10th class physics unit 7 MCQs
chapter 7 MCQs 10th Class physics
Basic Electronics:
1. The process by which electrons are emitted by a hot metal surface is known as:
a. Conduction
b. Boiling
c. Thermionic emission
d. Evaporation
2. The particles emitted from a hot cathode surface are:
a. Protons
b. Positive ions
c. Electrons
d. Negative ions
3. The potential of tungsten filament to produce beam of electrons in thermionic emission is:
a. 9V
b. 3V
c. 12V
d. 6V
4. The particles emitted from the hot surface of cathode are:
a. Protons
b. Positive ions
c. Electrons
d. Negative ions
5. The branch of applied Physics which deals with the control of motion of electrons using different devices is called:
a. Electronics
b. Electromagnet
c. Static electricity
d. Current electricity
6. J.J. Thomson observed the deflection of cathode rays by both electric and magnetic fields in:
a. 1899
b. 1897
c. 1896
d. 1898
7. The charge on cathode rays is:
a. Zero
b. Positive
c. No charge
d. Negative
8. The negatively charged particles were named as:
a. Neutrons
b. Protons
c. Cathode rays
d. Electrons
9. The current from tungsten filament to produce beam of electrons in thermionic emission is:
a. 0.3 A
b. 0.1 A
c. 0.2 A
d. 0.4 A
10. Metals conduct electricity due to the presence of:
a. Alpha particles
b. Protons
c. Free electrons
d. Neutrons
11. The charge on cathode is:
a. Neutral
b. Positive
c. No charge
d. Negative
12. The charge on anode is:
a. Neutral
b. Positive
c. No charge
d. Negative
13. In an electric field, the beam of electrons was deflected towards:
a. No deflection occurs
b. Positive plate
c. Towards center
d. Negative plate
14. In a magnetic field, the beam of electrons was deflected towards:
a. No deflection
b. North pole
c. Towards center
d. South pole
15. In an electric field, the deflection of electron beam is proportional to the:
a. Area of the tube
b. Strength of electric field
c. Amount of electrons
d. Size of plate
16. The screen of cathode ray is made of a material called:
a. Phosphor
b. Zinc
c. Glass
d. Iron
17. The grid potential of cathode ray oscilloscope is:
a. Neutral
b. Positive
c. Zero
d. Negative
18. Deflecting plates are the components of:
a. Fluorescent tube
b. Radio
c. Computer
d. C R O
19. The components of cathode ray oscilloscope are:
a. Four
b. Two
c. Six
d. Three
20. An application of cathode ray oscilloscope is:
a. Satellite
b. DC motor
c. Picture tube in TV set
d. Dish antenna
21. In cathode ray oscilloscope, the number of electrons reaching the screen determines the ……… of the screen:
a. Brightness
b. Size
c. Temperature
d. Efficiency
22. The instrument used for displaying heartbeats is:
a. TV set
b. Galvanometer
c. CRO
d. Computer
23. Which component of CRO is used as brightness control?
a. Fluorescent screen
b. Electron gun
c. Deflecting plates
d. None
24. The quantities whose values vary continuously are known as:
a. Analogue quantities
b. Scalar quantities
c. Digital quantities
d. Physical quantities
25. An analogue signal is:
a. Intensity
b. Day and night
c. Temperature
d. Calculators
26. The quantities whose values remain constant are known as:
a. Analogue quantities
b. Scalar quantities
c. Digital quantities
d. Physical quantities
27. The circuits which process analogue quantities are called:
a. Digital to analogue convertor
b. Analogue to digital convertor
c. Digital electronics
d. Analogue electronics
28. An analogue circuit is:
a. Receiver
b. TV
c. Computer
d. Amplifier
29. The quantities whose values vary in non-continuous manner are known as:
a. Analogue quantities
b. Scalar quantities
c. Digital quantities
d. Physical quantities
30. The branch of electronics which deals with digital quantities are called:
a. Digital to analogue convertor
b. Analogue to digital convertor
c. Digital electronics
d. Analogue electronics
31. Digital electronics uses only ……… digits for their representation:
a. 3
b. 1
c. 4
d. 2
32. A special circuit which is designed to convert analogue signal into digital signal is called:
a. Digital to analogue convertor
b. Analogue to digital convertor
c. Digital electronics
d. Analogue electronics
33. A special circuit which is designed to convert digital signal into analogue signal is called:
a. Digital to analogue convertor
b. Analogue to digital convertor
c. Digital electronics
d. Analogue electronics
34. George Boole discovered:
a. Main algebra
b. Boolean algebra
c. Geometry
d. Arithmetic algebra
35. The total possible states of a switch are:
a. Four
b. Two
c. Five
d. Three
36. Such things which have only two possible states are called:
a. Binary variables
b. Analogue quantities
c. Different quantities
d. Digital quantities
37. If X=A-B, then X is 1 when:
a. A is 0 and B is 1
b. A and B are 1
c. A is 1 and B is 0
d. A or B is 0
38. In AND operation, if A is 0 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
39. In AND operation, if A is 1 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
40. In AND operation, if A is 0 and B is 0, then output will be:
a. 1
b. 0
c. Both
d. Varying
41. The Boolean expression for AND operation is:
a. X = ⎯⎯⎯⎯⎯⎯⎯/A .B
b. X = A + B
c. X = ⎯⎯⎯⎯⎯⎯⎯⎯⎯/A+B
d. X = A.B
42. There are ……… possible states for an AND operation:
a. 4
b. 2
c. 5
d. 3
43. The total number of inputs in AND operation is:
a. Three
b. One
c. Four
d. Tow
44. The total number of outputs is AND operation is:
a. Three
b. One
c. Four
d. Tow
45. When input of OR gate is 1, then output X will be:
a. A = 0 , B = 0
b. A = 0 , B = 1
c. A = 1 , B = 0
d. All
46. When input of OR gate is 0, then output X will be:
a. A = 0 , B = 0
b. A = 0 , B = 1
c. A = 1 , B = 1
d. A = 1 , B = 0
47. In OR operation, if A is 0 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
48. In OR operation, if A is 1 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
50. The Boolean expression for OR operation is:
a. X = ⎯⎯⎯⎯⎯⎯⎯/A .B
b. X = A + B
c. X = ⎯⎯⎯⎯⎯⎯⎯⎯⎯/A +B
d. X = A.B
51. There are ……… possible states for an OR operation:
a. Four
b. Two
c. Five
d. Three
52. The total number of inputs in OR operation is:
a. Three
b. One
c. Four
d. Two
53. The total number of outputs is OR operation is:
a. Three
b. One
c. Four
d. Two
54. The basic operation of NOT gate is called:
a. Inversion
b. Addition
c. Subtraction
d. Multiplication
55. The number of input terminals in NOT Gate is:
a. Many
b. One
c. Three
d. Two
56. Equation of NOT operation is:
a. X = ⎯⎯⎯ A
b. X = A.B
c. X = ⎯⎯⎯⎯⎯⎯⎯/A .B
d. X = A + B
57. The number of output terminals in NOT Gate is:
a. Three
b. One
c. Many
d. Two
58. In NOT operation, if A=1 then output will be:
a. 1
b. 0
c. Both
d. None
59. In NOT operation, if A=0 then output will be:
a. 1
b. 0
c. Both
d. None
60. The output of a NAND gate is 0 when
a. Any of its inputs is 0
b. Any of its inputs is 0
c. Any of its inputs is 0
d. Both of its inputs are 1
61. In NAND operation, if A is 0 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
62. In NAND operation, if A is 1 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
63. In NAND operation, if A is 1 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
64. The Boolean expression for NAND operation is:
a. X = ⎯⎯⎯⎯⎯⎯⎯/A .B
b. X = A + B
c. X = ⎯⎯⎯⎯⎯⎯⎯⎯⎯/A +B
d. X = A.B
65. There are ……… possible states for a NAND operation:
a. Four
b. Two
c. Five
d. Three
66. The total number of inputs in NAND operation are:
a. Three
b. One
c. Four
d. Two
67. The total number of inputs in NAND operation are:
a. Three
b. One
c. Four
d. Two
68. AND gate can be formed by using two
a. NOR gates
b. NOT gates
c. NAND gates
d. OR gates
69. The output of a two-input NOR gate is 1 when:
a. Both A and B are 0
b. A is 1 and B is 0
c. Both A and B are 1
d. A is 0 and B is 1
70. When output of two NOR gates is 1, then:
a. A = 0 , B = 0
b. A = 1 , B = 0
c. A = 1 , B = 1
d. A = 0 , B = 1
71. In NOR operation, if A is 0 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
72. In NOR operation, if A is 0 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
73. In NOR operation, if A is 0 and B is 1, then output will be:
a. 1
b. 0
c. Both
d. Varying
74. The Boolean expression for NOR operation is:
a. X = ⎯⎯⎯⎯⎯⎯⎯/A .B
b. X = A + B
c. X = ⎯⎯⎯⎯⎯⎯⎯⎯⎯/A +B
d. X = A.B
75. There are ……… possible states for a NOR operation:
a. Four
b. Two
c. Five
d. Three
76. The total number of inputs in NOR operation are:
a. Three
b. One
c. Four
d. Tow
77. The total number of outputs is NOR operation are:
a. Three
b. One
c. Four
d. Tow
78. Which of the following gates is used to make burglar alarm?
a. NOR gate
b. AND gate
c. NAND gate
d. OR gate
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