41. |
Which type of rays are produced during the nuclear reactions ?
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Answer:
Option (a) |
42. |
Match List - I (Electromagnetic wave type) with List - II (Its association/application) and select the correct option from the choices given below the lists.
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Answer:
Option (b) |
43. |
During the propagation of electromagnetic waves in a medium :
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Answer:
Option (a) |
44. |
A Red LED emits light 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is :
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Answer:
Option (b) |
45. |
At room temperature, if the relative permittivity of water be 80 and the velocity of light in water is 2.25 × 108ms-1, then the relative permeability of water is _____
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Answer:
Option (c) |
46. |
Arrange the following electromagnetic radiations per quantum in the order of increasing energy :
A : Blue light B : Yellow light C : X - ray D : Radiowave
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Answer:
Option (a) |
47. |
Capacitance of capacitor is 2pF. Electric field inside capacitor is changing with the rate of 1012 Vs-1 . Then displacement current is ____ A
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Answer:
Option (a) |
48. |
The electromagnetic waves in the range of wavelengths from 3 mm to 100 cm are used for the purpose of satellite communication. The range of frequencies corresponding to this range of wavelengths is _____ . (c = 3 × 108 ms-1 )
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Answer:
Option (b) |
49. |
If vg, vx, and vm are the velocities of the γ - rays, X - rays and microwaves respectively in space, then _____ .
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Answer:
Option (d) |
50. |
If µr be relative permeability and K be the dielectric constant of a given medium, then the refractive index of the medium is n = _____ .
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Answer:
Option (a) |