The type of glass used in making prisms and lenses is—

A). Soft glass

B). Pyrex glass

C). Jena glass

D). Flint glass

Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous glass called—

A). Carbon Monoxide

B). Phosphine

C). Phosgene

D). None of these

Which of the following is commonly called polyamide?

A). Rayon

B). Orion

C). Ethylene

D). Nylon

Hydrometer is an instrument—

A). For measuring sound in water

B). To detect the presence of hydrogen in the atmosphere

C). For measuring the specific gravity of liquids

D). To detect the changes in atmospheric humidity

Which thermometer is used to indicate the lowest temperature?

A). Clinical thermometer

B). Gas thermometer

C). Alcohol thermometer

D). Resistance thermometer

A chronometer measure—

A). Sound waves

B). Time

C). Water waves

D). Color contrast

If temperature is kept constant during the reaction the process is called—

A). Adiabatic

B). Isobaric

C). Isochoric

D). Isothermal

Cholera is caused by—

A). Vibrio cholera

B). Salmonella

C). Bacteria occurs

D). None of these

Which of the following gases is obtained by the reaction of water with calcium carbide?

A). Acetylene

B). Ethylene

C). Methane

D). Water gas

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