Heavy water is
1 Sea water (H2O+Salt)
2 D2O
3 H2O2
4 None of these
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The element found on the surface of the moon is 1 Tin 2 Tungsten 3 Tantalum 4 Titanium
What are quasars?
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Which unit is used to measure sound frequency?
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When an iron nail gets rusted, iron oxide is formed 1 Without any change in the weight of the nail 2 With increase in the weight of the nail 3 With decrease in the weight of the nail 4 None of these
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Which of the following gases is lighter than air? 1 Carbon dioxide 2 Oxygen 3 Ammonia 4 Chlorine