JEE 2020 Revision: Current Electricity - 1

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Question 1

Four identical cells of enf E and internal resistance r are to be connected in series. Suppose if one of the cell is connected wrongly, the equivalent emf and effective internal resistance of the combination is

• A4E and 2r
• B2E and 2r
• C4E and 4r
• D2E and 4r

Question 2

In the circuit shown below, the ammeter and the voltmeter readings are 3 A and 6 V respectively. Then the value of the resistance R is

• A> 2Ω
• B ≥ 2Ω
• C2 Ω
• D< 2 Ω

Question 3

A carbon film resistor has colour code Green Black Violet Gold. The value of the resistor is

• A500 5% MΩ
• B50 MΩ
• C500 10% MΩ
• D500 MΩ

Question 4

In the circuit shown, the currents i₁ and i₂ are

• Ai₁ =1.5A, i₂ = 0.5A
• Bi₁ = 0.5 A, i₂ = 1.5 A
• Ci₁ =1A, i₂ = 3A
• Di₁ = 3A, i₂ = 1 A

Question 5

A conductor wire having 10²⁹ free electrons/m³ carries a current of 20 A. If the cross-section of the wire is mm², then the drift velocity of electrons will be (e = 1.6×10^-19 C)

• A1.25×10^-4 ms^-1
• B1.25×10^-3 ms^-1
• C1.25×10^-5 ms^-1
• D6.25×10^-3 ms^-1

Question 6

The voltage V and current I graphs for a conductor at two different temperatures T₁ and T₂ are shown in the figure. The relation between T₁ and T₂ is

• AT₁ > T₂
• BT₁ < T₂
• CT₁ = T₂
• DT₁=

Question 7

The deflection in a moving coil galvanometer is reduced to half when it is shunted with a 40Ω coil. The resistance of the galvanometer is

• A80 Ω
• B40 Ω
• C20 Ω
• D15 Ω

Question 8

A current of A produces a deflection of 60 º in a tangent galvanometer. The reduction factor is

• AA
• BA
• C2 A
• DA

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