51.

Removal of carbon particles from air involves the principle of

• Precipitation

• Filteration

• Electrophoresis

• Electrophoresis

Which light is least effective in photosynthesis?

• Blue light

• Green light

• Red light

• Red light

Which of the following acts as best adsorbent?

• Charcoal

• Activated Charcoal

• Activated Coconut Charcoal

• Activated Coconut Charcoal

Every hot object emits ............

• X-rays

• visible light

• infrared rays

• infrared rays

Limestone is a raw material used by which industry?

• Aluminium

• Fertilizers

• Cement

• Cement

Which is the highest quality of hard coal?

• Anthracite

• Bituminous

• Lignite

• Lignite

Sour taste of lemon is due to the presence of which of the following?

• Citric acid

• Acetic acid

• Oxalic acid

• Oxalic acid

Glycol is used to manufacture which of the following?

• Nylon

• Artificial silk

• Terylene

• Terylene

Which of the following greenhouse gases has the greatest heat-trapping ability?

• Chlorofluoro carbon

• Methane

• Carbon dioxide

• Carbon dioxide

Where is a transistor most likely to be found?

• Wrist watch

• Fuse

• Hearing Aid

• Hearing Aid