NDA PHYSICS QUIZ - 15

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Question 1:

An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.

Question 2:

A device that is used to break a electric circuit is called –

Question 3:

When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88 x 10J of heat are produced. Calculate the power of the resistor.

Question 4:

Which of the following is not based on heating effect of electric current?

Question 5:

In the circuit diagram given below five resistances of 10 Ω, 40 Ω, 30 Ω, 20 Ω and 60 Ω are connected as shown to a 12 V battery. Calculate the total resistance in the circuit.

Question 6:

An electric circuit is consisting of a cell, an ammeter and a nichrome wire of length l. If the length of the wire is reduced to half (l/2), then the ammeter reading-

Question 7:

Which of the following is the value of the resistance of a copper wire of 1.0 km length and 0.50 mm diameter if the resistivity of copper is 1.7 × 10-8 Ωm.

Question 8:

Which of the following converts electrical energy to mechanical energy?

Question 9:

Fuse operates on which effect of electric current?

Question 10:

If the potential difference between the end of a wire of fixed resistance is doubled, by how much does the electric power increase?