Question No : 8
Which of the following is the lightest metal ?
Question No : 9
The element present in the largest amount in rocks and minerals is
Question No : 10
The property of a substance to absorb moisture from the air on exposure is called
Question No : 11
Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere in future?
Question No : 12
The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
Question No : 13
Which of the following is in liquid form at room temperature ?
Question No : 14
Quartz crystals normally used in quartz clocks etc. is chemically