Showing 71–80 of 100 questions
in General Science
Q.71
Easy
General Science
Which vitamin is synthesized by the human body when exposed to sunlight?
A
Vitamin A
B
Vitamin B
C
Vitamin D
D
Vitamin C
Correct Answer:
C. Vitamin D
Explanation:
Vitamin D is produced by the body when skin is exposed to ultraviolet rays from the sun.
Q.72
Easy
General Science
Which gas is used for respiration by most organisms?
A
Nitrogen
B
Oxygen
C
Carbon dioxide
D
Hydrogen
Correct Answer:
B. Oxygen
Explanation:
Oxygen is essential for aerobic respiration in most organisms. It is used in cellular respiration to produce energy (ATP).
Q.73
Medium
General Science
Which of the following is an example of a conductor?
A
Rubber
B
Copper
C
Glass
D
Plastic
Correct Answer:
B. Copper
Explanation:
Copper is an excellent electrical conductor that allows electricity to flow through it easily. Rubber, glass, and plastic are insulators.
Q.74
Medium
General Science
What is the percentage of oxygen in the Earth's atmosphere?
Explanation:
Oxygen comprises approximately 21% of Earth's atmosphere. Nitrogen makes up about 78%, with other gases comprising the remainder.
Q.75
Medium
General Science
Which disease is caused by iodine deficiency?
A
Scurvy
B
Goiter
C
Anemia
D
Rickets
Correct Answer:
B. Goiter
Explanation:
Goiter is caused by insufficient iodine in the diet, leading to thyroid gland enlargement. Iodine is essential for thyroid hormone production.
Q.76
Medium
General Science
What is the SI unit of electrical current?
A
Volt
B
Ohm
C
Ampere
D
Watt
Correct Answer:
C. Ampere
Explanation:
The Ampere (A) is the SI unit of electrical current, named after physicist André-Marie Ampère.
Q.77
Medium
General Science
Which planet in our solar system has the most moons?
A
Saturn
B
Jupiter
C
Uranus
D
Neptune
Correct Answer:
B. Jupiter
Explanation:
Jupiter has 95 confirmed moons (as of 2024), making it the planet with the most moons in our solar system.
Q.78
Medium
General Science
What is the process of conversion of iron into rust primarily called?
A
Reduction
B
Oxidation
C
Corrosion
D
All of the above
Correct Answer:
C. Corrosion
Explanation:
Corrosion is the process of rust formation. Iron oxidation in the presence of moisture and oxygen leads to rust (Fe2O3).
Q.79
Medium
General Science
Which gland produces insulin in the human body?
A
Thyroid gland
B
Pancreas
C
Pituitary gland
D
Adrenal gland
Correct Answer:
B. Pancreas
Explanation:
The pancreas produces insulin, a hormone that regulates blood glucose levels. Beta cells in the pancreas secrete insulin.
Q.80
Hard
General Science
What is the focal length of a plane mirror?
A
Zero
B
Infinity
C
Equal to radius of curvature
D
Half the radius
Correct Answer:
B. Infinity
Explanation:
A plane mirror has infinite focal length because it does not converge or diverge light rays.
