Science: G7: Unit 1

The colour property is a distinguishing factor between.................

• table salt and flour

• iron and gold

• oxygen and nitrogen

• oxygen and carbon dioxide

The density of a substance is a ................. property

• chemical

• physical

• biological

• chemical and physical

Density of matter =....................

• $\frac{volume}{mass}$

• $\frac{mass}{volume}$

• $mass\times volume$

• $mass+volume$

..................... gas is used in filling balloons of celebrations.

• Oxygen

• Nitrogen

• Neon

• Hydrogen

Heating coils are made up of ....................... alloy.

• iron-copper

• nickel-iron

• nickel-chrome

• chrome-copper

Metals are characterized by their ........................

• conductivity of electricity

• conductivity of heat

• high melting point

• all of the above

The intermolecular spaces among the molecules of .................... are very small.

• iron

• mercury

• nitrogen

• water

The melting process reverses the ..................... process.

• freezing

• vaporization

• condensation

• none of the above

All of the following are diatomic gaseous molecules except ...........................

• hydrogen

• nitrogen

• argon

• chlorine

One gram of ....................... contains one type of atoms.

• iron

• ammonia

• hydrogen chloride

• water