Q. What is the power consumed by a 6Ω resistor when a current of 2A flows through it? (2023)
A.
12W
B.
24W
C.
6W
D.
8W
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Solution
Power (P) is given by P = I²R = (2A)² * 6Ω = 4 * 6 = 24W.
Correct Answer: A — 12W
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Q. What is the power consumed by a 6Ω resistor when a current of 3A flows through it? (2021)
A.
18W
B.
9W
C.
36W
D.
12W
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Solution
Power (P) is given by P = I^2 * R = (3A)^2 * 6Ω = 9 * 6 = 54W.
Correct Answer: A — 18W
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Q. What is the power consumed in an AC circuit with a voltage of 230V and a current of 5A with a power factor of 0.8? (2023)
A.
920W
B.
1150W
C.
115W
D.
460W
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Solution
Power = V × I × Power Factor = 230V × 5A × 0.8 = 920W.
Correct Answer: A — 920W
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Q. What is the power factor in a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)
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Solution
Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.
Correct Answer: D — √2/2
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Q. What is the power factor in an AC circuit with a phase angle of 30 degrees? (2022)
A.
0.5
B.
0.866
C.
1
D.
0.707
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Solution
The power factor is cos(30°) = √3/2 ≈ 0.866.
Correct Answer: B — 0.866
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Q. What is the power factor of a circuit with a resistance of 30Ω and a reactance of 40Ω? (2023)
A.
0.6
B.
0.75
C.
0.8
D.
1.0
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Solution
Power factor = R/Z where Z = √(R² + X²). Calculate.
Correct Answer: A — 0.6
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Q. What is the power factor of a circuit with a resistance of 4Ω and a reactance of 3Ω? (2021)
A.
0.6
B.
0.8
C.
1.0
D.
0.75
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Solution
Power factor = R/Z = R/√(R² + X²) = 4/√(4² + 3²) = 4/5 = 0.8.
Correct Answer: A — 0.6
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Q. What is the power factor of a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)
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Solution
Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.
Correct Answer: D — √2/2
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Q. What is the power factor of a circuit with a resistance of 5Ω and an inductive reactance of 5Ω? (2022)
A.
0.5
B.
0.707
C.
1
D.
0
Show solution
Solution
Power factor = R/Z = 5 / √(5² + 5²) = 5 / √50 = 0.707.
Correct Answer: B — 0.707
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Q. What is the power factor of a circuit with a resistance of 8Ω and a reactance of 6Ω? (2023)
A.
0.5
B.
0.6
C.
0.8
D.
1.0
Show solution
Solution
Power factor = R/Z, where Z = √(R² + X²) = √(8² + 6²) = 10. Thus, PF = 8/10 = 0.8.
Correct Answer: C — 0.8
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Q. What is the power factor of an AC circuit with a phase angle of 60°? (2022)
A.
0.5
B.
0.866
C.
1
D.
0.707
Show solution
Solution
The power factor is cos(60°) = 0.5.
Correct Answer: B — 0.866
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Q. What is the power output of a motor that does 1200 J of work in 30 seconds?
A.
20 W
B.
40 W
C.
60 W
D.
80 W
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Solution
Power = Work / Time = 1200 J / 30 s = 40 W.
Correct Answer: C — 60 W
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Q. What is the power output of a motor that does 3000 J of work in 15 seconds?
A.
200 W
B.
300 W
C.
400 W
D.
500 W
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Solution
Power = Work / Time = 3000 J / 15 s = 200 W.
Correct Answer: B — 300 W
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Q. What is the pressure exerted by a force of 100 N over an area of 5 m²? (2023)
A.
20 Pa
B.
25 Pa
C.
15 Pa
D.
30 Pa
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Solution
Pressure (P) = Force/Area = 100 N / 5 m² = 20 Pa.
Correct Answer: B — 25 Pa
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Q. What is the pressure exerted by a force of 200 N acting on an area of 4 m²? (2015)
A.
50 Pa
B.
100 Pa
C.
200 Pa
D.
400 Pa
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Solution
Pressure = Force/Area = 200 N / 4 m² = 50 Pa.
Correct Answer: B — 100 Pa
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Q. What is the primary characteristic of adsorption? (2023)
A.
It is a bulk phenomenon.
B.
It involves a chemical reaction.
C.
It is a surface phenomenon.
D.
It requires high temperature.
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Solution
Adsorption is a surface phenomenon where molecules adhere to the surface of a solid or liquid.
Correct Answer: C — It is a surface phenomenon.
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Q. What is the primary characteristic of gases compared to solids and liquids? (2023)
A.
Definite shape
B.
Definite volume
C.
High compressibility
D.
Low density
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Solution
Gases have high compressibility due to the large spaces between particles, unlike solids and liquids which have definite shape and volume.
Correct Answer: C — High compressibility
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Q. What is the primary characteristic of gases? (2023)
A.
Definite shape
B.
Definite volume
C.
Compressibility
D.
Incompressibility
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Solution
Gases are highly compressible due to the large spaces between particles, allowing them to occupy more volume when pressure is applied.
Correct Answer: C — Compressibility
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Q. What is the primary component of natural gas? (2020)
A.
Ethane
B.
Propane
C.
Methane
D.
Butane
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Solution
The primary component of natural gas is methane (CH4).
Correct Answer: C — Methane
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Q. What is the primary component of the cell membrane?
A.
Proteins
B.
Carbohydrates
C.
Phospholipids
D.
Nucleic Acids
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Solution
Phospholipids are the primary component of cell membranes, forming a bilayer.
Correct Answer: C — Phospholipids
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Q. What is the primary difference between liquids and gases? (2023)
A.
Shape
B.
Volume
C.
Compressibility
D.
Density
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Solution
Gases are highly compressible while liquids are not, due to the distance between particles in each state.
Correct Answer: C — Compressibility
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Q. What is the primary difference between solids and liquids in terms of particle arrangement? (2023)
A.
Solids have loosely packed particles
B.
Liquids have tightly packed particles
C.
Solids have fixed shape and volume
D.
Liquids have fixed shape but variable volume
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Solution
Solids have a fixed shape and volume due to closely packed particles, while liquids take the shape of their container but have a fixed volume.
Correct Answer: C — Solids have fixed shape and volume
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Q. What is the primary factor affecting the rate of adsorption of a gas on a solid surface?
A.
Temperature
B.
Pressure
C.
Surface area
D.
Molecular weight
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Solution
The rate of adsorption increases with the surface area of the solid, as more surface provides more sites for gas molecules to adhere.
Correct Answer: C — Surface area
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Q. What is the primary function of proteins in the body? (2023)
A.
Energy storage
B.
Catalyzing biochemical reactions
C.
Genetic information storage
D.
Cell membrane structure
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Solution
Proteins act as enzymes that catalyze biochemical reactions.
Correct Answer: B — Catalyzing biochemical reactions
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Q. What is the primary function of proteins in the body? (2023) 2023
A.
Energy storage
B.
Catalyzing biochemical reactions
C.
Genetic information storage
D.
Cell membrane structure
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Solution
Proteins primarily function as enzymes that catalyze biochemical reactions.
Correct Answer: B — Catalyzing biochemical reactions
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Q. What is the primary gas in the Earth's atmosphere? (2022)
A.
Oxygen
B.
Nitrogen
C.
Carbon Dioxide
D.
Hydrogen
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Solution
Nitrogen makes up about 78% of the Earth's atmosphere, making it the primary gas.
Correct Answer: B — Nitrogen
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Q. What is the primary mechanism of adsorption in activated charcoal?
A.
Chemical bonding
B.
Physical adsorption
C.
Capillary action
D.
Electrostatic attraction
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Solution
Activated charcoal primarily adsorbs substances through physical adsorption due to its high surface area and porous structure.
Correct Answer: B — Physical adsorption
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Q. What is the primary process involved in adsorption? (2023)
A.
Chemical reaction
B.
Physical attraction
C.
Evaporation
D.
Condensation
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Solution
Adsorption primarily involves physical attraction between the adsorbate and the surface of the adsorbent.
Correct Answer: B — Physical attraction
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Q. What is the primary process involved in the adsorption of gases on solid surfaces? (2022) 2022
A.
Diffusion
B.
Condensation
C.
Chemical reaction
D.
Van der Waals forces
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Solution
Adsorption of gases on solid surfaces primarily occurs due to Van der Waals forces, which are weak intermolecular forces that allow gas molecules to adhere to the surface.
Correct Answer: D — Van der Waals forces
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Q. What is the primary process involved in the formation of a colloidal solution? (2022)
A.
Evaporation
B.
Condensation
C.
Dispersion
D.
Sublimation
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Solution
Colloidal solutions are formed by the dispersion of fine particles in a medium, which is the process of dispersion.
Correct Answer: C — Dispersion
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