Q. What is the Poisson's ratio for a material if a longitudinal strain of 0.02 results in a lateral strain of 0.008? (2022)
A.
0.4
B.
0.5
C.
0.6
D.
0.7
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Solution
Poisson's ratio (ν) = -lateral strain / longitudinal strain = -0.008 / 0.02 = 0.4.
Correct Answer: A — 0.4
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Q. What is the Poisson's ratio for a material that experiences a lateral strain of 0.02 when subjected to a longitudinal strain of 0.01? (2023)
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Solution
Poisson's ratio (ν) = Lateral strain / Longitudinal strain = 0.02 / 0.01 = 2.
Correct Answer: A — 0.5
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Q. What is the Poisson's ratio for a material that experiences a lateral strain of 0.005 when subjected to a longitudinal strain of 0.01? (2021)
A.
0.5
B.
1
C.
0.25
D.
0.75
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Solution
Poisson's ratio (ν) = -lateral strain / longitudinal strain = -0.005 / 0.01 = 0.5.
Correct Answer: A — 0.5
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Q. What is the potential difference between two points in an electric field if the electric field strength is 50 N/C and the distance between the points is 0.4 m? (2023)
A.
20 V
B.
10 V
C.
5 V
D.
2 V
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Solution
Potential difference V = E * d = 50 N/C * 0.4 m = 20 V.
Correct Answer: A — 20 V
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Q. What is the potential difference between two points in an electric field of 400 N/C separated by 0.5 m? (2022)
A.
200 V
B.
100 V
C.
50 V
D.
80 V
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Solution
Potential difference V = E * d = 400 N/C * 0.5 m = 200 V.
Correct Answer: A — 200 V
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Q. What is the potential energy of a mass in simple harmonic motion at maximum displacement? (2023)
A.
Zero
B.
Maximum
C.
Minimum
D.
Depends on mass
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Solution
At maximum displacement, potential energy is maximum and kinetic energy is zero.
Correct Answer: B — Maximum
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Q. What is the potential energy of a system of two charges +3 μC and +4 μC separated by 0.2 m? (2023)
A.
-54 J
B.
54 J
C.
0 J
D.
27 J
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Solution
Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.2 m = 54 J.
Correct Answer: B — 54 J
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Q. What is the potential energy of a system of two charges +3 µC and +4 µC separated by 0.3 m? (2023)
A.
-0.12 J
B.
0.12 J
C.
0.36 J
D.
0.24 J
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Solution
Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.3 m = 0.36 J.
Correct Answer: C — 0.36 J
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Q. What is the potential energy of an object of mass 2 kg at a height of 10 m? (g = 9.8 m/s²) (2022)
A.
196 J
B.
98 J
C.
20 J
D.
10 J
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Solution
Potential energy (PE) is calculated using the formula PE = mgh. Here, PE = 2 kg × 9.8 m/s² × 10 m = 196 J.
Correct Answer: A — 196 J
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Q. What is the potential energy of two charges +3 μC and +4 μC separated by 0.2 m? (2023)
A.
-54 J
B.
54 J
C.
0.54 J
D.
5.4 J
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Solution
Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.2 m = 54 J.
Correct Answer: B — 54 J
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Q. What is the potential energy stored in a capacitor of capacitance C charged to a voltage V? (2021)
A.
CV
B.
1/2 CV^2
C.
1/2 QV
D.
QV
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Solution
The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2.
Correct Answer: B — 1/2 CV^2
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Q. What is the potential energy stored in a capacitor? (2022)
A.
1/2 CV²
B.
CV
C.
1/2 QV
D.
QV
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Solution
The potential energy (U) stored in a capacitor is given by the formula U = 1/2 CV², where C is the capacitance and V is the voltage across the capacitor.
Correct Answer: A — 1/2 CV²
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Q. What is the power consumed by a 10Ω resistor when a current of 3A flows through it? (2021)
A.
90W
B.
30W
C.
60W
D.
45W
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Solution
Power P = I^2 * R = (3A)^2 * 10Ω = 9 * 10 = 90W.
Correct Answer: A — 90W
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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 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 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
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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
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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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Q. What is the primary characteristic of alkaline earth metals? (2020)
A.
They are highly reactive
B.
They have a +2 oxidation state
C.
They are gases at room temperature
D.
They form covalent bonds
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Solution
Alkaline earth metals typically have a +2 oxidation state due to the loss of two electrons.
Correct Answer: B — They have a +2 oxidation state
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