MCQOPTIONS
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| 1. |
A rocket can go vertically upwards in earth's atmosphere because [CPMT 1980] |
| A. | It is lighter than air |
| B. | Of gravitational pull of the sun |
| C. | It has a fan which displaces more air per unit time than the weight of the rocket |
| D. | Of the force exerted on the rocket by gases ejected by it |
| Answer» E. | |