Question # 1

During electrolysis process, density of CuSO₄ solution

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Remains constant

Decreased

Increased

None of these

The drift velocity is of order:

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10^-13m/s

10³ m/s

10^-3m/s

10^-4m/s

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

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K

K^-1

^oC

K^-2

Which one of the following bulbs has the least resistance.

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100 W

200 W

500 W

1000 W

106 electrons are moving through a wire per second the current developed is:

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1.6 x 10-19 A

1 A

1.6 x 10-13A

106 A

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

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

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140 J

1440 J

14400 J

144000 J

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

The Kirchhoff 1^st rule is manifestation of:

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Law of conservation of mass

Law of Conservation of charge

Law of conservation of energy

None of above

Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is:

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3Ω

4Ω

4.5Ω

5Ω

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

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

The condition for the wheatstone bridge to be balanced is given by

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None of above

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

What is the resistance of carbon resistor which has band brown black brown.

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100 Ohm

1000 Ohm

10 Ohm

1.0 Ohm

Resistance tolerance of silver band is.

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10%

6%

7%

5%

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