(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

Give two precautious that you would take while putting off an electric switch.

What is the function of the split rings in a d.c. motor?

Why is the electric power from the generating station transmitted at high voltage?

How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?

How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.

How does the heat produced by die passage of current in a metallic wire depend on the time of passage of current in the wire?

What do you understand by ‘earthing’? What are the advantages of earthing in a household electric circuit? Explain, how it is done?

State relative advantages and disadvantages of ring system of wiring over the tree system.

An electric heater is rated 220 V, 550 W. What does this statement mean?

An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?

An electric heater is rated 220 V, 550 W. Electrical energy is also measured in kWh. What do you understand by a kilo-watt-hour?

State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.

How does earthing prevent electrical shock?

You are required to connect a bulb, a fan and a socket outlet to the mains in one set A and an air-conditioner and a refrigerator to the mains in other set B. Will you recommend the wire of same thickness and same insulation in both? explain your answer.

At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.

How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.

Three 250 W heaters are connected in parallel to a 100 V supply, Calculate total current taken from the supply.

Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the resistance of each heater.

Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the energy supply in kWh to the three heaters in 5 hour.

An electric bulb is rated 240V-60W and is working at 100% efficiency.
(i) Calculate the resistance of bulb.
(ii) (a) Draw the circuit diagram.
(b) What is the rate of conversion of energy in each bulb?
(c) Total power used by the bulbs.