CHAPTER 16
BASIC ELECTRONICS
Encircle the most appropriate answer from the following options
(1) The branch of applied physics which deals with the behaviour of electrons using different devices for various useful purposes is
(a) light
(b) mechanics
(c) thermodynamics
(d) electronics
(2) Who observed the deflection of cathode rays by both electric nnd mngnetic fields?
(a) Newton
(b) J.J Thomson
(c) Plonk
(d) Charles
(3) Cathode rays contain negatively charged particles called:
(a) Neutrons
(b) protons
(c) electrons
(d) positrons
(4) The procedure of emission of electrons from the hot metal surface is called;
(a) dynamic emission
(b) electronic emission
(c) thermionic emission
(d) static emission
(5) Metals contain large number Of:
(a) free electrons
(b) Free protons
(c) Free neutrons
(d) bound elements
(6) For thermionic emission typical values of
(a) 3v, 0.4A
(b) 6V, 083A
(c) 5V, 0.3A
(d) 6V, 0.1A
(7) Electron gun Is used to investigate the properties of;
(a) electron beam
(b) nucleus
(c) neutron
(d) proton
(8) The degree of deflection of electrons from their original direction will proportional to;
(a) the speed of electron’
(b) the strength of the electric field applied
(c) the amount of current
(d) the potential difference
(9) A component of cathode-ray oscilloscope (C.R.O) is;
(a) the electron gun
(b) the deflecting plates
(c) a fluorescent screen
(d) all of given
(10) Electron gun has an electrode for controlling the flow of electron in the beam;
(a) grid C
(b) grid A
(c) grid B
(d) grid G
(1 1) The screen of a cathode-ray tube consists of a thin layer f’
(a) aluminium
(b) potassium
(c) phosphor
(d) sulphur
(12) Cathode-ray oscilloscope (C.R.O) is used in many field of science for;
(a) displaying waveforms
(b) measuring voltages
(c) range-finding
(d) all given are true
(13) To find the depth of sea-beds, C.R.O is used as:
(a) echo-sounding
(b) displaying waveforms
(c) measuring voltage
(d) range finding
(14) Analogue quantities are;
(a) whose values vary continuously
(b) whose values remain constant
(c) e.g. temperature of air
(d) All of above
(15) Time , pressure, distance are all:
(a) analogue quantities
(b) variable quantities
(c) nominal quantities
(d) digital quantities
(16) Which is an analogue circuit which amplifies the signals without. changing its shape to such an extent that it can operate a loudspeaker?
(a) Galvanometer
(b) Manometer
(c) amplifier
(d) Optical fiber
(17) The quantities whose value vary in non —continuous manner are called;
(a) analogue quantities
(b) digital quantities
(c) statistic quantities
(d) continuoüs quantiies
(18) Those quantities
whose value vary continuously or remain constant:
(a) Analogue
(b) Digital
(c) Hybrid
(d) All of them
(19) Which of the following is an analogue device?
(a) Electric fan
(b) Electric iron
(c) Radio receiver
(d) All of them
(20) Electronics which provides the data in the form of maximum and minimum voltage signals:
(a) Analogue
(b) Digital
(c) Hybrid
(d) All of them
(21) of the following are digital devices?
(a) Computer
(b) Mobile phone
(c) Digital camera
(d) All of them
(22) Circuits which convert the digital signal into analogue signals:
(a) ADC
(b) DAC
(c) CAD
(d) None of them
(23) Circuits which convert the analogue signal into digital signals:
(a) ADC
(b) DAC
(c) CAD
(d) None of them
(24) Digital electronics uses 2 digits
(a) 0,2
(b) 0,3
(c) 0,1
(d) 0,4
(25) A switch has how many possible states
(a) Two
(b) Three
(c) Four
(d) Five
(26). The binary variables are represented by the digits
(a) 1,2
(b) 0,2
(c) 0,3
(d) 0,1
(27). Boolean algebra invented a special algebra known as
(a) Boolean algebra
(b) Geometry
(c) Ratios
(d) Trigonometry
(28). Boolean algebra operates with two logical states represented by two distinct voltage level
(a) 0,2
(b) 0,3
(c) 0, 1
(d) 1,1
(29). Boolean algebra has __ number of operations
(a) 1
(b) 2
(c) 3
(d) 4
(30). In Boolean algebra zera represents
(a) zero potential
(b) Ground potential
(c) low potential
(d) Both a & b
(31) In Boolean Algebra 1 represents:
(a) 5V
(b) 1V
(c) Both a & b
(d) None of above
(32) The logical operation, whose output will only be one if its all inputs are 1:
(a) AND
(b) OR
(c) NOT
(d) All of above
(33) The logical operation, whose output will only be zero if its all inputs are zero:
(a) AND
(b) OR
(c) NOT
(d) All of above
(34) AND operation is just like combinations of resistors:
(a) Series
(b) Parallel
(c) Both
(d) None of above
(35) AND operations is represented by:
(a) Dot (.)
(b) Multiplication sign
(c) Any sign
(d) Both a & b
(36) OR operation is just like combinations of resistors:
(a) Serial
(b) Parallel
(c) Both
(d) None of above
(37) OR operations is represented by:
(a) Dot (.)
(b) Multiplication sign
(c) ‘+’ sign
(d) Both a & b
(38) The various operations of Boolean variables are also. called:
(a) Boolean constants
(b) Algebraic operations
(c) Logic operations
(d) Both b & c
(39) The circuit which implements the AND operation is called:
(a) AND gate
(b) AND circuit
(c) OR gate
(d) Both a & b
(40) The circuit which implements the OR operation is called:
(a) AND gate
(b) OR circuit
(c) OR gate
(d) Both
(41) The word “truth” that is used in Boolean algebra is borrowed from:
(a) Mathematics
(b) Italian
(c) Geometry
(d) Subject of Logic
(42) If switches Sl and S2 both are open the lamp is:
(a) ON
(b) OFF
(c) sometime ON and sometime OFF
(d) neither ON nor OFF
(43) NOT gate is also calléd;
(a) converter
(b) inverter
(c) adder
(d) subtractor
(44) NAND operation is simply an AND operation followed by a;
(a) NOR operation
(b) OR operation
(c) NOT operation
(d) AND operation
(45) NOT operation is also known as:
(a) Gate
(b) Inverter
(c) Converse
(d) All of above
(46) Number of input(s) of NOT operation are:
(a) 1
(b) 2
(c) 3
(d) 4
(47) The circuit which is used to implement NOT operation:
(a) AND gate
(b) NOT gate
(c) OR gate
(d) Both a & b
(48) NAND gate is the combination of:
(a) AND & OR
(b) AND & NOT
(c) NOT & OR
(d) None of them
(49) A and B are two inputs of NAND gate. Its output would be zero when
(a) A = 0, B = 0
(b) A = 1, B = 0
(c) A = 0, B = 1
(d) A = 1, B =1
(50) NOR gate is the combination of:
(a) AND & OR
(b) AND & NOT
(c) NOT & OR
(d) None of them
(51) A and B are the two inputs of NOR gate. Its output would be I when:
(a) A = 0, B = 0
(b) A = 1, B = 0
(c) A = 0, B = 1
(d) A = 1, B =1
(52) The output of the NAND Is written as;
(a) x = A + B
(b) x = A – B
(c) x = A.B
(d) x = A.B
(53) The NOR operation is simply an OR operation followed by ;
(a) NOT operation
(b) AND operation
(c) NANA operation
(d) OR operation