Question Bank
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If four cells each of 1.5V are connected in series, the total EMF is:
If the cost of electricity is Rs. 10 per unit, how much does it cost to run a 2kW heater for 5 hours?
Which property of a wire is used in making the heating element of an electric kettle?
Two resistors of 6 Ohms and 12 Ohms are in parallel. What is their effective resistance?
What happens to the magnetic field strength of a solenoid if the number of turns per unit length is increased?
Which of the following is used to convert an AC voltage into a different AC voltage level?
A wire of resistance 4 Ohms is stretched to double its length. What is its new resistance?
In a series circuit of three identical resistors, the total power dissipated is P. If they are reconnected in parallel to the same source, the total power will be:
A cell of EMF 2V and internal resistance 0.5 Ohm is connected to an external resistance of 9.5 Ohms. What is the terminal potential difference?
Two copper wires A and B have lengths in ratio 1:2 and radii in ratio 2:1. The ratio of their resistances is:
A transformer is 90% efficient. If it consumes 1000W and the output voltage is 100V, what is the output current?
The drift velocity of electrons in a copper wire is of the order of:
What is the equivalent resistance of the network shown in the figure?
A 220V, 100W bulb and a 220V, 40W bulb are connected in series to a 220V supply. Which bulb will glow brighter?
Two charges of 1C each are placed 1m apart in vacuum. The force between them is:
Which of the following is used to convert a galvanometer into an ammeter?
Which of the following is used to convert a galvanometer into a voltmeter?