31. Most soluble in water is
A. camphor
B. sulphur
C. common salt
D. sugar
✅ The correct answer is option D.
General Science MCQs
32. The average salinity of sea water is
A. 3%
B. 3.50%
C. 2.50%
D. 2%
✅ The correct answer is option B.
33. The variety of coal in which the deposit contains recognisable traces of the original plant material is
A. bitumen
B. anthracite
C. lignite
D. peat
✅ The correct answer is option D.
34. Tetraethyl lead is used as
A. pain killer
B. fire extinguisher
C. mosquito repellent
D. petrol additive
✅ The correct answer is option D.
35. Which of the gas is not known as green house gas?
A. Methane
B. Nitrous oxide
C. Carbon dioxide
D. Hydrogen
✅ The correct answer is option D.
In order, the most abundant greenhouse gases in Earth’s atmosphere are:
In order, the most abundant greenhouse gases in Earth’s atmosphere are:
* water vapor
* carbon dioxide
* methane
* nitrous oxide
* ozone
* chlorofluorocarbons
36. In an atomic nucleus, neutrons and protons are held together by
A. gravitational forces
B. exchange forces
C. coulombic forces
D. magnetic forces
✅ The correct answer is option B.
37. Which of the following shows the masses of the three elementary particles in decreasing order?
A. Leptons, Baryons, Mesons
B. Mesons, Baryons, Leptons
C. Baryons, Mesons, Leptons
D. Leptons, Mesons Baryons
✅ The correct answer is option C.
38. The dark lines in the solar spectrum are due to
A. absorption of corresponding wavelengths by the outer layers of the sun
B. destructive interference between waves of certain definite wavelengths
C. absorption of corresponding wavelengths by the prism used in the photograph
D. absence of corresponding wavelengths from the light emitted by the core of the sun
✅ The correct answer is option A.
39. Atoms of an element differ from those of all other elements in
A. atomic number and electronic configuration
B. number of neutrons and number of valence electrons
C. atomic number and number of valence electrons
D. number of neutrons and electronic configuration
✅ The correct answer is option A.
40. Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
A. Thorium
B. Radium
C. Plutonium
D. Radan
✅ The correct answer is option A.