Question

Model Question
Std 10 Physics
GV&HSS Pakalkkuri
Total marks - 40
Time - 90 minutes
(one extra question is given in each section)


1 mark questions
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1. Fill in the blanks.
Filament Lamp : Tungsten
Iron Box : _______________
2. Fleming's Right hand rule : Direction of magnetic field
Fleming's left hand rule :__________
3. A device that generate heat without heating coil is ........
4. If voltage reduced to half without any change in resistance, what will happen to the power ?
5. From the following which device needs to be connected in parallel with the circuit?
a) Voltmeter
b) ammeter
c) Galvanometer

2 marks questions.
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6. Three-pin plug only works perfectly if earthing is done without any fault. Justify this statement.

7. Thick insulated wire is used in the primary of the step up transformer and the secondary of the step down transformer. What is the need for this?

8. What is the structural difference between an AC genarator and a DC genarator?

9. The ratio between the voltage and current in the coils of a transformer is (a).............. and the ratio between the number of coils and the voltage is (b).................

10. If a bulb of ratings 230V ,110W working in 230V then what will be its power ? What is meant by the power?

3 marks questions
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11. When a filament lamp of ratings 230V and 115W is working for 5 minutes,
a) what is the total amount of current flows through the bulb?
b)What is the total electric charge flows through it?

12. State the motor principle. What is the motion of a conductor if the direction of current in the conductor and the direction of the magnetic field are the same?

13. Explain the relation between the number of turns of coils in primary and secondary, voltage and current in the transformer with the help of an equation.

14. Explain the differences between a DC motor and a DC generator.

15. Draw the diagram of a DC motor and label it.

4 marks questions
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16. In a house 6 bulbs of 60W each are working for a total of 4 hours. If the rate for 1kWh is 5Rs, then what will be the total amount expected for 1 month? If we use 18W CFL bulbs instead of 60W bulbs how much Rupees can we save?

17. a)Why can't we decrease the power loss by reducing the resistance of transmission lines?
b) Explain the effective method adopted to reduce transmission loss.

18. a) Explain Joule's law.
b) If a nichrome wire and a copper wire connected in parallel, which wire gets more heat? Give reson.
c) when these wires connected in series what will be the change of temperature in both wires? Explain the reason.

19. What are the principles behind the working of a moving coil loudspeaker and a moving coil microphone? What are the energy change in both devices ?

20. Compare the advantages and disadvantages of discharge lamp and LED lamp​

Answer 1

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