Question # 1

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery

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

The resistivity of two wires isρ₁ andρ₂ which are connected in series. If there dimentions are same then the equivalent resistivity of the combination will be:

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(ρ₁ +ρ₂)

1/ρ₁+ 1/ρ₂

ρ₁+ρ₂/2

ρ_1/ρ₂

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

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

Resistivity at a given temperature depends upon.

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Area of cross section

Length

Nature of material of conductor

Both length and area

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

The conventional current is due to the flow of

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Atoms and molecules

Positive charge

Negative charge

Bot (b) and (c)

The current flowing through each resistor of equal resistance in parallel combination is.

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Same

Different

Zero

Infinite

The free electrons experience force.

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In direction of -E

In direction of E

Both A and B

All of the above

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

The color code of "Green"

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8

3

5

7

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

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

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K

K^-1

^oC

K^-2

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

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

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Gold

Silver

Copper

Silicon

A certain wire has a resistance R, the resistivity of an other wire of an identical material with the first, except for twice its diameter is.

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1/4 R

4R

2R

Same as R

Colour codes are used to calculate the.

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Nature of resistor

Numerical value of resistance

Potential difference

Current

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