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MCQs Physics Chapter 14 – Class 12

MCQs Physics Chapter 14 – Class 12

MCQs Physics Chapter 14 Electromagnetism

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#1. The value of μo is _____.

4π/10^-7 Wb/A/m

All

4πx10^-7 Wb/A/m

4πx10^-7 WbAm

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

current

potential difference

field

force

#3. e/m of neutron is:

1/0

2/1

1/1

0/1

#4. e/m =

VBr

V/Br

2V/Br

r/VB

#5. μo is called _____.

permitivity

Ampere Constant

Planck’s Constant

permutation

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

v x B

I x B

L x B

v x L

#7. e/m of electron is:

0/1

1/0

1/1

2/1

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

0°

90°

180°

60°

#9. Mass of electron is:

9.1 × 10^-27 kg

1.6 × 10^-31 kg

1.6 × 10^-27 kg

9.1 × 10^-31 kg

#10. B.ΔL =

μ^2/I

μ^2I

μoI

μo/I

#11. Magnetic flux density through solenoid B =

N/μoI

μonI

I/μon

μon/I

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

None

right hand

Both hands

left hand

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

gravitational force

electric force

Pauli's force

All

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

Perpendicular

Parallel

All

Antiparallel

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

rheostat

thermistor

filament

potentiometer

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

∓e(v x B)

-e(v x B)

±e(vxB)

+e(v x B)

#17. Torque on current carrying coil is:

τ = NIABcosα

τ = N / IABcosα

τ = N / IABsinα

τ = NIABsinα

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

smoothness

brightness

erectness

dullness

#19. Lorentz force F =

Fm + Fc

Fc + Fe

Fe + Fb

Fb + Fc

#20. Fe =

q(v x B)

I(L x B)

q/E

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

60°

180°

0°

90°

#22. 1T =

Siemen

m^2/Wb

Wb/m^2

Wbm^2

#23. Magnetic force is _____ force.

refracting

None

defracting

deflecting

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

μoI/2πr

None

μo/I2πr

μoI2πr

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

grid

screen

time base generator

filament

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

circular

antiparallel

parallel

perpendicular

#27. magnetic behavior of current was discoved by:

All

Oster and Ampere

Oster and Faraday

Faraday and Ampere

#28. e/m of proton is:

1/0

2/1

1/1

0/1

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

Antiparallel

Parallel

Perpendicular

All

#30. In CRO, thermionic emission occurs at:

anode

deflection plates

screen

cathode

#31. Magnetic force provide _____ work.

none

zero

maximum

minimum

#32. Magnetic Flux is a _____ quantity.

Base

None

Vector

Scalar

#33. F =

N/IABcosα

I/LBsinα

NIABcosα

ILBsinα

#34. 1T =

1M/AN

1N/AM

1AM/N

1NAM

#35. 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)

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

variable fields

interaction of fileds

distraction of fields

All

#37. Electromagnetism deals with:

electric field and magnetic field

magnetic field

magnetic field and gravitational field

electric field

#38. Fb =

q(v x B)

q/E

I(L x B)

#39. Mass of proton is:

9.1 × 10^-31 kg

1.67 × 10^-27 kg

9.1 × 10^-27 kg

1.6 × 10^-31 kg

#40. _____ are used to accelerate electrons.

grids

anodes

cathodes

screen

Finish

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MCQs Physics Chapter 14 Electromagnetism

Results

#1. The value of μo is _____.

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

#3. e/m of neutron is:

#4. e/m =

#5. μo is called _____.

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

#7. e/m of electron is:

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

#9. Mass of electron is:

#10. B.ΔL =

#11. Magnetic flux density through solenoid B =

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

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

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

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

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

#17. Torque on current carrying coil is:

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

#19. Lorentz force F =

#20. Fe =

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

#22. 1T =

#23. Magnetic force is _____ force.

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

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

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

#27. magnetic behavior of current was discoved by:

#28. e/m of proton is:

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

#30. In CRO, thermionic emission occurs at:

#31. Magnetic force provide _____ work.

#32. Magnetic Flux is a _____ quantity.

#33. F =

#34. 1T =

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

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

#37. Electromagnetism deals with:

#38. Fb =

#39. Mass of proton is:

#40. _____ are used to accelerate electrons.

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