CSS - PMS - CCE - PCS - General Science
Light (Optics) - Refraction
The speed of light in vacuum is approximately:
A. 3 x 10^8 m/s
B. 3 x 10^6 m/s
C. 300 m/s
D. 30,000 m/s
Correct Answer: A
A: Correct because light travels at about 3 x 10^8 metres per second in vacuum. B: Wrong because this is 100 times smaller than the accepted value. C: Wrong because 300 m/s is near the speed of sound, not light. D: Wrong because 30,000 m/s is too low for light.
CSS - PMS - CCE - PCS - General Science
Stars & Solar System
Which planet is known as the Red Planet?
A. Venus
B. Mars
C. Jupiter
D. Mercury
Correct Answer: B
B: Correct because Mars appears reddish due to iron oxide on its surface. A: Wrong because Venus is not called the Red Planet. C: Wrong because Jupiter is a gas giant. D: Wrong because Mercury is the smallest planet.
CSS - PMS - CCE - PCS - General Science
Photosynthesis
Photosynthesis mainly occurs in:
A. Mitochondria
B. Chloroplasts
C. Nucleus
D. Ribosomes
Correct Answer: B
B: Correct because chloroplasts contain chlorophyll and carry out photosynthesis. A: Wrong because mitochondria release energy by respiration. C: Wrong because nucleus controls cell activities. D: Wrong because ribosomes synthesize proteins.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ purifies blood by filtering waste and producing urine?
A. Heart
B. Liver
C. Kidney
D. Lungs
Correct Answer: C
C: Correct because kidneys filter blood and remove waste through urine. A: Wrong because the heart pumps blood. B: Wrong because the liver performs metabolism and detoxification but does not make urine. D: Wrong because lungs exchange gases.
CSS - PMS - CCE - PCS - General Science
Vitamins
Which vitamin is produced in the skin by sunlight?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
Correct Answer: D
D: Correct because sunlight helps skin synthesize vitamin D. A: Wrong because vitamin A is not mainly produced by sunlight. B: Wrong because B12 is obtained mostly from animal foods or supplements. C: Wrong because vitamin C comes from diet, especially fruits.
CSS - PMS - CCE - PCS - General Science
Chemical Symbols
The chemical formula of water is:
A. CO2
B. H2O
C. O2
D. NaCl
Correct Answer: B
B: Correct because water consists of two hydrogen atoms and one oxygen atom. A: Wrong because CO2 is carbon dioxide. C: Wrong because O2 is oxygen gas. D: Wrong because NaCl is sodium chloride.
CSS - PMS - CCE - PCS - General Science
Earth Structure
Which gas is most abundant in Earth's atmosphere?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
Correct Answer: B
B: Correct because nitrogen makes up the largest share of Earth's atmosphere. A: Wrong because oxygen is second-most abundant. C: Wrong because carbon dioxide is present in small concentration. D: Wrong because hydrogen is only a trace gas.
CSS - PMS - CCE - PCS - General Science
Human Body System
The basic unit of life is:
A. Atom
B. Cell
C. Tissue
D. Organ
Correct Answer: B
B: Correct because the cell is the structural and functional unit of living organisms. A: Wrong because an atom is a unit of matter, not life. C: Wrong because tissues are groups of cells. D: Wrong because organs are made of tissues.
CSS - PMS - CCE - PCS - General Science
COP
Which country hosted COP29 in 2024?
A. Azerbaijan
B. Brazil
C. Egypt
D. UAE
Correct Answer: A
A: Correct because COP29 was hosted by Azerbaijan in Baku in 2024. B: Wrong because Brazil hosted COP30, not COP29. C: Wrong because Egypt hosted COP27. D: Wrong because UAE hosted COP28.
CSS - PMS - CCE - PCS - General Science
COP
COP30 was hosted in which Brazilian city?
A. Rio de Janeiro
B. São Paulo
C. Belém
D. Brasília
Correct Answer: C
C: Correct because COP30 was held in Belém, Brazil, in the Amazon region. A: Wrong because Rio is a major Brazilian city but was not COP30 host. B: Wrong because São Paulo was not the COP30 host city. D: Wrong because Brasília is the capital but not the COP30 venue.
CSS - PMS - CCE - PCS - General Science
Stars & Solar System
Which planet is famous for its prominent rings?
A. Earth
B. Mars
C. Saturn
D. Venus
Correct Answer: C
A: Wrong because Earth does not have prominent rings. B: Wrong because Mars does not have a ring system like Saturn. C: Correct because Saturn is famous for its bright ring system. D: Wrong because Venus has no prominent rings.
CSS - PMS - CCE - PCS - General Science
Evaporation
Evaporation causes cooling because:
A. High-energy molecules escape from the liquid
B. Water becomes heavier
C. Gravity disappears
D. Light stops moving
Correct Answer: A
A: Correct because faster molecules leave the liquid, reducing average kinetic energy and temperature. B: Wrong because cooling is not caused by water becoming heavier. C: Wrong because gravity does not disappear during evaporation. D: Wrong because light motion is unrelated to evaporative cooling.
CSS - PMS - CCE - PCS - General Science
Greenhouse Effect
Which of the following is a greenhouse gas?
A. Carbon dioxide
B. Oxygen only
C. Nitrogen only
D. Argon only
Correct Answer: A
A: Correct because carbon dioxide traps infrared radiation and contributes to the greenhouse effect. B: Wrong because oxygen is not the main greenhouse gas in this context. C: Wrong because nitrogen is not a significant greenhouse gas. D: Wrong because argon is not a significant greenhouse gas.
CSS - PMS - CCE - PCS - General Science
Waves & Sound - Echo
Sound cannot travel through:
A. Air
B. Water
C. Steel
D. Vacuum
Correct Answer: D
A: Wrong because sound travels through air. B: Wrong because sound travels through water. C: Wrong because sound travels through solids such as steel. D: Correct because sound needs a material medium and cannot travel through vacuum.
CSS - PMS - CCE - PCS - General Science
Measurement Units
The SI unit of electric current is:
A. Volt
B. Ampere
C. Ohm
D. Tesla
Correct Answer: B
A: Wrong because volt is the unit of electric potential difference. B: Correct because electric current is measured in amperes. C: Wrong because ohm is the unit of resistance. D: Wrong because tesla is the unit of magnetic flux density.
CSS - PMS - CCE - PCS - General Science
Vitamins
Vitamin D is especially important for:
A. Calcium absorption and bone health
B. Producing ink
C. Making plastic
D. Creating radio signals
Correct Answer: A
A: Correct because vitamin D supports calcium absorption and bone mineralization. B: Wrong because ink production is industrial chemistry. C: Wrong because plastic manufacturing is unrelated to vitamin D. D: Wrong because radio signals are electromagnetic waves.
CSS - PMS - CCE - PCS - General Science
Blood System
The universal donor blood group is commonly considered:
A. AB positive
B. O negative
C. A positive
D. B positive
Correct Answer: B
A: Wrong because AB positive is generally called universal recipient, not donor. B: Correct because O negative red cells lack A, B, and Rh antigens and are commonly used as universal donor type. C: Wrong because A positive has A and Rh antigens. D: Wrong because B positive has B and Rh antigens.
CSS - PMS - CCE - PCS - General Science
Chemical Symbols
The chemical symbol for sodium is:
A. So
B. Na
C. S
D. Sd
Correct Answer: B
A: Wrong because So is not sodium's symbol. B: Correct because sodium's chemical symbol is Na from Latin natrium. C: Wrong because S is sulfur. D: Wrong because Sd is not sodium's symbol.
CSS - PMS - CCE - PCS - General Science
Mechanics - Newton's Law of Motion
Newton's first law is also known as the law of:
A. Inertia
B. Reflection
C. Conservation of charge
D. Osmosis
Correct Answer: A
A: Correct because Newton's first law describes inertia, the tendency to resist change in motion. B: Wrong because reflection is related to waves/light. C: Wrong because charge conservation is an electrical principle. D: Wrong because osmosis is movement of solvent through a membrane.
CSS - PMS - CCE - PCS - General Science
Ozone
The ozone layer protects Earth by absorbing much of the Sun's:
A. Ultraviolet radiation
B. Sound
C. Visible green light only
D. Gravity
Correct Answer: A
A: Correct because ozone absorbs harmful ultraviolet radiation. B: Wrong because sound does not travel from the Sun through space to Earth in this way. C: Wrong because ozone is not mainly about green visible light. D: Wrong because gravity is a force, not radiation absorbed by ozone.