cbse nine

In which state of matter , process of diffusion is fastest?

• Liquids

• Gases

• Solids

• Semi - solids

The substances which occupy some space and having some mass called

• Particles

• Impure substance

• Ions

• Matter

Particles of matter having space between them is called

• Interstitial space

• Intermolecular space

• Vacant space

• None of the above

On converting 25⁰C, 38⁰C and 66⁰C to kelvin scale,the correct sequence of temperature will be

• 298 K,311 K and 339 K

• 298 K,300 K and 338 K

Latent heat of fusion is amount of

• heat energy required to change 1 kg solid into liquid completely at its melting point.

• heat energy required to convert 1 kg solid into liquid at room temperature

• heat energy required to change 1 g of solid into liquid completely

• heat energy required to change 1 kg of solid into liquid at any temperature.

Which of the following is most suitable for summer?

• Cotton

• Nylon

• Polyester

• Silk

When water gets solidified into ice, then heat is:

• absorbed

• evolved

• first absorbed then evolved

• initially evolved then absorbed

The physical state of a matter depends upon

• temperature and pressure

• temperature only

• pressure only

• nature of substance

A student notices that a substance "X" has fixed volume and when transferred from one container to another, it takes the shape of that container. Identify the state of matter that substance "X" belong to:

• Liquid & gas

• Gas

• Solid

• Liquid

A student adds ink to water. The ink particles spread throughout the water. Which property of water allows the ink particles to diffuse in it?

• fixed volume

• inability to compress

• intermolecular spaces

• ability to change shape