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 Intensity of light determines the: Energy of each photon Number of photons Speed of photons Size of photons None of these
2 Electromagnetic -radiation means: Photons protons Electrons Mesons None of these
3 The way through which electromagnetic radiations or photons interact with matter depends upon their: Wavelength Frequency Energy Temperature All of these
4 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is: Newton Joule Joule-Sec Joule-s<sup>-1</sup> Watt
5 Max Planck received the Nobel Prize for his discovery of energy quants in: 1718 AD 1918 AH 1818 AD 1918 AD None of these
6 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called: Wien's constant Stefen's constnat Planck's constant Boltzmann's constant None of these
7 Wien's constant is measured in: Metre per kelviin Metre kelvin Kelvin per meter Joules Dynes
8 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by: Lummer Planck Pringsheim Both (A ) and (B) Both (A) and (C)
9 When platinum wire is heated, then at the temperature of 500 oC, it becomes: Yellow Orange red Dull red White Cherry red
10 The nature of radiations emitted by a hot body depends upon its: Metarial Temperature colour Volume Length
11 When the atomic particle are moving with velocities approaching that of light: Newton's laws become valid Relativistic effects become prominent Botha(A) and (B) are valid Neither (A)nor (B) There mass becomes zero.
12 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem: Smaller Lerger Same Much larger None of these
13 the dilation of time applies to the timing processes which are: Physical Chemical Biological All of these None of these
14 Due to relative motion of observer and the frame of reference of events, time always: Dilates itself Contracts itself Stretches itself Both (A) and (C) None of these
15 Practically the quantity v/c is always: less than one Equal to one Greater then one all of these None of these
16 the symbol to be used in relativity problems denotes: Dilated time Proper time Life time Half time None of these
17 There is no way to detect: Absolute uniform motion Accelerated motion State rest State of motion None of these
18 The special theory of relativity is based on: Four postulates Three postulates Two postulates One postulate None of these
19 The special theory of relatively treats the problems involving: Inertial frames of reference Non-inertial frames Non-accelerated frame Botha (A) and (C) Both (B) and (C)
20 Strictly speaking, the earth is: An accelerated frame of reference A non-inertial frame of reference An inertial frame of reference <sup>A non-accelerated frame of reference</sup> Both (A) and (B)
21 The concept of direction is purely: Absolute Relative Relative to stars always Relative to the sun always None of these
22 Conversion of A.C. into D.C. is called: Reftification Amplification Electric induction Magnetic induction None of these
23 If both the inputs given to a gate ae 1 such that the output is 0, then it is: AND gate NOR gate OR gate NOT gate Both (A) and (C)
24 Truth table of logic function: Summarizes its output values Tabulates all its input conditions only Display all its input/output possibilites Is not based on logic algebra None of these
25 To designate the voltage as low or 0 by a logic gate, the specified minimum value is: 0.2 volt 0.8 volt 0 volt 2.0 volt 5.0 volt
26 Op-amp has been discussed as comparator of: Distances Voltages Velocities Magnetic fields Both (A) and (C)
27 To turn the transistor OFF, the base current is set: At maximum value At zero Either (A) or (B) All are correct None of correct
28 In AND gate, the output is 1 if: Both inputs are 0 Both inputs are 1 Only one input is 0 Both (A) and (B) Both (A) and (C)
29 A digital system deals with quantities which has discrete values: Two in number One in number Three in number Four in number None of these
30 The number of input terminals of an op-amp is: One Two Three Four None of these
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