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Which of the following contains maximum carbon dioxide ?
What is reason for using red light as a stop signal ?
Most plants absorb nitrogen in the form of:
The mountaineers carry oxygen with them because:
The HIV virus affects the:
Tetraethyl lead (TEL) is
Angora wool is extracted from
What is the rarest element on earth?
The time period of a pendulum when taken to the Moon would:
The phenomenon involved in propagation of light waves throuhg optical fibres is :
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