Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 As the current flows through the wire It generates heat in the wire It produces sound in the wire Resistance of the wire decrease Voltage across the ends is the increase None of these
2 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is 1.24 x 10<sup>-10</sup>m 7.92 x 10<sup>-20</sup>m 2.78 x 10<sup>-14</sup>m 3.88 x 10<sup>-11</sup>m
3 CT scanning is the abbreviated name of Computed Technology Computed Technique Computed Technology Computerized Technique
4 The first shell near the neucles is L-shell X-shell N-shell M-shell
5 The fourth band is a: Silver band Red band Gold band Either A or C Either A or B
6 The life time of metastable state is equal to Life time of excited state Greater than by excited state Zero Less than by excited state
7 We can excite an atom by Bombardment of particles Radiating photons Providing potential difference All answer are true
8 The value of resistivity is the least for: Copper Aluminimum Silver Tungsten Iron
9 In a metal, the valence electrons are: Attached to individual atoms Not attached to individual atoms Free to move within the metal Both A and B Both A and C
10 Ultraviolet region lies in ______ series Layman Balmer P fund B racket
11 In gases, the charge carriers are: Electrons Positive ions Negative ions Both A and C Both A and B
12 Graph of Black body radiation is example of Band spectra Continuo's spectra Line spectra All
13 Photons must have energy equal to ev En hf None of these
14 In order to get interference using two light rays The sources should be monochromatic and coherent The sources should have the same frequency Superposition should be linear All of these
15 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called Diffraction Interference Polarization Dispersion
16 The locus of all points in a medium having same phase of vibration is called Crest Trough Wavelength Wave-front
17 Gaussian surface is always: Rectangular Spherical Cylinder Box shape Any of these
18 According to Huygen's principle light travels in straight line Light is a transvers wave Light has dual nature All points on the primary wave-front are the sources of secondary wavelets
19 The cause of mirage observed in deserts in bright sunlight is due to Refraction of light Reflection of light Scattering of light Total internal reflection of light
20 Coulomb multiplied by volt by volt gives the unit called: farad Ohm Second joule Watt
21 The velocity of light in vacuum can be changed by changing Frequency Amplitude Wavelength None of these
22 The image of the tip of a needle is never sharp because of Polarization of light Interference of light Diffraction of light Reflection of light
23 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength? Gamma rays, micro waves, visible light Radio waves, ultraviolet waves, X-rays Ultraviolet rays, infrared rays, micro waves Visible light, gamma rays, radio waves
24 Huygen's theory cannot explain Diffraction Interference Polarization Photoelectric effect
25 The contrast in the fringes in an interference pattern depends upon Fringe width Relative difference intensities of the two sources Distance between the slits Wavelength
26 Static electricity is produced by the transfer of: Electrons Protons One fluid Two fluid None of these
27 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity Fringe width will decrease Fringe width will increase Fringe width will remain unchanged Fringe will become less intense
28 The electric field lines start from: Positive charge Negative charge Either A and B Neutron An atom
29 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory Refraction Reflection Diffraction Formation of spectrum
30 The photocopying process is called: Geography Sonography Xerography Zerography None of these
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