Current Electricity Test

Result

Current Electricity Test - 33

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

A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivityof the material is

A
4.4 × 10^–6 ohm × m

B
2.2 × 10^–6 ohm × m

C
1.1 × 10^–6 ohm × m

D
0.22 × 10^–6 ohm × m

Solution
Question 2
4 / -1

A certain wire has a resistance R. The resistance of another wire identical with the first except having twice its diameter is

A
2 R

B
0.25 R

C
4 R

D
0.5 R

Solution
Question 3
4 / -1

In hydrogen atom, the electron makes 6.6 × 10¹⁵revolutions per second around the nucleus in an orbit of radius 0.5 × 10^–10 m . It is equivalent to a current nearly

A
1 A

B
lmA

C
l μA

D
1.6 × 10^–19A

Solution
Question 4
4 / -1

A wire of length 5 m and radius 1 mm has a resistance of 1 ohm. What length of the wire of the same material at the same temperature and of radius 2 mm will also have a resistance of 1 ohm

A
1.25 m

B
2.5 m

C
10 m

D
20 m

Solution
Question 5
4 / -1

Metals have

A
Zero resistivity

B
High resistivity

C
Low resistivity

D
Infinite resistivity
Question 6
4 / -1

Consider a rectangular slab of length L and area of cross-section A. A current I is passed through it. If the length is doubled, the potential drop across the endfaces

A
Becomes half of the initial value

B
Becomes one-fourth of the initial value

C
Becomes double the initial value

D
Remains same

Solution
Question 7
4 / -1

A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire

A
nR

B
n²R

C
2nR

D
2 n²R

Solution
Question 8
4 / -1

A metallic block has no potential difference applied across it, then the mean velocity of free electrons is (T = absolute temperature of the block)

A
Proportional to T

B
Proportional to √T

C
Zero

D
Finite but independent of temperature

Solution
Question 9
4 / -1

The drift velocity of the electrons in a copper wire of length 2 m under the application of a potential difference of 200 V is 0.5 ms^–1. Their mobility is(in m²V^–1s^–1)

A
2.5 × 10^–3

B
2.5 × 10^–2

C
5 × 10²

D
5 ×10^–3

Solution
Question 10
4 / -1

The resistance of a metal increases withincreasing temperature because

A
The collisions of the conducting electrons with the electrons increase

B
The collisions of the conducting electrons with the lattice consisting of the ions of the metal increase

C
The number of conduction electrons decreases

D
The number of conduction electrons increases

Solution