Magnetic Effects of Electric Current Class 10 MCQs
Magnetic Effects of Electric Current – MCQs
Class: 10 | Subject: Science | Section: Physics
Topic: Magnetic Effects of Electric Current
Based on NCERT Syllabus | CBSE Board Examination Pattern
Topic: Magnetic Effects of Electric Current
Based on NCERT Syllabus | CBSE Board Examination Pattern
1. A compass needle gets deflected when placed near a current carrying conductor. This shows that electric current produces:
Answer: c) Magnetic effect
Explanation: When current flows through a conductor, it generates a magnetic field around it. The compass needle deflects due to this magnetic field, proving the magnetic effect of electric current.
Explanation: When current flows through a conductor, it generates a magnetic field around it. The compass needle deflects due to this magnetic field, proving the magnetic effect of electric current.
2. Who discovered the magnetic effect of electric current?
Answer: b) Oersted
Explanation: Hans Christian Oersted observed compass deflection near a current‑carrying wire in 1820, establishing the relationship between electricity and magnetism.
Explanation: Hans Christian Oersted observed compass deflection near a current‑carrying wire in 1820, establishing the relationship between electricity and magnetism.
3. The direction of magnetic field around a straight conductor is given by:
Answer: c) Right Hand Thumb Rule
Explanation: If the right thumb points in the direction of current, curled fingers show magnetic field direction around the conductor.
Explanation: If the right thumb points in the direction of current, curled fingers show magnetic field direction around the conductor.
4. Magnetic field lines emerge from:
Answer: b) North pole
Explanation: Outside a magnet, field lines go from North to South, forming closed loops.
Explanation: Outside a magnet, field lines go from North to South, forming closed loops.
5. The SI unit of magnetic field is:
Answer: a) Tesla
Explanation: Magnetic field strength is measured in Tesla (T) in SI units.
Explanation: Magnetic field strength is measured in Tesla (T) in SI units.
6. Increasing current in a conductor will:
Answer: b) Increase magnetic field
Explanation: Magnetic field strength is directly proportional to current.
Explanation: Magnetic field strength is directly proportional to current.
7. Magnetic field inside a long straight solenoid is:
Answer: c) Uniform
Explanation: Field lines inside a solenoid are parallel, indicating uniform magnetic field.
Explanation: Field lines inside a solenoid are parallel, indicating uniform magnetic field.
8. A device that converts electrical energy into mechanical energy:
Answer: b) Motor
Explanation: Electric motor works on force experienced by a current‑carrying conductor in a magnetic field.
Explanation: Electric motor works on force experienced by a current‑carrying conductor in a magnetic field.
9. Fleming’s Left Hand Rule is used for:
Answer: b) Motor force direction
Explanation: It gives direction of force on a current‑carrying conductor in magnetic field.
Explanation: It gives direction of force on a current‑carrying conductor in magnetic field.
10. Split ring in a motor acts as:
Answer: b) Commutator
Explanation: It reverses current direction to keep coil rotating in same direction.
Explanation: It reverses current direction to keep coil rotating in same direction.
11. Electromagnets are made using:
Answer: b) Soft iron
Explanation: Soft iron magnetizes and demagnetizes easily, ideal for electromagnets.
Explanation: Soft iron magnetizes and demagnetizes easily, ideal for electromagnets.
12. Magnetic field lines never:
Answer: a) Intersect
Explanation: Intersection would mean two directions at same point, which is impossible.
Explanation: Intersection would mean two directions at same point, which is impossible.
13. Strength of electromagnet depends on:
Answer: d) All of these
Explanation: More current, more turns, and soft iron core increase strength.
Explanation: More current, more turns, and soft iron core increase strength.
14. Device to detect small current:
Answer: c) Galvanometer
Explanation: It detects and measures small electric currents.
Explanation: It detects and measures small electric currents.
15. Electric fuse works on:
Answer: b) Heating effect
Explanation: Excess current melts fuse wire, breaking circuit.
Explanation: Excess current melts fuse wire, breaking circuit.
16. Field around straight conductor is:
Answer: b) Circular
Explanation: Concentric circles form around current‑carrying wire.
Explanation: Concentric circles form around current‑carrying wire.
17. AC stands for:
Answer: a) Alternating Current
Explanation: Current reverses direction periodically.
Explanation: Current reverses direction periodically.
18. DC flows in:
Answer: a) One direction
Explanation: Direct current flows steadily in single direction.
Explanation: Direct current flows steadily in single direction.
19. Commercial motors use:
Answer: a) Electromagnets
Explanation: They produce stronger adjustable magnetic fields.
Explanation: They produce stronger adjustable magnetic fields.
20. Generator converts:
Answer: b) Mechanical to Electrical
Explanation: Based on electromagnetic induction, generators produce electricity from motion.
Explanation: Based on electromagnetic induction, generators produce electricity from motion.