51. A relay is an
Answer: B. electrically operated switch
Physics Class 10 Unit 18: Electronics MCQs
82 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 2 of 2.
Tap an option to check your answer.
52. Relays are used to control a high power circuit with a
Answer: A. low power circuit
53. A solid state relay (SSR) has
Answer: C. no moving parts
54. A transistor can be used as a switch if it is biased in the
Answer: D. saturation and cut-off regions
55. When there is no base current, the transistor is in
Answer: A. cutoff
56. When a large enough base current flows, the transistor is in
Answer: B. saturation
57. In the saturation state, the collector-emitter path behaves like a
Answer: D. closed switch
58. Digital electronic circuits deal with signals having
Answer: C. only two states
59. Boolean algebra is based on the three basic operators
Answer: A. AND, OR and NOT
60. Each digit in binary (0 or 1) is called a
Answer: B. bit
61. An analogue-to-digital converter (ADC)
Answer: C. converts continuous analogue signals into discrete digital signals
62. A digital-to-analogue converter (DAC)
Answer: D. converts digital signals into analogue signals
63. Analogue signals
Answer: A. vary continuously
64. A table of inputs and outputs of a logic system in binary form is called a
Answer: B. truth table
65. The three fundamental logic gates are
Answer: D. AND, OR and NOT
66. The output of an AND gate is 1 only when
Answer: C. all inputs are 1
67. The Boolean expression of an AND gate is
Answer: A. X = A.B
68. The output of an OR gate is 0 only when
Answer: B. all inputs are 0
69. The Boolean expression of an OR gate is
Answer: B. X = A + B
70. A NOT gate has
Answer: A. one input and one output
71. If the input of a NOT gate is 1, its output is
Answer: D. 0
72. NAND and NOR gates are called universal gates because
Answer: C. they can be used to make all the other gates
73. The output of a NAND gate is 0 when
Answer: C. both inputs are 1
74. The Boolean expression for a NAND gate is
Answer: A. X = NOT(A.B)
75. The output of a NOR gate is 1 only when
Answer: D. all inputs are 0
76. The Boolean expression for a NOR gate is
Answer: B. X = NOT(A + B)
77. A simple burglar alarm circuit can be made using an
Answer: B. AND gate
78. In a burglar alarm using an AND gate, the alarm is activated when
Answer: D. both the sensor and the alarm switch are ON
79. In the fire alarm circuit, when the thermistor is warmed by fire, its resistance
Answer: C. falls
80. Quantum computers use
Answer: A. qubits
81. A qubit can exist in
Answer: A. a superposition of multiple states
82. Quantum computers need core components to be cooled to
Answer: C. almost absolute zero
About Physics Class 10 Unit 18 MCQs (Federal Board)
These 82 Physics MCQs cover Class 10 Unit 18: Electronics of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 2 pages of 50. You can also read the Electronics notes for this chapter. Download the Electronics MCQs as a PDF using the button at the top of this page.