Current Electricity Test

Result

Current Electricity Test - 83

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Weekly Quiz Competition

Question 1
4 / -1

In a neon discharge tube 2.9 × 10¹⁸ Ne⁺ ions move to the right each second while 1.2 × 10¹⁸, electrons move to the left per second. Electron charge is 1.6 × 10^–19 C. The current in the discharge tube

A
1 A towards right

B
0.66 A towards right

C
0.66 A towards left

D
Zero

Solution
Question 2
4 / -1

A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is/are

A
Current, electric field and drift speed

B
Drift speed only

C
Current and drift speed

D
Current only

Solution
Question 3
4 / -1

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

A
R_alloy = R_metal

B
R_alloymetal

C
There is no simple relation between R_alloy and R_metal

D
R_alloy> R_metal
Question 4
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 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 of the wire is 0.002 per °C]

A
36°C

B
83°C

C
63°C

D
33° C

Solution
Question 6
4 / -1

The colour code for a resistor of resistance 3.5k Ω with5% tolerance is

A
Orange, green, red and gold

B
Red, yellow, black and gold

C
Orange, green, orange and silver

D
Orange, green, red and silver
Question 7
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 8
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 9
4 / -1

Masses of three wires of copper are in the ratio of 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are

A
1 : 3 : 5

B
5 : 3 : 1

C
1 : 15 : 125

D
125 : 15 : 1

Solution
Question 10
4 / -1

Conductivity increases in the order of

A
Al, Ag, Cu

B
Al, Cu, Ag

C
Cu, Al, Ag

D
Ag, Cu, Al