Moving Charges and Magnetism MCQ Questions Class 12 Physics Chapter 4
NCERT MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism. Moving Charges and Magnetism MCQ Questions with Answers from Class 12 Physics.
Moving Charges and Magnetism MCQ Questions Class 12 Physics Chapter 4
Moving Charges and Magnetism Multiple Choice Questions with Answers Class 12 Physics Chapter 4 PDF is available.
1) Oersted concluded that, _____ produces magnetic field in the surrounding space.
a) Moving Charges
b) Currents
c) Both a and b
d) None
Ans: c) both a and b
2) Radio waves were discovered by
a) J. C. Bose
b) Hertz
c) G. Marconi
d) None
Ans: b) Hertz
3) The magnetic field of several sources is the ____ of magnetic field of each individual source.
a) Vector addition
b) Vector sum
c) Algebraic sum
d) Both a and b
Ans: d) both a and b
4) Force on a negative charge is opposite to that on a
a) Positive charge
b) Negative charge
c) Neutral charge
d) None
Ans: a) positive charge
5) When velocity and magnetic field vectors are parallel or anti parallel then force due to magnetic field is
a) Constant
b) Unity
c) Zero
d) Infinity
Ans: c) zero
6) If the charges are not in motion then magnetic force is
a) Zero
b) Unity
c) Infinity
d) Constant
Ans: a) zero
7) The unit of magnetic field is
a) Ns/Cm
b) Tesla
c) Both a and b
d) Weber
Ans: c) both a and b
8) The smaller unit of magnetic field is
a) Weber
b) Tesla
c) Gauss
d) None
Ans: c) gauss
9) 1 gauss =
a) 10-4 Tesla
b) 10-6 Tesla
c) 10-5 Tesla
d) None
Ans: a) 10-4 Tesla
10) The earth’s magnetic field is about
a) 3.6*10-6T
b) 3.6*10-5 T
c) 3.6*10-7T
d) 3.6*10-9 T
Ans: b) 3.6*10-5 T
11) The electromagnetic force ____ on the medium between the two charges or magnets.
a) Does not depends
b) Depends
c) Both a and b
d) None
Ans: b) depends
12) If velocity and magnetic field vectors are perpendicular to each other then the path of motion of particle is
a) Elliptical
b) Parabolic
c) Circular
d) Linear
Ans: c) circular
13) If w is the angular frequency then v=
a) V = rw
b) V = w/r
c) V = r/w
d) None
Ans: a) V= rw
14) The angular frequency is independent on the
a) Frequency
b) Charge
c) Magnetic field
d) Velocity
Ans: d) velocity
15) The radius of the circular component of motion is called as
a) Radius of helix
b) Radius of circle
c) Radius of sphere
d) None
Ans: a) radius of helix
16) If the electric and magnetic fields are perpendicular to each other then it is called as
a) Parallel fields
b) Normal fields
c) Crossed fields
d) None
Ans: c) crossed fields
17) The cyclotron frequency is given by
a) qB/2m
b) qB/2
c) qB/2πm
d) None
Ans: c) qB/2πm
18) When the frequency of applied voltage and frequency of cyclotron become equal then
a) Vibrations takes place
b) Resonance takes place
c) Both a and b
d) None
Ans: b) resonance takes place
19) According to Boot Savart’s law, the magnitude of the magnetic field is
a) Directly proportional to current I
b) Directly proportional to length element dl
c) Inversely proportional to the square of the distance r
d) All
Ans: d) all
20) The pieces of equipment’s which generates magnetic field are
a) Solenoid
b) Toroid
c) Both a and b
d) None
Ans: c) both a and b
21) Which of the following uses combination of both solenoid and toroid to produce high magnetic fields
a) Cyclotron
b) Electromagnets
c) Synchrotron
d) Both b and c
Ans: c) Synchrotron
22) The long wire wound in the form of helix where the neighbouring turns are closely spaced is called as
a) Solenoid
b) Toroid
c) Cyclotron
d) Synchrotron
Ans: a) solenoid
23) The hollow circular ring on which a large number of turns of wire are closely wound is called as
a) Solenoid
b) Toroid
c) Cyclotron
d) Synchrotron
Ans: b) toroid
24) The magnetic field in the open space inside and exterior to the toroid is
a) Uniform
b) Zero
c) Infinity
d) None
Ans: b) zero
25) Parallel current
a) Attracts
b) Repels
c) Both a and b
d) None
Ans: a) attracts
- In case you have missed:- Previous Chapter MCQ Questions
26) Antiparallel current
a) Attracts
b) Repels
c) Both a and b
d) None
Ans: b) repels
27) A rectangular loop carrying current I and placed in a uniform magnetic field experiences a
a) Force
b) Torque
c) Both a and b
d) None
Ans: b) torque
28) The value of gyromagnetic ratio is
a) 8.8*10-10 C/kg
b) 8.8*1010 C/kg
c) 8.8*109 C/kg
d) 8.8*1012 C/kg
Ans: b) 8.8*1010 C/kg
29) The condition of discreteness is called as
a) Quantisation condition
b) Bohr quantisation condition
c) Both a and b
d) None
Ans: b) Bohr quantisation condition
30) The restoring torque per unit twist is called as
a) Rotational constant
b) Vibrational constant
c) Bohr magneton
d) Torsional constant of the spring
Ans: d) torsional constant of the spring
31) The deflection given by galvanometer per unit current is called as
a) Voltage sensitivity
b) Current sensitivity of galvanometer
c) Leakage current
d) None
Ans: b) current sensitivity of galvanometer
32) The deflection given by voltmeter per unit voltage is called as
a) Current sensitivity
b) Voltage sensitivity
c) Both a and b
d) None
Ans: b) voltage sensitivity
33) Magnetic moment m of the current loop is given by
a) Ir
b) Qr
c) IA
d) None
Ans: c) IA
34) The SI unit of magnetic moment for current loop is given by
a) Am
b) Cm
c) Am2
d) A/m2
Ans: c) Am2
35) The dimensions of magnetic moment for current loop is given by
a) [L2 A2]
b) [A L2]
c) [A L]
d) None
Ans: b) [A L2]
36) Galvanometer is the very sensitive device which gives full deflection for a current of the order of
a) Milliamperes
b) Amperes
c) Microamperes
d) None
Ans: c) microamperes
37) The galvanometer is always connected in _____ with the circuit.
a) Parallel
b) Series
c) Both a and b
d) None
Ans: b) series
38) The galvanometer has _____ resistance, this will change the value of the current in the circuit.
a) Large
b) Small
c) Moderate
d) None
Ans: a) large
39) To overcome the effect of galvanometer in the circuit, a small resistance is connected in parallel with the galvanometer which is called as
a) Internal resistance
b) External resistance
c) Shunt resistance
d) None
Ans: c) shunt resistance
40) The cyclotron frequency is independent of
a) Particles speed
b) Radius
c) Mass
d) Both a and b
Ans: d) both a and b
41) A moving galvanometer is converted into an ammeter by introducing the _______ of small value in _____.
a) Internal resistance, series
b) Shunt resistance, parallel
c) Shunt resistance, series
d) None
Ans: b) shunt resistance, parallel
42) The SI unit of permeability of free space is given by
a) TmA
b) Tm/A
c) Tm
d) A
Ans: b) Tm/A
43) The dimensions of permeability of free space is given by
a) [M L T-2 A-2]
b) [M-1 L T-2 A-2]
c) [M L-1 T2 A2]
d) None
Ans: a) [M L T-2 A-2]
44) The SI unit of magnetic field is given by
a) Weber
b) Am
c) Tesla
d) None
Ans: c) Tesla
45) The dimensions of magnetic field are
a) [M T-2 A]
b) [M T-2 A-1]
c) [M T-2 A-2]
d) None
Ans: b) [M T-2 A-1]
46) The SI unit of Torsion constant is given by
a) Nm rad
b) Nm/rad
c) N/mrad
d) None
Ans: b) Nm/rad
47) The dimensions of torsion constant is given by
a) [M L2 T-2]
b) [M L-2 T-2]
c) [M L T-2]
d) None
Ans: a) [M L2 T-2]
48) The permeability of free space is the
a) Vector quantity
b) Scalar quantity
c) Both b and d
d) Constant
Ans: c) both b and d
49) The magnetic field is the
a) Scalar quantity
b) Vector quantity
c) Tensor quantity
d) None
Ans: b) Vector quantity
50) Magnetic moment is the
a) Scalar quantity
b) Vector quantity
c) Tensor quantity
d) None
Ans: b) Vector quantity
51) Torsion constant is the
a) Scalar
b) Constant
c) Both a and b
d) Vector
Ans: c) both a and b
52) Magnetic field lines are always
a) Open loops
b) Closed loops
c) Both a and b
d) None
Ans: b) closed loops
- In case you have missed:- Next Chapter MCQ Questions