MCQs Physics Chapter 14 – Class 12

MCQs Physics Chapter 14 Electromagnetism

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#1. Torque on current carrying coil is:

τ = NIABsinα

τ = N / IABcosα

τ = NIABcosα

τ = N / IABsinα

#2. Magnetic force is _____ force.

deflecting

defracting

refracting

None

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

Both hands

None

left hand

right hand

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

Antiparallel

Perpendicular

All

Parallel

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

μoI2πr

None

μoI/2πr

μo/I2πr

#6. e/m of neutron is:

0/1

1/0

2/1

1/1

#7. Lorentz force F =

Fe + Fb

Fm + Fc

Fb + Fc

Fc + Fe

#8. Magnetic Flux is a _____ quantity.

Scalar

Vector

None

Base

#9. Magnetic force provide _____ work.

none

minimum

maximum

zero

#10. In CRO, thermionic emission occurs at:

anode

deflection plates

cathode

screen

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

All

Pauli's force

gravitational force

electric force

#12. 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)

#13. B.ΔL =

μoI

μ^2/I

μo/I

μ^2I

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

∓e(v x B)

-e(v x B)

+e(v x B)

±e(vxB)

#15. Fe =

q(v x B)

q/E

I(L x B)

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

filament

potentiometer

rheostat

thermistor

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

distraction of fields

interaction of fileds

All

variable fields

#18. Fb =

I(L x B)

q(v x B)

q/E

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

time base generator

grid

filament

screen

#20. F =

N/IABcosα

I/LBsinα

NIABcosα

ILBsinα

#21. Mass of proton is:

1.67 × 10^-27 kg

1.6 × 10^-31 kg

9.1 × 10^-31 kg

9.1 × 10^-27 kg

#22. 1T =

1AM/N

1M/AN

1N/AM

1NAM

#23. magnetic behavior of current was discoved by:

All

Oster and Ampere

Faraday and Ampere

Oster and Faraday

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

60°

0°

90°

180°

#25. e/m =

V/Br

VBr

2V/Br

r/VB

#26. Electromagnetism deals with:

electric field

magnetic field

magnetic field and gravitational field

electric field and magnetic field

#27. e/m of electron is:

1/1

0/1

1/0

2/1

#28. Magnetic flux density through solenoid B =

μon/I

N/μoI

μonI

I/μon

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

force

current

potential difference

field

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

brightness

erectness

smoothness

dullness

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

v x B

I x B

v x L

L x B

#32. The value of μo is _____.

4πx10^-7 Wb/A/m

4πx10^-7 WbAm

All

4π/10^-7 Wb/A/m

#33. Mass of electron is:

1.6 × 10^-31 kg

9.1 × 10^-31 kg

9.1 × 10^-27 kg

1.6 × 10^-27 kg

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

90°

60°

0°

180°

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

All

Parallel

Antiparallel

Perpendicular

#36. 1T =

m^2/Wb

Siemen

Wb/m^2

Wbm^2

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

parallel

antiparallel

circular

perpendicular

#38. _____ are used to accelerate electrons.

grids

screen

cathodes

anodes

#39. e/m of proton is:

1/1

1/0

0/1

2/1

#40. μo is called _____.

Planck’s Constant

Ampere Constant

permitivity

permutation

Finish

MCQs Physics Chapter 14 Electromagnetism

Results

#1. Torque on current carrying coil is:

#2. Magnetic force is _____ force.

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

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

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

#6. e/m of neutron is:

#7. Lorentz force F =

#8. Magnetic Flux is a _____ quantity.

#9. Magnetic force provide _____ work.

#10. In CRO, thermionic emission occurs at:

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

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

#13. B.ΔL =

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

#15. Fe =

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

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

#18. Fb =

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

#20. F =

#21. Mass of proton is:

#22. 1T =

#23. magnetic behavior of current was discoved by:

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

#25. e/m =

#26. Electromagnetism deals with:

#27. e/m of electron is:

#28. Magnetic flux density through solenoid B =

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

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

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

#32. The value of μo is _____.

#33. Mass of electron is:

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

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

#36. 1T =

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

#38. _____ are used to accelerate electrons.

#39. e/m of proton is:

#40. μo is called _____.

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