61. The quick healing of a fracture requires a rich supply of:
A. Oxygen
B. Calcium
C. Fats
D. Blood
62. The loudness of sound depends on its:
A) Amplitude
B) Wavelength
C) Frequency
D) None of these
63. The smallest unit of heredity is:
A) Gene
B) Chromosomes
C) Nucleotide
D) DNA
64. What is the mass of a proton?
(A) 1.0073 amu
(B) 1.0087 amu
(C) 5.486×10^-4 amu
D) 6.486 amu
65. Metals can form ions carrying charges?
A) Uni-Positive
B) Di-Positive
C) Tri-Positive
D) All are correct
66. Nelson’s cell is used to prepare caustic soda along with gases. Which gas is produced at the cathode?
(A) Cl2
B) H2
(C) O3
(D) O2
67. Among the following which is not an electrolyte?
(A) Lime solution
(B) Sulphuric acid solution
(C) Sodium chloride solution
D) Sugar solution
68. Mint is an example of which solution?
(A) Gas in liquid
(B) Solid in gas
(C) Gas in solid
D) Liquid in gas
69. Gases are the lightest form of matter and their densities are expressed in the form of?
(A) mg cm^-3
(B) g cm^-3
C) g dm^-3
(D) kg dm^-3
70. _ is an electron-deficient molecule?
(A) NH3
B) BF3
(C) N2
(D) O2
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