Which of the following is NOT a renewable energy source?
A Solar energy B Wind energy C Coal D Hydroelectric energy
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
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
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
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
Rusting of iron is a chemical change as a new substance (iron oxide) is formed. Others are physical changes.
Advertisement
Which planet is known as the Red Planet?
A Venus B Mars C Jupiter D Saturn
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
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
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
Water boils at 100°C (373.15 K) at standard atmospheric pressure of 1 atm.
Which gas is essential for respiration in humans?
A Nitrogen B Carbon dioxide C Oxygen D Hydrogen
Oxygen is essential for aerobic respiration in humans. It is used by mitochondria to produce ATP.
What is the chemical formula of table salt?
A KCl B NaCl C CaCl2 D MgCl2
Table salt is sodium chloride (NaCl), composed of sodium and chlorine ions.
Which organ in the human body is responsible for filtering blood and producing urine?
A Liver B Pancreas C Kidney D Heart
Kidneys filter waste products from the blood to produce urine. Each person typically has two kidneys.
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
The standard acceleration due to gravity at Earth's surface is approximately 9.8 m/s² or 10 m/s² for approximations.
Which gas is primarily responsible for the greenhouse effect?
A Nitrogen B Carbon dioxide C Oxygen D Argon
Carbon dioxide (CO₂) is the primary greenhouse gas responsible for global warming. It traps heat in the atmosphere.
What is the chemical formula for table salt?
A NaCl B KCl C CaCl₂ D MgCl₂
Table salt is sodium chloride (NaCl), composed of sodium and chlorine ions in a 1:1 ratio.
Which vitamin is produced by the skin when exposed to sunlight?
A Vitamin A B Vitamin B C Vitamin D D Vitamin E
Vitamin D is synthesized in the skin upon exposure to ultraviolet (UV) radiation from sunlight.
Which element has the atomic number 6?
A Oxygen B Nitrogen C Carbon D Helium
Carbon has atomic number 6, meaning it has 6 protons in its nucleus. It is the basis of all organic compounds.
What is the boiling point of water at standard atmospheric pressure?
A 90°C B 100°C C 110°C D 80°C
Water boils at 100°C (212°F) at standard atmospheric pressure of 1 atm or 101.325 kPa.
Which of the following is a non-renewable energy source?
A Solar energy B Wind energy C Coal D Hydroelectric energy
Coal is a fossil fuel and non-renewable energy source. Solar, wind, and hydroelectric are renewable sources.
Which of the following is the hardest naturally occurring substance on Earth?
A Graphite B Diamond C Quartz D Feldspar
Diamond is the hardest naturally occurring substance, rating 10 on the Mohs hardness scale.
