351. Ultraviolet radiation in the stratosphere is absorbed by –

1. SO2
2. Ozone
3. Oxygen
4. Argon

Option “2” is correct
Ultraviolet radiation in the stratosphere is absorbed by Ozone.
352. The tip of the match-stick contains –

1. Phosphorus pentoxide
2. White phosphorus
3. Red phosphorus
4. Phosphorus trichloride

Option “3” is correct
The tip of the match stick contains Red Phosphorus.
353. The anode in a dry cell consists of –

1. Copper
2. Zinc
3. Cadmium
4. Graphite

Option “2” is correct
The anode in a dry cell consists of Zinc.
354. Milk is an example of:

1. A gel
2. A foam
3. An emulsion
4. A suspension

Option “3” is correct
An emulsion is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. Milk is an example of an emulsion.
355. CNG used in automobiles to check pollution mainly consists of-

1. CH4
2. CO2
3. N2
4. H2

Option “1” is correct
CNG is made by compressed natural gas which is mainly composed of Methane (CH_4 ).
356. Which of the following is the procedure for a biogas plant-?

1. Fermentation
2. Reduction
3. Hydrogenation
4. Polymerization

Option “1” is correct
The cow dung or gobar gas has a lot of energy which can be stored for a biogas plant by the process of fermentation.
357. Which one of the following is not an explosive:

1. Trinitrotoluene (TNT)
2. Trinitroglycerine
3. Cyclotrimethylene Trinitramine (RDX)
4. Nitrochloroform

Option “4” is correct
Nitrochloroform is used as anaesthertics before the operation of the patient to make them unconscious. Other options are explosive.
358. Which of the following is an anti-diabetic drug?

1. Insulin
2. Penicillin
3. Chloroquine
4. Aspirin

Option “1” is correct
Insulin is an antidiabatic drug.
359. Name the catalyst used in the conversion of milk into curd?

1. Pepsin
2. Invertase
3. Lactase
4. Diastase

Option “3” is correct
Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. The curd forms because of the chemical reaction between the lactic acid bacteria and casein. Thus, lactase is the catalyst used in conversion of milk into curd.
360. _______ fiber is used in making bristles for brushes.

1. Kevlar
2. Nylon-66
3. Terylene
4. Lexan

Option “2” is correct
Nylon 66 is a type of polyamide or Nylon. It is used in plastic Industries in making bristles for brushes.
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178 thoughts on “Chemistry”

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