MCQ Questions for Class 10 Science Chapter 13 Magnetic Effects of Electric Current with Answers

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Magnetic Effects of Electric Current Class 10 MCQs Questions with Answers

Question 1.
Magnetic field is produced by:
(a) electrostatic point charge
(b) only electric current
(c) only bar magnet
(d) bar magnet and electric current both
Answer:
(d) bar magnet and electric current both

Question 2.
Unit of intensity of magnetic field is:
(a) Tesla
(b) Ohm
(c) Ampere
(d) Volt-ampere
Answer:
(a) Tesla

Question 3.
Unit of magnetic field intensity is:
(a) newton/(ampere-metre²)
(b) newton/(ampere-metre)
(c) newton-ampere-metre
(d) newton²/(ampere-metre)
Answer:
(b) newton/(ampere-metre)

Question 4.
In following which is not unit of magnetic field:
(a) weber/m²
(b) tesla
(c) gauss
(d) newton/ampere²
Answer:
(d) newton/ampere²

Question 5.
An electron is moving in an uniform magnetic field perpendicularly with velocity v. The force exerts on electron will be:
(a) ev/B
(b) evB
(c) eB/v
(d) vB/e
Answer:
(b) evB

Question 6.
A current carrying conductor is placed in between the poles of the stable magnetic field. The direction of force acting on the conductor is given by the law:
(a) Maxwell’s Cark-screw rule
(b) Fleming’s Right hand rule
(c) Fleming’s left hand rule
(d) Ohm’s law.
Answer:
(c) Fleming’s left hand rule

Question 7.
Formula of magnetic field near a straight current-carrying wire of infinite length is:
(a)

(b)

(c)

(d)

Answer:
(b)

Question 8.
The magnitude of the force acting on a current carrying conductor kept perpendicular to a magnetic field is:
(a) \(\frac {B}{il}\)
(b) \(\frac {i}{Bl}\)
(c) Bil
(d) \(\frac {Bl}{i}\)
Answer:
(c) Bil

Question 9.
The direction of magnetic force acting on moving charged particle in magnetic field is determined by:
(a) Ohm’s law
(b) Right hand thumb rule
(c) Fleming’s left hand rule
(d) Maxwell’s right hand screw rule.
Answer:
(c) Fleming’s left hand rule

Question 10.
Intensity of magnetic field due to current carrying solenoid depends on:
(a) nature of material of core
(b) magnitude of electric current
(c) number of turns in coil
(d) all the above
Answer:
(d) all the above

Question 11.
Electric motor converts:
(a) chemical energy into electric energy
(b) electric energy into mechanical energy
(c) mechanical energy into electric energy
(d) electric energy into chemical energy.
Answer:
(b) electric energy into mechanical energy

Question 12.
Unit of magnetic flux is:
(a) Weber / metre²
(b) Weber
(c) Weber/metre
(d) Weber-metre²
Answer:
(b) Weber

Question 13.
1 Tesla is equal to:
(a) 1 Weber/m²
(b) 1 Gauss
(c) 10^-4 Weber/m²
(d) 10^-4 Gauss.
Answer:
(a) 1 Weber/m²

Question 14.
If Ø = magnetic flux, B = magnetic field intensity, A = area, then the correct relationship between them is:
(a) B = Ø/A
(b) Ø = B/A
(c) A = BØ
(d) B = ØA
Answer:
(a) B = Ø/A

Question 15.
Unit of magnetic flux is:
(a) weber
(b) weber/metre
(c) weber/metre²
(d) weber-metre
Answer:
(a) weber

Question 16.
Unit of magnetic flux is:
(a) newton-ampere-metre
(b) newton-metre/ampere
(c) newton/ampere-metre
(d) newton-ampere/metre
Answer:
(b) newton-metre/ampere

Question 17.
The magnitude of induced e.m.f. is:
(a) proportional to the rate of change of field lines
(b) proportional to earth’s magnetic field
(c) depend on material of coil
(d) inversely proportional to the rate of change of speed of magnet.
Answer:
(a) proportional to the rate of change of field lines

Question 18.
Lenz’s law is based on which conservation law:
(a) charge
(b) mass
(c) momentum
(d) energy
Answer:
(d) energy

Question 19.
The instrument which converts mechanical energy into electric energy, is:
(a) motor
(b) dynamo
(c) galvanometer
(d) transformer
Answer:
(b) dynamo

Question 20.
Dynamo converts:
(a) chemical energy into electric energy
(b) sound energy into magnetic energy
(c) mechanical energy into electric energy
(d) mechanical energy into light energy.
Answer:
(c) mechanical energy into electric energy

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