CLASS 9 MATTER IN OUR SURROUNDING

Shivam visited an LPG unit and found that the gas can be liquified at specific conditions of temperature and pressure. Help him to identify the correct set of conditions.

• High temperature and high pressure.

• Low temperature and low pressure.

• Low temperature and high pressure.

• High temperature and low pressure.

Tags

NGSS.MS-PS1-4

Which of the following conditions will increase the rate of evaporation?

• Increase in temperature of water

• Decrease in wind speed

• Decrease in surface area of water

• Adding sugar to water

Tags

NGSS.MS-PS1-4

Which of the following is incorrect?

• Solids have fixed shape and fixed volume.

• Liquids have fixed volume but not shape

• Gases have neither fixed shape nor volume

• The particles have least intermolecular space but maximum kinetic energy in liquids.

Tags

NGSS.MS-PS1-4

Which of the following phenomena always results in the cooling effect?

• condensation

• sublimation

• crystallisation

• evaporation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When heat is constantly supplied by a burner to boiling water, then the temperature of water during vapourisation

• Rises very slowly

• Rises rapidly until steam is produced

• First rises and then becomes constant

• Does not rise at all

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When water at 0°C freezes to form ice at the same temperature of 0°C, then it

• Absorbs some heat

• Releases some heat

• Neither absorbs nor releases heat

• Absorbs exactly 3.34 x 10⁵J/kg of heat

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:

• Air is heavier than bromine

• Both air and bromine have the same density

• Bromine is heavier than air

• Bromine cannot be heavier than air because it is going upwards against gravity

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is

• Krypton

• Kerosene

• Carbon steel

• Carbon dioxide

Tags

NGSS.MS-PS1-4

Which of the following causes the temperature of a substance to remain constant while it is undergoing a change in its state?

• Latent heat

• Lattice energy

• Loss of heat

• None of these

Tags

NGSS.MS-PS1-4

Which of the following statement is not true regarding the characteristic of matter?

• Particles of a matter are randomly moving in all directions.

• Kinetic energy of the particles increases with a rise in temperature

• Kinetic energy of the particles of all maters remains the same at a particular temperature.

• Particles of matter diffuse into each other on their own.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5