MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 The lower refractive index the fibre core has 1.48 1.40 1.54 1.42
2 The fibre core has constant refractive index such as 1.48 1.5 1.52 1.56
3 Due to dispersion effects, white light source is useful for Long distance Short distance Very long distances None of these
4 The light source used in multimode step index fibre is A monochromatic source Red light White light None of these
5 Multimode step index fibre has diameter as 40 μm 50 μm 60 μm None of these
6 A single step index fibre can carry more than 14 TV channels 14,000 phone calls 16 TV channels a and b
7 The light signals are sent from the source A ordinary source A monochromatic light source A moulticolour source None of these
8 Single mode step index fibre has feature/s like Very thin core 5 (μm) miameter Relatively large cladding All of these
9 How many types of the optical fibres are One Two Three Four
10 A new type of optical fibre in which central core has high refractive index and its density gradually decreases towards its periphery is called Step index fibre Multimode step index fibre Multimode graded index None of these
11 Such type of fibre in which center core is of high refractive index and the layer over the central core is low refractive index is called Step index fibre Multi mode step index fibres Multimode graded index fibre None of these
12 The optical fibre has a layer over the central layer is called cladding of refractive index High Low Very high None of these
13 Two layers optical fibre in which central layer is called core which has refractive index High Low Very low None of these
14 A mode of propagation of light through optical fibre in which the light within the fibre is Reflected Refracted Continuously refracted None of these
15 The total internal reflection takes place for glass-air boundary is then the angle is Equal to 41.8<sup>o</sup> Greater than 41.8<sup>o</sup> Less than 41.8<sup>o</sup> None of these
16 For glass-air boundary the critical angle θc is 30<sup>o</sup> 41.8<sup>o</sup> 42.0<sup>o</sup> 44.0<sup>o</sup>
17 Snell's Law is defined as n1 sin&nbsp;θ<sub>2</sub> = n<sub>2</sub> sin&nbsp;θ n sin&nbsp;θ<sub>1</sub> = n<sub>1</sub> sin&nbsp;θ<sub>2</sub> n<sub>1</sub> sin&nbsp;θ<sub>1</sub> = n<sub>2</sub> sin&nbsp;θ<sub>2</sub> None of these
18 If the angle of refraction is 90o, for which the angle of incidence is called Incident angle Critical angle Angle of emergence None of these
19 Propagation of light in an optical fibre requires Total internal reflection Continuous refraction Both None of these
20 Proportion of light in an optical fibre requires that the light-should be within the fibre Very little confined Largely confined Totally confined None of these
21 An optical fibre with its protective case may be typically 6.0 mm in diameter and yet it can replace bundle of copper of diameter 6.79 cm 6.95 cm 7.52 cm 7.62 cm
22 Characteristics of optic fibre is/are Much thineer Light weight Extremely wide bandwidth All of these
23 The practical use of services by optic fiber is Two way television World processing Image transmitting and receiving equipment All of these
24 With tremendous information carrying capacity is called Data entry Band width Word processing None of these
25 Fire optics has ability to transmit Thousand telephone conversation Several television programs Numerous data signals between stations All of these
26 Fiber optics also used to transmit light Around corners Into inaccessible place Formerly unobservable objects All of these
27 The advantage/advantages of fiber optics than radio wave carriers Much wider band width Capability Immunity All of these
28 In photo phone modulated beam of reflected sun light focused on a detector several hundred meters away with the divice Germanium Selinium Silicon None of these
29 Graham Bell photo phone used a modulated beam of Reflected sun light Refracted sun light Diffracted sun light None of these
30 Photo phone was invented by Edison Graham Bell Bardeen None of these
31 The resolution of microscope depends on objective's Focal length Material Diameter None of these
32 A wider objective and the use of blue light of short wavelength produces Interference Diffraction Less diffraction Polarization
33 An image formed by a concave lens is always Virtual Real Inverted None of these
34 A double convex lens acts as a diverging lens when the object is Between f and 2f At the foucs Inside the focus All of these
35 The minimum distance between an object and its image in a convex lens is 2 f 2.5 f 3 f 3.5 f
36 The speed of light in other material is always Greater than c Less than c Equal to c None of these
37 The time taken by light for its passage from M to m and back is 2c/d d/2c 2d/c d<sup>2</sup>/2c
38 The time taken by the mirror M to rotate through an angle 2π/8 is 1/8 f 1/16 f 1/4 f 1/2 f
39 Angle subtended by any side of the eight-sided mirror at the center is π/8 π/4 2π/8 2π/4
40 At certain speed, the time taken by light in moving from M to m and back to M is equal to the time taken by Face 4 &nbsp;to 1 Fact 6 to 1 Face 3 to 1 Face 2 to 1
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