A quick 25 questions article on Chemistry – General Knowledge – MCQs important for competitive exams like in UPSC, state civil services, olympiads etc.
Que (1): Which metal is used for making boats because it does not corrode by seawater?
Titanium resists corrosion by seawater at high temperatures which makes it a good option for marine applications.
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?
B. Barack 8
D. none of these
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?
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?
D. A and B
Answer: Oxygen with acetylene
Que (7): Glass is made of the mixture of which things?
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?
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
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?
C. In the residue
D. All of these
Que (12): Which element has two electrons in the K-shell only?
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?
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?
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?
Que (17): In certain amino acids, which elements is found in addition to carbon, hydrogen, nitrogen and oxygen?
Que (18): Which substance coated on plastic tape?
A. Iron Oxide
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?
Other relevant links:
- Chemistry Objective GK Mock Test – 1
- Chemistry Objective GK Mock Test – 2
- Chemistry Objective GK Mock Test – 3
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.