Current Electricity Test

Result

Current Electricity Test - 35

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Weekly Quiz Competition

Question 1
4 / -1

An electric wire of length ‘L’ and area of cross-section a has a resistance R ohm. Another wire of the same material having same length and area of cross-section 4a has a resistance of

A
4R

B
R/4

C
R/16

D
16R

Solution
Question 2
4 / -1

For which of the following the resistance decreases on increasing the temperature?

A
Copper

B
Tungsten

C
Germanium

D
Aluminum
Question 3
4 / -1

If n, e, τ and m respectively represent the density, charge relaxation time and mass of the electron, then the resistance of a wire of length land area of cross-section A will be

A

B

C

D

Solution
Question 4
4 / -1

Which of the following statements is correct?

A
Liquids obey fully the ohm's law

B
Liquids obey partially the ohm's law

C
There is no relation between current and p.d. for liquids

D
None of the above
Question 5
4 / -1

A certain piece of silver of given mass is to be made like a wire. Which of the following combinations of length (L) and the area of cross-section (A) will lead to the smallest resistance

A
L and A

B
2L and A/2

C
L/2 and 2A

D
Any of the above, because volume of silver remains same

Solution
Question 6
4 / -1

A metal wire of specific resistance 64 × 10^–6 ohm-cmand length 198 cm has a resistance of 7 ohm, the radius of the wire will be

A
2.4 cm

B
0.24 cm

C
0.024 cm

D
24 cm

Solution
Question 7
4 / -1

A copper wire of length 1 m and radius 1 mm is joined in series with an iron wire of length 2 m and radius 3 mm and a current is passed through the wires. The ratio of the current density in the copper and iron wires is

A
18 : 1

B
9 : 1

C
6 : 1

D
2 : 3

Solution
Question 8
4 / -1

For a metallic wire, the ratio V/i (V = the applied potential difference, i = current flowing) is

A
Independent of temperature

B
Increases as the temperature rises

C
Decreases as the temperature rises

D
Increases or decreases as temperature rises, depending upon the metal

Solution
Question 9
4 / -1

Which of the following has a negative temperature coefficient?

A
C

B
Fe

C
Mn

D
Ag
Question 10
4 / -1

The reciprocal of resistance is

A
Conductance

B
Resistivity

C
Voltage

D
None of these