Q. What is the basic structural and functional unit of life? (2020)
A.
Tissue
B.
Organ
C.
Cell
D.
Organism
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Solution
The cell is the basic structural and functional unit of life, as it is the smallest unit that can carry out all life processes.
Correct Answer: C — Cell
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Q. What is the basic structural unit of lipids? (2020)
A.
Amino acids
B.
Nucleotides
C.
Fatty acids
D.
Monosaccharides
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Solution
Fatty acids are the basic structural units of lipids.
Correct Answer: C — Fatty acids
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Q. What is the basic unit of classification in biology? (2020)
A.
Species
B.
Genus
C.
Family
D.
Order
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Solution
The basic unit of classification in biology is the species, which is defined as a group of organisms that can interbreed and produce fertile offspring.
Correct Answer: A — Species
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Q. What is the basic unit of heredity? (2020)
A.
Gene
B.
Chromosome
C.
DNA
D.
RNA
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Solution
A gene is the basic unit of heredity, responsible for the transmission of traits from parents to offspring.
Correct Answer: A — Gene
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Q. What is the basic unit of life? (2020)
A.
Atom
B.
Molecule
C.
Cell
D.
Tissue
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Solution
The cell is the basic unit of life as it is the smallest structural and functional unit of an organism.
Correct Answer: C — Cell
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Q. What is the boiling point elevation for a solution with 0.5 moles of a non-volatile solute in 1 kg of water? (Kb for water = 0.512 °C kg/mol) (2022)
A.
0.256 °C
B.
0.512 °C
C.
1.024 °C
D.
0.128 °C
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Solution
Boiling point elevation (ΔTb) = Kb * m = 0.512 °C kg/mol * 0.5 mol/kg = 0.256 °C.
Correct Answer: A — 0.256 °C
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Q. What is the boiling point trend among amines? (2020)
A.
Amines have lower boiling points than alkanes
B.
Amines have higher boiling points than alcohols
C.
Boiling points increase with molecular weight
D.
All of the above
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Solution
All of the above statements are true regarding the boiling point trends of amines.
Correct Answer: D — All of the above
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Q. What is the bond angle in the water molecule (H2O)? (2023)
A.
90 degrees
B.
104.5 degrees
C.
120 degrees
D.
180 degrees
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Solution
The bond angle in a water molecule is approximately 104.5 degrees due to the bent shape caused by lone pairs on oxygen.
Correct Answer: B — 104.5 degrees
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Q. What is the bond angle in water (H2O) due to the presence of hydrogen? (2023)
A.
90 degrees
B.
104.5 degrees
C.
120 degrees
D.
180 degrees
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Solution
The bond angle in water is approximately 104.5 degrees due to the bent shape of the molecule.
Correct Answer: B — 104.5 degrees
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Q. What is the bulk modulus of a material if a pressure increase of 1000 kPa causes a volume decrease of 0.01 m³ in a 1 m³ sample? (2022)
A.
10000 kPa
B.
1000 kPa
C.
100 kPa
D.
100 kPa
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Solution
Bulk modulus (K) = -ΔP / (ΔV/V) = 1000 kPa / (0.01 m³ / 1 m³) = 100000 kPa = 10000 kPa.
Correct Answer: A — 10000 kPa
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Q. What is the bulk modulus of a material if a pressure increase of 1000 kPa results in a volume decrease of 0.01 m³ for a volume of 1 m³? (2022)
A.
10000 kPa
B.
1000 kPa
C.
100 kPa
D.
100000 kPa
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Solution
Bulk modulus (K) = -ΔP / (ΔV/V) = 1000 kPa / (0.01 m³ / 1 m³) = 100000 kPa.
Correct Answer: A — 10000 kPa
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Q. What is the bulk modulus of a material if a pressure increase of 1000 kPa results in a volume decrease of 0.5%? (2022)
A.
200000 kPa
B.
500000 kPa
C.
1000000 kPa
D.
250000 kPa
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Solution
Bulk modulus (K) = -ΔP / (ΔV/V) = 1000 kPa / 0.005 = 200000 kPa.
Correct Answer: B — 500000 kPa
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Q. What is the bulk modulus of a material if a pressure increase of 50 MPa results in a volume decrease of 0.02 m³ for a volume of 1 m³? (2022)
A.
2500 MPa
B.
500 MPa
C.
1000 MPa
D.
2000 MPa
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Solution
Bulk modulus (K) = -ΔP / (ΔV/V) = 50 MPa / (0.02 m³ / 1 m³) = 2500 MPa.
Correct Answer: A — 2500 MPa
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Q. What is the bulk modulus of a material if a pressure increase of 50 MPa results in a volume decrease of 0.002 m³ for a volume of 1 m³? (2022)
A.
25 GPa
B.
50 GPa
C.
100 GPa
D.
200 GPa
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Solution
Bulk modulus (K) = -ΔP / (ΔV/V) = -50 MPa / (-0.002 m³ / 1 m³) = 25000 MPa = 25 GPa.
Correct Answer: B — 50 GPa
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Q. What is the capacitance of a spherical capacitor with inner radius a and outer radius b? (2023)
A.
4πε₀ab/(b-a)
B.
4πε₀/(1/a - 1/b)
C.
4πε₀/(a+b)
D.
4πε₀/(b-a)
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Solution
The capacitance of a spherical capacitor is given by C = 4πε₀ab/(b-a).
Correct Answer: A — 4πε₀ab/(b-a)
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Q. What is the change in internal energy (ΔU) for an ideal gas during an isothermal process? (2021)
A.
ΔU = 0
B.
ΔU = nRT
C.
ΔU = -nRT
D.
ΔU = PV
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Solution
In an isothermal process for an ideal gas, the temperature remains constant, which means the internal energy does not change. Therefore, ΔU = 0.
Correct Answer: A — ΔU = 0
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Q. What is the change in internal energy (ΔU) for an ideal gas undergoing an isothermal process? (2021)
A.
ΔU = 0
B.
ΔU = Q
C.
ΔU = W
D.
ΔU = Q + W
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Solution
In an isothermal process for an ideal gas, the temperature remains constant, which means the internal energy does not change. Therefore, ΔU = 0.
Correct Answer: A — ΔU = 0
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Q. What is the change in internal energy (ΔU) for an isothermal process for an ideal gas? (2021)
A.
ΔU = 0
B.
ΔU = nRT
C.
ΔU = -nRT
D.
ΔU = PV
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Solution
In an isothermal process for an ideal gas, the temperature remains constant, which means the internal energy does not change. Therefore, ΔU = 0.
Correct Answer: A — ΔU = 0
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Q. What is the change in internal energy (ΔU) for an isothermal process of an ideal gas? (2021)
A.
ΔU = 0
B.
ΔU = nRT
C.
ΔU = -nRT
D.
ΔU = PV
Show solution
Solution
In an isothermal process for an ideal gas, the temperature remains constant, which means the internal energy does not change. Therefore, ΔU = 0.
Correct Answer: A — ΔU = 0
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Q. What is the change in oxidation state of carbon in the reaction C6H12O6 → 2C2H5OH? (2023)
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Solution
In the conversion of glucose to ethanol, the oxidation state of carbon decreases, indicating a reduction of -1.
Correct Answer: C — -1
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Q. What is the change in oxidation state of manganese in the reaction MnO4- + 8H+ + 5e- → Mn2+ + 4H2O? (2023)
A.
+7 to +2
B.
+2 to +7
C.
0 to +2
D.
+4 to +2
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Solution
Manganese changes from +7 in MnO4- to +2 in Mn2+, indicating a reduction.
Correct Answer: A — +7 to +2
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Q. What is the charge of a neutron? (2022)
A.
Positive
B.
Negative
C.
Neutral
D.
Depends on the isotope
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Solution
A neutron has no charge; it is electrically neutral.
Correct Answer: C — Neutral
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Q. What is the charge of a proton? (2023)
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Solution
A proton carries a positive charge of +1 elementary charge.
Correct Answer: C — +1
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Q. What is the charge of one coulomb equivalent to in terms of electric current and time? (2022)
A.
1 A for 1 s
B.
1 A for 2 s
C.
2 A for 1 s
D.
0.5 A for 1 s
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Solution
1 coulomb is the charge that passes through a conductor when a current of 1 ampere flows for 1 second.
Correct Answer: A — 1 A for 1 s
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Q. What is the charge of one coulomb equivalent to in terms of electrons? (2022)
A.
6.25 x 10^18 electrons
B.
1.6 x 10^-19 electrons
C.
3.2 x 10^-19 electrons
D.
1.0 x 10^18 electrons
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Solution
One coulomb is equivalent to approximately 6.25 x 10^18 electrons.
Correct Answer: A — 6.25 x 10^18 electrons
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Q. What is the charge of one coulomb in terms of the number of electrons? (2023)
A.
6.25 x 10^18 electrons
B.
1.6 x 10^-19 electrons
C.
3.2 x 10^-19 electrons
D.
1.0 x 10^18 electrons
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Solution
One coulomb is equivalent to approximately 6.25 x 10^18 electrons.
Correct Answer: A — 6.25 x 10^18 electrons
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Q. What is the chemical formula for the compound formed between strontium and chlorine? (2019)
A.
SrCl
B.
SrCl2
C.
Sr2Cl
D.
Sr2Cl3
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Solution
Strontium forms a compound with chlorine as SrCl2, where strontium has a +2 charge and chlorine has a -1 charge.
Correct Answer: B — SrCl2
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Q. What is the color of potassium permanganate (KMnO4)? (2021)
A.
Colorless
B.
Green
C.
Purple
D.
Yellow
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Solution
Potassium permanganate (KMnO4) is known for its deep purple color.
Correct Answer: C — Purple
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Q. What is the color of the complex ion [Cu(NH3)4]2+? (2021)
A.
Blue
B.
Green
C.
Yellow
D.
Red
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Solution
[Cu(NH3)4]2+ is known to exhibit a blue color due to d-d transitions.
Correct Answer: A — Blue
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Q. What is the color of the flame produced by burning strontium salts? (2023)
A.
Red
B.
Green
C.
Blue
D.
Yellow
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Solution
Strontium salts produce a red flame when burned.
Correct Answer: A — Red
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