Q. What hormone is primarily responsible for regulating blood glucose levels? (2020)
A.
Insulin
B.
Glucagon
C.
Cortisol
D.
Adrenaline
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Solution
Insulin is the hormone produced by the pancreas that lowers blood glucose levels by facilitating the uptake of glucose into cells.
Correct Answer: A — Insulin
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Q. What hormone is primarily responsible for regulating blood sugar levels? (2020)
A.
Insulin
B.
Glucagon
C.
Adrenaline
D.
Cortisol
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Solution
Insulin is the hormone produced by the pancreas that lowers blood sugar levels by facilitating the uptake of glucose into cells.
Correct Answer: A — Insulin
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Q. What is adaptive radiation? (1960)
A.
Rapid evolution of many species from a common ancestor
B.
Evolution of similar traits in unrelated species
C.
The extinction of a species
D.
The migration of species to new habitats
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Solution
Adaptive radiation is the rapid evolution of many species from a common ancestor, often occurring when species colonize new environments with diverse ecological niches.
Correct Answer: A — Rapid evolution of many species from a common ancestor
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Q. What is binomial nomenclature? (2021)
A.
A method of classifying organisms
B.
A two-part naming system
C.
A type of genetic mutation
D.
A method of reproduction
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Solution
Binomial nomenclature is a two-part naming system for organisms, consisting of the genus and species names.
Correct Answer: B — A two-part naming system
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Q. What is carrying capacity? (2021)
A.
The maximum number of individuals an environment can support
B.
The minimum number of individuals needed for a population to survive
C.
The average number of individuals in a population
D.
The number of species in a community
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Solution
Carrying capacity is the maximum number of individuals of a species that an environment can sustainably support.
Correct Answer: A — The maximum number of individuals an environment can support
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Q. What is genetic drift? (2015)
A.
Change in allele frequencies due to chance
B.
Natural selection acting on a population
C.
Migration of individuals into a population
D.
Mutation of genes
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Solution
Genetic drift refers to changes in allele frequencies in a population due to random sampling of organisms, which can lead to significant changes over time, especially in small populations.
Correct Answer: A — Change in allele frequencies due to chance
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Q. What is ovulation? (2023)
A.
Release of an egg from the ovary
B.
Fertilization of the egg
C.
Implantation of the embryo
D.
Menstruation
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Solution
Ovulation is the process of releasing an egg from the ovary, which is a key event in the female reproductive cycle.
Correct Answer: A — Release of an egg from the ovary
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Q. What is parthenogenesis? (2020)
A.
Development of an embryo from an unfertilized egg
B.
A form of asexual reproduction
C.
A type of sexual reproduction
D.
Both a and b
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Solution
Parthenogenesis is a form of asexual reproduction where an embryo develops from an unfertilized egg, and it is considered a type of asexual reproduction.
Correct Answer: D — Both a and b
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Q. What is the absolute error if the true value is 50 and the measured value is 48? (2022)
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Solution
Absolute error is calculated as the absolute difference between the true value and the measured value, which is |50 - 48| = 2.
Correct Answer: A — 2
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Q. What is the absolute error in a measurement of 50.0 cm if the true value is 48.0 cm? (2022)
A.
2.0 cm
B.
1.0 cm
C.
3.0 cm
D.
4.0 cm
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Solution
Absolute error = |Measured value - True value| = |50.0 cm - 48.0 cm| = 2.0 cm.
Correct Answer: A — 2.0 cm
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Q. What is the absolute error in a measurement of 50.0 cm if the true value is 52.0 cm? (2022)
A.
2.0 cm
B.
1.0 cm
C.
0.5 cm
D.
3.0 cm
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Solution
Absolute error = |Measured value - True value| = |50.0 cm - 52.0 cm| = 2.0 cm.
Correct Answer: A — 2.0 cm
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Q. What is the absolute error in a measurement? (2021)
A.
The difference between the measured value and the true value
B.
The average of all measurements
C.
The maximum value in a set of measurements
D.
The minimum value in a set of measurements
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Solution
Absolute error is defined as the difference between the measured value and the true value.
Correct Answer: A — The difference between the measured value and the true value
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Q. What is the acceleration due to gravity at the surface of the Earth? (2022)
A.
9.81 m/s²
B.
10 m/s²
C.
9.8 m/s²
D.
8.9 m/s²
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Solution
The standard acceleration due to gravity at the surface of the Earth is approximately 9.81 m/s².
Correct Answer: A — 9.81 m/s²
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Q. What is the acceleration due to gravity on the surface of the Earth? (2018)
A.
9.8 m/s²
B.
10 m/s²
C.
9.81 m/s²
D.
8.9 m/s²
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Solution
The standard acceleration due to gravity on the surface of the Earth is approximately 9.81 m/s².
Correct Answer: C — 9.81 m/s²
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Q. What is the angle of diffraction for the first minimum in a single-slit diffraction pattern if the slit width is 0.5 mm and the wavelength of light is 500 nm? (2023)
A.
30°
B.
60°
C.
45°
D.
15°
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Solution
The angle for the first minimum is given by sin θ = λ/a, where a is the slit width. Thus, sin θ = 500 nm / 0.5 mm = 0.001, leading to θ ≈ 30°.
Correct Answer: C — 45°
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Q. What is the angular momentum of a particle of mass 2 kg moving in a circle of radius 3 m with a speed of 4 m/s? (2021)
A.
24 kg·m²/s
B.
12 kg·m²/s
C.
6 kg·m²/s
D.
8 kg·m²/s
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Solution
Angular momentum L = mvr, where v is the tangential speed. L = 2 kg * 4 m/s * 3 m = 24 kg·m²/s.
Correct Answer: A — 24 kg·m²/s
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Q. What is the approximate value of gravitational acceleration on Earth? (2022)
A.
9.8 m/s²
B.
10 m/s²
C.
9.81 m/s²
D.
9.6 m/s²
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Solution
The approximate value of gravitational acceleration on Earth is 9.8 m/s².
Correct Answer: A — 9.8 m/s²
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Q. What is the atomic number of an element with 12 protons? (2020)
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Solution
The atomic number of an element is defined as the number of protons in its nucleus. Therefore, an element with 12 protons has an atomic number of 12.
Correct Answer: B — 12
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Q. What is the average duration of a human menstrual cycle? (2023)
A.
21 days
B.
28 days
C.
35 days
D.
14 days
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Solution
The average duration of a human menstrual cycle is approximately 28 days.
Correct Answer: B — 28 days
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Q. What is the average duration of a human pregnancy? (2023)
A.
28 weeks
B.
36 weeks
C.
40 weeks
D.
44 weeks
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Solution
The average duration of a human pregnancy is approximately 40 weeks.
Correct Answer: C — 40 weeks
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Q. What is the average lifespan of a red blood cell in the human body? (2020)
A.
10 days
B.
30 days
C.
120 days
D.
1 year
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Solution
Red blood cells typically have an average lifespan of about 120 days before they are removed from circulation by the spleen.
Correct Answer: C — 120 days
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Q. What is the average power consumed in an AC circuit with a power factor of 0.5 and an RMS voltage of 100 V with a current of 5 A? (2020)
A.
250 W
B.
500 W
C.
125 W
D.
1000 W
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Solution
Average power (P) is given by P = V_rms × I_rms × power factor. Thus, P = 100 V × 5 A × 0.5 = 250 W.
Correct Answer: A — 250 W
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Q. What is the average power consumed in an AC circuit with a power factor of 0.8 and a current of 5 A at 230 V? (2022)
A.
920 W
B.
920 VA
C.
1150 W
D.
1150 VA
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Solution
Average power (P) is given by P = V × I × PF. Here, P = 230 V × 5 A × 0.8 = 920 W.
Correct Answer: A — 920 W
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Q. What is the average power consumed in an AC circuit with a power factor of 1? (2019)
A.
Zero
B.
RMS voltage
C.
RMS current
D.
Maximum power
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Solution
When the power factor is 1, the average power consumed is maximum and is given by P = V_rms × I_rms.
Correct Answer: D — Maximum power
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Q. What is the average volume of blood in an adult human body? (2020)
A.
3-4 liters
B.
4-5 liters
C.
5-6 liters
D.
6-7 liters
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Solution
The average volume of blood in an adult human body is approximately 5 to 6 liters.
Correct Answer: C — 5-6 liters
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Q. What is the balanced equation for the redox reaction between Cr2O7^2- and Fe^2+ in acidic medium? (2020)
A.
Cr2O7^2- + 6Fe^2+ → 2Cr^3+ + 3Fe^3+
B.
Cr2O7^2- + 3Fe^2+ → 2Cr^3+ + 3Fe^3+
C.
Cr2O7^2- + 4Fe^2+ → 2Cr^3+ + 4Fe^3+
D.
Cr2O7^2- + 2Fe^2+ → 2Cr^3+ + Fe^3+
Show solution
Solution
The balanced equation in acidic medium is Cr2O7^2- + 6Fe^2+ → 2Cr^3+ + 3Fe^3+.
Correct Answer: A — Cr2O7^2- + 6Fe^2+ → 2Cr^3+ + 3Fe^3+
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Q. What is the base unit of mass in the SI system? (2019)
A.
Gram
B.
Kilogram
C.
Pound
D.
Ounce
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Solution
The base unit of mass in the SI system is the kilogram (kg).
Correct Answer: B — Kilogram
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Q. What is the base unit of time in the SI system? (2019)
A.
Minute
B.
Hour
C.
Second
D.
Day
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Solution
The base unit of time in the SI system is the second (s).
Correct Answer: C — Second
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Q. What is the basic structural and functional unit of an animal's body? (2020)
A.
Tissue
B.
Cell
C.
Organ
D.
Organ System
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Solution
The basic structural and functional unit of an animal's body is the cell.
Correct Answer: B — Cell
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Q. What is the basic structural and functional unit of life in animals? (2020)
A.
Tissue
B.
Cell
C.
Organ
D.
Organ System
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Solution
The basic structural and functional unit of life in animals is the cell.
Correct Answer: B — Cell
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