Undergraduate
Q. What is the formula for the complex formed between iron(III) and thiocyanate? (2021)
A.
[Fe(SCN)3]
B.
[Fe(SCN)2]
C.
[Fe(SCN)6]3+
D.
[Fe(SCN)4]2-
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Solution
The complex formed is [Fe(SCN)3] as iron(III) can bond with three thiocyanate ions.
Correct Answer: A — [Fe(SCN)3]
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Q. What is the formula for the resonant frequency of an RLC circuit? (2021)
A.
f = 1/(2π√(LC))
B.
f = R/(2πL)
C.
f = 1/(2πRC)
D.
f = 2π√(LC)
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Solution
The resonant frequency f of an RLC circuit is given by f = 1/(2π√(LC)).
Correct Answer: A — f = 1/(2π√(LC))
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Q. What is the freezing point depression of a solution containing 1 mol of NaCl in 1 kg of water? (Kf for water = 1.86 °C kg/mol) (2023)
A.
1.86 °C
B.
3.72 °C
C.
2.00 °C
D.
0.93 °C
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Solution
Freezing point depression (ΔTf) = i * Kf * m. For NaCl, i = 2 (dissociates into Na+ and Cl-). m = 1 mol/kg. ΔTf = 2 * 1.86 °C kg/mol * 1 = 3.72 °C.
Correct Answer: B — 3.72 °C
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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 frequency of a pendulum that completes 30 oscillations in 60 seconds? (2017)
A.
0.5 Hz
B.
1 Hz
C.
2 Hz
D.
3 Hz
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Solution
Frequency f = number of oscillations / time = 30 / 60 = 0.5 Hz.
Correct Answer: B — 1 Hz
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Q. What is the frequency of a sound wave with a period of 0.01 seconds? (2014)
A.
100 Hz
B.
200 Hz
C.
50 Hz
D.
10 Hz
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Solution
Frequency = 1/Period = 1/0.01 s = 100 Hz.
Correct Answer: A — 100 Hz
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Q. What is the frequency of a tuning fork that vibrates 256 times in 2 seconds? (2019)
A.
128 Hz
B.
256 Hz
C.
512 Hz
D.
64 Hz
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Solution
Frequency (f) = Number of vibrations / Time = 256 / 2 = 128 Hz.
Correct Answer: A — 128 Hz
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Q. What is the frequency of a wave with a period of 0.01 s? (2020)
A.
100 Hz
B.
50 Hz
C.
200 Hz
D.
10 Hz
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Solution
Frequency f = 1/T = 1/0.01 s = 100 Hz.
Correct Answer: A — 100 Hz
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Q. What is the frequency of a wave with a period of 0.1 s? (2020)
A.
10 Hz
B.
5 Hz
C.
20 Hz
D.
15 Hz
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Solution
Frequency f = 1/T = 1/0.1 s = 10 Hz.
Correct Answer: A — 10 Hz
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Q. What is the frequency of a wave with a period of 0.2 seconds?
A.
5 Hz
B.
10 Hz
C.
20 Hz
D.
50 Hz
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Solution
Frequency (f) is the reciprocal of the period (T). Therefore, f = 1/T = 1/0.2 s = 5 Hz.
Correct Answer: B — 10 Hz
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Q. What is the frequency of a wave with a period of 0.5 seconds? (2019)
A.
2 Hz
B.
1 Hz
C.
0.5 Hz
D.
4 Hz
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Solution
Frequency (f) = 1/Period (T) = 1/0.5 s = 2 Hz.
Correct Answer: A — 2 Hz
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Q. What is the frequency of a wave with a speed of 300 m/s and a wavelength of 3 m? (2023)
A.
100 Hz
B.
150 Hz
C.
200 Hz
D.
250 Hz
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Solution
Frequency (f) = speed (v) / wavelength (λ) = 300 m/s / 3 m = 100 Hz.
Correct Answer: B — 150 Hz
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Q. What is the frequency of a wave with a wavelength of 2 m and a speed of 340 m/s?
A.
170 Hz
B.
340 Hz
C.
85 Hz
D.
420 Hz
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Solution
Frequency (f) is given by the formula f = speed / wavelength. 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 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 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 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 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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Q. What is the function of ribosomes in a cell? (2023)
A.
DNA replication
B.
Protein synthesis
C.
Energy production
D.
Cell division
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Solution
Ribosomes are the cellular structures responsible for protein synthesis.
Correct Answer: B — Protein synthesis
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Q. What is the function of sclerenchyma tissue? (2022)
A.
Storage
B.
Photosynthesis
C.
Support and protection
D.
Transport
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Solution
Sclerenchyma tissue provides support and protection to the plant due to its thick, lignified cell walls.
Correct Answer: C — Support and protection
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Q. What is the function of stomata in plants? (2019)
A.
Water absorption
B.
Gas exchange
C.
Nutrient uptake
D.
Photosynthesis
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Solution
Stomata are small openings on leaves that facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer: B — Gas exchange
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Q. What is the function of the autonomic nervous system? (2023)
A.
To control voluntary muscle movements
B.
To regulate involuntary bodily functions
C.
To process sensory information
D.
To coordinate reflex actions
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Solution
The autonomic nervous system regulates involuntary bodily functions such as heart rate and digestion.
Correct Answer: B — To regulate involuntary bodily functions
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Q. What is the function of the cell membrane? (2023)
A.
Energy production
B.
Transport of substances
C.
Protein synthesis
D.
DNA storage
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Solution
The cell membrane regulates the transport of substances in and out of the cell.
Correct Answer: B — Transport of substances
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Q. What is the function of the cilia in the respiratory tract? (2021)
A.
Gas exchange
B.
Mucus secretion
C.
Movement of air
D.
Clearing debris and pathogens
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Solution
Cilia in the respiratory tract help to clear debris and pathogens by moving mucus upwards towards the throat.
Correct Answer: D — Clearing debris and pathogens
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Q. What is the function of the corpus luteum? (2021)
A.
Produces estrogen
B.
Produces progesterone
C.
Produces testosterone
D.
Produces LH
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Solution
The corpus luteum primarily produces progesterone, which is essential for maintaining the uterine lining during early pregnancy.
Correct Answer: B — Produces progesterone
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Q. What is the function of the hormone oxytocin? (2019)
A.
Stimulate uterine contractions
B.
Regulate metabolism
C.
Control blood sugar
D.
Increase heart rate
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Solution
Oxytocin is involved in childbirth by stimulating uterine contractions and is also associated with social bonding.
Correct Answer: A — Stimulate uterine contractions
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Q. What is the function of the nucleus in a cell? (2023)
A.
Energy production
B.
Storage of nutrients
C.
Control center of the cell
D.
Waste removal
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Solution
The nucleus serves as the control center of the cell, housing the cell's genetic material.
Correct Answer: C — Control center of the cell
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