The pollutant responsible for ozone holes is

• CO₂

• SO₂

• CO

• CFC

Hydraulic action is a type of erosion caused by

• running water

• wind

• glacier

• None of these

'Sun is a constant source of energy'. Which nuclei get fused in Sun's atmosphere?

• Plutonium

• Hydrogen

• Helium

• Uranium

Acetic acid on decarboxylation gives

• butane

• methane

• ethane

• propane

Probiotic curd (yogurt) contains health benefitting good

• bacteria

• source of energy

• transgenic genes

• antibiotics

Krivoy-Rog has rich resources of

• manganese

• coal

• iron-ore

• copper

The 'fine respiratory particles' which deteriorate air quality for breathing by human beings are categorised as

• PM 0.0

• PM 2.5

• PM 8.5

• PM 10.0

According to kinetic theory of gases, at the temperature of absolute zero, the gas molecules

• start movement

• become massless

• start emitting light

• stop movement

169.

Formic acid is produced by

• white ants

• cockroaches

• red ants

• mosquitoes

When a helium atom loses an electron it becomes

• an alpha particle

• a proton

• a positive helium ion

• a negative helium ion