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): Which metal is used for making boats because it does not corrode by seawater?
A. Titanium
B. Platinum
C. Iron
D. Ferrous
Answer: Titanium
Titanium resists corrosion by seawater at high temperatures which makes it a good option for marine applications.
Que (2): Which is a strong smelling agent added to LPG cylinder to help in the detection of gas leakage?
A. Ehtyl Mercaptan
B. Methyl Mercaptan
C. Propyl Mercaptan
D. Butyl Mercaptan
Answer: Ethyl Mercaptan
Ethyl mercaptan has pungent garlic like odour which makes gas leakage easy to detect.
Que (3): Which was the The first atomic power reactor in India?
A. Trishul
B. Barack 8
C. Apsara
D. none of these
Answer: Apsara
Apsara reactor became operational in 1956 and was shot down in 2010. it is located in BARC, Mumbai.
Que (4): Which of the element of group 17 is radioactive?
A. Fluorine
B. Bromine
C. Chlorine
D. Astatine
Answer: Astatine
Its highly radioactive and requires special handling techniques and precautions.
Que (5) Which has the least penetrating power?
A. Alpha particles
B. Beta particles
C. Gama particles
D. none of these
Answer: Alpha particles
Large mass of alpha particles makes them less able to penetrate matter.
Que (6): Most of the explosions in mines occur due to the mixing of things?
A. Oxygen
B. Acetyline
C. Titanium
D. A and B
Answer: Oxygen with acetylene.
Que (7): Glass is made of the mixture of which things?
A. Sand
B. Silicates
C. Plastic
D. A and B
Answer: Sand and silicates.
Que (8): Electron emitted from which orbit radiates beta radiation?
A. Inner orbits of atoms
B. Only the first two orbits
C. Only the last orbit
D. Atoms with complete orbits only
Answer: Inner orbits of atoms.
Que (9): Which chemically inactive gas present in the atmosphere?
A. Argon
B. Neon
C. Xenon
D. Renon
Answer: Argon
The outermost shell of argon has 8 electrons or complete outer electron shells making it exceedingly stable.
Que (10): By whom was the absolute value of charge on electron determined?
A. CV Raman
B. Chandra Ray
C. RA Milikan
D. Birbal Sahni
Answer: R.A.Milikan
In 1910 Robert Andrew Milikan determined the magnitude of the electron’s charge.
Que (11): From which electrode the cathode ray particles originate in a discharge tube?
A. Cathode
B. Anode
C. In the residue
D. All of these
Answer: Cathode.
Que (12): Which element has two electrons in the K-shell only?
A. Nitrogen
B. Helium
C. Hydrogen
D. Oxygen
Answer: Helium.
Que (13): Major part of CO2 is transported to respiratory surface in form of which ion?
A. HCO3 ion
B. HCO2 ion
C. HCO ion
D. HCO4 ion
Answer: HCO3 ion.
Que (14): Which type of isomerism is shown by diethyl ether and methyl propyl ether?
A. Consittutional
B. Stereoisomers
C. Enantiomers
D. Metamerism
Answer: Metamerism
I.e. two objects shows same color under a particular light by have different spectral energy.
Que (15): Which allotrope of the carbon is used in cutting and drilling?
A. Lead
B. Platinum
C. Diamond
D. Steel
Answer: Diamond
Diamond because of its hardness is used in cutting applications.
Que (16): Which element is essentials for the transmission of impulses in the nerve fibre?
A. Calcium
B. Protein
C. Minerals
D. Oxygen
Answer: Calcium.
Que (17): In certain amino acids, which elements is found in addition to carbon, hydrogen, nitrogen and oxygen?
A. Fluorine
B. Sulphate
C. Sulphur
D. Hydrate
Answer: Sulphur.
Que (18): Which substance coated on plastic tape?
A. Iron Oxide
B. Petrol
C. Plastic
D. Silicon
Answer: Iron oxide.
Que (19): X210 has half life of 5 day. What is the time taken for seven-eights of sample of X210 to decay?
A. 15 Days
B. 14 Days
C. 12 Days
D. 10 Days
Answer: 15 days.
Que (20): A gas is found to have the formula (CO)n. Its vapour density is 70. What must the value of n be?
A. 3
B. 2
C. 8
D. 5
Answer: 5.
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.
Thanks.
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