NDA Practice Questions — All Questions

The SI unit of force is the:

• a.Joule
• b.Pascal
• c.Newton✓
• d.Watt

Force is measured in newtons (N).

The chemical symbol for gold is:

• a.Gd
• b.Au✓
• c.Go
• d.Ag

Gold's symbol is Au (from Latin 'aurum').

The speed of light in a vacuum is approximately:

• a.3,000,000 km/s
• b.3,000 km/s
• c.30,000 km/s
• d.300,000 km/s✓

Light travels about 300,000 km per second in a vacuum.

The Earth revolves around the:

• a.Mars
• b.Sun✓
• c.Its own axis only
• d.Moon

The Earth revolves around the Sun (and rotates on its axis).

Which is a noble (inert) gas?

• a.Nitrogen
• b.Hydrogen
• c.Helium✓
• d.Oxygen

Helium is a noble (inert) gas.

The instrument used to measure atmospheric pressure is the:

• a.Thermometer
• b.Speedometer
• c.Ammeter
• d.Barometer✓

A barometer measures atmospheric pressure.

The highest mountain above sea level is:

• a.Nanda Devi
• b.Kangchenjunga
• c.K2
• d.Mount Everest✓

Mount Everest is the highest mountain above sea level.

Water is made of hydrogen and:

• a.Nitrogen
• b.Carbon
• c.Oxygen✓
• d.Chlorine

Water (H2O) is hydrogen and oxygen.