Q. What is the average duration of a human pregnancy? (2023)
A.
28 weeks
B.
36 weeks
C.
40 weeks
D.
44 weeks
Show solution
Solution
The average duration of a human pregnancy is approximately 40 weeks.
Correct Answer:
C
— 40 weeks
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Q. What is the average lifespan of a red blood cell in the human body? (2020)
A.
10 days
B.
30 days
C.
120 days
D.
1 year
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Solution
Red blood cells typically have an average lifespan of about 120 days before they are removed from circulation by the spleen.
Correct Answer:
C
— 120 days
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Q. What is the average power consumed in an AC circuit with a power factor of 0.5 and an RMS voltage of 100 V with a current of 5 A? (2020)
A.
250 W
B.
500 W
C.
125 W
D.
1000 W
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Solution
Average power (P) is given by P = V_rms × I_rms × power factor. Thus, P = 100 V × 5 A × 0.5 = 250 W.
Correct Answer:
A
— 250 W
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Q. What is the average power consumed in an AC circuit with a power factor of 0.8 and a current of 5 A at 230 V? (2022)
A.
920 W
B.
920 VA
C.
1150 W
D.
1150 VA
Show solution
Solution
Average power (P) is given by P = V × I × PF. Here, P = 230 V × 5 A × 0.8 = 920 W.
Correct Answer:
A
— 920 W
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Q. What is the average power consumed in an AC circuit with a power factor of 1? (2019)
A.
Zero
B.
RMS voltage
C.
RMS current
D.
Maximum power
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Solution
When the power factor is 1, the average power consumed is maximum and is given by P = V_rms × I_rms.
Correct Answer:
D
— Maximum power
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Q. What is the average volume of blood in an adult human body? (2020)
A.
3-4 liters
B.
4-5 liters
C.
5-6 liters
D.
6-7 liters
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Solution
The average volume of blood in an adult human body is approximately 5 to 6 liters.
Correct Answer:
C
— 5-6 liters
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Q. What is the balanced equation for the redox reaction between Cr2O7^2- and Fe^2+ in acidic medium? (2020)
A.
Cr2O7^2- + 6Fe^2+ → 2Cr^3+ + 3Fe^3+
B.
Cr2O7^2- + 3Fe^2+ → 2Cr^3+ + 3Fe^3+
C.
Cr2O7^2- + 4Fe^2+ → 2Cr^3+ + 4Fe^3+
D.
Cr2O7^2- + 2Fe^2+ → 2Cr^3+ + Fe^3+
Show solution
Solution
The balanced equation in acidic medium is Cr2O7^2- + 6Fe^2+ → 2Cr^3+ + 3Fe^3+.
Correct Answer:
A
— Cr2O7^2- + 6Fe^2+ → 2Cr^3+ + 3Fe^3+
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Q. What is the base unit of mass in the SI system? (2019)
A.
Gram
B.
Kilogram
C.
Pound
D.
Ounce
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Solution
The base unit of mass in the SI system is the kilogram (kg).
Correct Answer:
B
— Kilogram
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Q. What is the base unit of temperature in the SI system? (2020)
A.
Celsius
B.
Fahrenheit
C.
Kelvin
D.
Rankine
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Solution
The base unit of temperature in the SI system is Kelvin (K).
Correct Answer:
C
— Kelvin
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Q. What is the base unit of time in the SI system? (2019)
A.
Minute
B.
Hour
C.
Second
D.
Day
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Solution
The base unit of time in the SI system is the second (s).
Correct Answer:
C
— Second
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Q. What is the basic structural and functional unit of an animal's body? (2020)
A.
Tissue
B.
Cell
C.
Organ
D.
Organ System
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Solution
The basic structural and functional unit of an animal's body is the cell.
Correct Answer:
B
— Cell
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Q. What is the basic structural and functional unit of life in animals? (2020)
A.
Tissue
B.
Cell
C.
Organ
D.
Organ System
Show solution
Solution
The basic structural and functional unit of life in animals is the cell.
Correct Answer:
B
— Cell
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Q. What is the basic structural and functional unit of life? (2020)
A.
Tissue
B.
Organ
C.
Cell
D.
Organism
Show solution
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
Show solution
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
Show solution
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 basic unit of proteins? (2023) 2023
A.
Monosaccharide
B.
Amino acid
C.
Nucleotide
D.
Fatty acid
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Solution
Proteins are made up of amino acids, which are their basic building blocks.
Correct Answer:
B
— Amino acid
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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
Show solution
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 of water at standard atmospheric pressure?
A.
100°C
B.
0°C
C.
50°C
D.
150°C
Show solution
Solution
The boiling point of water at standard atmospheric pressure is 100°C.
Correct Answer:
A
— 100°C
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Q. What is the boiling point trend among alcohols? (2020) 2020
A.
Decreases with molecular weight
B.
Increases with molecular weight
C.
Remains constant
D.
Increases with branching
Show solution
Solution
The boiling point of alcohols increases with molecular weight due to stronger hydrogen bonding.
Correct Answer:
B
— Increases with molecular weight
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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
Show solution
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 boiling point trend among primary, secondary, and tertiary amines?
A.
Primary > Secondary > Tertiary
B.
Tertiary > Secondary > Primary
C.
Secondary > Primary > Tertiary
D.
All have the same boiling point
Show solution
Solution
Primary amines have higher boiling points than secondary and tertiary amines due to stronger hydrogen bonding.
Correct Answer:
A
— Primary > Secondary > Tertiary
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Q. What is the boiling point trend of alcohols compared to alkanes?
A.
Higher
B.
Lower
C.
Same
D.
Varies
Show solution
Solution
Alcohols have higher boiling points than alkanes due to hydrogen bonding.
Correct Answer:
A
— Higher
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Q. What is the boiling point trend of amines compared to alkanes?
A.
Higher
B.
Lower
C.
Same
D.
Varies
Show solution
Solution
Amines have higher boiling points than alkanes due to hydrogen bonding.
Correct Answer:
A
— Higher
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Q. What is the boiling point trend of carboxylic acids compared to alcohols?
A.
Higher
B.
Lower
C.
Same
D.
Depends on molecular weight
Show solution
Solution
Carboxylic acids have higher boiling points than alcohols due to stronger hydrogen bonding.
Correct Answer:
A
— Higher
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Q. What is the boiling point trend of primary, secondary, and tertiary amines?
A.
Primary > Secondary > Tertiary
B.
Tertiary > Secondary > Primary
C.
Secondary > Primary > Tertiary
D.
All have the same boiling point
Show solution
Solution
Primary amines have higher boiling points due to stronger hydrogen bonding compared to secondary and tertiary amines.
Correct Answer:
A
— Primary > Secondary > Tertiary
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Q. What is the bond angle in a methane (CH4) molecule? (2023) 2023
A.
90 degrees
B.
109.5 degrees
C.
120 degrees
D.
180 degrees
Show solution
Solution
The bond angle in methane (CH4) is approximately 109.5 degrees due to its tetrahedral geometry.
Correct Answer:
B
— 109.5 degrees
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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
Show solution
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
Show solution
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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