A quick 25 questions article on Chemistry – General Knowledge – MCQs important for competitive exams like in UPSC, state civil services, olympiads etc.
Other similar articles: Test – 1 | Test – 2 | Test – 3 | Test – 4 | Test – 5 | Test – 6 | Test – 7 | Test – 8 | 75 One Liners.
Table of Contents
Questions Section
Que (1): In vulcanisation, with which the natural rubber is heated?
A. Sulphur
B. Nitrogen
C. Chlorine
D. Bromine
Answer: Sulphur.
Que (2): Which is used as a filler in rubber tyres ?
A. Carbon black
B. Foam
C. Sintered metal
D. Engine oil
Answer: Carbon black.
Que (3): Which gas has maximum calorific value?
A. Kerosene
B. Diesel
C. Natural gas
D. A and B
Answer: Natural gas
Que (4): A lighted candle gets extinguished when covered with a tumbler. Why?
A. Because of inadequate supply of air
B. Because of excess supply of air
C. Because of inadequate supply of oxygen
D. Because of excess supply of oxygen
Answer: Because of inadequate supply of air
Que (5): In anaerobic respiration, what is the net gain of ATP per glucose molecule oxidised?
A. 1
B. 2
C. 3
D. 4
Answer: 2.
Que (6): The elements of group VA are generally known as which name?
A. Halogens
B. Radioactive
C. Actinones
D. Pnictogens
Answer: Pnictogens
Que (7): Which gas changes lime water in milky colour?
A. Carbon dioxide
B. Carbon monoxide
C. Nitrogen dioxide
D. Nitrogen monoxide
Answer: Carbon dioxide
Que (8): What does Gobar gas contains mainly?
A. Ethane
B. Methane
C. Propane
D. Butane
Answer: Methane.
Que (9): Which are the important raw materials required in cement industry?
A. Limestone
B. Clay
C. Nitrate
D. A and B
Answer: Limestone and clay.
Que (10): What is not the cause of low conductivity of electrolyte?
A. Freedom of electrons
B. Pentagonal structure
C. Ionisation of salt
D. none of these
Answer: Ionisation of salt
Que (11): Cooking gas is a mixture of which gases?
A. Ethane and propane
B. Ethane and Butane
C. Methane and Propane
D. Butane and Propane
Answer: Butane and propane.
Que (12): Which acid is produced when milk gets sour?
A. Lactic acid
B. Formic acid
C. Acetic acid
D. All of these
Answer: Lactic acid
Que (13): Which are the most commonly used chemicals in the artificial rain making or cloud seeding?
A. Potassium iodide
B. Silver iodide
C. Solid carbon dioxide
D. Liquid propane
Answer: Silver Iodide (Agl).
Que (14): Which compound does not give a positive test in Lassaigne’s test for nitrogen?
A. Sulfate
B. Hydroxide
C. Binary phase
D. Hydrazinc
Answer: Hydrazinc.
Que (15): Litmus paper used in laboratory obtained from?
A. Lichen
B. Gum plant
C. Roots of trees
D. Teak
Answer: Lichen.
Que (16): Which acid is used in synthetic lemonade?
A. Folic acid
B. Citric acid
C. Acetic acid
D. all of these
Answer: Citric acid.
Que (17): A hydrogen atom is paramagnetic. What is a hydrogen molecule?
A. Paramagnetic
B. Diamagnetic
C. no magnetism
D. none of these
Answer: Diamagnetic.
Que (18): Which of the toxic heavy metals is found in modern tannery industries?
A. Chromium
B. Platinum
C. Silver
D. Tin
Answer: Chromium.
Que (19): Why is tetracycline used?
A. In chemotherapy
B. In radiation
C. Anti polio drug
D. As anti-plague drug
Answer: As anti-plague drug.
Que (20): Which contain high content of lead?
A. Solid fuel
B. Liquid fuels
C. Gaseous fuels
D. High octane fuel
Answer: High octane fuel.
Que (21): Denatured spirit is a mixture of ethyl alcohol, methyl alcohol and which other thing?
A. Ethanol
B. Pyridine
C. methylated
D. Methanol
Answer: Pyridine.
Que (22): Which element is in the highest amount in the composition of basalt rock?
A. Cotton
B. Nylon
C. Polythene
D. Silicon
Answer: Silicon.
Que (23): Which fertiliser has more nitrogen content?
A. Human waste
B. Urea
C. Animal waste
D. All of these
Answer: Urea.
Que (24): Food wrapped in newspaper is likely to get contaminated with?
A. Lead
B. Colour
C. Ink
D. All of these
Answer: Lead.
Que (25): If a U-238 nucleus splits into two identical parts, how will the two nuclei be so produced?
A. Stabe
B. Unstable
C. Highly explosive
D. B and C
Answer: Stable.
Other relevant links:
- Chemistry Objective GK Mock Test – 1
- Chemistry Objective GK Mock Test – 2
- Chemistry Objective GK Mock Test – 3
Conclusion:
Hope this article has provided you with some relevant knowledge for your exams. Do let us know in comments if this article is of help or if you want us to cover some other topic.
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