1. To use an electric bulb of low voltage on A.C mains of high voltage , then identify the device employed
2. When a current-carrying conductor is placed in a magnetic field, it experiences a force. This phenomenon is described by:
3. Which of the following devices uses the principle of electromagnetic induction?
4. The most important safety method used for protecting home appliances from short circuiting or overloading is 0/1 Earthing
5. To Convert an AC generator in to DC generator
6. M.K.S units for magnetic flux are
7. Match the following.
List - 1 List - 2
1. Generator (AC) a) Electro magnetic induction
2. Solenoid b) Two stop rings
3. Dynamo c) Two, half stop rings
4. Generator (DC) d) Soft iron core
8. Which are more dangerous AC or DC?
9. What happens when an electric current flows through a wire?
10. Which of following is also called Tesla?
11. What is the unit of electric current?
12. In hydro electric power station , which energy is transformed to electrical energy?
13. Assertion: Electric motor converts electrical energy into mechanical energy. Reason: KPM stands for rotations per minute.
14. In an electromagnet, increasing the number of coils in the wire will
15. The magnetic force on a current carrying wire placed in uniform magnetic field of the wire is oriented perpendicular to magnetic field is ___
16. Which converts electrical energy into mechanical energy ?
17. Which of the following does not affect on the coil of D.C motor?
18. The relation between flux(f), field induction(B), area of loop (A) and angle (q) is ______
19. The value of magnetic field induction which is uniform is "2T" . What is the flux passing through a surface of area 1.5m³ perpendicular to the field is
20. The force applied by a remote controller on a T.V is
