Ch 1: Matter in Our Surroundings

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

• Liquids

• Solids

• Gases

• Semi-solids

Intermolecular forces of attraction are least effective in:

• Solids

• Gases

• Liquids

• Plasma

During summer, water kept in an earthen pot becomes cool because of the phenomenon of:

• diffusion

• transpiration

• osmosis

• evaporation

On converting 25°C, 38°C and 66°C to Kelvin scale, the correct sequence of temperature will be:

• 298 K, 311 K and 339 K

• 298 K, 300 K and 338 K

• 273 K, 278 K and 543 K

• 298 K, 310 K and 372 K

Which condition out of the following will increase the evaporation of water?

• Increase in temperature of water

• Decrease in temperature of water

• Less exposed surface area of water

• Adding common salt to water

A few substances are arranged in the increasing order of "forces of attraction" between their particles. Which one of the following represents a correct arrangement?

• water, air, wind

• air, sugar, oil

• oxygen, water, sugar

• sugar, juice, air

When water gets solidified into ice, then heat is:

• absorbed

• evolved

• first absorbed then evolved

• initially evolved then absorbed

Choose the correct statement of the following:

• Conversion of vapours into solid without passing through the liquid state is called vapourisation

• Conversion of vapours into solid without passing through the liquid state is called freezing

• Conversion of solid into liquid is called freezing

• Conversion of solid into vapours without passing through the liquid state is called sublimation

Sponge is a solid but still it can be compressed because it has _______ .

What is dry ice?

• Solid oxygen

• Solid nitrogen

• Solid carbon dioxide

• Solid water