Q.1. Which of the following is of electromagnetic wave character
(A) B – rays
(B) a – rays
(C) y – rays
(D) none of these
Ans :- (C)
Q.2. Which one of the following has maximum penetrating power
(A) X – rays
(B) cathode rays
(C) a – rays
(D) y – rays
Ans :- (D)
Q.3. the phase difference between electric and magnetic fields in an electromagnetic wave is
(A) 0
(B) r/2
(C) r
(D) 1
Ans :- (B)
Q.4. The direction of propagation of electromagnetic wave is
(A) parallel to B
(B) parallel to e
(C) parallel to B × e
(D) parallel to e × B
Ans :- (D)
Q.5. The value of maximum amplitude produced due to interference of Two Waves is given by
y₁ = 4 sin wt and y₂ = 3 cos ωwt
(A) 7
(B) 5
(C) 1
(D) 25
Ans :- (A)
Q.6. The phase difference Φ is related to Path difference Δx by
(A) λ/π Φ
(B) π/λ Φ
(C) λ/2π Φ
(D) 2π/λ Φ
Ans :- (C)
Q.7. The electromagnetic wave with frequencies greater than TV signals and less than infrared waves, are called
(A) microwaves
(B) x – rays
(C) y – rays
(D) none of these
Ans :- (A)
Q.8. Which of the following help us for recognition of precious stone ?
(A) Ultraviolet rays
(B) Infrared
(C) X – rays
(D) none
Ans :- (C)
Q.9. Electromagnetic waves are produced by
(A) an accelerated charge
(B) a charge at rest
(C) uncharged particles
(D) uniformly moving charge
Ans :- (A)
Q.10. Accelerated charges produce
(A) α – rays
(B) γ – rays
(C) β – rays
(D) electromagnetic wave
Ans :- (D)
Q.11. Electromagnetic wave in free space is
(A) longitudinal
(B) transverse
(C) progressive
(D) none of these
Ans :- (B)
Q.12. Which of the following component of the electromagnetic spectrum is used in operating radar ?
(A) microwave
(B) radiowave
(C) X – rays
(D) γ – rays
Ans :- (A)
Q.13. What is the cause of conduction current?
(A) changing the magnetic flux
(B) changing the electric flux
(C) flow of the charge under the action of potential difference
(D) none of these
Ans :- (C)
Q.14. Which of the following is not electromagnetic wave ?
(A) sound wave
(B) X – rays
(C) thermal radiation
(D) microwave
Ans :- (A)
Q.15. In alternating circuit, the displacement current can be increased by increasing
(A) frequency of alternating current
(B) the time
(C) both ‘A’ and ‘B’
(D) none of these
Ans :- (A)
Q.16. Which of the following is not electromagnetic waves in nature ?
(A) X – rays
(B) γ – rays
(C) infrared rays
(D) cathode rays
Ans :- (D)
Q.17. Name the electromagnetic radiation used for viewing objets through haze and fog .
(A) infrared radiation
(B) Microwave
(C) X – rays
(D) none of these
Ans :- (A)
Q.18. The wavelength of X – rays (or e.m. waves) is the order of
(A) angstron
(B) micron
(C) millimeter
(D) meter
Ans :- (A)
Q.19. 1 roentgen is the unit of
(A) X – ray energy
(B) X – ray wavelength
(C) X – ray amount
(D) none of these
Ans :- (C)
Q.20. The discovery of X – ray was made by
(A) lave
(B) comption
(C) roentgen
(D) Coolidge
Ans :- (C)
Q.21. Name the electromagnetic wave can cause damage to tissues of the cells of human body
(A) microwaves
(B) radiowave
(C) X – rays
(D) cathode rays
Ans :- (C)
Q.22. Name the electromagnetic Waves which are stopped by bones
(A) X – rays
(B) infrared rays
(C) cathode rays
(D) none of these
Ans :- (A)
Q.23. X – rays are produced by
(A) discharge tube
(B) cathode ray tube
(C) Coolidge tube
(D) none of these
Ans :- (C)
Q.24. X – rays are similar to
(A) α-rays
(B) β-rays
(C) γ-rays
(D) cathode rays
Ans :- (C)
Q.25. Electromagnetic waves are produce by
(A) a static change
(B) a moving charge
(C) an accelerated charge
(D) chargless particle
Ans :- (C)
Q.26. Indentify which of the following electromagnetic spectrum having minimum frequency
(A) γ-rays
(B) radiowave
(C) microwave
(D) X-rays
Ans :- (B)
Q.27. Name the part of electromagnetic spectrum is used to produce in nuclear reactions
(A) microwaves
(B) radiowaves
(C) γ-rays
(D) X-rays
Ans :- (C)
Q.28. The electromagnetic waves do not transport
(A) energy
(B) momentum
(C) charge
(D) information
Ans :- (C)
Q.29. Electromagnetic waves are transverse in nature is evident by
(A) polarisation
(B) interference
(C) reflection
(D) diffraction
Ans :- (A)
Q.30. Infrared radiation are defected by
(A) spectrometre
(B) Pyrometre
(C) nano metre
(D) photometre
Ans :- (B)
Q.31. earth’s atmosphere is richest in
(A) uttra violet rays
(B) infrared
(C) X- rays
(D) microwave
Ans :- (B)
Q.32. According to Maxwell’s shypothesis, a changing electric field gives rise to
(A) an emf
(B) ELectric current
(C) Pressure gradient
(D) magnetic field
Ans :- (D)
Q.33. In general, the wavelength of microwave is
(A) More than that of radiowaves
(B) Less than that of UV waves
(C) More than that of IR waves
(D) Less than that IR waves
Ans:- (C)
Q.34. Which of the following will defiect in electric field
(A) X- ray
(B) Y- rays
(C) Cathode rays
(D) UV rays
Ans :- (C)
Q.35. Which wavelength of the sun is used finally is electric energy
(A) Readio wave
(B) Infrared wave
(C) Visible light
(D) Microwave
Ans :- (B)
Q.36. When a high ultraviolet photon enters in an electric field it will be
(A) accelerated
(B) retarded
(C) undefiected
(D) none of these
Ans :- (C)
Q.37. What is the cause of green house effect
(A) infrared rays
(B) Ultraviolet rays
(C) X- rays
(D) radiowaves
Ans :- (A)
Q.38. Infrared radiation was discovered by
(A) willian wollastan
(B) Willian hershel
(C) Williem Roentgen
(D) Thomas Young
Ans :- (B)
Q.39. Which of the following is a natural source of y- rays
(A) Radio – cobalt
(B) radio – phosphorus
(C) radon gas
(D) radio carbon
Ans :- (C)
Q.40. Force required to stop a photon is
(A) ΔP/U
(B) ΔU/P
(C) ΔU/C
(D)ΔP/C
Ans :- (D)