Current Electricity Test

Result

Current Electricity Test - 81

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

The relaxation time in conductors

A
Increases with the increase of temperature

B
Decreases with the increase of temperature

C
It does not depend on temperature

D
All of sudden changes at 400 K

Solution
Question 2
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 3
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 4
4 / -1

The resistance of a wire is 10 Ω. Its length is increased by 10% by stretching. The new resistance will now be

A
12 Ω

B
1.2 Ω

C
13 Ω

D
11 Ω

Solution
Question 5
4 / -1

Resistance of tungsten wire at 150°C is 133 Ω. Its resistance temperature coefficient is 0.0045/°C. Theresistance of this wire at 500°C will be

A
180 Ω

B
225 Ω

C
258 Ω

D
317 Ω

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

The resistance of a wire is R. If the length of the wire is doubled by stretching, then the new resistance will be

A
2R

B
4R

C
R

D
R/4

Solution
Question 10
4 / -1

Which of the following has a negative temperature coefficient?

A
C

B
Fe

C
Mn

D
Ag