Option “A” is correct Electroplating is the process of plating(depositing) one metal onto another by means of electricity, most commonly for decorative purposes or to prevent corrosion of a metal.
62. Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in –
1. Conduction
2. Convection
3. Radiation
4. Both conduction and convection
Option “B” is correct In the convection process, heat is transferred in the liquid and gases from a region of higher temperature to a region of lower temperature. Convection heat transfer occurs partly due to the actual movement of molecules or due to the mass transfer.
63. Which one of the following polymers is used for making bullet-proof windows?
Option “A” is correct Bullet-resistant glass is made or manufactured by using polycarbonate, thermoplastic and layers of laminated glass.
64. ‘Nobel Oil’ is the name of which one of the following explosives?
1. TNG
2. TNP
3. TNA
4. TNT
Option “A” is correct Tri Nitro Glycerin (TNG) also known as Nobel Oil, is an explosive fluid.
65. Which of the following fossil fuels in the cleanest fuel?
1. Coal
2. Petrol
3. Natural gas
4. Diesel
Option “C” is correct The use of natural gas in power generation provides a cleaner alternative to coal and other fossil fuels.
66. Aspirin is obtained from-
1. Petroleum
2. Earth
3. A tree
4. Chemical reaction of acids
Option “C” is correct Aspirin is a salicylate. It works by reducing substances in the body that cause pain, fever and inflammation. It is obtained from tree.
Option “A” is correct The Bhopal Gas tragedy happened on 2-3 December 1984 at night.
68. Match List – I with List – II and select the correct answer from the code given below:
1. a
2. b
3. c
4. d
Option “A” is correct The correctly matched are as follows: Technology Day – 11 May (Pokharan test 1998) Photography Day -19 August National Sports Day – 29 August (Major Dhyanchand) Nagasaki day – 9 August (Nagasaki Japan atom bomb)
69. Silver gets corroded due to ________________ in air.
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