Matter in Our Surroundings - 1 (Class IX)
States of matter, intermolecular forces, and phase changes
Questions
Which of the following substances has the highest force of attraction among its particles?
- Air
- Water
- Gel
- Stick
Which of the following influences intermolecular forces?
- Intermolecular space
- Radius of molecules
- Colour of the molecules
- Chemical properties of molecules
Which of the following cannot be a property of molecules of a substance?
- Small in size
- Variable in shape
- Possess kinetic energy
- Attract each other
Which of the following determines the physical nature of a chemical substance?
- Molecular weight
- Molecular motion
- Molecular shape
- Molecular reactivity
Which of the following has the highest force of attraction between its particles?
- Juice
- Bat
- Honey
- Methane
What is the force of attraction between similar particles called?
- Adhesion
- Cohesion
- Collision
- Fusion
What does melting point of a solid indicate?
- Randomness of its particles
- Strength of force of attraction between particles
- Kinetic energy of particles
- Inter molecular space between particles
What is the effect of heating on kinetic energy of molecules?
- Decrease in K.E.
- No effect
- Increase in K.E.
- May increase or decrease in K.E.
In which of the following are the particles vibrate about their mean position?
- Iron
- Water vapour
- Perfume
- Acid
Which of the following is responsible for definite shape of an iron ball?
- Strong forces of attraction between molecules of iron ball
- Large distance between the molecules of iron ball
- High speed of molecules of iron ball
- Random motion of molecules of iron ball
Dry ice at room temperature is converted into gas directly. What is this process called?
- Melting
- Vaporisation
- Condensation
- Sublimation
In which process is heat energy transformed into potential energy?
- Freezing
- Cooling
- Melting
- Boiling
How is the force of attraction between the particles of a liquid affected during evaporation process?
- The force of attraction remains unchanged.
- The force of attraction increases.
- The force of attraction decreases.
- The force of attraction first increases and then decreases.
Which of the following is a gas at room temperature?
- Water
- Dry ice
- Copper
- Alcohol
Which of the following processes can occur in the absence of heat?
- Melting
- Boiling
- Sublimation
- Vapourisation
What makes water to take the shape of the container in which it is poured?
- Weak forces of attraction between molecules
- Vibration of particles about their mean position
- Arrangement of particles in a definite manner
- Absence of space between particles
Which of the following has the weakest intermolecular forces between its particles?
- Gel
- Water
- Carbon dioxide
- Glass
Fragrance of perfume spreads rapidly in a room. What is the reason behind this phenomenon?
- High kinetic energy of particles of vapour
- Strong force of attraction among particles
- Large number of particles
- Lack of definite shape of gas particles
Which of the following does not have definite shape and volume?
- Mercury
- Methane
- Milk
- Marble
Which of the following has the highest kinetic energy in its particles?
- Oxygen
- Mercury
- Vinegar
- Bullet
Which of the following statements is not true about particles of oxygen?
- They have large intermolecular distance between them.
- They have negligible force of attraction between them.
- They vibrate around their mean position.
- They have high kinetic energy.
Which of the following is not true for boiling process?
- It is a rapid process.
- It takes place at the surface of a liquid.
- It takes place at definite temperature.
- It converts liquid into vapour.
Which of the following is true for evaporation?
- It occurs at all temperatures.
- It is a fast process.
- It occurs throughout the water body.
- It heats the surroundings.