General ScienceQuestion 1 of 25
Which organelle is known as the powerhouse of the cell?
❌ Incorrect. Mitochondria generate ATP, making them the powerhouse.
✅ Correct! Mitochondria produce ATP through cellular respiration.
General ScienceQuestion 2 of 25
What is the SI unit of electric current?
❌ Incorrect. The Ampere (A) is the SI base unit of current.
✅ Correct! Ampere measures rate of charge flow.
General ScienceQuestion 3 of 25
Which gas turns lime water milky?
❌ Incorrect. CO2 forms insoluble calcium carbonate.
✅ Correct! Carbon dioxide reacts with lime water to produce white precipitate.
General ScienceQuestion 4 of 25
What is the chemical formula of rust?
❌ Incorrect. Rust is hydrated iron(III) oxide: Fe₂O₃·xH₂O.
✅ Correct! Rust is hydrated iron(III) oxide.
General ScienceQuestion 5 of 25
What is the pH value of pure neutral water at 25°C?
❌ Incorrect. Neutral substances have a pH of exactly 7.
✅ Correct! Pure water has an equal concentration of H⁺ and OH⁻ ions (pH 7).
General ScienceQuestion 6 of 25
Which tissue is responsible for transporting water in plants?
❌ Incorrect. Phloem carries food; Xylem transports water.
✅ Correct! Xylem conducts water and dissolved minerals upward from roots.
General ScienceQuestion 7 of 25
The rate of change of momentum is proportional to what?
❌ Incorrect. According to Newton’s Second Law, dp/dt = F.
✅ Correct! Newton’s Second Law states F = dp/dt.
General ScienceQuestion 8 of 25
Which lens is used to correct Myopia (near-sightedness)?
❌ Incorrect. Concave (diverging) lenses correct myopia.
✅ Correct! A concave lens diverges light to focus images precisely onto the retina.
General ScienceQuestion 9 of 25
What is the value of acceleration due to gravity (g) at Earth’s surface?
❌ Incorrect. Standard surface gravity is 9.8 m/s².
✅ Correct! g ≈ 9.8 m/s² on Earth’s surface.
General ScienceQuestion 10 of 25
Which metal is liquid at room temperature?
❌ Incorrect. Mercury (Hg) is the liquid metal (Bromine is a non-metal).
✅ Correct! Mercury is the only metal liquid at standard room conditions.
General ScienceQuestion 11 of 25
Where does digestion of proteins begin in the human alimentary canal?
❌ Incorrect. Pepsin initiates protein breakdown in the stomach.
✅ Correct! Gastric juice containing pepsin begins digesting proteins in the stomach.
General ScienceQuestion 12 of 25
What is the unit of electrical resistance?
❌ Incorrect. Electrical resistance is measured in Ohms (Ω).
✅ Correct! Resistance (R = V/I) has the SI unit Ohm (Ω).
General ScienceQuestion 13 of 25
Which gas is released during photosynthesis?
❌ Incorrect. Water molecules split during photosynthesis releasing O₂.
✅ Correct! Photolysis of water releases oxygen gas into the atmosphere.
General ScienceQuestion 14 of 25
What is the common name of Sodium Bicarbonate (NaHCO₃)?
❌ Incorrect. NaHCO₃ is Baking Soda. (Washing soda is Na₂CO₃·10H₂O).
✅ Correct! Sodium bicarbonate is everyday baking soda.
General ScienceQuestion 15 of 25
What is the functional and structural unit of the human kidney?
❌ Incorrect. Nephrons filter the blood in the kidney (Neurons belong to nerves).
✅ Correct! Each kidney contains roughly 1 million filtering nephrons.
General ScienceQuestion 16 of 25
Sound waves cannot travel through which of the following?
❌ Incorrect. Sound is a mechanical wave requiring a material medium.
✅ Correct! Mechanical sound waves cannot propagate through a vacuum.
General ScienceQuestion 17 of 25
Which blood group is known as the universal donor?
❌ Incorrect. O negative red blood cells have no A, B, or Rh antigens.
✅ Correct! O negative can safely be given to all blood types in emergencies.
General ScienceQuestion 18 of 25
Which mirror is used by dentists to view enlarged teeth images?
❌ Incorrect. Concave mirrors produce magnified, upright virtual images close up.
✅ Correct! Concave mirrors provide magnified views of teeth held within focal length.
General ScienceQuestion 19 of 25
What is the atomic number of Carbon?
❌ Incorrect. Carbon has 6 protons (Atomic Number = 6; Mass number = 12).
✅ Correct! Carbon has atomic number 6.
General ScienceQuestion 20 of 25
Which plant hormone is primarily responsible for fruit ripening?
❌ Incorrect. Ethylene gas triggers ripening in fruits.
✅ Correct! Ethylene is the gaseous phytohormone regulating ripening.
General ScienceQuestion 21 of 25
Which acid is naturally found in vinegar?
❌ Incorrect. Vinegar contains 5–8% ethanoic (acetic) acid.
✅ Correct! Dilute ethanoic (acetic) acid is known as vinegar.
General ScienceQuestion 22 of 25
What causes the twinkling of stars at night?
❌ Incorrect. Refractive index changes in air layers refract starlight continually.
✅ Correct! Atmospheric refraction bends distant point starlight continuously.
General ScienceQuestion 23 of 25
Which gas is predominantly responsible for global warming?
❌ Incorrect. Excess Carbon Dioxide (CO₂) drives the greenhouse effect.
✅ Correct! CO₂ emissions trap thermal infrared radiation.
General ScienceQuestion 24 of 25
Which enzyme present in saliva breaks down starch into sugars?
❌ Incorrect. Salivary amylase (ptyalin) converts starch to maltose.
✅ Correct! Salivary amylase initiates carbohydrate breakdown in the mouth.
General ScienceQuestion 25 of 25
What is the primary commercial unit of electrical energy?
❌ Incorrect. Household meter electricity is billed per kilowatt-hour (1 unit = 1 kWh).
✅ Correct! 1 kWh equals 3.6 × 10⁶ Joules. Great job completing the quiz!
its very helpful 😊