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 An electronic computer is basically a vast arrangement of electronic switches which are made from Resistors Transistors N -type crystals P-Type crystals Capacitors
2 To display a digit of EIGHT, the number of ON LED'S are: Two Three Five Seven Eight
3 To make an LED, it is impreacticable to use: Silicon Gallium arsenide Gallium arsenide phosphide Iron Both (B) and (C)
4 In the text book, the transistor amplifier circuit is a: Common emitter circuit Common collector circuit Common base circuit Any of these None of these
5 A transistor has: One region Two regions Three regions Four regions None is correct
6 The number of LED'S needed to display all the digits is: Four Five Nine Six Seven
7 A diode which can turn its current ON and OFF in nono seconds is called: LED Photodiode An ordinary diode. Both (A) and (B) Both (B) and (C)
8 In full wave rectification, simultaneous action is that: Two diodes conduct and two do not. One diode conduct and three do not. Three diodes conduct and one does not. All the four diodes conduct None of these
9 In reverse-biased p-n junction, the reverse current is due to flow of: Minority charge carriers Majority charge carriers Free electrons from p to n-region Holes from n to p-region all are true except (B)
10 In the forward biases situation, the current flowing across the p-n junction is a few: amperes Milli amperes Micro amperes Pico amperes None of these
11 A potential barrier of 0.7 V exists across p-n junction made from: Germanium Silicon Arsenic Gallium Indium
12 A hole in p-type my be due to: Trivalent impurity Breking of some covalent bond Pentavalent impurity Germanium Either (A) or (B)
13 Majority charge carriers in the p-region of p-n junction are: electrons positrons Holes Neutrons None of these
14 All the valence electrons present in a crystal of silicon are bound in their orbits by Ionic bond covalent bond Molecular bond Both (A) and (B) Both (B) and (C)
15 Crystal of germanium or silicon in its pure form at absolute zero acts as: A conductor A semiconductor an insulator Both (A) and (C) Both (A) and (B)
16 The use of chips in electrons is described in the form of: Yellow boxes Black boxes Red boxes White boxes Orange boxes
17 Silicon is one of the mot commonly used: onductor Dielectric Insulator Semiconduction Both (B) and (C)
18 Tick the one which is not polymer solid:
 Zirconia Polythene Nylon Synthetic rubber None of these
19 Polymers are the chemical combination of carbon with: Nitrogen Oxygen Hydrogen All of these None of these
20 Examples of crystalline solids are: Cooper NaCl Zirconia Both (A) and (B) All of these
21 Examples of polymeric substances are: Plastic Synthetic rubbers Zirconia All of these Both (A) and (B)
22 A structure of polymeric solid is: An ordered structure A disordered structure Intermediate between order and disorder Any of these None of these
23 When relatively simple molecules are chemically combined into massive molecules, the reaction is called: Fission reaction Fusion reaction Polymerization Any of these None of these
24 Each atom in metal crystal: Remains fixed Vibrates about a fixed point Moves randomly Rotates about center of a crystal None of these
25 The smallest three dimensional basic structure is called as: An atom Unit cell Crystal lattice Polymer None of these
26 In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of: Adhesive force Nuclear forces Inter atomic cohesive force Electromagnetic force None of these
27 The pattern of NaCl particles have a shape which is : Cubic Body centred cubic Simple cubic face centred Both (A) and (C)
28 The whole structure obtained by the repetition of unit cells is called: Crystal lattice Amorphous solid Polymeric solid Polysterne None of these
29 The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called: Critical temparature Temperature of vaporization Melting point Both (A) and (C) Both (A) and (B)
30 Tick the one which is not a crystalline solid: Zirconia Glass Copper Ceramic solid An ionic compound
Download This Set

Is this page helpful?