CBSE Class 10 Science Sample Paper 2012 Set K

Chapter: Electricity

1. What is represented by joule/coulomb.

2. What is the shape of V-I graph for ohmic resistance.

3. Define electrical resistivity and give its SI unit.

4. How will you join three resistances, each of 2 ohms so that the effective resistance is 3 ohms.

5. State Ohm’s Law. How can it be graphically represented?

6. An electric lamp draws a current of 0.5 A for 1 hour. Calculate the amount of charge that flows through the lamp.

7. Why is lead-tin alloy used for making fuse?

8. Write briefly two applications of heating effect of current.

9. Derive an expression for the equivalent resistance of three resistors connected in series.

10. In household circuits, why appliances are connected in parallel to one another?

11. What is the power of a bulb rated at 2.5 V and 500 mA?

12. Draw a schematic diagram of an electric circuit consisting of a battery of two cells each of

1.5 V, 5 ohms, 10 ohms resistors and a key, all connected in series.

13. Calculate the electric energy consumed by 1200 W toaster in 20 minutes.

14. What is commercial unit of electric energy? Obtain its value in SI unit of energy.

15. In the circuit where three resistors of resistance 2 ohms, 5 ohms and 10 ohms are connected in parallel to a battery of 6 V. Find

(a) the total current in the circuit

(b) the current through each resistor. 

Chapter: Magnetic Effects of Current

1. Name the device which converts mechanical energy into electrical energy.

2. What are the colours of live, neutral and earth wire?

3. State two ways by which the strength of electromagnet can be increased.

4. What is solenoid. Draw field lines around a current carrying solenoid.

5. Name and state the rule to find the direction of force on a current carrying conductor placed perpendicular to magnetic field.

6. What is electromagnetic induction? Give two ways to induce current in a coil.

7. How do we connect fuse in the domestic circuit?

8. What is earthing? How does it work as a safety measure?

9. What is an electromagnet? State two differences between electromagnet and permanent magnet.

10. Discuss the main features of domestic wiring with the help of a diagram.

11. What type of current is used in household supply? What is its advantage?

12. What is short circuit and overloading? How can overloading be avoided?

13. How is uniform magnetic field represented?

14. Name and state the rule to find the direction of induced current in the coil.

15. Write the characteristics of magnetic field lines. Draw magnetic field lines around a bar magnet.

Chapter: Sources of Energy

1. What are conventional sources of energy? Give two examples.

2. What is the major component of Biogas and Natural gas?

3. Why is biogas considered to be an ideal fuel? Give three reasons.

4. State two advantages and two limitations of solar energy.

5. What is hydel power. Draw a schematic diagram of a hydroelectric power plant.

6. Explain three ways in which energy can be harnessed from oceans.

7. Give one limitation of extracting energy from water, wind and oceans.

8. What is the minimum wind velocity required to obtain useful energy with a windmill?

9. Why is coke considered better fuel than coal?

10. Why sun is called the ultimate source of energy?

11. What are the merits of using solar cells to produce electricity.

12. Name two sources of energy that do not come directly or indirectly from the solar energy.

13. List some hazards of nuclear power generation and the safety measures that that should be taken.

14. Why are we looking at alternate sources of energy?

15. Name two renewable sources of energy.

Please refer to attached file for CBSE Class 10 Science Sample Paper 2012 Set K