Match List I with List II and select the correct answer using the codes given below the Lists: List I I. German Silver II. Solder III. Bleaching Powder IV. Hypo List II

Which one of the following materials is very hard and very ductile?

Aluminium surfaces are often 'anodized'. This means the deposition of a layer of a) chromium oxide b) aluminium oxide c) nickel oxide d) zinc oxide

A small pouch containing silica gel is often found in bottles of medicine in tablet or powder form because silica gel

Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons. Reason (R): Ammonia can be liquified at ambient temperatures at low pressures.

Consider the following statements: Hard water is not suitable for I. drinking. II. washing clothes with soap. III. use in boilers. IV. irrigating crops. Which of these statements are correct?

A rectangular piece of iron sheet measuring 50 cm by 100 cm is rolled into a cylinder of height 50 cm. If the cost of painting the cylinder is Rs. 50 per square metre, then what will be the cost of pa…