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A piece of copper and another of germanium are cooled from room temperature to 80oK. The resistance of

Each of them increases

Each of them decreases

Copper increases and germanium decreases

Copper decreases and germanium increases

The temperature coefficient of resistance of a wire is 0.00125 peroC. At 300 k, its resistance is I ohm. This resistance of the wire will be 2 ohm at.

1154oK

1100oK

1400oK

1127oK

A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

Both the length and the radius of the wire are halved.

Both the length and the radius of the wire are doubled

The radius of the wire is doubled

The length of the wire is doubled

Read the following statements carefully: Y : The resistively of a semiconductor decreases with increases of temperature. Z: In a conducing solid, the rate of collisions between free electrons and ions increases with increases of temperature Select the correct statement (s) from the following:

Y is true but Z is false

Y is false but Z is true

Both Y and Z are true

Is true and Z is the

A resistance of 2( is connected across one gap of a metrebridge (the length of the wire is 100 cm) and an unknown gap. When these resistances are interchanged, the balance point shift by 20 cm. Neglecting any corrections, the unknown resistance is

3(

4(

5(

6(

According to Kirchhoff’s IInd law, the algebraic sum of e.m.f.’s in any loop of the network is equal to

Zero

The algebraic sum of the IR products

The algebraic sum of the VR products

The algebraic sum of the VI products

Electrical circuits containing simple arrangements of resistances in series or in parallel and with a know source of e.m.f. can be analysed in a straight forward manner by

Kirchhoff’s law

Lenz’s law

Ohm’s law

Ampere’s law

The potentiometer is a device used for accurate comparison of_______

Voltages

Currents

Potential difference

Electrical energy

The resistance of a straight conductor depends on its

Temperature

Length

Material

All of the above

The charge on an electron being 1.6 x 1019 coulomb, current flowing in a circuit is 1 A. What would be the number of electrons flowing through the circuit in 1 sec?

1.6 x 1019

1.6 x 10-19

0.625 X 1019

Each of them increases

Each of them decreases

Copper increases and germanium decreases

Copper decreases and germanium increases

The temperature coefficient of resistance of a wire is 0.00125 peroC. At 300 k, its resistance is I ohm. This resistance of the wire will be 2 ohm at.

1154oK

1100oK

1400oK

1127oK

A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

Both the length and the radius of the wire are halved.

Both the length and the radius of the wire are doubled

The radius of the wire is doubled

The length of the wire is doubled

Read the following statements carefully: Y : The resistively of a semiconductor decreases with increases of temperature. Z: In a conducing solid, the rate of collisions between free electrons and ions increases with increases of temperature Select the correct statement (s) from the following:

Y is true but Z is false

Y is false but Z is true

Both Y and Z are true

Is true and Z is the

A resistance of 2( is connected across one gap of a metrebridge (the length of the wire is 100 cm) and an unknown gap. When these resistances are interchanged, the balance point shift by 20 cm. Neglecting any corrections, the unknown resistance is

3(

4(

5(

6(

According to Kirchhoff’s IInd law, the algebraic sum of e.m.f.’s in any loop of the network is equal to

Zero

The algebraic sum of the IR products

The algebraic sum of the VR products

The algebraic sum of the VI products

Electrical circuits containing simple arrangements of resistances in series or in parallel and with a know source of e.m.f. can be analysed in a straight forward manner by

Kirchhoff’s law

Lenz’s law

Ohm’s law

Ampere’s law

The potentiometer is a device used for accurate comparison of_______

Voltages

Currents

Potential difference

Electrical energy

The resistance of a straight conductor depends on its

Temperature

Length

Material

All of the above

The charge on an electron being 1.6 x 1019 coulomb, current flowing in a circuit is 1 A. What would be the number of electrons flowing through the circuit in 1 sec?

1.6 x 1019

1.6 x 10-19

0.625 X 1019

Questions are from potentiometer, resistivity etc

AIEEE Physics: Current electricity AIPMT Physics XII CBSE Current Electricity IIT JEE Physics: Electricity

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