Vidaara.orgClass 10 · Physics
CodeVID-P10-04-CH-01
Magnetic Effects of Electric Current — Full Chapter Test
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- This is a full-length test covering the whole chapter — every topic is included.
- All questions are compulsory.
- Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
- Draw neat labelled diagrams wherever asked. For full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions
6 × 1 = 6 marks
1.
Oersted's experiment linked electricity with:
- A.sound
- B.magnetism
- C.heat
- D.light
2.
Field lines of a straight wire are:
- A.radial
- B.concentric circles
- C.straight
- D.square
3.
Fleming's Left-Hand Rule gives the direction of:
- A.induced current
- B.force on a conductor
- C.the field
- D.resistance
4.
An electric motor converts:
- A.mechanical to electrical
- B.electrical to mechanical
- C.heat to light
- D.chemical to sound
5.
An AC generator uses:
- A.a split ring
- B.slip rings
- C.no rings
- D.a fuse
6.
A fuse is connected in the:
- A.neutral wire
- B.live wire
- C.earth wire
- D.any wire
Section B — Short Answer (2 marks)
4 × 2 = 8 marks
7.
State the right-hand thumb rule.
8.
When is the force on a current-carrying conductor zero?
9.
State Fleming's Right-Hand Rule.
10.
Why is the earth wire connected to the metal body of an appliance?
Section C — Short Answer (3 marks)
2 × 3 = 6 marks
11.
List three properties of magnetic field lines.
12.
Explain why the coil of an electric motor rotates continuously.
Section D — Long Answer (5 marks)
2 × 5 = 10 marks
13.
Describe the construction and working of an electric motor with a labelled diagram, explaining the role of the split-ring commutator.
14.
With a labelled diagram, explain the construction and working of an AC generator and state how a DC generator differs from it.
Answer Key
Section A — Multiple Choice Questions
- (B) magnetism
- (B) concentric circles
- (B) force on a conductor
- (B) electrical to mechanical
- (B) slip rings
- (B) live wire
Section B — Short Answer (2 marks)
- Thumb along current, curled fingers give the field direction.
- When the conductor is parallel to the magnetic field.
- Forefinger = field, thumb = motion, middle finger = induced current.
- It carries any leakage current safely to the ground, preventing shock.
Section C — Short Answer (3 marks)
- Run N to S outside, closer where field is strong, never cross.
- Opposite forces on the arms form a couple; commutator reverses current each half turn.
Section D — Long Answer (5 marks)
- Coil between poles; Fleming's left-hand rule gives opposite forces; commutator reverses current each half turn for continuous rotation.
- Rotating coil induces current; slip rings give AC; a split-ring commutator instead gives DC.
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