Which of the following is an Inert Gas?

• Hydrogen
• Nitrogen
• Oxygen
• Argon
Correct Option: D  [ Argon ]

Remark:

An instrument used for measuring depth of an ocean is called?

• Hydrometer
• Hygrometer
• Fathometer
• Galvanometer
Correct Option: A  [ Hydrometer ]

Remark:

Man first landed on the surface of the Moon in :

• 1967
• 1968
• 1969
• 1970
Correct Option: C  [ 1969 ]

Remark:

Who invented Dynamite?

• J B Dunlop
• Alfred Nobel
• James Simons
• Peter Hargreaves
Correct Option: B  [ Alfred Nobel ]

Remark:

In medical terminology, USG stands for:

• Undersized gland
• Ultrasonography
• Unsegmented gonads
• None of the above
Correct Option: B  [ Ultrasonography ]

Remark:

To an astronaut in space, the sky appears to be:

• Red
• White
• Dark
• Blue
Correct Option: C  [ Dark ]

Remark:

The salinity of the sea water is:

• 1.5 %
• 2.5 %
• 3.5 %
• 4.5 %
Correct Option: C  [ 3.5 % ]

Remark:

If a sample of soil is found to have a pH value of 8.25, it is:

• acidic
• neutral
• alkaline
• None of the above
Correct Option: C  [ alkaline ]

Remark:

Hydro?uoric acid is not kept in glass bottles because it reacts with:

• visible light
• sodium oxide of glass
• aluminium oxide of glass
• silicon dioxide of glass
Correct Option: D  [ silicon dioxide of glass ]

Remark:

The stars twinkle at night because:

• they emit energy
• of diffraction
• of refraction
• of relection
Correct Option: C  [ of refraction ]

Remark: