Copper wire is used as connecting wire because :

copper has low electrical resistivity

copper has high electrical resistivity

copper has low electrical resistivity

copper has low electrical conductivity

copper has high value of elasticity

The specific resistance of a conductor increases with :

increase in cross-sectional area

decrease in cross-sectional area

In questions 38, the maximum value of current (l max ) is given by the condition :

l max = α - \(\frac{β^2}{2γ}\)

l max = α - \(\frac{β^2}{2α}\)

l max = α - \(\frac{γ^2}{2β}\)

CBSE Class 12 Physics Current Electricity Quiz 4

6.

In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :

4 Ω

2 Ω

1 Ω

\(\frac{1}{2}\) Ω

1.

The temperature coefficient of resistance is expressed in :

2.

Copper wire is used as connecting wire because :

3.

The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :

4.

The phenomenon of super-conductivity was discovered by :

5.

The specific resistance of a conductor increases with :

6.

In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :

7.

Two conductors of equal length and radii the ratio of 2 : 3 are; connected in parallel the source of electricity. The ratio of the velocity of electrons in the conductor be :

8.

In questions 38, the maximum value of current (l_max) is given by the condition :

9.

In questions 38, the line (t) after which the value of current reaches a maximum values given by :

10.

The smallest resistance that can be obtained by the combination of n resistors each resistance r is :

Time

1. The temperature coefficient of resistance is expressed in :

2. Copper wire is used as connecting wire because :

3. The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :

4. The phenomenon of super-conductivity was discovered by :

5. The specific resistance of a conductor increases with :

6. In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :

7. Two conductors of equal length and radii the ratio of 2 : 3 are; connected in parallel the source of electricity. The ratio of the velocity of electrons in the conductor be :

8. In questions 38, the maximum value of current (lmax) is given by the condition :

9. In questions 38, the line (t) after which the value of current reaches a maximum values given by :

10. The smallest resistance that can be obtained by the combination of n resistors each resistance r is :

Time

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1.

The temperature coefficient of resistance is expressed in :

2.

Copper wire is used as connecting wire because :

3.

The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :

4.

The phenomenon of super-conductivity was discovered by :

5.

The specific resistance of a conductor increases with :

6.

In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :

7.

Two conductors of equal length and radii the ratio of 2 : 3 are; connected in parallel the source of electricity. The ratio of the velocity of electrons in the conductor be :

8.

In questions 38, the maximum value of current (l_max) is given by the condition :

9.

In questions 38, the line (t) after which the value of current reaches a maximum values given by :

10.

The smallest resistance that can be obtained by the combination of n resistors each resistance r is :