Electricity And Magnetism - Study Mode

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[#241] Which of the following metals is used for the manufacture of heating elements provided in electric iron?

(A) Nickel

(B) Chromium

(C) Nichrome

(D) Tungsten

Correct Answer

(C) Nichrome

[#242] To maintain the current in a given electrical circuit, the cell has to spend . . . . . . . . energy stored in it.

(A) Electric

(B) Kinetic

(C) Chemical

(D) Potential

Correct Answer

(C) Chemical

[#243] A current of 0.5 A flows through the resistor in the circuit and have a voltage source with 6 V. The power supplied to the resistance by the source will be . . . . . . . .

(A) 1.0 W

(B) 1.5 W

(C) 0.5 W

(D) 3.0 W

Correct Answer

(D) 3.0 W

[#244] Consider the following statements. An ordinary light bulb has a rather short life because the 1. Filament wire is not uniform. 2. Bulb cannot be evacuated completely. 3. Wires supporting the filament melt at high temperatures. Which of the above statements are correct?

(A) Only 1 and 3

(B) Only 2 and 3

(C) Only 1 and 2

(D) 1, 2 and 3

Correct Answer

(D) 1, 2 and 3

[#245] The potential difference is 40V. Find the work done in moving a charge of 0.5 C?

(A) 20 J

(B) 20 Ω

(C) 20 A

(D) 20 Ω-m

Correct Answer

(A) 20 J