61. Paper is manufactured by September 19, 2025 by Admin A. Wood and resin B. Wood, sodium and bleaching powder C. Wood, calcium, hydrogen sulphite and resin D. Wood and bleaching powder ✅ The correct answer is option C.
62. Very small time intervals are accurately measure by September 19, 2025 by Admin A. White dwarfs B. Quartz clocks C. Atomic clocks D. Pulsars ✅ The correct answer is option C.
63. Electric current is measure by September 19, 2025 by Admin A. commutator B. anemometer C. ammeter D. voltmeter ✅ The correct answer is option C.
64. Rayon is chemically September 19, 2025 by Admin A. cellulose B. pectin C. glucose D. amylase ✅ The correct answer is option A.
65. One Joule is equal to September 19, 2025 by Admin A. 105 ergs B. 103 ergs C. 107 ergs D. 1011 ergs ✅ The correct answer is option C.
66. kilohertz is a unit which measures September 19, 2025 by Admin A. power used by a current of one ampere B. electromagnetic radio wave frequencies C. voltage D. electric resistance ✅ The correct answer is option B.
67. Which metal pollute the air of a big city? September 19, 2025 by Admin A. Copper B. Chromium C. Lead D. Cadmium ✅ The correct answer is option C.
68. Actinides are the elements with atomic numbers from September 19, 2025 by Admin A. 97 to 104 B. 101 to 115 C. 89 to 103 D. 36 from 43 ✅ The correct answer is option C.
69. Sodium metal is kept under September 19, 2025 by Admin A. petrol B. alcohol C. water D. kerosene ✅ The correct answer is option D.
70. The element common to all acids is September 19, 2025 by Admin A. hydrogen B. carbon C. sulphur D. oxygen ✅ The correct answer is option A.