Common General Science
Physics & Chemistry Basics Quiz
15 questions on fundamental physics and chemistry concepts from NCERT 8-10. For all PSC levels.
Physics & Chemistry Basics Quiz
15 questions · 10 minutes
10:00
Q1.The SI unit of force is:
Explanation: Newton (N) is the SI unit of force. Named after Sir Isaac Newton. 1 N = force to accelerate 1 kg by 1 m/s².
Q2.Sound travels fastest in:
Explanation: Sound travels fastest in solids (steel ~5,960 m/s) > liquids (water ~1,480 m/s) > gases (air ~343 m/s). Sound cannot travel through vacuum.
Q3.The chemical formula of baking soda is:
Explanation: Baking soda is Sodium Bicarbonate (NaHCO₃). Washing soda is Na₂CO₃. Common salt is NaCl. Limestone is CaCO₃.
Q4.The pH of pure water is:
Explanation: Pure water has a pH of 7, which is neutral. Below 7 = acidic, above 7 = alkaline.
Q5.Which metal is liquid at room temperature?
Explanation: Mercury (Hg) is the only metal that is liquid at room temperature. Bromine is the only non-metal that is liquid at room temperature.
Q6.The mirror used as a rear-view mirror in vehicles is:
Explanation: Convex mirrors are used as rear-view mirrors because they provide a wider field of view, allowing drivers to see more of the road behind.
Q7.The most abundant element in the Earth's crust is:
Explanation: Oxygen is the most abundant element in Earth's crust (~46% by weight), followed by Silicon (~28%), Aluminium (~8%), and Iron (~5%).
Q8.Ohm's Law states that:
Explanation: Ohm's Law: V = IR (Voltage = Current × Resistance). This is the fundamental law of electricity.
Q9.The human hearing range is:
Explanation: Humans can hear sounds in the frequency range of 20 Hz to 20,000 Hz. Below 20 Hz = infrasound. Above 20,000 Hz = ultrasound.
Q10.The hardest natural substance is:
Explanation: Diamond (a crystalline form of carbon) is the hardest known natural substance, scoring 10 on the Mohs hardness scale.
Q11.Rusting of iron is a process of:
Explanation: Rusting is oxidation of iron: Iron + Oxygen + Moisture → Iron Oxide (rust/Fe₂O₃). It requires both oxygen and water.
Q12.Dry ice is the solid form of:
Explanation: Dry ice is solid Carbon Dioxide (CO₂). It sublimes directly from solid to gas at -78.5°C, without passing through a liquid phase.
Q13.The gas used in fire extinguishers is:
Explanation: Carbon Dioxide (CO₂) is used in fire extinguishers because it is heavier than air, non-combustible, and smothers the fire by cutting off oxygen supply.
Q14.The speed of light in vacuum is approximately:
Explanation: The speed of light in vacuum is approximately 3 × 10⁸ metres per second (about 300,000 km/s). Nothing can travel faster than light.
Q15.Laughing gas is:
Explanation: Nitrous Oxide (N₂O) is called laughing gas. It is used as an anaesthetic in dentistry and surgery. It causes a feeling of euphoria when inhaled.
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