1 Which of the following is necessary for the formation of hemoglobin ?   1 Iron 2 Salt 3 Phosphorous 4 Sulphur   Answer: Option1

2 The two elements that are frequently used for making transistors are   1 boron and aluminium 2 silicon and germanium 3 iridium and tungsten 4 niobium and columbium   Answer: Option2

3 Bleaching powder is made from —   1 Sulphur dioxide and gypsum 2 Chlorine and Charcoal 3 Soda ash and lime 4 Lime and Chlorine   Answer: Option4

4 In which of the following activities silicon carbide is used?   1 Making cement and glass 2 Disinfecting water of ponds 3 cutting very hard substances 4 Making casts for statues   Answer: Option3

5 An alloy used in making heating elements for electric heating devices is —   1 Solder 2 Alloysteel 3 Nichrome 4 German Silver   Answer: Option3

6 Which of the following does not contain a coinage metal?   1 Silver and Gold 2 Zinc and Gold 3 Copper and Silver 4 Copper and Gold   Answer: Option2

7 Which of the following is a non-metal that remains liquid in room temperature ?   1 Bromine 2 Chlorine 3 Helium 4 Phosphorus   Answer: Option1

8 The fastest acting enzyme in the biological kingdom is–   1 lipase 2 amylase 3 carboxypeptidase 4 carbonic anhydrase   Answer: Option4

9 Palaeobotany is the branch of botany is which we study about–   1 Animal fosills 2 Plant fossils 3 Seed of plant 4 Flower   Answer: Option2

10 Which of the following are the ingredients of gun metal?   1 Iron, Zinc, Titanium 2 Iron, tin 3 Iron, Brass, Tin 4 Copper, Tin   Answer: Option4