Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 62

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A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

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Important Questions on Current Electricity

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 63

A

5 A

current is setup in an external circuit by a

6 V

storage battery for

6 \min

. The chemical energy of the battery is reduced by

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 64

Two bars of radii

r

and

2 r

are kept in contact as shown. An electric current

I

is passed through the bars. Which one of following is correct?

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 65

Two bulbs

25 W

,

220 V

and

100 W

,

220 V

are given. Which one of them has a higher resistance?

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 66

The thermocouple, among the following, that can produce maximum thermo-emf for the same temperature difference between the junction, is

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 67

Two electric bulbs, each designed to operate with a power of

500 W

in a

220 V

line are connected in series to a

110 V

line. The power generated by each bulb will be:

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 68

In the circuit shown, the heat produced in the

5 Ω

resistor due to current flowing in it is

10 c a l s^{- 1}

. The heat generated in the

4 Ω

resistor is:

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 69

Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature,

100 W, 60 W

and

40 W

bulbs have filament resistances

R_{100}, R_{60}

and

R_{40}

, respectively, the relation between these resistances is

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 70

An electric bulb is rated

220 V - 100 W

. The power consumed by it when operated on

110 V

will be