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 'Joule' is a measure of which of the following? (2023)
A.
Force
B.
Energy
C.
Power
D.
Work
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Solution
Joule is the SI unit of energy, which is also equivalent to work done.
Correct Answer:
B
— Energy
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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 equivalent to 1 Joule is: (2023)
A.
1 kg·m²/s²
B.
1 N·m
C.
Both 1 kg·m²/s² and 1 N·m
D.
None of the above
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Solution
1 Joule is defined as 1 kg·m²/s² and also equals 1 N·m, hence both are correct.
Correct Answer:
C
— Both 1 kg·m²/s² and 1 N·m
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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 energy in the SI system is equivalent to which of the following? (2020)
A.
Joule
B.
Newton-meter
C.
Both A and B
D.
None of the above
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Solution
Energy is measured in Joules, and 1 Joule is defined as 1 Newton-meter, hence both A and B are correct.
Correct Answer:
C
— Both A and B
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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 power is defined as: (2023)
A.
Joule per second
B.
Newton per meter
C.
Watt per hour
D.
Kilowatt
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Solution
Power is defined as Joule per second (Watt).
Correct Answer:
A
— Joule per second
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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. The work done by an ideal gas during an isothermal expansion is given by which formula? (2023)
A.
W = PΔV
B.
W = nRT ln(Vf/Vi)
C.
W = ΔU
D.
W = 0
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Solution
The work done by an ideal gas during an isothermal expansion is given by W = nRT ln(Vf/Vi), where Vf and Vi are the final and initial volumes.
Correct Answer:
B
— W = nRT ln(Vf/Vi)
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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 distance is reduced to 0.5 m, how does the force between them change? (2022)
A.
It doubles
B.
It remains the same
C.
It quadruples
D.
It halves
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Solution
According to Coulomb's law, F ∝ 1/r². Reducing the distance to half increases the force by a factor of 4.
Correct Answer:
C
— It quadruples
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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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