1. The smallest and most fundamental unit of matter (Non-Living things) is
a) Atom
b) Molecule
c) Proton
d) Electron
Answer. a) Atom is the smallest and most fundamental unit of matter.
Atom < Molecule < Elements
2. How many total confirmed elements are on Earth?
a) 117
b) 118
c) 119
d) 120
Answer. b) 118
One new element also discovered which name is Ununennium (Uue), also known as eka-francium or element 119. However, it is not fully accepted.
3. The characteristics of the wire used in fuses are
a) Low resistive power/high melting point
b) Low resistive power /low melting point
c) High resistive power /low melting point
d) High resistive power /high melting point
Answer. c) High resistive power /low melting point
4. The most commonly used substances in fluorescent tubes are
a) Sodium Oxide and Argon
b) Sodium Vapour and Neon
c) Mercury Vapour and Argon
d) Mercuric Oxide and Neon
Answer. c) Mercury Vapour and Argon
5. Which one of the following metals is accessed in the native state?
a) Aluminum
b) Gold
c) Chromium
d) Zinc
Answer. b) Gold
6. The full form of C.F.L. is
a) Compact Fluorescent Lamp
b) Centrally Fixed Lamp
c) Chemical Fluorescent Lamp
d) Condensed Fluorescent Lamp
Answer. a) Compact Fluorescent Lamp
7. What gases are filled in the Fluorescent tube?
a) Neon
b) Sodium
c) Mercury
d) Mercury and Neon
Answer. d) Mercury and Neon
8. A "fluorescent tube" is preferred over an electric bulb, because-
a) It has more external surface to transmit /radiate light
b) Voltage fluctuations do not affect this
c) The electric energy in the tube is almost completely converted to light
d) None of the above
Answer. d) None of the above
9. Thermodynamically the most stable form of carbon is ( UPPSC 2022 PYQ)
a) Diamond
b) Fullerenes
c) Graphite
d) Coal
Answer. c) Graphite
Graphite is thermodynamically the most stable form of carbon. Graphite is also known as black LED. It is hexagonal in shape. It is non-metal, however, it is a good conductor of Heat and electricity. Graphite is used as a moderator in nuclear reactors.
10. Which one of the following pairs is not correctly matched? ( UPPSC PYQ)
a) Bleaching powder - Calcium oxychloride
b) Plaster of Paris - Calcium bicarbonate
c) Washing Powder - Sodium Carbonate
d) Baking Soda - Sodium Bicarbonate
Answer. b) Plaster of Paris - Calcium bicarbonate. The chemical name of Plaster of Paris is calcium sulfate.
11. Which of the following metals is NOT stored in Oil? ( UPPSC PYQ)
a) Lithium
b) Sodium
c) Potassium
d) Magnesium
Answer. d) Magnesium
12. Which material contains the maximum amount of Sulphur? ( UPPSC PYQ)
a) Ammonium Sulphate
b) Potassium Sulphate
c) Single Superphosphate
d) Gypsum
Answer. a) Ammonium Sulphate
13. The oxidation of xanthine is catalyzed by xanthine dehydrogenase contains which element? ( UPPSC PYQ)
a) Zinc
b) Manganese
c) Boron
d) Molybdenum
Answer. d) Molybdenum
14. The electrically controlled magnetic material used in machines should have-
a) Low permeability and high saturation flux density
b) Low permeability and low saturation flux density
c) High permeability and high saturation flux density
d) High permeability and low saturation flux density
Answer. c) High permeability and high saturation flux density
15. A Zener diode is used as a
a) Current regulator
b) Voltage regulator
c) Voltage booster
d) Power regulator
Answer. b) Voltage regulator
16. What do TRIP steels stand for?
a) Transformation-induced porosity
b) Transformation-induced plasticity
c) Transformation induced pearlite
d) Transformation induced property
Answer. b) Transformation-induced plasticity
17. Which one of the following elements forms the maximum number of compounds?
a) Hydrogen
b) Carbon
c) Nitrogen
d) Oxygen
Answer. b) Carbon
18. Which of the following is made up of carbon only?
a) Kevlar
b) Lexan
c) Graphene
d) Spider Silk
Answer. c) Graphene
19. Graphene is
a) An alloy of carbon
b) Nanostructure of carbon
c) Isotope of Carbon
d) None of the above
Answer. b) Nanostructure of carbon
20. Pencil lead is
a) Graphite
b) Charcoal
c) Lamp black
d) Coal
Answer. a) Graphite
21. Buckminster Fullerene is
a) A form of carbon compound of clusters of 60 carbon atoms bond together in a polyhedral structure composed of pentagons or Hexagons
b) A Polymer of fluorine
c) An isotope of carbon heavier than C14
d) none of these
Answer. a) A form of carbon compound of clusters of 60 carbon atoms bond together in a polyhedral structure composed of pentagons or Hexagons
22. The unit of weight in the sale of diamonds is carat. One carat is equal to
a) 100 mg
b) 200 mg
c) 300 mg
c) 400 mg
Answer. b) 200 mg
23. Which one of the following materials is strongest?
a) German Silver
b) Brass
c) Steel
d) Graphene
Answer. d) Graphene
24. Which one of the following catalysts is used in the hydrogenation of vegetable oils?
a) Zinc
b) Platinum
c) Nickel
d) Iron
Answer. c) Nickel
25. Which of the following catalysts is used for the hydrogenation of vegetable oils?
a) Zinc Powder
b) Of Nickel
c) Platinum
d) Copper
Answer. b) Of Nickel
26. Which of the following substances is used for polishing utensils?
a) Alum
b) Calomel
c) Zinc Chloride
d) Zinc Oxide
Answer. d) Zinc Oxide
27. The element that is not found in fertilizer is
a) Nitrogen
b) Hydrogen
c) Chlorine
d) Phosphorus
Answer. b) Hydrogen
28. Match List I with List II and select the correct answer using the codes given below the lists:
List I List II
A. Iron 1. Photography
B. Lead 2. Lightning Conductor
C. Silver 3. Hemoglobin
D. Copper 4. Accumulator battery
Copper:
A B C D
a) 1 2 3 4
b) 4 3 2 1
c) 2 1 4 3
d) 3 4 1 2
Answer. d) 3 4 1 2
29. Match List I with List II and choose the correct answer from the code given below:
List I List II
A. Morphine 1. Antiseptic
B. Sodium 2. Alloy
C. Boric Acid 3. Analgesic
D. German Silver 4. Kerosene Oil
Code:
A B C D
a) 4 3 1 2
b) 2 4 3 1
c) 3 1 4 2
d) 3 4 1 2
Answer. d) 3 4 1 2
30. Which one of the following is called the "Metal of the Future"?
a) Copper
b) Iron
c) Titanium
d) Aluminum
Answer. c) Titanium
31. Which one of the following is not correctly matched?
a) Magnesium: Fireworks
b) Uranium: The atom bomb
c) Silver: Electric bulb
d) Zinc: Galvanization
Answer. c) Silver: Electric bulb
32. What is the percentage of lead in led pencils?
a) 0 %
b) 10 %
c) 90 %
d) 100 %
Answer. a) 0 %; it is made up of graphite
33. When the TV is switched on, then
a) Both audio and visual begin simultaneously
b) The audio is heard immediately but the scene appears later, as the scene requires some practice time.
c) The scene starts immediately but the audio is heard later because the sound moves faster than the light
d) This T.V. Depends on the brand
Answer. a) Both audio and visual begin simultaneously
34. There are two bulbs in one house, one of them gives more light than the other. Which of the following statements is correct?
a) The brightness of the light is not dependent on the Resistance
b) The resistance is the same in both bulbs
c) The more light the bulb has the greater the resistance
d) The dim bulb has the greater the resistance
Answer. d) The dim bulb has the greater the resistance
35. Of the two bulbs in the house, one glows brighter than the other. Which of the two has a larger resistance?
a) The dim bulb
b) The brighter bulb
c) Both have the same resistance
d) The brightness does not depend on the resistance
Answer. a) The dim bulb
36. Electric motors operating at low voltages tend to burn out because-
a) They draw more current which is inversely proportional to the voltage
b) They draw more current which is inversely proportional to the square root of the voltage
c) They draw heat proportional to V^2
d) Low voltages set in electrical discharge
Answer. a) They draw more current which is inversely proportional to the voltage
37. The filament of an electrical bulb is made of
a) Magnesium
b) Iron
c) Nichrome
d) Tungsten
Answer. d) Tungsten
38. Statements ( A) and reason ( R) are given below. After studying, select the correct answer from the codes given below-
Statement (A): Lightening drivers protect buildings from destruction
Reason ( R): They send the charge to the earth.
Code:
a) ( A) and ( R) are both correct, and ( R) is the correct explanation of ( A).
b) (A) and ( R) are both true, and (R) is not the correct explanation of ( A)
c) (A) is true, but (R) is false.
d) ( A) is false, but ( R) is true.
Answer. a) ( A) and ( R) are both correct, and ( R) is the correct explanation of ( A).
39. The meaning of "Earth" in electrical devices is -
a) To reduce expenses
b) Because the devices work in 3-phase
c) For security
d) As fuses
Answer. c) For security
40. Electrical current does not flow between two charged objects connected if they are
a) At the same velocity
b) On the same capacity
c) At equal resistivity
d) At the same voltage
Answer. d) At the same voltage
41. Which of the following is a good conductor of electricity?
a) Aluminium
b) Copper
c) Silver
d) Gold
Answer. c) Silver
42. Which of the following is the purpose for which a transformer is used?
a) To convert AC into DC
b) To convert DC into AC
c) To set up and step down AC voltage
d) To set up DC voltage
Answer. c) To set up and step down AC voltage
43. A mobile phone charger is
a) An inverter
b) A UPS
c) A step-up transformer
d) A step-down transformer
Answer. d) A step-down transformer
44. The device used for converting alternating current to direct current is called-
a) Inverter
b) Rectifier
c) Transformer
d) Transmitter
Answer. b) Rectifier
45. The earth's magnetic field due to
a) Currents circulating inside the core
b) Presence of a huge magnet at its center
c) Moving charge in space outside
d) None of the above
Answer. a) Currents circulating inside the core
46. At which temperature superconductivity can be of tremendous economic interest saving billions of rupees?
a) At very low temperature
b) At a temperature when the semiconductor becomes a Superconductor
c) At room temperature
d) At a very high temperature
Answer. c) At room temperature
47. The newly discovered high-temperature superconductors?
a) Metal alloys
b) Pure rare earth metals
c) Ceramic oxides
d) Inorganic polymers
Answer. c) Ceramic oxides
48. On heating the resistance of a semiconductor
a) remains constant
b) Decreases
c) Increases
d) Neither of the above
Answer. b) Decreases
49. Which of the following is an important part of the transistor?
a) Arsenic
b) Germanium
c) Osmium
d) Radium
Answer. b) Germanium
50. The most commonly used substance for making transistors is
a) Aluminium
b) Silicon
c) Copper
d) Silver
Answer. b) Silicon
51. Statement ( A): In making lightning conductors, copper bars are preferred over iron rods.
Reason ( R): Copper is more conductive to electricity than iron and is not easily oxidized under atmospheric conditions.
Consider the above statements and select the correct answer from the codes given below:
Code:
a) (A) and ( R) are both correct, and ( R) is the correct explanation of (A).
b) (A) and (R) are both true, and (R) is not the correct explanation of (A)
c) (A) is true, but ( R) is false
d) (A) is false, but (R) is true.
Answer. a) (A) and ( R) are both correct, and ( R) is the correct explanation of (A).
52. Which of the following is a semiconductor?
1. Silicon
2. Quarters
3. Ceramics
4. Germanium
Choose the correct answer in the following options-
a) 1 and 2
b) 1 and 3
c) 1 and 4
d) 3 and 4
Answer. c) 1 and 4
53. Which of the following is a "semiconductor"?
a) Plastic
b) Aluminium
c) Wood
d) Germanium
Answer. d) Germanium
54. Which of the following elements is a semiconductor?
a) Aluminum
b) Silicon
c) Silver
d) Lead
Answer. b) Silicon
55. The electronic configuration of an element is 2, 7, 4. The name of this element is-
a) Sodium
b) Magnesium
c) Calcium
d) Silicon
Answer. d) Silicon
56. Which of the following pairs is used to form the terminals of a normal torch cell?
a) Zinc - Carbon
b) Copper - Zink
c) Zink - Cadmium
d) Carbon - Copper
Answer. a) Zinc - Carbon
57. Which one of the following metals is not attracted by a magnet?
a) Iron
b) Nickel
c) Cobalt
d) Aluminum
Answer. d) Aluminum
58. Which of the following is the non-electromagnetic element?
a) Nickel
b) Cobalt
c) Chromium
d) Copper
Answer. d) Copper
59. Which of the following is a fundamental element
a) Sand
b) Diamond
c) Marble
d) Sugar
Answer. b) Diamond
60. Which one of the following elements is kept safely in Kerosene oil?
a) Sodium
b) Copper
c) Mercury
d) Silver
Answer. a) Sodium
61. Nowadays yellow lamps are frequently used as street lights. Which one of the following is used on these lamps?
a) Sodium
b) Neon
c) Hydrogen
d) Nitrogen
Answer. a) Sodium
62. Sodium vapor lamps are often used for street lighting because
a) They are cheap
b) its light is monochromatic and does not split when passing through water droplets
c) it is pleasing to the eyes
d) It is brightly illuminating
Answer. b) its light is monochromatic and does not split when passing through water droplets
63. The chemical name of limestone is?
a) Calcium Carbonate
b) Magnesium Chloride
c) Sodium Chloride
d) Sodium Sulphide
Answer. a) Calcium Carbonate
64. In which of the following industries is mica used as raw materials?
a) Iron and steel
b) Toys
c) Glass and Pottery
d) Electrical Industry
Answer. d) Electrical Industry
65. Which of the following liquids is a very good conductor of heat?
a) Mercury
b) Water
c) Ether
d) Benzene
Answer. a) Mercury
66. Which one of the following metals is liquid at ordinary temperature?
a) Lead
b) Nickel
c) Mercury
d) Tin
Answer. c) Mercury
67. Match List I ( naturally occurring substances) with List II ( elements) and Select the correct answer using the codes given below the lists
List I List II
A. Diamond 1. Calcium
B. Marble 2. Silicon
C. Sand 3. Aluminum
D. Ruby 4. Carbon
Codes:
A B C D
a) 3 1 2 4
b) 4 2 1 3
c) 2 1 3 4
d) 4 1 2 3
Answer. d) 4 1 2 3
68. Which of the following alloys is called Amalgam?
a) Zinc -copper
b) Copper - tin
c) Mercury - Zinc
d) Lead - Zinc
Answer. c) Mercury - Zinc
69. Solder is an alloy
a) of tin and lead
b) of tin and copper
c) of tin, copper, and zinc
d) of tin, lead, and zinc
Answer. a) of tin and lead
70. Bronze is an alloy of
a) Copper and tin
b) Copper and silver
c) Copper and zinc
d) Copper and lead
Answer. a) Copper and tin
71. The percentage of silver in German silver is
a) 1 %
b) 5 %
c) 0 %
d) None of those
Answer. c) 0 %
72. Which metal is combined in brass
a) Copper and Nickel
b) Copper and Tin
c) Copper and zinc
d) Copper, zinc, and Nickel
Answer. b) Oxygen and helium;
72. Resistance switching is used in case of
a) Bulk oil circuit breaker
b) Minimum oil circuit breaker
c) Air blast circuit breaker
d) All types of circuit breakers
Answer. c) Air blast circuit breaker
73. When the temperature exceeds the transition temperature, a ferromagnetic material becomes similar to -
a) Anti-Ferromagnetic material
b) Diamagnetic Material
c) Paramagnetic material
d) None of the above
Answer. c) Paramagnetic material
74. The bonding in ceramics is -
a) Ionic
b) Metallic
c) Covalent
d) Partially ionic and partially covalent
Answer. c) Covalent
75. Negative resistance is incorporated in the oscillator for
a) Sustained Oscillation
b) Damped Oscillation
c) To shield the Oscillator
d) Increasing amplitude of Oscillation
Answer. a) Sustained Oscillation
76. The carrier's current protection scheme is normally used for
a) LV Cable
b) HV Cable only
c) LV transmission line
d) HV transmission line only
Answer. d) HV transmission line only
77. How two identical bulbs should be connected to get maximum light?
1. Both are connected in series.
2. Both are connected in Parallel
Select the correct answer using the code given below-
Code:
a) In case 1
b) In case 2
c) Same in both 1 and 2
d) Nothing can be said
Answer. b) In case 2
78. Steel is further processed to obtain stainless steel by adding some elements. Which one of the following is not used for this purpose?
a) Carbon
b) Silicon
c) Manganese
d) Nickel
Answer. b) Silicon
79. The important metal used with iron to produce stainless steel is
a) Aluminum
b) Chromium
c) Tin
d) Carbon
Answer. b) Chromium
80.
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