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1381. The best conductor of electricity is :
A. filtered hot water
B. distilled water
C. filtered water at room temperature
D. salt water
Explanation:
1382. The emission of an alpha particle from a radioactive element :
A. decrease the mass number of the nucleide by 2
B. decreases the mass number of the nucleide by 4
C. increases the mass number of the nucleide by 2
D. increase the mass number of the nucleide by 4
Explanation:
1383. Permanent hardness of water can be removed by adding :
A. potassium permanganate
B. chlorine
C. bleaching powder
D. washing soda
Explanation:
1384. The emission of Beeta particle :
A. increase the atomic number by one
B. decrease the atomic number by one
C. increases the mass number by one
D. decreases the mass number by one
Explanation:
1385. Which of the following is the best conductor of electricity ?
A. Copper
B. Mica
C. Zinc
D. Silver
Explanation:
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