Everyday Science — All MCQs
2717 questions available
Q341.The gas used to extinguish fires is:
Correct Answer: C
CO2 displaces oxygen around the flame, suffocating the fire (FPSC 2025).
Q342.Deficiency of Vitamin C in the human diet leads to which disease?
Correct Answer: C
Vitamin C deficiency causes scurvy, resulting in bleeding gums and weakness (FPSC 2025).
Q343.Which planet in our solar system is known as the 'Red Planet'?
Correct Answer: B
Its reddish hue is caused by iron oxide (rust) on its surface (FPSC 2025).
Q344.Water reaches its maximum density at what temperature?
Correct Answer: C
Water expands as it cools below 4°C, making ice less dense than water (FPSC 2025).
Q345.The main component of natural gas (Sui Gas in Pakistan) is:
Correct Answer: C
Natural gas is composed of roughly 85% to 95% Methane (FPSC 2025).
Q346.The chemical symbol for Gold is:
Correct Answer: B
Derived from the Latin word 'Aurum' (FPSC 2025).
Q347.Which gas is most abundant in the Earth's atmosphere?
Correct Answer: B
Nitrogen makes up roughly 78% of the atmosphere (FPSC 2025).
Q348.Scurvy is a disease related to which part of the body?
Correct Answer: B
Manifests as bleeding gums, skin spots, and joint pain (FPSC 2025).
Q349.Sound waves cannot travel through which of the following?
Correct Answer: D
Sound is a mechanical wave requiring a material medium to propagate (FPSC 2025).
Q350.The process by which plants make their own food using sunlight is called:
Correct Answer: B
Plants convert light energy, CO2, and water into glucose and oxygen (FPSC 2025).
Q351.Which blood cells are responsible for carrying oxygen throughout the human body?
Correct Answer: B
They contain hemoglobin, which binds to oxygen molecules (FPSC 2025).
Q352.What is the main source of energy for our Earth?
Correct Answer: B
Solar radiation powers the biosphere and climate systems (FPSC 2025).
Q353.An instrument used to measure atmospheric pressure is called:
Correct Answer: C
Invented by Torricelli to measure air pressure (FPSC 2025).
Q354.The chemical formula of common table salt is:
Correct Answer: C
Sodium Chloride (NaCl) (FPSC 2025).
Q355.The study of earthquakes is known as:
Correct Answer: B
The scientific branch studying seismic waves and faults (FPSC 2025).
Q356.The device used to measure current in an electrical circuit is called:
Correct Answer: B
Correct Answer: Ammeter. An ammeter is a measuring instrument used to determine the electric current in a circuit.
Q357.Which gas is primarily responsible for the greenhouse effect on Earth?
Correct Answer: C
Correct Answer: Carbon Dioxide. Carbon dioxide, water vapor, and methane are primary greenhouse gases trapping infrared heat.
Q358.Which chemical element has the highest electrical conductivity of all metals?
Correct Answer: C
Correct Answer: Silver. Silver possesses the highest electrical and thermal conductivity of any element.
Q359.Which of the following is a greenhouse gas?
Correct Answer: D
Q360.Which of the following gases are known as greenhouse gases?
Correct Answer: A