MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 Crystal lattice is a repetition of Atoms Molecules Unit cell  All of them
2 Unit cell has a basic structure of One dimensional Two dimensional Three dimensional  None of these
3 The polymeric solids have specific gravity compared with even the lightest of metals Low Very Low Slightly low None of these
4 Polymeric solids have the structure One dimensional Two dimensional Zero dimension Three dimensional
5 Polymeric solids have the properties like No definite shape No definite structure Partially crystalline solids All of them
6 The amorphous material (solids) have No structure No melting point No definite shape All of them
7 On heating, it becomes a very viscous liquid at almost 500 C<sup>o</sup> 800 C<sup>o</sup> 900 C<sup>o</sup> 1000 C<sup>o</sup>
8 Amorphous materials have the properties of solids like No structure Like liquid Glassy a and c
9 Every crystalline solid has a melting point Definite Not definite Any Change every time
10 At higher temperature their vibrations become so great that structure suddenly breaks up and changes into Order to disorder Solid into liquid Melted All of them
11 Inspite vibrations the force which hold the atoms in their ordered form is Vander vall force Cohesive force Adhesive force None of these
12 While vibrating the atoms are at their Fixed positions Extreme position Average positions None of these
13 With the rise of temperature the amplitude of atoms Slow down Fixed Increases None of these
14 The atoms molecules or ions in a crystalline solids are at room temperature Motionless Vibrate violently Fixed Simply vibrate
15 The metals become a magnetic material because of their Hardness Alignment of atoms Structure All of them
16 The metals become electrically conducting due to their Ductility Hardness Structure All of them
17 Crystalline solids are also Metals Ionic compound Ceramics All of them
18 Crystalline solids have the properties such as Regular arrangement Covalent bonding Some what defective All of them
19 The re conversion of light signals into electrical signals takes place due to Transmitter Receiver Generator None of these
20 The conversion of electrical signals into light signals taken place due to Generator Transmitter Receiver None of these
21 In digital modulation, the LED or laser flashed on and off at a Fast rate Very fast rate Extremely fast rate None of these
22 Using a graded index fibres the time difference is reduced to about 0.5 ns per km 1.0 ns per km 2.0 ns per km 2.3 ns per km
23 Inspite of different dispersion, all the wavelengths arrive at the other end of the fibre at the same time. With a step-index fibre overall time difference may be about 40 ns 30 ns 32 ns 33 ns
24 The power loss can also take place due to Information received can be inaccurate due to dispersion Light signal may not be perfectly monochromatic Signal accuracy may be affected by deflective source All of these
25 Power loss taken place when a light signal travels along fibres by Multiple reflection Light absorbed due to impurities in glass At joint some light is scattered by group of atoms All of these
26 Which device converts the light signals which these amplified and decoded Photo cell Photo diode Photo transistor None of these
27 In a never system, the repeaters are placed at about 50 km 75 km 100 km 125 km
28 Repeaters are the devices which regenerate the signals and are placed at about 20 km 30 km 40 km 50 km
29 The ultra-purity of optical fibre is 90 %&nbsp; 99 % 99.9 % 99.99 %
30 The digital modulation is expressed in Bytes Codes Bits None of these
31 The transmission of information by light waves may be An audio signal A television signal A computer data signals All of them
32 Which one light source can travel faster through optical fibre is Infra red Visible Ultra violet All of these
33 The typical wavelength of light source in transmitter is 1.1&nbsp;μm 1.2&nbsp;μm 1.3&nbsp;μm 1.4&nbsp;μm
34 The light source in the transmitter can be either Light emitting diode Semiconductor laser Light emitting in an invisible infra red All of these
35 The components of a fibre optic communication system is/are At transmitter An optical fibre Receiver All of these
36 How many major components of fibre optic communication system are 4 5 3 2
37 When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is 11.2<sup>o</sup> 14.2<sup>o</sup> 15.4<sup>o</sup> 13.6<sup>o</sup>
38 Calculate the critical angle when core refractive index is 1.50 and cladding of refractive index 1.48 70.3<sup>o</sup> 80.9<sup>o</sup> 80.6<sup>o</sup> 89.6<sup>o</sup>
39 In multimode graded index fibre core and cladding has boundary Noticeable&nbsp; No noticeable No boundary None of these
40 The range of the diameter of core in multimode graded index fibre is 50 to 100&nbsp;μm 50 to 1000&nbsp;μm 50 to 1000&nbsp;μm None of these
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