Showing 1–10 of 132 questions
Which of the following is NOT a 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 all renewable sources.
What is the SI unit of electric current?
A
Volt
B
Ampere
C
Ohm
D
Watt
Correct Answer:
B. Ampere
Explanation:
Ampere (A) is the SI unit of electric current. Volt is for potential difference, Ohm for resistance, and Watt for power.
Which element has the atomic number 8?
A
Nitrogen
B
Oxygen
C
Carbon
D
Hydrogen
Correct Answer:
B. Oxygen
Explanation:
Oxygen has atomic number 8. It is essential for respiration in living organisms.
The speed of light in vacuum is approximately:
A
3 × 10^8 m/s
B
3 × 10^7 m/s
C
3 × 10^6 m/s
D
3 × 10^9 m/s
Correct Answer:
A. 3 × 10^8 m/s
Explanation:
The speed of light in vacuum is approximately 3 × 10^8 m/s or 299,792,458 m/s.
Which of the following is an example of a chemical change?
A
Melting of ice
B
Rusting of iron
C
Boiling of water
D
Dissolving salt in water
Correct Answer:
B. Rusting of iron
Explanation:
Rusting of iron is a chemical change as a new substance (iron oxide) is formed. Others are physical changes.
Which planet is known as the Red Planet?
A
Venus
B
Mars
C
Jupiter
D
Saturn
Explanation:
Mars is called the Red Planet due to the presence of iron oxide (rust) on its surface.
The process by which plants make their own food using sunlight is called:
A
Respiration
B
Photosynthesis
C
Transpiration
D
Fermentation
Correct Answer:
B. Photosynthesis
Explanation:
Photosynthesis is the process where plants convert sunlight, water, and CO2 into glucose and oxygen.
What is the SI unit of electrical resistance?
A
Ohm
B
Ampere
C
Volt
D
Watt
Explanation:
The SI unit of electrical resistance is Ohm (Ω), named after Georg Simon Ohm.
At what temperature does water boil at standard atmospheric pressure?
A
90°C
B
100°C
C
110°C
D
120°C
Explanation:
Water boils at 100°C (373.15 K) at standard atmospheric pressure of 1 atm.
Q.10
Easy
General Science
Which gas is essential for respiration in humans?
A
Nitrogen
B
Carbon dioxide
C
Oxygen
D
Hydrogen
Correct Answer:
C. Oxygen
Explanation:
Oxygen is essential for aerobic respiration in humans. It is used by mitochondria to produce ATP.
