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 is lifted vertically 4 m against gravity. If the mass of the object is 10 kg, what is the work done against gravity? (2021)
A.
40 J
B.
80 J
C.
100 J
D.
200 J
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Solution
Work Done = m * g * h = 10 kg * 9.8 m/s² * 4 m = 392 J (approx. 400 J).
Correct Answer:
B
— 80 J
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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. During which stage of development does the embryo implant into the uterine wall? (2022)
A.
Fertilization
B.
Cleavage
C.
Gastrulation
D.
Blastocyst stage
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Solution
The embryo implants into the uterine wall during the blastocyst stage of development.
Correct Answer:
D
— Blastocyst stage
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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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Q. For a convex lens, if the object is at infinity, the image will be formed at: (2020)
A.
At the focus
B.
At the center of curvature
C.
At infinity
D.
At the optical center
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Solution
When the object is at infinity, the rays converge at the focus of the convex lens.
Correct Answer:
A
— At the focus
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Q. For a convex lens, if the object is at the focus, what type of image is formed? (2020)
A.
Real and inverted
B.
Virtual and erect
C.
No image
D.
Real and erect
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Solution
When the object is at the focus of a convex lens, the rays of light emerge parallel, resulting in no image being formed.
Correct Answer:
C
— No image
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Q. For a zero-order reaction, how does the concentration of reactants change over time? (2020)
A.
Linearly
B.
Exponentially
C.
Quadratically
D.
Logarithmically
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Solution
In a zero-order reaction, the concentration of reactants decreases linearly with time.
Correct Answer:
A
— Linearly
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Q. For the equilibrium 2A(g) ⇌ B(g) + C(g), if the volume of the container is decreased, what will happen to the equilibrium? (2020)
A.
Shift to the left
B.
Shift to the right
C.
No change
D.
Depends on temperature
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Solution
Decreasing the volume increases the pressure, and the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.
Correct Answer:
B
— Shift to the right
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Q. For the equilibrium reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume of the container? (2021)
A.
Shift to the left
B.
Shift to the right
C.
No effect
D.
Increase in temperature
Show solution
Solution
Decreasing the volume increases the pressure, and according to Le Chatelier's principle, the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.
Correct Answer:
B
— Shift to the right
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Q. For the equilibrium reaction A ⇌ B, if the concentration of B is increased, what will be the effect on the equilibrium? (2023)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in temperature
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Solution
Increasing the concentration of B will shift the equilibrium to the left to produce more A, according to Le Chatelier's principle.
Correct Answer:
B
— Shift to the left
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Q. For the equilibrium reaction: 2NO2(g) ⇌ N2O4(g), what is the effect of increasing the pressure? (2021)
A.
Shift to the left
B.
Shift to the right
C.
No effect
D.
Increase Kp
Show solution
Solution
Increasing the pressure will shift the equilibrium to the side with fewer moles of gas, which is the right side (N2O4) in this case.
Correct Answer:
A
— Shift to the left
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