Question # 1

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

The fraction change in resistance per Kelvin is known as:

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Temperature coefficient of Resistance

Coefficient of voltage of change

Thermal expansion

All of the above

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

Thermosouple is an arrangement of two different metals:

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Two convert heat energy into electrical energy

To produce more heat

To convert heat energy into chemical energy

To convert electrical energy into heat energy

Unit (S.I) of temperature coefficient of resistivity of a material is

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K

K^-1

^oC

K^-2

If 1 x 10⁷ electrons passes through a conductor in 1.0 micro second , then the current is.

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2 A

1.6 A

2.6 x 10^-6 A

1.6 x 10^-6 A

In carbon resistors, then value of Blue colour is.

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6

7

8

9

Three resistors of resistance R each are combined in various ways, Which of the following cannot be obtained?

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3 RΩ

2R /4Ω

R/3Ω

2R /3Ω

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

During electrolysis process, density of CuSO₄ solution

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Remains constant

Decreased

Increased

None of these

The resistivity of --------------------decrease with the increase in temp

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Gold

Silver

Copper

Silicon

The vessel containing the tow electrodes and liquid to known as.

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Chemical cell

Volt cell

Volta cell

Volta meter

Terminal potential difference is greater than emf of the cell when

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Circuit is open

Circuit is closed

small battery is charged by bigger battery

None of these

Kirchhoff's first rule is the manifestation of the law of conservation of.

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Mass

Charge

Energy

Momentum

Electric power:

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Vx1

V²x1

V/1

V/1²

Specific resistance of a material depends upon.

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Length

Area

Temperature

Both A and B

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