CBSE Class 12 Moving Charges and Magnetism Multiple Choice Questions with Answers. MCQ Questions Class 12 Moving Charges and Magnetism with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Moving Charges and Magnetism MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Moving Charges and Magnetism with Answers - Set - 2
Question 1:
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 the above
Correct Answer – (B)
Question 2 :
The current sensitibility of a moving coil galanometer increases with decrease in:
(a) magnetic field
(b) area of a coil
(c) number of turns
(d) None of these
Correct Answer – (D)
Question 3 :
A galvanometer may be converted into an ammeter or a volmeter in which of the following cases, the resistances of the device so obtained will be the largest?
(a) Ammeter of range 1 A
(b) Ammeter of range 10 A
(c) Voltmeter of range 1 V
(d) Voltmeter of range 10 V
Correct Answer – (D)
Question 4 :
The resistivity of a galvanometer is 60 division/amp. When a shunt is used, its sensitivity becomes 10 divisions/amp. If galvanometer is of resistance 20Ω, the value of shunt used is:
(a) 4Ω
(b) 5Ω
(c) 20Ω
(d) (20/7)Ω
Correct Answer – (A)
Question 5 :
A circular of radius R carries a current I. The magnetic field at its centre is B. At what distance from the centre on the axis of the coil, the magnetic field will be B8?
(a) √2R
(b) √3R
(c) 2R
(d) 3R
Correct Answer – (B)
MCQ Questions Class 12 Moving Charges and Magnetism with Answers
Question 6 :
A current carring coil is placed in a uniform magnetic field. If the coil turns through an angle θ, then the torque is directly proportional to:
(a) sin θ
(b) cos θ
(c) cot θ
(d) tan θ
Correct Answer – (B)
Question 7 :
Which device will have the least resistance?
(a) Ammeter of range 1A
(b) Ammeter of range 10 A
(c) Voltmeter of range 1 V
(d) Voltmeter of range 10 V
Correct Answer – (B)
Question 8 :
(a) S/(S + G)
(b) G/(S + G)
(c) G2/(S + G)
(d) GS/(S + G)
Correct Answer – (c)
Question 9 :
(a) nR0
(b) (n + 1)R0
(c) (n – 1)R0
(d) R0/n
Correct Answer – (C)
Question 10 :
A proton and an a particle enter in a uhiform magnetic field with the same velocity. The period of rotation of the α-particle will be:
(a) four times that of the proton.
(b) three times that of the proton.
(c) two times that of the proton.
(d) same as that of the proton.
Correct Answer – (C)
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