What is the chemical symbol for sodium?
A So
B S
C Na
D Sn
The symbol “Na” comes from the Latin word Natrium for sodium.
Which organ in the human body secretes insulin?
A Liver
B Pancreas
C Kidney
D Stomach
Insulin is secreted by the pancreas to regulate blood sugar levels.
What is the speed of light in vacuum?
A 1.5 × 10⁵ km/s
B 3 × 10⁸ m/s
C 3 × 10⁶ m/s
D 1.5 × 10⁸ m/s
Light travels at approximately 300,000 km per second in a vacuum.
Which element is essential for the formation of hemoglobin?
A Calcium
B Iron
C Sodium
D Potassium
Iron helps in the production of hemoglobin, which carries oxygen in blood.
Which phenomenon explains why we see lightning before hearing thunder?
A Reflection
B Refraction
C Speed difference of light and sound
D Echo
Light travels faster than sound, so we see lightning before hearing thunder.
Which of the following is a renewable source of energy?
A Coal
B Petroleum
C Solar energy
D Natural gas
Solar energy can be replenished naturally, making it renewable.
What is the SI unit of force?
A Joule
B Newton
C Watt
D Pascal
Force is measured in newtons (N), named after Isaac Newton.
Which organ is responsible for pumping blood in the human body?
A Brain
B Heart
C Liver
D Lungs
The heart pumps oxygenated blood throughout the body.
Which process converts water into vapor?
A Condensation
B Sublimation
C Evaporation
D Fusion
Evaporation is the process of liquid water turning into vapor due to heat.
Which metal is liquid at room temperature?
A Mercury
B Lead
C Aluminum
D Zinc
Mercury is the only metal that remains liquid at room temperature.
Which planet is known as the Morning Star?
A Mars
B Venus
C Jupiter
D Mercury
Venus appears bright in the sky just before sunrise, hence called the Morning Star.
Which part of the plant absorbs water from the soil?
A Stem
B Root
C Leaf
D Flower
Roots absorb water and minerals from the soil for plant nourishment.
What type of energy is possessed by a moving body?
A Potential energy
B Chemical energy
C Kinetic energy
D Nuclear energy
The energy due to motion of a body is known as kinetic energy.
Which part of the human eye controls the amount of light entering it?
A Retina
B Cornea
C Pupil
D Iris
The iris adjusts the size of the pupil to regulate the entry of light.
Which acid is present in vinegar?
A Citric acid
B Acetic acid
C Lactic acid
D Hydrochloric acid
The sour taste of vinegar is due to acetic acid.
Which gas is known as laughing gas?
A Nitrogen
B Nitrous oxide
C Carbon dioxide
D Methane
Nitrous oxide (N₂O) is called laughing gas due to its euphoric effects.
Which part of the cell contains genetic material?
A Nucleus
B Cytoplasm
C Cell membrane
D Ribosome
The nucleus stores DNA, the genetic material of the cell.
Which scientist discovered penicillin?
A Alexander Fleming
B Louis Pasteur
C Isaac Newton
D Albert Einstein
Fleming discovered penicillin in 1928, revolutionizing medicine.
What type of mirror is used by dentists to examine teeth?
A Plane mirror
B Convex mirror
C Concave mirror
D Spherical mirror
Concave mirrors magnify the image, helping dentists see clearly.
Which gas is used in fire extinguishers?
A Oxygen
B Carbon dioxide
C Nitrogen
D Helium
CO₂ displaces oxygen and cools the fire, helping to extinguish it.
Which organelle is known as the powerhouse of the cell?
A Ribosome
B Nucleus
C Mitochondria
D Golgi body
Mitochondria generate energy in the form of ATP for cell functions.
What is the main component of natural gas?
A Ethane
B Propane
C Methane
D Butane
Natural gas mainly consists of methane (CH₄), a clean fuel.
Which part of the human body is affected by pneumonia?
A Liver
B Lungs
C Kidneys
D Heart
Pneumonia is an infection that inflames the air sacs in the lungs.
Which disease is caused by a deficiency of iodine?
A Rickets
B Scurvy
C Goitre
D Anaemia
Lack of iodine leads to enlargement of the thyroid gland, known as goitre.
Which instrument is used to measure temperature?
A Hygrometer
B Thermometer
C Barometer
D Altimeter
A thermometer measures temperature using mercury or digital sensors.