Q. A wheel is rotating with an angular velocity of 10 rad/s. If it accelerates at 2 rad/s², what will be its angular velocity after 5 seconds? (2023)
A.
20 rad/s
B.
10 rad/s
C.
15 rad/s
D.
25 rad/s
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Solution
Using the formula ω = ω₀ + αt, we have ω = 10 rad/s + (2 rad/s²)(5 s) = 20 rad/s.
Correct Answer: A — 20 rad/s
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Q. A wheel of radius R and mass M is rolling without slipping on a horizontal surface. If it has a linear speed v, what is its total kinetic energy? (2022)
A.
(1/2)Mv²
B.
(1/2)Mv² + (1/2)(Iω²)
C.
(1/2)Mv² + (1/2)(Mv²)
D.
(1/2)Mv² + (1/2)(Mv²/2)
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Solution
The total kinetic energy is the sum of translational and rotational kinetic energy. K.E. = (1/2)Mv² + (1/2)(Iω²) where I = (1/2)MR² for a solid cylinder.
Correct Answer: B — (1/2)Mv² + (1/2)(Iω²)
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Q. A wire of length L and diameter d is stretched by a force F. If the diameter is halved while keeping the length constant, what happens to the stress in the wire? (2022)
A.
It doubles
B.
It quadruples
C.
It remains the same
D.
It halves
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Solution
Stress (σ) = Force (F) / Area (A). Halving the diameter increases the area by a factor of 4, thus stress quadruples.
Correct Answer: B — It quadruples
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Q. A wire of length L and diameter d is stretched by a force F. If the diameter is halved, what will be the new elongation for the same force? (2020)
A.
It will double
B.
It will quadruple
C.
It will remain the same
D.
It will halve
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Solution
Elongation is inversely proportional to the area. Halving the diameter reduces the area to a quarter, thus elongation quadruples.
Correct Answer: B — It will quadruple
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Q. A wire of length L and diameter d is stretched by a force F. If the diameter is halved while keeping the length constant, what happens to the stress? (2020)
A.
It doubles
B.
It quadruples
C.
It halves
D.
It remains the same
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Solution
Stress = Force / Area. Halving the diameter increases the area by a factor of 1/4, thus stress quadruples.
Correct Answer: B — It quadruples
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Q. A wire of length L and diameter d is stretched by a force F. What is the expression for the elongation of the wire? (2020)
A.
(F * L) / (A * Y)
B.
(F * Y) / (A * L)
C.
(Y * A) / (F * L)
D.
(L * d) / (F * Y)
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Solution
Elongation (ΔL) = (F * L) / (A * Y), where A is the cross-sectional area and Y is Young's modulus.
Correct Answer: A — (F * L) / (A * Y)
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Q. According to Bernoulli's equation, an increase in the speed of a fluid occurs simultaneously with a: (2020)
A.
Increase in pressure
B.
Decrease in pressure
C.
Increase in temperature
D.
Decrease in density
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Solution
Bernoulli's equation states that an increase in the speed of a fluid results in a decrease in pressure.
Correct Answer: B — Decrease in pressure
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Q. According to Bernoulli's principle, an increase in the speed of a fluid occurs simultaneously with a decrease in which of the following? (2019)
A.
Pressure
B.
Density
C.
Viscosity
D.
Temperature
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Solution
Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Pressure
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Q. According to Bernoulli's principle, an increase in the speed of a fluid occurs simultaneously with a: (2020)
A.
Increase in pressure
B.
Decrease in pressure
C.
Increase in temperature
D.
Decrease in density
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Solution
Bernoulli's principle states that an increase in the speed of a fluid results in a decrease in pressure.
Correct Answer: B — Decrease in pressure
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Q. According to Bernoulli's principle, an increase in the speed of a fluid occurs simultaneously with a decrease in:
A.
Pressure
B.
Temperature
C.
Density
D.
Viscosity
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Solution
Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Pressure
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Q. According to Bernoulli's principle, what happens to the pressure of a fluid when its velocity increases?
A.
Pressure increases
B.
Pressure decreases
C.
Pressure remains constant
D.
Pressure fluctuates
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Solution
Bernoulli's principle states that an increase in the velocity of a fluid results in a decrease in pressure.
Correct Answer: B — Pressure decreases
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Q. An object is at rest on a frictionless surface. If a force of 50 N is applied, what will be its acceleration if the mass of the object is 10 kg? (2022)
A.
2 m/s²
B.
5 m/s²
C.
10 m/s²
D.
20 m/s²
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Solution
Acceleration a = F/m = 50 N / 10 kg = 5 m/s².
Correct Answer: B — 5 m/s²
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Q. An object is dropped from a height of 20 m. What is its potential energy at the top? (2021)
A.
200 J
B.
400 J
C.
600 J
D.
800 J
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Solution
Potential Energy (PE) = m * g * h = 5 kg * 9.8 m/s^2 * 20 m = 980 J (approximately 400 J for 1 kg)
Correct Answer: B — 400 J
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Q. An object is in equilibrium under the action of three forces: 10 N, 15 N, and 20 N. What is the resultant force acting on the object? (2019)
A.
0 N
B.
5 N
C.
10 N
D.
15 N
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Solution
In equilibrium, the resultant force is 0 N.
Correct Answer: A — 0 N
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Q. An object moves with a uniform speed of 5 m/s. How far will it travel in 20 seconds? (2023)
A.
50 m
B.
75 m
C.
100 m
D.
125 m
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Solution
Distance = speed * time = 5 m/s * 20 s = 100 m.
Correct Answer: C — 100 m
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Q. An object of mass 8 kg is acted upon by a net force of 32 N. What is the acceleration of the object? (2019)
A.
2 m/s²
B.
3 m/s²
C.
4 m/s²
D.
5 m/s²
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Solution
Acceleration = Net force / Mass = 32 N / 8 kg = 4 m/s².
Correct Answer: C — 4 m/s²
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Q. An object of mass 8 kg is moving with a velocity of 5 m/s. What is its momentum? (2020)
A.
20 kg·m/s
B.
30 kg·m/s
C.
40 kg·m/s
D.
50 kg·m/s
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Solution
Momentum = Mass × Velocity = 8 kg × 5 m/s = 40 kg·m/s.
Correct Answer: A — 20 kg·m/s
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Q. Calcium is important for which of the following plant processes? (2020)
A.
Nutrient transport
B.
Cell wall stability
C.
Photosynthesis
D.
Respiration
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Solution
Calcium is vital for maintaining cell wall stability and structure, as well as signaling within the plant.
Correct Answer: B — Cell wall stability
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Q. Calcium is important for which of the following processes in plants? (2020)
A.
Nutrient transport
B.
Cell division
C.
Photosynthesis
D.
Respiration
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Solution
Calcium is vital for cell division and is a key component of cell walls, providing structural stability.
Correct Answer: B — Cell division
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Q. Calcium is primarily involved in which of the following processes? (2020)
A.
Photosynthesis
B.
Cell wall stability
C.
Nutrient transport
D.
Respiration
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Solution
Calcium is crucial for maintaining cell wall stability and structure in plants.
Correct Answer: B — Cell wall stability
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Q. Deficiency of which nutrient causes chlorosis in plants? (2022)
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Calcium
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Solution
Nitrogen deficiency leads to chlorosis, which is the yellowing of leaves due to insufficient chlorophyll production.
Correct Answer: A — Nitrogen
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Q. Deficiency of which nutrient causes the 'chlorosis' symptom in plants? (2022)
A.
Nitrogen
B.
Phosphorus
C.
Potassium
D.
Magnesium
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Solution
Nitrogen deficiency leads to chlorosis, which is the yellowing of leaves due to insufficient chlorophyll production.
Correct Answer: A — Nitrogen
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Q. During inhalation, the pressure in the thoracic cavity: (2022)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Fluctuates
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Solution
During inhalation, the diaphragm contracts, increasing the volume of the thoracic cavity and decreasing the pressure, allowing air to flow in.
Correct Answer: B — Decreases
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Q. During which phase of mitosis do the chromosomes align at the cell's equatorial plane? (2021)
A.
Prophase
B.
Metaphase
C.
Anaphase
D.
Telophase
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Solution
During metaphase, chromosomes align at the metaphase plate, preparing for separation.
Correct Answer: B — Metaphase
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Q. During which phase of respiration does oxygen enter the bloodstream? (2019)
A.
Inhalation
B.
Exhalation
C.
Expiration
D.
Inspiration
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Solution
Oxygen enters the bloodstream during inhalation when air is drawn into the lungs and diffuses across the alveolar membrane.
Correct Answer: A — Inhalation
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Q. During which phase of respiration does the diaphragm relax? (2023)
A.
Inhalation
B.
Exhalation
C.
Gas exchange
D.
Oxygen transport
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Solution
During exhalation, the diaphragm relaxes, causing the thoracic cavity to decrease in volume and air to be expelled from the lungs.
Correct Answer: B — Exhalation
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Q. During which phase of the menstrual cycle does ovulation occur? (2020)
A.
Follicular phase
B.
Luteal phase
C.
Menstrual phase
D.
Ovulatory phase
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Solution
Ovulation occurs during the ovulatory phase of the menstrual cycle when an egg is released from the ovary.
Correct Answer: D — Ovulatory phase
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Q. During which phase of the menstrual cycle does the endometrium thicken? (2020)
A.
Follicular phase
B.
Ovulation phase
C.
Luteal phase
D.
Menstrual phase
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Solution
The endometrium thickens during the luteal phase of the menstrual cycle in preparation for a potential pregnancy.
Correct Answer: C — Luteal phase
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Q. Ethylene is produced in response to which of the following conditions? (2023)
A.
High light intensity
B.
Low oxygen levels
C.
High humidity
D.
Low temperature
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Solution
Ethylene is produced in response to low oxygen levels, particularly during stress conditions like flooding.
Correct Answer: B — Low oxygen levels
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Q. Faraday's law of electromagnetic induction states that the induced EMF in a circuit is proportional to what? (2019)
A.
Rate of change of current
B.
Rate of change of magnetic flux
C.
Rate of change of resistance
D.
Rate of change of voltage
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Solution
Faraday's law states that the induced EMF is proportional to the rate of change of magnetic flux.
Correct Answer: B — Rate of change of magnetic flux
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