Showing 11–20 of 132 questions
Q.11
Easy
General Science
What is the chemical formula of table salt?
A
KCl
B
NaCl
C
CaCl2
D
MgCl2
Explanation:
Table salt is sodium chloride (NaCl), composed of sodium and chlorine ions.
Q.12
Easy
General Science
Which organ in the human body is responsible for filtering blood and producing urine?
A
Liver
B
Pancreas
C
Kidney
D
Heart
Correct Answer:
C. Kidney
Explanation:
Kidneys filter waste products from the blood to produce urine. Each person typically has two kidneys.
Q.13
Easy
General Science
What is the acceleration due to gravity on Earth's surface?
A
8.8 m/s²
B
9.8 m/s²
C
10.8 m/s²
D
11.8 m/s²
Correct Answer:
B. 9.8 m/s²
Explanation:
The standard acceleration due to gravity at Earth's surface is approximately 9.8 m/s² or 10 m/s² for approximations.
Q.14
Easy
General Science
Which gas is primarily responsible for the greenhouse effect?
A
Nitrogen
B
Carbon dioxide
C
Oxygen
D
Argon
Correct Answer:
B. Carbon dioxide
Explanation:
Carbon dioxide (CO₂) is the primary greenhouse gas responsible for global warming. It traps heat in the atmosphere.
Q.15
Easy
General Science
What is the chemical formula for table salt?
A
NaCl
B
KCl
C
CaCl₂
D
MgCl₂
Explanation:
Table salt is sodium chloride (NaCl), composed of sodium and chlorine ions in a 1:1 ratio.
Q.16
Easy
General Science
Which vitamin is produced by the skin when exposed to sunlight?
A
Vitamin A
B
Vitamin B
C
Vitamin D
D
Vitamin E
Correct Answer:
C. Vitamin D
Explanation:
Vitamin D is synthesized in the skin upon exposure to ultraviolet (UV) radiation from sunlight.
Q.17
Easy
General Science
Which element has the atomic number 6?
A
Oxygen
B
Nitrogen
C
Carbon
D
Helium
Correct Answer:
C. Carbon
Explanation:
Carbon has atomic number 6, meaning it has 6 protons in its nucleus. It is the basis of all organic compounds.
Q.18
Easy
General Science
What is the boiling point of water at standard atmospheric pressure?
A
90°C
B
100°C
C
110°C
D
80°C
Explanation:
Water boils at 100°C (212°F) at standard atmospheric pressure of 1 atm or 101.325 kPa.
Q.19
Easy
General Science
Which of the following is a non-renewable energy source?
A
Solar energy
B
Wind energy
C
Coal
D
Hydroelectric energy
Explanation:
Coal is a fossil fuel and non-renewable energy source. Solar, wind, and hydroelectric are renewable sources.
Q.20
Easy
General Science
Which of the following is the hardest naturally occurring substance on Earth?
A
Graphite
B
Diamond
C
Quartz
D
Feldspar
Correct Answer:
B. Diamond
Explanation:
Diamond is the hardest naturally occurring substance, rating 10 on the Mohs hardness scale.
