10th Class Physics Chapter 9 TestELECTROMAGNETIC INDUCTION AND ELECTROMAGNETIC WAVES

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. In a transformer, energy is transferred from the primary coil to the secondary coil through:

   1. Direct electrical connection

   2. A magnetic field in the iron core

   3. Electron flowing through the core

   4. Heat conduction

2. If we stop moving magnet near a coil:

   1. Current will increase

   2. Current will decrease

   3. Current becomes zero

   4. Remain contant

3. An A.C. generator is a device that converts mechanical energy into ...... energy.

   1. Chemical

   2. Electrical

   3. Thermal

   4. Nuclear

4. What is the primary purpose of a Cathode Ray Oscilloscope (CRO)?

   1. To store chemical energy

   2. To measure and display how electrical signals change with time

   3. To generate high frequencies of sound

   4. To increase the voltage of A.C. circuits

5. Which rays moves faster:

   1. Gamma rays

   2. Radio rays

   3. Both at same speed

   4. None of these

6. Electricity created without battery this phenomenon is known as:

   1. Electrical induction

   2. Electromagnetic induction

   3. Both a and b

   4. None of these

7. The ejection of electrons from a metal surface when light shines on it is known as the ...... .

   1. Thermionic emission

   2. Magnetic effect

   3. Photoelectric effect

   4. Greenhouse effect

8. The process by which a changing magnetic field produces an electric current in a conductor is called ...... .

   1. Electromagnetic radiation

   2. Electromagnetic induction

   3. Magnetic resonance

   4. Thermionic emission

9. What type of waveform is applied to the X-plates to move the spot horizontally in a regular time-based manner?

   1. Sine wave

   2. Square wave

   3. Saw-tooth waveform

   4. Circular wave

10. To find direction of electron used:

    1. Micheal Faraday's rule

    2. Joseph Henry rule

    3. Fleming's left hand rule

    4. None