Q. The term 'adsorption' refers to: (2022)
A.
The process of a substance being taken up by a liquid.
B.
The accumulation of molecules on a surface.
C.
The mixing of two liquids.
D.
The dissolution of a solid in a liquid.
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Solution
Adsorption is the process where molecules accumulate on the surface of a solid or liquid.
Correct Answer: B — The accumulation of molecules on a surface.
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Q. The theory that organisms can pass on traits acquired during their lifetime is known as?
A.
Natural Selection
B.
Lamarckism
C.
Mendelian Genetics
D.
Darwinism
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Solution
Lamarckism is the theory that organisms can pass on traits acquired during their lifetime, which has been largely discredited in favor of Darwinian evolution.
Correct Answer: B — Lamarckism
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Q. The uncertainty in a measurement is defined as: (2022)
A.
The difference between the maximum and minimum values
B.
The average of the measurements
C.
The standard deviation
D.
The range of values
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Solution
Uncertainty is often defined as the range of values within which the true value lies.
Correct Answer: A — The difference between the maximum and minimum values
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Q. The uncertainty principle is associated with which of the following scientists? (2023)
A.
Bohr
B.
Heisenberg
C.
Schrodinger
D.
Planck
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Solution
The uncertainty principle is a fundamental concept in quantum mechanics formulated by Werner Heisenberg.
Correct Answer: B — Heisenberg
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Q. The unit cell of a diamond structure is best described as which of the following? (2020)
A.
Simple cubic
B.
Face-centered cubic
C.
Body-centered cubic
D.
Hexagonal
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Solution
The diamond structure can be described as a face-centered cubic (FCC) lattice with a basis of two carbon atoms.
Correct Answer: B — Face-centered cubic
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Q. The unit of electric charge in the SI system is: (2022)
A.
Coulomb
B.
Ampere
C.
Volt
D.
Ohm
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Solution
Coulomb (C) is the SI unit of electric charge.
Correct Answer: A — Coulomb
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Q. The unit of energy in the CGS system is: (2020)
A.
Joule
B.
Erg
C.
Calorie
D.
Watt
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Solution
In the CGS system, the unit of energy is Erg, where 1 Joule = 10^7 Ergs.
Correct Answer: B — Erg
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Q. The unit of force in the SI system is derived from which of the following? (2023)
A.
Mass and length
B.
Mass, length, and time
C.
Length and time
D.
Mass and time
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Solution
The unit of force (Newton) is derived from mass, length, and time: kg·m/s².
Correct Answer: B — Mass, length, and time
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Q. The unit of force in the SI system is: (2023)
A.
Joule
B.
Newton
C.
Pascal
D.
Watt
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Solution
The SI unit of force is the Newton (N).
Correct Answer: B — Newton
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Q. The unit of power in the SI system is defined as: (2023)
A.
Joule per second
B.
Newton per meter
C.
Watt per hour
D.
Kilogram meter per second
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Solution
The SI unit of power is defined as Joule per second (Watt).
Correct Answer: A — Joule per second
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Q. The unit of power in the SI system is: (2023)
A.
Joule
B.
Watt
C.
Newton
D.
Pascal
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Solution
The SI unit of power is the Watt (W).
Correct Answer: B — Watt
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Q. The unit of work is defined as one joule. What is one joule equivalent to? (2023)
A.
One newton meter
B.
One kilogram meter per second
C.
One watt second
D.
One pascal meter
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Solution
One joule is defined as one newton meter (N·m).
Correct Answer: A — One newton meter
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Q. The viscosity of a fluid is a measure of its: (2022)
A.
Density
B.
Pressure
C.
Resistance to flow
D.
Temperature
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Solution
Viscosity measures a fluid's resistance to flow; higher viscosity means the fluid flows less easily.
Correct Answer: C — Resistance to flow
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Q. Two capacitors of capacitance 2μF and 3μF are connected in series. What is the equivalent capacitance? (2019)
A.
1.2μF
B.
1.5μF
C.
0.86μF
D.
5μF
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Solution
For capacitors in series, 1/C_eq = 1/C1 + 1/C2. Thus, 1/C_eq = 1/2 + 1/3 = 5/6, giving C_eq = 6/5 = 1.2μF.
Correct Answer: C — 0.86μF
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Q. Two identical charges are placed 1 m apart. If the magnitude of each charge is doubled, what happens to the force between them? (2022)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
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Solution
According to Coulomb's law, F ∝ q1 * q2. If both charges are doubled, the force becomes 4 times the original force.
Correct Answer: C — It quadruples
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Q. Viruses are classified as: (2020)
A.
Living organisms
B.
Non-living entities
C.
Prokaryotes
D.
Eukaryotes
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Solution
Viruses are considered non-living entities as they cannot carry out metabolic processes independently.
Correct Answer: B — Non-living entities
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Q. What are the roots of the equation 3x² - 12x + 12 = 0? (2019)
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Solution
Dividing the equation by 3 gives x² - 4x + 4 = 0, which factors to (x - 2)² = 0, hence the root is 2.
Correct Answer: B — 4
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Q. What are the roots of the equation x² - 2x - 8 = 0? (2022)
A.
-2 and 4
B.
2 and -4
C.
4 and -2
D.
0 and 8
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Solution
Factoring gives (x - 4)(x + 2) = 0, hence the roots are 4 and -2.
Correct Answer: C — 4 and -2
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Q. What are the roots of the equation x² - 5x + 6 = 0? (2021)
A.
1 and 6
B.
2 and 3
C.
3 and 2
D.
0 and 5
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Solution
The roots can be found using the factorization method: (x - 2)(x - 3) = 0, hence the roots are 2 and 3.
Correct Answer: B — 2 and 3
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Q. What does the term 'enthalpy' (H) represent? (2019)
A.
Internal energy plus pressure-volume work
B.
Total energy of the system
C.
Heat content at constant pressure
D.
All of the above
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Solution
Enthalpy (H) represents the total heat content of a system at constant pressure and is defined as internal energy plus pressure-volume work.
Correct Answer: D — All of the above
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Q. What does the term 'enthalpy' refer to? (2020)
A.
Internal energy plus pressure times volume
B.
Heat content of a system at constant pressure
C.
Total energy of a system
D.
Work done by the system
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Solution
Enthalpy refers to the heat content of a system at constant pressure, defined as internal energy plus pressure times volume.
Correct Answer: B — Heat content of a system at constant pressure
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Q. What effect do gibberellins have on seed germination? (2020)
A.
Inhibit germination
B.
Promote germination
C.
No effect
D.
Delay germination
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Solution
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
Correct Answer: B — Promote germination
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Q. What effect does increasing temperature have on the rate of a chemical reaction? (2023)
A.
Decreases the rate
B.
Increases the rate
C.
No effect
D.
Depends on the reaction
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Solution
Increasing temperature generally increases the rate of a chemical reaction due to higher kinetic energy.
Correct Answer: B — Increases the rate
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Q. What enzyme is responsible for the digestion of carbohydrates in the mouth? (2020)
A.
Pepsin
B.
Amylase
C.
Lipase
D.
Trypsin
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Solution
Salivary amylase is the enzyme that begins the digestion of carbohydrates in the mouth.
Correct Answer: B — Amylase
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Q. What happens during telophase of mitosis? (2019)
A.
Chromosomes condense
B.
Nuclear envelope re-forms
C.
Spindle fibers disappear
D.
Both B and C
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Solution
During telophase, the nuclear envelope re-forms around the separated chromosomes, and spindle fibers disappear.
Correct Answer: D — Both B and C
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Q. What happens to the buoyant force when the density of the fluid increases? (2022)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
The buoyant force increases with the density of the fluid, as it is directly proportional to the fluid's density.
Correct Answer: B — It increases
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Q. What happens to the capacitance of a capacitor if a dielectric material is inserted? (2021)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
Inserting a dielectric material between the plates of a capacitor increases its capacitance due to the material's ability to reduce the electric field.
Correct Answer: A — It increases
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Q. What happens to the capacitance of a capacitor if a dielectric material is inserted between its plates? (2022)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
Inserting a dielectric material increases the capacitance of the capacitor by a factor equal to the dielectric constant of the material.
Correct Answer: B — It increases
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Q. What happens to the capacitance of a capacitor if a dielectric material is introduced between its plates? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The capacitance increases when a dielectric material is introduced, as it reduces the electric field between the plates.
Correct Answer: A — Increases
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Q. What happens to the capacitance of a parallel plate capacitor if the distance between the plates is increased? (2020)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
The capacitance (C) of a parallel plate capacitor is inversely proportional to the distance (d) between the plates. If d increases, C decreases.
Correct Answer: B — It decreases
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