General Knowledge : General Science QUESTIONS AND ANSWERS :: part23 : 71 to 75
Following General Knowledge Multiple choice objective type questions and answers will help you in TRB, SSC and UPSC 2014 examinations :
71.Water softening is the process in which : 1. imputities are removed from water 2. dissolved calcium ions are removed from hard water3. dissolved magnesium ions are removed from hard water4. water is boiled for extracting all salts from it |
| 1 and 2 |
| 2 and 3 |
| 1 and 4 |
| 1, 2 and 4 |
72.Which of the following is a non-metal that remains liquid at room temperature ? |
| Bromine |
| Chlorine |
| Helium |
| Phosphours |
73.The mass of the body is different from its weight because : |
| mass varies very little at different places, whereas weight varies a lot |
| mass is a variable quantity, whereas weight is constant |
| mass is a measure of the quantity of matter, whereas weight is force |
| mass is constant but weight increases as the body moves from the Poles to the Equator |
74.Which of the following pairs does not contain a coinage metal ? |
| Copper and Gold |
| Silver and Gold |
| Zinc and Gold |
| Copper and Silver |
75.To achieve high value of rocket velocity, one must have : |
| high exhaust velocity and low loss of mass during porpulsion |
| high exhaust velocity and higher loss of mass during propulsion |
| low exhaust velocity and higher loss of mass dring propulsion |
| non of the above |
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