Q. What is the formula for calculating the induced EMF in a coil? (2023)
A.
E = -dΦ/dt
B.
E = R * I
C.
E = V * I
D.
E = L * di/dt
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Solution
The induced EMF in a coil is given by the formula E = -dΦ/dt, where Φ is the magnetic flux.
Correct Answer: A — E = -dΦ/dt
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Q. What is the formula for calculating the number of atoms in a face-centered cubic unit cell? (2022)
A.
N = 4
B.
N = 2
C.
N = 1
D.
N = 8
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Solution
In a face-centered cubic unit cell, there are 4 atoms (1/8 from each of the 8 corners and 1/2 from each of the 6 faces).
Correct Answer: A — N = 4
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Q. What is the formula for calculating the number of moles from mass and molar mass? (2023)
A.
moles = mass × molar mass
B.
moles = mass / molar mass
C.
moles = molar mass / mass
D.
moles = mass + molar mass
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Solution
The correct formula is moles = mass / molar mass.
Correct Answer: B — moles = mass / molar mass
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Q. What is the formula for calculating the number of moles from mass? (2023)
A.
moles = mass / molar mass
B.
moles = mass × molar mass
C.
moles = mass + molar mass
D.
moles = mass - molar mass
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Solution
The formula for calculating the number of moles is moles = mass / molar mass.
Correct Answer: A — moles = mass / molar mass
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Q. What is the formula for calculating the number of moles of solute in a solution? (2023)
A.
Molarity x Volume
B.
Molarity / Volume
C.
Volume / Molarity
D.
Moles x Volume
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Solution
Number of moles = Molarity x Volume (in liters).
Correct Answer: A — Molarity x Volume
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Q. What is the formula for calculating work done? (2023)
A.
W = Fd cos(θ)
B.
W = Fd sin(θ)
C.
W = F + d
D.
W = F/d
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Solution
The formula for work done (W) is W = Fd cos(θ), where F is the force, d is the displacement, and θ is the angle between the force and displacement.
Correct Answer: A — W = Fd cos(θ)
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Q. What is the formula for kinetic energy? (2023)
A.
KE = mv²
B.
KE = 1/2 mv²
C.
KE = mgh
D.
KE = Fd
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Solution
The formula for kinetic energy (KE) is KE = 1/2 mv², where m is mass and v is velocity.
Correct Answer: B — KE = 1/2 mv²
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Q. What is the formula for the inductive reactance (X_L) in an AC circuit? (2022)
A.
X_L = 2πfL
B.
X_L = R/L
C.
X_L = 1/(2πfC)
D.
X_L = V/I
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Solution
The formula for inductive reactance is X_L = 2πfL, where f is the frequency and L is the inductance.
Correct Answer: A — X_L = 2πfL
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Q. What is the formula for the magnetic field at the center of a circular loop of radius r carrying a current I? (2023)
A.
B = μ₀I/2r
B.
B = μ₀I/r
C.
B = μ₀I/4r
D.
B = μ₀I/πr
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Solution
The magnetic field (B) at the center of a circular loop is given by B = μ₀I/2r.
Correct Answer: A — B = μ₀I/2r
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Q. What is the freezing point depression of a solution containing 1 mole of NaCl in 1 kg of water? (2022)
A.
1.86 °C
B.
3.72 °C
C.
2.52 °C
D.
0.93 °C
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Solution
Freezing point depression = i * Kf * m = 2 * 1.86 * 1 = 3.72 °C (i = 2 for NaCl).
Correct Answer: A — 1.86 °C
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Q. What is the freezing point depression of a solution containing 1 mole of solute in 1 kg of water? (Kf for water = 1.86 °C kg/mol) (2020)
A.
1.86 °C
B.
3.72 °C
C.
0.93 °C
D.
2.78 °C
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Solution
Freezing point depression = Kf * m = 1.86 °C kg/mol * 1 mol/kg = 1.86 °C.
Correct Answer: A — 1.86 °C
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Q. What is the freezing point depression of a solution containing 3 moles of KCl in 1 kg of water? (Kf for water = 1.86 °C kg/mol) (2022)
A.
5.58 °C
B.
3.72 °C
C.
1.86 °C
D.
7.44 °C
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Solution
Freezing point depression = i * Kf * m = 3 * 1.86 * 3 = 5.58 °C (i = 2 for KCl).
Correct Answer: A — 5.58 °C
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Q. What is the frequency of a wave if its wavelength is 2 meters and its speed is 340 m/s? (2021)
A.
170 Hz
B.
340 Hz
C.
68 Hz
D.
85 Hz
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Solution
Frequency (f) can be calculated using the formula f = v/λ. Here, f = 340 m/s / 2 m = 170 Hz.
Correct Answer: A — 170 Hz
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Q. What is the frequency of a wave if its wavelength is 2 meters and the speed of the wave is 340 m/s? (2020)
A.
170 Hz
B.
340 Hz
C.
85 Hz
D.
420 Hz
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Solution
Frequency (f) can be calculated using the formula f = v/λ. Here, f = 340 m/s / 2 m = 170 Hz.
Correct Answer: A — 170 Hz
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Q. What is the function of a diode in a circuit? (2020)
A.
To store energy
B.
To amplify signals
C.
To allow current to flow in one direction
D.
To resist current flow
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Solution
A diode allows current to flow in one direction only, acting as a one-way valve for electric current.
Correct Answer: C — To allow current to flow in one direction
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Q. What is the function of a promoter in a gene? (2023)
A.
To enhance gene expression
B.
To initiate transcription
C.
To terminate transcription
D.
To bind to ribosomes
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Solution
A promoter is a DNA sequence that initiates transcription of a gene by providing a binding site for RNA polymerase.
Correct Answer: B — To initiate transcription
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Q. What is the function of a promoter in a recombinant DNA molecule? (2023)
A.
To initiate transcription
B.
To terminate transcription
C.
To enhance translation
D.
To degrade RNA
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Solution
A promoter is a DNA sequence that initiates transcription of a particular gene, allowing for gene expression.
Correct Answer: A — To initiate transcription
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Q. What is the function of a selectable marker in a cloning vector? (2023)
A.
To enhance gene expression
B.
To allow for the identification of successfully transformed cells
C.
To provide energy for the cell
D.
To stabilize the DNA
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Solution
Selectable markers are genes that confer resistance to antibiotics or other substances, allowing for the identification of cells that have successfully taken up the vector.
Correct Answer: B — To allow for the identification of successfully transformed cells
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Q. What is the function of a transistor in a circuit? (2021)
A.
Amplification
B.
Rectification
C.
Capacitance
D.
Inductance
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Solution
A transistor is primarily used for amplification of signals in electronic circuits.
Correct Answer: A — Amplification
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Q. What is the function of cartilage in the body? (2022)
A.
Support and flexibility
B.
Storage of fat
C.
Transmission of impulses
D.
Protection
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Solution
Cartilage provides support and flexibility in the body.
Correct Answer: A — Support and flexibility
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Q. What is the function of chloroplasts? (2023)
A.
Respiration
B.
Photosynthesis
C.
Digestion
D.
Reproduction
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Solution
Chloroplasts are responsible for photosynthesis, converting light energy into chemical energy in plants.
Correct Answer: B — Photosynthesis
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Q. What is the function of DNA polymerase? (2021)
A.
Synthesizes RNA
B.
Replicates DNA
C.
Repairs DNA
D.
Transcribes DNA
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Solution
DNA polymerase is an enzyme that synthesizes new strands of DNA during replication.
Correct Answer: B — Replicates DNA
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Q. What is the function of glucagon? (2019)
A.
Lower blood sugar
B.
Increase blood sugar
C.
Regulate metabolism
D.
Stimulate growth
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Solution
Glucagon is a hormone produced by the pancreas that raises blood sugar levels by promoting the conversion of glycogen to glucose in the liver.
Correct Answer: B — Increase blood sugar
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Q. What is the function of lysosomes? (2018)
A.
Energy production
B.
Digestion of macromolecules
C.
Protein synthesis
D.
Cell division
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Solution
Lysosomes contain digestive enzymes that break down macromolecules, old cell parts, and microorganisms.
Correct Answer: B — Digestion of macromolecules
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Q. What is the function of NADP+ in photosynthesis? (2019)
A.
Energy storage
B.
Electron carrier
C.
Carbon fixation
D.
Light absorption
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Solution
NADP+ acts as an electron carrier, becoming NADPH during the light-dependent reactions.
Correct Answer: B — Electron carrier
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Q. What is the function of nervous tissue? (2023)
A.
Support
B.
Movement
C.
Transmission of impulses
D.
Protection
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Solution
The function of nervous tissue is the transmission of impulses.
Correct Answer: C — Transmission of impulses
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Q. What is the function of oxytocin in the human body? (2023)
A.
Stimulate uterine contractions
B.
Regulate metabolism
C.
Increase blood sugar
D.
Promote sleep
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Solution
Oxytocin is a hormone that stimulates uterine contractions during childbirth and is also involved in social bonding.
Correct Answer: A — Stimulate uterine contractions
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Q. What is the function of parathyroid hormone? (2022)
A.
Increase calcium levels in the blood
B.
Decrease calcium levels in the blood
C.
Regulate blood sugar
D.
Stimulate growth
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Solution
Parathyroid hormone increases calcium levels in the blood by promoting the release of calcium from bones and increasing absorption in the intestines.
Correct Answer: A — Increase calcium levels in the blood
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Q. What is the function of petals in a flower? (2020)
A.
Support the flower
B.
Attract pollinators
C.
Produce ovules
D.
Store nutrients
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Solution
Petals serve to attract pollinators with their color and scent.
Correct Answer: B — Attract pollinators
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Q. What is the function of phosphorus in plants? (2021)
A.
Energy transfer
B.
Water absorption
C.
Cell wall formation
D.
Photosynthesis
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Solution
Phosphorus is crucial for energy transfer in plants, particularly in the form of ATP (adenosine triphosphate).
Correct Answer: A — Energy transfer
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