NDA PHYSICS QUIZ - 12

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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:

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 3:

A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 ms-1 to 3.5 ms-1 in 25 s. The direction of the motion of the body remains unchanged. What is the magnitude of the force?

Question 4:

100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor ?

Question 5:

How much work is done in moving a charge of 2 C across two points having a potential difference of 12 V ?

Question 6:

Ampere is the S.I unit of which of the following physical quantity ?

Question 7:

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 8:

What is the maximum number of 60 W bulbs that can be run from the mains supply of 220 volts if you do not want to overload a 5 A fuse ?

Question 9:

What is the colour of the neutral wire in household circuits?

Question 10:

A domestic lighting circuit has a fuse of 5 A. If the mains supply is at 230 V, calculate the maximum number of 36 W tube-lights that can be safely used in this circuit.