Current Electricity Test

Result

Current Electricity Test - 37

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Weekly Quiz Competition

Question 1
4 / -1

The resistivity of alloys = R_alloy;the resistivity ofconstituent metals R_metal . Then, usually

A
R_alloy = R_metal

B
R_alloy< R_metal

C
There is no simple relation between R_alloy andR_metal

D
R_alloy>R_metal
Question 2
4 / -1

Two wires A and B of same material and same mass have radii 2r and r respectively. If resistance of wire A is 34 Ω, then resistance of B will be

A
544 Ω

B
272 Ω

C
68 Ω

D
17 Ω

Solution
Question 3
4 / -1

Two rods of same material and length have their electric resistances in ratio 1:2. When both rods are dipped in water, the correct statement will be

A
A has more loss of weight

B
B has more loss of weight

C
Both have same loss of weight

D
Loss of weight will be in the ratio 1: 2

Solution
Question 4
4 / -1

Two different conductors have same resistance at 0°C. It is found that the resistance of the first conductor at t₁° C is equal to the resistance of the second conductor at t₂° C. The ratio of the temperature coefficients of resistance of the conductors, α₁/α₂ is

A

B

C

D

Solution
Question 5
4 / -1

The resistance of a wire at room temperature 30° C is found to be 10 Ω. Now to increase the resistance by 10%, the temperature of the wire must be [The temperature coefficient of resistance of the material ofthe wire is 0.002 per °C]

A
36°C

B
83°C

C
63°C

D
33° C

Solution
Question 6
4 / -1

A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by v_P and v_Q respectively,then

A

B

C

D

Solution
Question 7
4 / -1

If an electric current is passed through a nerve of a man, then man

A
Begins to laugh

B
Begins to weep

C
Is excited

D
Becomes insensitive to pain
Question 8
4 / -1

The mobility of free electrons (charge e, mass m and relaxation time T) in a metal is proportional to

A

B

C

D
Question 9
4 / -1

The resistance of a conductor is 5 ohm at 50°C and 6 ohm at 100°C. Its resistance at 0°C is

A
1 ohm

B
2 ohm

C
3 ohm

D
4 ohm

Solution
Question 10
4 / -1

A block has dimensions 1 cm, 2 cm, 3 cm. Ratio of the maximum resistance to minimum resistance between any point of opposite faces of this block is

A
9 : 1

B
1 : 9

C
18 : 1

D
1 : 6

Solution