Q. Which of the following is likely to reach our body via the food chain in the event of an atomic bomb explosion?
1) U-235
2) Sr-90
3) K-40
4) H-3
Q. Why is phosphorus kept under water ?
1) to make it durable
2) to make it wet
3) to save it from catching fire when exposed to dry air
4) water forms a protective coating on it
Q. Which of the following is widely used as an anaesthetic?
1) methane
2) ammonia
3) chlorine
4) chloroform
Q. Which of the following is not a compound of calcium?
1) gypsum
2) marble
3) chalk
4) silicon
Q. Which of the following is not a chemical action?
1) burning of coal
2) conversation of water into steam
3) digestion of food
4) burning of paper
Q. Which of the following is incorrect?
1) Mercury: Hg
2) Silver: Ag
3) Sodium: Na
4) Potassium: Ka
Q. Which of the following is a protein ?
1) rayon
2) terry cotton
3) natural silk
4) nylon
Q. Which of the following is a preservative for fruit juices?
1) CHsCOONa
2) HCOONa
3) CoHsCOONa
4) C2H5ONa
Q. Which of the following is a non-ferrous metal?
1) cobalt
2) aluminium
3) nickel
4) iron
Q. Which of the following is a mixture?
1) gunpowder
2) iron sulphate
3) brass
4) dry ice
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