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Punjab (PTB) · Chapter test · Free

10th Class Physics Chapter 8 TestELECTROMAGNETISM

30 marks · 40 minutes · 21 questions. Covers: CHAP 17: ELECTROMAGNETISM.

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10th Class Physics Chapter 8 Test

10th Class · Physics · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

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

  1. 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

  2. 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

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

    1. Mechanics

    2. Electromagnetism

    3. Thermodynamics

    4. Optics

  4. 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

  5. Which component is used in a D.C. motor to reverse the direction of the current?

    1. Carbon brushes

    2. Armature

    3. Split ring commutator

    4. Battery

  6. How can the speed of a D.C. motor be adjusted?

    1. By changing the size of the magnet

    2. By controlling the current flowing through it

    3. By using different types of wires

    4. By rotating it manually

  7. According to the right-hand grip rule for a straight wire, what does the thumb point toward?

    1. Direction of magnetic field

    2. Direction of current

    3. Direction of resistance

    4. North pole

  8. Why do the forces acting on sides PQ and RS of the rectangular coil form a couple?

    1. They act in the same direction

    2. They are equal in magnitude but opposite in direction

    3. One force is much stronger than the other

    4. They cancel each other completely

  9. A relay is an electrical device that uses ...... to control another circuit.

    1. Heat

    2. Chemical reactions

    3. Magnetism

    4. Sound waves

  10. When two parallel wires carry electric current in the same direction, they:

    1. Repel each other

    2. Attract each other

    3. Cancel each other's current

    4. Do not interact

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. What are three important properties of magnetic field lines?

  2. How does placing a wire at different angles to a magnetic field affect the magnetic force it experiences, and why is this important in designing motors?

  3. What is the source of the Earth's magnetic field according to the theory?

  4. State the right-hand grip rule for finding the magnetic field direction around a straight wire.

  5. Why does a current-carrying wire experience a force when placed in a permanent magnetic field?

  6. Explain why two parallel wires carrying current in the same direction attract each other.

  7. What is a split ring commutator and how is it constructed?

  8. Describe how the strength of the magnetic field changes with distance from a current-carrying conductor.

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Describe an experiment to show that when a straight current carrying conductor is placed in magnetic field, it experience a force. Also state rule by which this force can be determine.

  2. Discuss the theory behind the Earth's magnetic field and the role of the Earth's molten core in generating it.

  3. How current carrying coil rotate in a magnetic field?