10th Class Physics 3rd Quarter Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

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. The current was considered to be due to flow of only positive charges, named as:

   1. Conventonal current

   2. Diretc current

   3. Indirect current

   4. Alternating current

3. Which statement is correct:

   1. Magnetic field lines always from closd loops

   2. Magnetic field lines always from ditanced loops

   3. Magnetic field lines never come from a bar magnet

   4. All are correct

4. If we stop moving magnet near a coil:

   1. Current will increase

   2. Current will decrease

   3. Current becomes zero

   4. Remain contant

5. A typical main circuit consist of wires:

   1. Two

   2. Three

   3. Four

   4. Five

6. Which rule is used to determine the direction of the force acting on a current-carrying conductor in a magnetic field?

   1. Right-hand grip rule

   2. Fleming's left-hand rule

   3. Ohm's law

   4. Joule's law

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

   1. Chemical

   2. Electrical

   3. Thermal

   4. Nuclear

8. What does electricity power to charge phones, laptops, and electric vehicles?

   1. Electronics

   2. Chargers

   3. Motors

   4. Bulbs

9. Which branch of physics deals with the interactions between electric and magnetic fields?

   1. Mechanics

   2. Electromagnetism

   3. Thermodynamics

   4. Optics

10. 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

11. Which are the hazards of electricity?

    1. Malpractice

    2. Damage insulation

    3. Over heating

    4. All of these

12. Which statment is true about magnetic field?

    1. Unlike poles

    2. LIke poles attract

    3. Magnetic poles do not affect each other

    4. A single magnetic pole does not exist