Q. What is the power consumed by a resistor of 10 ohms carrying a current of 2 A? (2023)
A.
20 W
B.
40 W
C.
10 W
D.
5 W
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Solution
Power P = I^2 * R = (2 A)^2 * 10 Ω = 4 * 10 = 40 W.
Correct Answer:
A
— 20 W
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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
Show solution
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
Show solution
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
Show solution
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)
Show solution
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 6Ω and a reactance of 8Ω? (2022)
A.
0.75
B.
0.8
C.
0.6
D.
1.0
Show solution
Solution
Power factor = R/Z = R/√(R² + X²) = 6/√(6² + 8²) = 6/10 = 0.6.
Correct Answer:
B
— 0.8
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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
Show solution
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 prefix for 10^6? (2022)
A.
Kilo
B.
Mega
C.
Giga
D.
Tera
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Solution
The prefix for 10^6 is Mega (M).
Correct Answer:
B
— Mega
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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
Show solution
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
Show solution
Solution
Pressure = Force/Area = 200 N / 4 m² = 50 Pa.
Correct Answer:
B
— 100 Pa
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Q. What is the primary active ingredient in aspirin? (2019)
A.
Acetylsalicylic acid
B.
Salicylic acid
C.
Acetic acid
D.
Benzoic acid
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Solution
Aspirin is chemically known as acetylsalicylic acid, which is used for pain relief and anti-inflammatory purposes.
Correct Answer:
A
— Acetylsalicylic acid
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Q. What is the primary advantage of asexual reproduction? (2022)
A.
Genetic diversity
B.
Rapid population increase
C.
Requires less energy
D.
All of the above
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Solution
Asexual reproduction allows for rapid population increase as it does not require a mate.
Correct Answer:
B
— Rapid population increase
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Q. What is the primary advantage of sexual reproduction? (2021)
A.
Faster reproduction
B.
Genetic diversity
C.
No need for a mate
D.
Lower energy requirement
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Solution
Sexual reproduction leads to genetic diversity, which can enhance survival in changing environments.
Correct Answer:
B
— Genetic diversity
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Q. What is the primary application of nuclear fusion? (2023)
A.
Nuclear power plants
B.
Hydrogen bombs
C.
Medical imaging
D.
Smoke detectors
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Solution
Nuclear fusion is primarily applied in hydrogen bombs, where fusion reactions release immense energy.
Correct Answer:
B
— Hydrogen bombs
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Q. What is the primary application of recombinant DNA technology in agriculture? (2020)
A.
Increased crop yield
B.
Pest resistance
C.
Improved nutritional value
D.
All of the above
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Solution
Recombinant DNA technology is used to enhance crop yield, provide pest resistance, and improve nutritional value, making option 'All of the above' the correct answer.
Correct Answer:
D
— All of the above
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Q. What is the primary application of recombinant DNA technology in medicine? (2020)
A.
Production of insulin
B.
Gene therapy
C.
Vaccines
D.
All of the above
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Solution
Recombinant DNA technology is used in various medical applications including the production of insulin, gene therapy, and vaccines.
Correct Answer:
D
— All of the above
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Q. What is the primary basis for the classification of living organisms? (2020)
A.
Habitat
B.
Morphology
C.
Genetic similarity
D.
Size
Show solution
Solution
Genetic similarity is the primary basis for the classification of living organisms.
Correct Answer:
C
— Genetic similarity
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Q. What is the primary benefit of probiotics? (2023)
A.
Increase weight
B.
Improve gut health
C.
Enhance vision
D.
Boost hair growth
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Solution
Probiotics are beneficial bacteria that improve gut health and aid in digestion.
Correct Answer:
B
— Improve gut health
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Q. What is the primary benefit of using probiotics? (2023)
A.
To cure diseases
B.
To enhance gut health
C.
To increase appetite
D.
To reduce weight
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Solution
Probiotics are beneficial bacteria that help enhance gut health and improve digestion.
Correct Answer:
B
— To enhance gut health
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Q. What is the primary cause of AIDS? (2020)
A.
Bacteria
B.
Virus
C.
Fungi
D.
Protozoa
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Solution
AIDS is caused by the Human Immunodeficiency Virus (HIV), which is a virus.
Correct Answer:
B
— Virus
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Q. What is the primary cause of biodiversity loss worldwide? (2020)
A.
Climate change
B.
Habitat destruction
C.
Pollution
D.
Overexploitation
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Solution
Habitat destruction is the primary cause of biodiversity loss, as it leads to the loss of species and ecosystems.
Correct Answer:
B
— Habitat destruction
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Q. What is the primary cause of tuberculosis? (2020)
A.
Bacteria
B.
Virus
C.
Fungi
D.
Protozoa
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Solution
Tuberculosis is primarily caused by the bacterium Mycobacterium tuberculosis.
Correct Answer:
A
— Bacteria
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Q. What is the primary characteristic of a K-selected species? (2023)
A.
High reproductive rate
B.
Short lifespan
C.
High parental care
D.
Rapid growth
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Solution
K-selected species typically exhibit high parental care and invest more resources in fewer offspring.
Correct Answer:
C
— High parental care
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Q. What is the primary characteristic of a redox reaction? (2023)
A.
Transfer of protons
B.
Transfer of electrons
C.
Change in temperature
D.
Change in pressure
Show solution
Solution
The primary characteristic of a redox reaction is the transfer of electrons between species.
Correct Answer:
B
— Transfer of electrons
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