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1401. Consider the following statements : 1. Glycerol is used in explosives.2. Detergents are made from hydrocarbons obtained from coal or petroleum3. Sodium perborate is a mild bleaching agent.4. Methanol is used for making synthetic fibres. Which of the statements given above are correct ?
A. 1, 2, 3 and 4
B. 1, 2 and 3
C. 2, 3 and 4
D. 1 and 4
Explanation:
1402. Wood is the main raw material for the manufacture of
A. paint
B. paper
C. ink
D. gun powder
Explanation:
1403. Consider the following statements : 1. Anthydrous sodium carbonate is commonly known as baking soda.2. Baking soda is used in fire extinguishers.3. Bleaching powder is manufactured in Hesenclever plant .Which of the statements given above is/are correct ?
A. 1, 2 and 3
B. 2 and 3
C. 3 only
D. 1 and 2
Explanation:
1404. Electron was first identified by :
A. J.J. Thomson
B. Daniel Rutherford
C. J. Kepler
D. James Chadwick
Explanation:
1405. Which of the following are the discoveries of Einsten ?
A. Radioactivity and photoelectric effect
B. Radioactivity and theory of relativity
C. Theory of relativity and photoelectric effect
D. X-rays and photoelectric effect
Explanation:
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