Current Electricity (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 1 - 4 of 9

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Question number: 1

» Current Electricity » Electrical Energy and Power

Appeared in Year: 2011

MCQ▾

Question

In the circuit shown below the resistances are given in ohms and the battery is assumed ideal with emf equal to 3.0 volts. The resistor that dissipates the most power is

Circuit diagram of 5 resistors

Circuit Diagram of 5 Resistors

In above figure circuit of combination of five resistors are shown.

Choices

Choice (4) Response
a.

R1

b.

R2

c.

R4

d.

R3

Question number: 2

» Current Electricity » Series and Parallel Combinations of Resistors

Appeared in Year: 2011

MCQ▾

Question

Two batteries V1 and V2 are connected to three resistors as shown below.

Circuit diagram consist of two batteries and three resistors

Circuit Diagram Consist of Two Batteries and Three Resistors

In figure combination of three resistors are connected with two batteries.

If V1=2V and V2=0V, the current I=3mA . If V1=0V and V2=4V , the current I=4mA. Now, if V1=10V and V2=10V , the current I will be –

Choices

Choice (4) Response
a.

7mA

b.

25mA

c.

15mA

d.

20mA

Question number: 3

» Current Electricity » Electrical Resistance

Appeared in Year: 2011

MCQ▾

Question

The Quantum Hall Resistance RH is a fundamental constant with dimensions of resistance. If h is Planck’s constant and e the electron charge, then the dimension of RH is the same as -

Choices

Choice (4) Response
a.

eh2

b.

he2

c.

h2e

d.

e2h

Question number: 4

» Current Electricity » Temperature Dependence of Resistance

Appeared in Year: 2012

MCQ▾

Question

A steady current Ι flows through a wire of radius r, length L and resistivity ρ. The current produces heat in the wire. The rate of heat loss in a wire is proportional its surface area. The steady temperature of the wire is independent of

Choices

Choice (4) Response
a.

L

b.

r

c.

I

d.

p

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