MCQ
A student performs the following experiments:
I. Compresses air in a sealed syringe.
II. Dissolves sugar in water.
III. Pushes a finger through water.
IV. Smells perfume from across the classroom.
Which sequence correctly represents the particle properties demonstrated?
a) Diffusion → Compressibility → Interparticle attraction → Interparticle spaces
b) Compressibility → Interparticle spaces → Weak interparticle attraction → Continuous movement of particles
c) Compressibility → Weak interparticle attraction → Diffusion → Interparticle spaces
d) Interparticle spaces → Compressibility → Continuous movement → Diffusion
Compressibility → Interparticle spaces → Weak interparticle attraction → Continuous movement of particles
Assertion: The fragrance of perfume spreads faster in summer than in winter.
Reason: Particles possess greater kinetic energy at higher temperatures.
A. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
I am strongest in solids,
Weak in liquids,
Almost missing in gases.
Who am I?
Interparticle attraction
Select ALL the situations that prove particles of matter are in continuous motion.
A. Perfume fragrance spreads across a room.
B. Potassium permanganate spreads in water.
C. A wooden block remains on a table.
D. Food colour spreads in warm water without stirring.
E. Steam spreads in the kitchen.
A. Perfume fragrance spreads across a room.
B. Potassium permanganate spreads in water.
D. Food colour spreads in warm water without stirring.
E. Steam spreads in the kitchen.
A chef observed the following while preparing food:
Which observation would provide the strongest evidence that particles of a solid are in constant motion even though the solid appears stationary?
a) Iron expands when heated.
b) A wooden block floats on water.
c) Ice sinks in kerosene.
d) A rock has a definite shape.
a) Iron expands when heated.
Assertion: Sugar disappears after dissolving in water.
Reason: Sugar particles change into water particles.
C. Assertion is true, but Reason is false.
I own countless empty rooms,
Yet no one can see them.
A tiny visitor enters my house,
But I neither become heavier than expected
Nor occupy the space people predicted.
Without my hidden rooms,
Many everyday experiments would fail.
What am I?
Interparticle spaces between water particles.
Which of the following observations indicate the presence of interparticle spaces?
A. Sugar dissolves in water.
B. Air can be compressed.
C. Water occupies the shape of its container.
D. Salt dissolves without a significant increase in volume.
E. Iron expands on heating.
A. Sugar dissolves in water.
B. Air can be compressed.
D. Salt dissolves without a significant increase in volume.
Two identical balloons were inflated with equal amounts of air.
Balloon A was placed in a freezer.
Balloon B was placed in sunlight.
After one hour, Balloon A became smaller while Balloon B became larger. Why so?
Cold air shrinks: In the freezer, air molecules slow down and take up less space.
Warm air expands: In the sun, air molecules speed up and push outward.
Four students make the following statements after observing sugar dissolve in water.
Student A: Sugar particles disappear because they melt.
Student B: Sugar particles occupy the spaces between water particles.
Student C: Sugar particles become water particles.
Student D: Sugar reacts chemically with water.
Who has given the scientifically correct explanation?
Student B: Sugar particles occupy the spaces between water particles.
Assertion: Diffusion occurs only in gases.
Reason: Particles of matter are always in motion.
D. Assertion is false, but Reason is true.
Three brothers entered identical rooms.
One day heat visited them all.
The eldest became like the middle.
The middle became like the youngest.
Who are the three brothers?
Solid, liquid and gas
Which properties are common to both liquids and gases?
A. Ability to flow
B. Fixed shape
C. Diffusion
D. Particles are in constant motion
E. Definite volume
A. Ability to flow
C. Diffusion
D. Particles are in constant motion
A student mixed 100 mL water with:
10 g sugar in beaker A, 10 g sand in beaker B, 10 g salt in beaker C
He noticed that sugar and salt disappeared completely after stirring, while sand settled at the bottom. in which mixture volume will be increased?
Sand in water
A closed syringe contains air. When the plunger is pushed inward, the air occupies a smaller volume. Which statement best explains this observation?
a) Air particles become smaller under pressure.
b) The number of air particles decreases.
c) The spaces between air particles decrease
d) Air particles merge to form larger particles.
c) The spaces between air particles decrease
Assertion: Heating a solid increases the distance between its particles.
Reason: Heat increases the kinetic energy of particles.
A. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
I am a journey that requires no wind or current. I travel from where I am crowded to where I am rare. A warm path makes me sprint, but a cold path makes me crawl. What am I?
Diffusion
Which properties increase when a solid is continuously heated until it becomes a gas?
A. Particle speed
B. Interparticle spacing
C. Kinetic energy
D. Freedom of particle movement
E. Interparticle attraction
A. Particle speed
B. Interparticle spacing
C. Kinetic energy
D. Freedom of particle movement
Three beakers contain equal volumes of water at 10°C, 40°C and 80°C. Equal food color are dropped into each beaker simultaneously without stirring.
In what order the spreading of food color will happen , give the order from first to last?
80oC , 40°C, 10°C
Which observation provides the strongest evidence that particles of matter remain unchanged during a change of state?
a) Steam occupies more space than water.
b) Ice melts into water without forming a new substance.
c) Water boils at 100°C under atmospheric pressure.
d) Water vapour cannot be seen with the naked eye.
b) Ice melts into water without forming a new substance.
Assertion: During boiling, bubbles form throughout the liquid.
Reason: Vapour formation occurs only at the surface during boiling.
C. Assertion is true, but Reason is false.
I am a quiet thief who never strikes from the bottom or the middle of a substance. I only take from the very top layer where the fluid meets the air, and I do not even wait for the boiling point to arrive to start stealing. What property am I?
Which of the following statements are TRUE for all three states of matter?
A. They consist of particles.
B. Their particles are in continuous motion.
C. They contain interparticle spaces.
D. Their particles attract each other.
E. They have a definite shape.
A. They consist of particles.
B. Their particles are in continuous motion.
C. They contain interparticle spaces.
D. Their particles attract each other.
A student made the following conclusions.
• Gas particles become larger when heated.
• Water occupies less volume after dissolving sugar.
• Sand dissolves more slowly than sugar.
• Solids have no interparticle spaces. make these statements correct
Give correct statements
• Gas particles become larger when heated.
•Water volume will remain same or slightly increase after dissolving sugar.
• Sand does not dissolve in water
• Solids have no interparticle spaces.