General Science - Chemistry MCQ's

Question 241 :
Glycol is added to aviation gasoline because it

1. reduces evaporation of petrol
2. increases efficiency of petrol
3. prevents freezing of petrol
4. reduces consumption of petrol

Question 242 :
Milk of Magnesia is a suspension of :

1. magnesium sulphate
2. magnesium carbonate
3. magnesium hydroxide
4. magnesium chloride

Question 243 :
Nucleus of an atom consists of

1. Proton
2. Neutron
3. Proton and Neutron
4. Electron Proton and Neutron

Question 244 :
The RefrigerantFREONis

1. Calcium Tetra Fluoride
2. Difluoro Dichloro Methane
3. Fluorspar and Felspar
4. HydrofluosllicicAcid

Question 245 :
Impure camphor is purified by

1. sublimation
2. fractional crystallisation
3. fractional distillation
4. steam distillation

Question 246 :
When Hydrogen starts burning in air it produces ?

1. Ammonia
2. Water
3. Methane
4. (4 ) Carbonic Acid

Question 247 :
Which one of the following is an example of a gel ?

1. Cheese
2. Milk
3. Face cream
4. Shaving cream

Question 248 :
Which gas is used for converting vegetable oils into saturated fats ?

1. H2
2. 02
3. CL2
4. S02

Question 249 :
The presence of ozone in the stratosphere is responsible for

1. increasing the average global temperature in recent years
2. higher rate of photosynthesis
3. checking the penetration of ultraviolet rays to the earth
4. supplying oxygen for people travelling in jets

Question 250 :
Percentage of carbon in steel i ranges from

1. 1 to 5
2. 5 to 0
3. 0 to 0
4. 0 to 0

Question 251 :
Galena is a mineral of

1. Iron
2. gold
3. lead
4. calcium

Question 252 :
The common name for the compound having formal NaOH is

1. Caustic soda
2. Caustic potash
3. Soda ash
4. Sodium hydroxide

Question 253 :
Hydrogen is not found In atmosphere because

1. it is highly inflammable
2. it is the lightest gas
3. it is absorbed by plants
4. it immediately combines with oxygen to form water

Question 254 :
Which one of the following minerals is found in pure form?

1. Iron
2. Copper
3. Bauxite
4. Manganese

Question 255 :
Vinegar made by fermentation from cane sugar contains

1. palmitic acid
2. lactic acid
3. citric acid
4. acetic acid

Question 256 :
The total energy of revolving electron in an atom

1. cannot be negative
2. can have any value above zero
3. can never be positive
4. will always be positive

Question 257 :
Which of the following is a supercooled liquid?

1. Icecream
2. Ammonia
3. Glass
4. Wood

Question 258 :
Hydrogen bomb is based on the principle of

1. controlled fission reaction
2. uncontrolled fission reaction
3. controlled fusion reaction
4. uncontrolled fusion reaction

Question 259 :
Gobar gas contains mainly:

1. methane
2. ethylene
3. propylene
4. acetylene

Question 260 :
Glass is a

1. superheated solid
2. super cooled liquid
3. super cooled gas
4. superheated liquid .

Question 261 :
The gas which turns into liquid at the lowest temperature among the following is

1. hydrogen
2. oxygen
3. helium
4. nitrogen

Question 262 :
White coal is

1. Uranium
2. Hydroelectricity
3. Diamond
4. Ice

Question 263 :
Which of the following is a natural dye ?

1. Crystal violet
2. Aniline blue
3. Alizarin
4. Phenolphthalein

Question 264 :
Lead pencil contains

1. lead
2. ferrous sulphide
3. lead sulphide
4. graphite

Question 265 :
Which one of the following is radioactive ?

1. Cesium
2. Platinum
3. Strontium
4. Thorium

Question 266 :
Which type of fire extinguisher is used for petroleumfire ?

1. Foam type
2. Soda acid type
3. Powder type
4. None of these

Question 267 :
Black lung disease occurs in people working in

1. Electroplating industry
2. Organic solvents industry
3. Paint manufacturing industry
4. Coalmines

Question 268 :
The natural resource known as black gold is

1. coal
2. lead
3. tin
4. platinum

Question 269 :
Mercury is a :

1. solid metal
2. liquid metal
3. solid nonmetal
4. liquid nonmetal

Question 270 :
Of the following which one pollutes the air of abig city?

1. Copper
2. Chromium
3. Lead
4. Calcium