Question
41
विज्ञान
Radioactive dating is a technique which can be used to measure:
(A)
The age of rocks
(B)
Composition of rocks
(C)
Color of rocks
(D)
All of the above
Correct Answer:
The age of rocks
Explanation:
Radioactive dating is used to determine the age of rocks and other geological materials based on the decay of radioactive isotopes.
Radioactive dating is used to determine the age of rocks and other geological materials based on the decay of radioactive isotopes.
Question
42
विज्ञान
The chief source of Hydrogen Sulphide pollutant is:
(A)
Automobiles
(B)
Oil refineries
(C)
Decaying vegetation and animal matter
(D)
Thermal Power Plants
Correct Answer:
Decaying vegetation and animal matter
Explanation:
The major natural source of hydrogen sulphide (H₂S) is decaying vegetation and animal matter. H₂S can be produced from sulphur compounds during decomposition.
The major natural source of hydrogen sulphide (H₂S) is decaying vegetation and animal matter. H₂S can be produced from sulphur compounds during decomposition.
Question
43
विज्ञान
Which of the following is NOT a function of the digestive system?
(A)
Absorption of nutrients
(B)
Excretion of waste products
(C)
Production of antibodies
(D)
Mechanical breakdown of food
Correct Answer:
Production of antibodies
Explanation:
The digestive system performs mechanical and chemical digestion and absorption of nutrients. Production of antibodies is primarily a function of the immune system.
The digestive system performs mechanical and chemical digestion and absorption of nutrients. Production of antibodies is primarily a function of the immune system.
Question
44
विज्ञान
Which of the following is not a protein?
(A)
Keratin
(B)
Fibroin
(C)
Oxytocin
(D)
Collagen
Correct Answer:
Oxytocin
Explanation:
Oxytocin is a peptide hormone, not a protein. Keratin, fibroin and collagen are proteins.
Oxytocin is a peptide hormone, not a protein. Keratin, fibroin and collagen are proteins.
Question
45
विज्ञान
Which hormone is responsible for the development of secondary sexual characteristics in males?
(A)
Estrogen
(B)
Progesterone
(C)
Testosterone
(D)
Growth hormone
Correct Answer:
Testosterone
Explanation:
Testosterone is the primary hormone responsible for the development of secondary sexual characteristics in males, such as facial and body hair, deepening of the voice and muscle development.
Testosterone is the primary hormone responsible for the development of secondary sexual characteristics in males, such as facial and body hair, deepening of the voice and muscle development.
Question
46
विज्ञान
The process by which cells divide to produce identical copies of themselves is called:
(A)
Meiosis
(B)
Mitosis
(C)
Fertilization
(D)
Apoptosis
Correct Answer:
Mitosis
Explanation:
Mitosis is the process in which a cell divides to produce two genetically identical daughter cells.
Mitosis is the process in which a cell divides to produce two genetically identical daughter cells.
Question
47
विज्ञान
Which of the following is NOT a type of carbohydrate?
(A)
Glucose
(B)
Cellulose
(C)
Starch
(D)
Lipid
Correct Answer:
Lipid
Explanation:
Glucose, cellulose and starch are carbohydrates, whereas lipid is a class of fats and is not a carbohydrate.
Glucose, cellulose and starch are carbohydrates, whereas lipid is a class of fats and is not a carbohydrate.
Question
48
विज्ञान
Solar energy is converted into ATP in
(A)
Mitochondria
(B)
Chloroplast
(C)
Peroxisome
(D)
Nucleus
Correct Answer:
Chloroplast
Explanation:
During photosynthesis, ATP is produced in chloroplasts using light energy.
During photosynthesis, ATP is produced in chloroplasts using light energy.
Question
49
विज्ञान
Which of the following is the smallest unit of biological classification?
(A)
Kingdom
(B)
Phylum
(C)
Species
(D)
Genus
Correct Answer:
Species
Explanation:
Species is the basic and smallest major unit of biological classification.
Species is the basic and smallest major unit of biological classification.
Question
50
विज्ञान
Which of the following hormones is responsible for the fight-or-flight response in mammals?
(A)
Adrenaline
(B)
Insulin
(C)
Cortisol
(D)
Growth hormone
Correct Answer:
Adrenaline
Explanation:
Adrenaline (epinephrine) is secreted by the adrenal glands and activates the fight-or-flight response during emergencies.
Adrenaline (epinephrine) is secreted by the adrenal glands and activates the fight-or-flight response during emergencies.
Total Questions:
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