MCQs Physics Chapter 14 – Class 12

Al-Huda Science Academy has designed Class 12 MCQs Physics Chapter 14 Electromagnetism for board, MdCat and ECAT preparation. These MCQs help students to prepare for their entry test papers.

Chapter 14 Electromagnetism includes topics:

• Electromagnetism
• Force on a current carrying coil in magnetic field
• Magnetic Flux and Magnetic Density
• Ampere’s law
• Determination of flux density
• Force on a moving charge in a magnetic field
• Lorentz Force
• Determination of e/m
• CRO – Cathode Ray Oscilloscope
• Torque on a current carrying coil

MCQs Physics Chapter 14 Electromagnetism

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Next

#1. Flux is minimum when surface is _____ to B.

Perpendicular

Perpendicular

Antiparallel

Antiparallel

All

All

Parallel

Parallel

Next

#2. e/m of proton is:

1/1

1/1

1/0

1/0

2/1

2/1

0/1

0/1

Next

#3. Lorentz force is the sum of magnetic force and _____.

Pauli's force

Pauli's force

All

All

electric force

electric force

gravitational force

gravitational force

Next

#4. B.ΔL =

μ^2/I

μ^2/I

μo/I

μo/I

μoI

μoI

μ^2I

μ^2I

Next

#5. Magnetic force is perpendicular to a plane containing _____.

I x B

I x B

v x L

v x L

v x B

v x B

L x B

L x B

Next

#6. Magnetic force provide _____ work.

none

none

maximum

maximum

zero

zero

minimum

minimum

Next

#7. The value of μo is _____.

All

All

4πx10^-7 WbAm

4πx10^-7 WbAm

4πx10^-7 Wb/A/m

4πx10^-7 Wb/A/m

4π/10^-7 Wb/A/m

4π/10^-7 Wb/A/m

Next

#8. Magnetic Flux is a _____ quantity.

Base

Base

None

None

Scalar

Scalar

Vector

Vector

Next

#9. F =

N/IABcosα

N/IABcosα

ILBsinα

ILBsinα

I/LBsinα

I/LBsinα

NIABcosα

NIABcosα

Next

#10. In CRO, thermionic emission occurs at:

screen

screen

deflection plates

deflection plates

anode

anode

cathode

cathode

Next

#11. Horizontally aligned plates in CRO are called _____.

grid

grid

time base generator

time base generator

screen

screen

filament

filament

Next

#12. Direction of force on a current carrying conductor in uniform magnetic field is along the palm of _____.

None

None

right hand

right hand

left hand

left hand

Both hands

Both hands

Next

#13. Flux is maximum when surface is _____ to B.

Perpendicular

Perpendicular

Parallel

Parallel

All

All

Antiparallel

Antiparallel

Next

#14. 1T =

1NAM

1NAM

1M/AN

1M/AN

1N/AM

1N/AM

1AM/N

1AM/N

Next

#15. μo is called _____.

Ampere Constant

Ampere Constant

Planck’s Constant

Planck’s Constant

permutation

permutation

permitivity

permitivity

Next

#16. Torque on current carrying coil is:

τ = N / IABcosα

τ = N / IABcosα

τ = NIABcosα

τ = NIABcosα

τ = N / IABsinα

τ = N / IABsinα

τ = NIABsinα

τ = NIABsinα

Next

#17. The _____ is provided to Y-plates from external source in CRO.

potential difference

potential difference

current

current

field

field

force

force

Next

#18. In electromagnetism, electric and magnetic field are _____ to each other.

circular

circular

perpendicular

perpendicular

antiparallel

antiparallel

parallel

parallel

Next

#19. Magnetic force is _____ force.

refracting

refracting

deflecting

deflecting

defracting

defracting

None

None

Next

#20. e/m =

2V/Br

2V/Br

V/Br

V/Br

r/VB

r/VB

VBr

VBr

Next

#21. Magnetic flux density through current carrying wire B =

μoI/2πr

μoI/2πr

None

None

μoI2πr

μoI2πr

μo/I2πr

μo/I2πr

Next

#22. e/m of electron is:

0/1

0/1

1/0

1/0

1/1

1/1

2/1

2/1

Next

#23. e/m of neutron is:

1/0

1/0

0/1

0/1

2/1

2/1

1/1

1/1

Next

#24. Electromagnetism deals with:

electric field and magnetic field

electric field and magnetic field

magnetic field and gravitational field

magnetic field and gravitational field

electric field

electric field

magnetic field

magnetic field

Next

#25. In CRO, _____ is used to heat the cathode.

thermistor

thermistor

potentiometer

potentiometer

filament

filament

rheostat

rheostat

Next

#26. Magnetic flux density through solenoid B =

I/μon

I/μon

μon/I

μon/I

N/μoI

N/μoI

μonI

μonI

Next

#27. Force is minimum when angle between v and B is ______.

180°

180°

60°

60°

0°

0°

90°

90°

Next

#28. Force on moving negative charge in magnetic field is:

±e(v x B)

±e(v x B)

∓e(v x B)

∓e(v x B)

-e(v x B)

-e(v x B)

+e(v x B)

+e(v x B)

Next

#29. _____ are used to accelerate electrons.

grids

grids

anodes

anodes

screen

screen

cathodes

cathodes

Next

#30. 1T =

Siemen

Siemen

m^2/Wb

m^2/Wb

Wbm^2

Wbm^2

Wb/m^2

Wb/m^2

Next

#31. In CRO, grid controls _____ of screen.

erectness

erectness

smoothness

smoothness

dullness

dullness

brightness

brightness

Next

#32. Mass of electron is:

1.6 × 10^-27 kg

1.6 × 10^-27 kg

9.1 × 10^-31 kg

9.1 × 10^-31 kg

1.6 × 10^-31 kg

1.6 × 10^-31 kg

9.1 × 10^-27 kg

9.1 × 10^-27 kg

Next

#33. magnetic behavior of current was discoved by:

Faraday and Ampere

Faraday and Ampere

Oster and Faraday

Oster and Faraday

Oster and Ampere

Oster and Ampere

All

All

Next

#34. Force on moving positive charge in magnetic field is:

±e(vxB)

±e(vxB)

-e(v x B)

-e(v x B)

+e(v x B)

+e(v x B)

∓e(v x B)

∓e(v x B)

Next

#35. Lorentz force F =

Fb + Fc

Fb + Fc

Fc + Fe

Fc + Fe

Fm + Fc

Fm + Fc

Fe + Fb

Fe + Fb

Next

#36. The force on a moving charge is due to:

variable fields

variable fields

interaction of fileds

interaction of fileds

All

All

distraction of fields

distraction of fields

Next

#37. Fe =

q(v x B)

q(v x B)

qE

qE

I(L x B)

I(L x B)

q/E

q/E

Next

#38. Fb =

q(v x B)

q(v x B)

q/E

q/E

qE

qE

I(L x B)

I(L x B)

Next

#39. Mass of proton is:

9.1 × 10^-27 kg

9.1 × 10^-27 kg

1.6 × 10^-31 kg

1.6 × 10^-31 kg

9.1 × 10^-31 kg

9.1 × 10^-31 kg

1.67 × 10^-27 kg

1.67 × 10^-27 kg

Next

#40. Force is maximum when angle between v and B is ______.

90°

90°

180°

180°

0°

0°

60°

60°

Finish