Current Electricity (BITSAT Physics): Questions 1 - 5 of 13

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Question number: 1

» Current Electricity » Electrical Energy and Power

MCQ▾

Question

If current flowing in a conductor changes by 1% , then power will change by –

Choices

Choice (4) Response

a.

10%

b.

2%

c.

1%

d.

100%

Question number: 2

» Current Electricity » Electric Current

MCQ▾

Question

When the key K is pressed at time t=0 , then which of the following statement about the current I in the resistor AB of the given circuit is true?

Circuit diagram of two resistors and a capacitor

Circuit Diagram of Two Resistors and a Capacitor

In figure a circuit diagram of two resistors and a capacitor is shown.

Choices

Choice (4) Response

a.

I oscillates between 1mA and 2mA

b.

I=1mA at all t

c.

At t=0,I=2mA and with time it goes to 1mA

d.

I=2mA and at all t .

Question number: 3

» Current Electricity » Electrical Resistance

MCQ▾

Question

When current flows in a conductor, then the ratio of the intensity of electric field E at any point within the conductor and the current density at a point is called –

Choices

Choice (4) Response

a.

Inductance

b.

Specific resistance

c.

Resistance

d.

Conductance

Question number: 4

» Current Electricity » Temperature Dependence of Resistance

MCQ▾

Question

If a wire of resistance 20Ω is covered with ice and a voltage of 210V is applied across the wire then rate of melting of ice will be –

Choices

Choice (4) Response

a.

0.85gs

b.

6.56gs

c.

6.56gs

d.

All of the above

Question number: 5

» Current Electricity » Electrical Energy and Power

MCQ▾

Question

10Ω electric heater operates on a 110V line, then the rate at which it develops heat in watts will be –

Choices

Choice (4) Response

a.

670

b.

810

c.

1210

d.

1310

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