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Matter in Our Surroundings — Class 9 CBSE Science MCQs with Solutions
Free Class 9 CBSE Science Matter in Our Surroundings MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — easy
Which of the following is NOT a property of particles of matter?
A. Particles have interparticle spaces
B. Particles attract each other
C. Particles are stationary ✓ Correct
D. Particles move continuously
Solution: Particles of matter are continuously moving due to kinetic energy.
Q2 — easy
SI unit of temperature is:
A. Degree Celsius (°C)
B. Kelvin (K) ✓ Correct
C. Fahrenheit (°F)
D. Joule (J)
Solution: The SI unit of temperature is Kelvin (K). 0°C = 273.15 K.
Q3 — easy
Convert 300 K to Celsius scale:
A. 27°C ✓ Correct
B. 30°C
C. 100°C
D. 273°C
Solution: 300 K − 273 = 27°C.
Q4 — easy
Process of change of liquid into vapor at any temperature below its boiling point is:
A. Boiling
B. Evaporation ✓ Correct
C. Condensation
D. Sublimation
Solution: Evaporation is a surface phenomenon occurring below boiling point.
Q5 — easy
Latent heat of fusion of ice is the heat energy required to change 1 kg of ice into water at its melting point without change in:
A. Volume
B. Temperature ✓ Correct
C. Mass
D. Density
Solution: Latent heat causes phase change without changing temperature.
Q6 — easy
Direct conversion of a solid into gas without passing through liquid state is called:
A. Evaporation
B. Sublimation ✓ Correct
C. Condensation
D. Fusion
Solution: Sublimation (e.g. camphor, ammonium chloride, dry ice) bypasses the liquid phase.
Q7 — easy
Dry Ice is chemically:
A. Solid water
B. Solid Carbon Dioxide (CO₂) ✓ Correct
C. Solid Methane
D. Liquid Nitrogen
Solution: Solid CO₂ stored under high pressure is called Dry Ice.
Q8 — easy
Rate of evaporation increases with:
A. Decrease in surface area
B. Decrease in temperature
C. Increase in wind speed and surface area ✓ Correct
D. Increase in humidity
Solution: Higher surface area, temperature, and wind speed accelerate evaporation.
Q9 — easy
Evaporation causes cooling because evaporating liquid particles absorb energy from:
A. Surroundings ✓ Correct
B. Sun only
C. Air pressure
D. Substrate only
Solution: Molecules absorb latent heat of vaporization from surroundings, lowering temperature.
Q10 — easy
Which state of matter consists of super-energetic and super-excited ionized gases (as in neon sign bulbs)?
A. Gas
B. Plasma ✓ Correct
C. Bose-Einstein Condensate
D. Solid
Solution: Plasma consists of ionized gases glowing with high energy.
Q11 — easy
High compressibility is a characteristic feature of:
A. Solids
B. Liquids
C. Gases ✓ Correct
D. Crystals
Solution: Gases have large intermolecular spaces, making them highly compressible.
Q12 — easy
Humidity refers to:
A. Temperature of air
B. Amount of water vapor present in air ✓ Correct
C. Wind speed
D. Density of air
Solution: Humidity is the concentration of water vapor in atmosphere.
Q13 — easy
During hot summer days, water kept in an earthen pot (matka) becomes cool due to:
A. Transpiration
B. Evaporation through pores ✓ Correct
C. Condensation
D. Precipitation
Solution: Water seeps through matka pores and evaporates, taking heat away.
Q14 — easy
Spreading of ink in water or smell of perfume in air is due to:
A. Sublimation
B. Diffusion ✓ Correct
C. Fusion
D. Sedimentation
Solution: Diffusion is intermixing of particles of two different substances on their own.
Q15 — easy
Melting point of ice on Kelvin scale is:
A. 0 K
B. 100 K
C. 273.15 K ✓ Correct
D. 373 K
Solution: Ice melts at 0°C = 273.15 K.