46.

47.

48.

49.

50.

51.

52.

53.

54.

55.

The unknown particle ‘x’ in the nuclear reaction: kX + p > k* +x

(A) 0 (2) Hyperons
(C) Photons (D) Nucleons
The stable nuclei for a mass number 27 will have an atomic number corresponding to::
(A) Sodium (B) Aluminium
(C) Magnesium (D)_ Silicon
Which statement is incorrect about quarks?
(^) A° consists of 3 quarks (B) Zz consists of 3 quarks
(C) 4 consists of 2 quarks (0) consists of 2 quarks

Filters used in XRD may eliminate
A Ka (8) Kis
(0 ‏وط‎ (D) All the above
The attenuation mechanism due to optical fibers is because of:
(A) dispersion and absorption and depends on cladding and not core material
(B) absorption and scattering and depends on cladding and core material
(C) dispersion and scattering and depends on core material alone
(D) absorption alone but depends on cladding and core material

n semiconductor laser, the emission of radiation is :

(A) _ Is perpendicular to the direction of the exciting electron
(B) Is parallel to the direction of the exciting electron

(C) Is longitudinal to the direction of the exciting electron
(0) Is antiparallel to the direction of the exciting electron

The holographic setup should be arranged so that the vibrations due to mechanical, acoustic
or thermal effects should not produce a path variations more than :

(A) 2 (3) 4/4

(0) 4/6 0) 4/8

The relative index change of a fibre is 0.0032 and the core refractive index is 2. Then its
numerical aperture is :

(A) 0.016 (B) 0.017

(C) 0.16 (D) 0.17

A fibre cable has an acceptance angle of 30° and a core index of refraction 1.6. The refractive
index of cladding is:

(A) 1.52 (B) 1.65

(© 1.71 (D) 1.75

A relative population of 2/e is represented as the ratio of population of 2 energy states at
temperature of 300K. The wavelength of the radiation emitted at that temperature is:

(A) 1.2x105m (8) 2.4x10-6m

(© 3.4x105m (0) 4.8x 106m

11 084/2023
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