\sqrt{l}} .$ Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point $P .$ What is the length $A P$ ?

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 73

A galvanometer, whose resistance is

50 ohm

, has

25

divisions in it. When a current of

4 \times 10^{- 4}

A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range

2.5 V

it should be connected to a resistance of:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-3>Q 74

In the given circuit diagram, the currents, $I_{1} = 0.3 A, I_{4} = 0.8 A$ and $I_{5} = 0.4 A,$ are flowing as shown. The currents $I_{2}, I_{3}$ and $I_{6},$ respectively, are -