Miscellaneous And Useful Chemical Compounds (Part-VI)

31. Electron was discovered in the year 1897 by [S.S.C. Online Graduate Level (T-I) 7.06.2019 (Shift-I)]

(a) J.J. Thomson
(b) T.A. Edison
(c) Nicola Tesla
(d) Isaac Newton

Correct Answer: (a) J.J. Thomson

Solution:The scientist who discovered the electron was J.J. Thomson in 1897. The electron is a negatively charged (1.6 × 10⁻¹⁹ coulomb) particle. J.J. Thomson was awarded the 1906 Nobel Prize in Physics for his discovery.

32. J.J. Thomson received the Nobel Prize in Physics for the discovery of [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-I)]

(a) electrons
(b) neutrons
(c) positrons
(d) protons

Correct Answer: (a) electrons

33. Who among the following is credited with the discovery of Neutrons? [S.S.C. Online CHSL (T-I) 14.10.2020 (Shift-II)]

(a) E. Rutherford
(b) J. Chadwick
(c) J.J. Thomson
(d) James P. Joule

Correct Answer: (b) J. Chadwick

Solution:A neutron is an uncharged particle found in the nucleus of an atom. Its mass is approximately equal to the mass of a proton. Neutron was discovered in the year 1932 by James Chadwick.

34. Who discovered the neutron? [S.S.C. Online MTS (T-I) 5.10.2017 (Shift-I)]

(a) J.J. Thomson
(b) James Chadwick
(c) R.A. Millikan
(d) E. Rutherford

Correct Answer: (b) James Chadwick

Solution:A neutron is an uncharged particle found in the nucleus of an atom. Its mass is approximately equal to the mass of a proton. Neutron was discovered in the year 1932 by James Chadwick.

35. Which of the following drugs has been held largely responsible for nearly wiping out the population of vultures from India? [S.S.C. JE Civil Exam 30.10.2020 (Shift-I)]

(a) Diclofenac
(b) Tylenol
(c) Lunesta
(d) Adderall

Correct Answer: (a) Diclofenac

Solution:The main reason for the decline in the number of vultures in India is the drug Diclofenac, which is given to animals as a pain reliever. While eating the carcasses of dead animals, it used to reach the body of the vultures, causing the death of vultures.

36. Which of the following acid acts as an electrolyte in a lead storage battery? [C.P.O. S.I. 6.06.2016 (Shift-I)]

(a) Sulfuric acid
(b) Lactic acid
(b) Lactic acid
(d) Nitric acid

Correct Answer: (a) Sulfuric acid

Solution:Sulfuric acid is used as an electrolyte in storage batteries. Its chemical formula is H₂SO₄.

37. Which of the following acid is used in lead storage batteries? [S.S.C. Online Stenographer 14.09.2017 (Shift-I)]

(a) Vinegar acid
(b) Sulfuric acid
(c) Hydrochloric acid
(d) Nitric acid

Correct Answer: (b) Sulfuric acid

Solution:Sulfuric acid is used in lead storage batteries with the chemical formula H₂SO₄.

38. A traditional 'battery' contains which of the following chemicals? [S.S.C. Online Graduate Level (T-I) 10.06.2019 (Shift-III)]

(a) Ethanol
(b) Ethylene Glycol
(c) Sodium Bicarbonate
(d) Sulphuric Acid

Correct Answer: (d) Sulphuric Acid

Solution:In a conventional battery, sulfuric acid (H₂SO₄) is used as an electrolyte. In a cell or battery, usually in a solution of dilute sulfuric acid, the current from the copper plate anode travels through the external circuit to the cathode. The cathode is usually a zinc (Zn) plate.

39. Which of the following substances smell like ethanoic acid? [C.P.O. S.I. 6.06.2016 (Shift-I)]

(a) Tomato juice
(b) Kerosene
(c) Vinegar
(d) Lemon

Correct Answer: (c) Vinegar

Solution:Vinegar smells like ethanoic acid. For vinegar, the pH value is usually 2.4 to 3.4. It is used in food and usually contains up to 4-8% acetic acid.

40. Which of the following has a strong fruity fragrance? [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-II)]

(a) Methyl Chloride
(b) Methanol
(c) Ethyl Acetate
(d) Methanoic Acid

Correct Answer: (c) Ethyl Acetate

Solution:Ethyl acetate is a volatile organic liquid compound with a fruity pungent sweet odor.