Class 12th Physics Chapter 4 Objective In English

Class 12th Physics Chapter 4 Objective In English | Moving Charges And Magnetism | Class 12 Physics Mcq In English | Physics class 12 chapter 4 Objective Questions | moving charges and magnetism objective questions | moving charges and magnetism pdf

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Class 12th Physics Chapter 4 Objective In English

1. Acurrent carrying coil is placed in a uniform magnetic field. If the coll turns through an angle O, then the torque is directly proportional to

(A) sin θ
(B) cos θ
(C) cot θ
(D) tan θ

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(B) cos θ

2. The sensitivity of a tangent galvanometer can be increased by increasing

(A) the radius of the coil
(B) the external magnetic field
(C) the number of turns of the coil
(D) all of the above

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(B) the external magnetic field

3. The permeability of a paramagnetic substance is

(A) very large
(B) small but more than unity
(C) less than unity
(D) negative

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(B) small but more than unity

4. Which of the following shows that the earth behaves as a magnet ?

(A) Repulsion between like poles
(B) Attraction between unlike poles
(C) Null points in the magnetic field of a bar magnet
(D) No existence of isolated magnetic poles

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5. Circular loop of radius 0.0157 m carries a current 2A. The magnetic field at the centre of the loop is

(A) 1.57 x 10^-3 Wb/m²
(B) 8.0 x 10^-5 Wb/m²
(C) 2.0 x 10^-3 Wb/m²
(D) 3.14 x 10^-1 Wb/m2

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(B) 8.0 x 10^-5 Wb/m²

6. What happens to the magnetic field at the centre of a circular current carrying coil if we double the radius of the coil keeping the current unchanged ?

(A) halved
(B) doubled
(C) quadrupled
(D) remains unchanged

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(A) halved

7. The strength of the magnetic field around an infinite current carrying conductor is

(A) same everywhere
(B) inversely proportional to the distance
(C) directly proportional to the distance
(D) None

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(B) inversely proportional to the distance

8. A current carrying power line carries current from west to east. Then the direction of the magnetic field 2 m above it is

(A) west to east
(B) south to north
(C) north to south
(D) none

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9. Which of the following is not a unit of magnetic induction

(A) gauss
(B) tesla
(C) oersted
(D) weber/metre²

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10. A wire of length 2 metre carries a current 1 ampere, is bent to form a circle. The magnetic moment of the coil is

(A) 2π
(B) π/2
(C) π/4
(D) 1/π

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(D) 1/π

11. To convert galvanometer into voltmeter one should connect :

(A) high resistance in series with galvanometer
(B) low resistance in series with galvanometer
(C) high resistance in parallel with galvanometer
(D) low resistance in parallel with galvanometer

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(A) high resistance in series with galvanometer

12. The most suitable metal for making permanent magnets is

(A) iron
(B) steel
(C) copper
(D) aluminium

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(B) steel

13. The SI unit of magnetic dipole moment is

(A) Ampere
(B) Ampere metre²
(C) Tesla
(D) NONE

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(B) Ampere metre²

14. Earth’s magnetism was discovered by

(A) Gauss
(B) Oersted
(C) Ampere
(D) Gilbert

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(D) Gilbert

15. The magnetic moment per unit volume is called

(A) magnetising field
(B) magnetic induction
(C) magnetisation
(D) magnetic permeability

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Class 12 Physics Mcq In English | Related Post

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Class 12th Physics Chapter 4 Objective In English | Moving Charges And Magnetism | Class 12 Physics Mcq In English

Pattern Based	Bihar Board, Patna
Class	12^thor Inter
Stream	Science
Category	Class 12 Physics Mcq
Chapter Name	Moving Charges And Magnetism
Subject	Physics Class 12th
Class 12^th English Summary	BSEB Class 12th English Summary
Class 10^th Science All Chapter Objective Question	Click Hare
Type Of Question	Objective Question \|\| 01 Marks
Script	Hindi And English Medium
Published On	Bihari Academy