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Created on March 26, 2023 By

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PHY 201

1 / 36

1. In vacuum or free space, what observations are made?

A. ρ=0, J=0

B. ρ=0, J=Jo

C. ρ=ρo, J=Jo

D. ρ=ρo, J=0

2 / 36

2. The basic theorem/ principle used to obtain mass-energy relation is_____________

A. Work - Energy Theorem

B. Momentum Conservation Theorem

C. Maxwell Theorem

D. Heisenberg’s Uncertainty Principle

3 / 36

3. Einstein energy mass equivalence is application on all the following except

A. Radioactivity

B. Nuclear fission and fusion integration

C. Find binding energy in atomic Nucleus

D. Find the quality of the material

4 / 36

4. Which of the following is Einstein’s mass energy relation?

A. E^2–p^2c^2=m0^ 2c^4

B. E=mc^2

C. Ek=mv^2/c^2

D. Ek=(m–m0)c^2

5 / 36

5. What would be the mass of the body at rest,i fit explodes into two objects of mass 2
kg each moving with a speed 0.8c relative to the original body

A. 6.2Kg

B. 6.7Kg

C. 4Kg

D. 5.4Kg

6 / 36

6. In Lorentzian relativity, if two events are simultaneous for one observer, they will be

simultaneous for all other observers as well.

A. True

B. False

7 / 36

7. Differential form of Gauss’s law in magneto statics is_____________

A. div B=0

B. div B=-dB/dT

C. div B=ρ/εo

D. div B=μJ

8 / 36

8. The output per unit of the variable factor employed is called

A. Productivity of labour

B. Average product

C. Total product

D. Marginal product

E. Average cost

9 / 36

9. When a particle is moving with a velocity of v light c relative to S, its velocity as

observed by an observer in the frame S

’ is_____________

A. c

B. Zero

C. 0.5c

D. 0.75c

10 / 36

10. The divergence of which quantity will be zero

A. E

B. D

C. B

D. H

11 / 36

11. Lorentz transformations are based on the principle of consistency of the velocity of
light.

A. False

B. True

12 / 36

12. Which of the following is the expression for the continuity equation?

A. dρ/dt+div.J=0

B. ρ+J=0

C. dρ/dt+J=0

D. ρ+divJ=0

13 / 36

13. In an electromagnetic wave, the electric field of amplitude 6.2V/m oscillates with a
frequency of 2.4X10
10Hz. The Energy density of the wave is__________

A. 3.4X10^-10 J/m^ 3

B. 4.4X10^ -10 J/m^ 3

C. 1.4X10^ -10 J/m^ 3

D. 2.4X10 ^-10 J/m^3

14 / 36

14. Which of the following laws do not form a Maxwell equation?

A. Gauss’s Law

B. Faraday’s Law

C. Planck’s Law

D. Ampere’s Law

15 / 36

15. Two particles approach each other with a speed 0.8c with respect to the laboratory.

Their relative speed is___________

A. 0.912c

B. 0.975c

C. 0.85c

D. 0.95c

16 / 36

16. If the velocity of a charged particle in perpendicular electric and magnetic field is

7.27X10^6 m/s and the Electric field is 6X10^6 N/c,what should be the value of magnetic

field for velocity sector?

A. 0.45 T

B. 0.94 T

C. 0.78 T

D. 0.83 T

17 / 36

17. The velocity of a charged particle to keep moving in the same direction, in a region

where electric and magnetic fields are perpendicular to each other ,is_______________

A. E/B+qE/B

B. B/E+qB/E

C. E/B

D. B/E

18 / 36

18. For Pair Production phenomenon to occur the photon must have energy,greater than

or equal to____________

A. 0.51MeV

B. 1.02MeV

C. 0.85MeV

D. 0.32MeV

19 / 36

19. In which of the following form scan Maxwell’s equation not be represented?

A. Integral

B. Static

C. Harmonic

D. Differential

20 / 36

20. The Faraday’s law states about which type of EMF

A. TransformerE MF

B. Back EMF

C. Secondary EMF

D. Generator EMF

21 / 36

21. Lorentz transformation equations hold for

A. Non - relativistic velocities only

B. All velocities: relativistic & non-relativistic

C. Relativistic velocities only

D. Photons only

22 / 36

22. The entire theory of electromagnetic waves is contained in Maxwell’s equations.

A. False

B. True

C. Partly True

23 / 36

23. Magnetic field can be produced by___________

A. It is produced naturally

B. Conduction current

C. Both conduction and displacement current

D. Displacement current

24 / 36

24. Find the Flux enclosed of a material of Flux density 12 units in area of 80cm

A. 12/0.8

B. 9.6

C. 12/80

D. 80/12

25 / 36

25. Which of the following is the expression for Lorentz force

A. ma+qE

B. q(vXB)

C. qE+q(vXB)

D. qE

26 / 36

26. The charge build up in the capacitor is due to which quantity?

A. Conduction current

B. Direct current

C. Displacement current

D. Convection current

27 / 36

27. Find the charge density when the electric Flux density is given by 2xi+3yj+4zk

A. 0

B. 24

C. 10

D. 9

28 / 36

28. In metals which of the following equation will hold good?

A. Curl(J)=dD/dt

B. Curl(J)=dB/dt

C. Curl(H)=D

D. Curl(H)=J

29 / 36

29. Two particles approach each other with a velocity of 0.9c.What is their relative

velocity as observed by A

A. 0

B. 0.99c

C. 0.94c

D. 0.9c

30 / 36

30. The property of magnetic field to converge electrons is used in microscopes as

___________

A. Magnetic Lens

B. Magnetic Convergence

C. Magnetic plate

D. Magnetic field

31 / 36

31. A particle of mass ‘m0’ moves with speed 0.8c, where ‘c’ is the speed of light in

vacuum.The relativistic kinetic energy of the particle is nearly

A. 0.32m0c^2

B. 1.66m0c^2

C. 0.66m0c^2

D. m0c ^2

32 / 36

32. Find the electric Flux density of a material with charge density 16 units in unit volume

A. 16t

B. 16

C. 162

D. 1/16

33 / 36

33. A point charge of 10X10-6C is at the centre of a cubical Gaussian surface of sides
0.5m. What is the flux for the surface?

A. 2.45X10^5 Nm^2/C

B. 3.45X10^5 Nm^2/C

C. 1.12X10^5 Nm^2/C

D. 3.12X10^5 Nm^2/C

34 / 36

34. In the case v<<c, Lorentz transformation is the same as____________

A. Maxwell’s transformation

B. Einstein’s transformation

C. Planck’s transformation

D. Galilean transformation

35 / 36

35. Find the Maxwell law derived from Ampere law

A. Curl(H)=J

B. Div(H)=J

C. Div(I)=H

D. Curl(B)=D

36 / 36

36. Increase in all inputs by a certain percentage resulting in a relatively higher percentage increase in output is referred to as:

A. Decreasing returns to scale

B. Constant returns of scale

C. Increasing returns to scale

D. Diminishing Returns

E. Law of variable proportion

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PHY 201 CBT PRACTICE TEST

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