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Q. The blue colour of the water in the sea is due to-
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Q. Optic fibre are mainly used for which of the following?
Q. The weight of a rusted iron object compared to that of an unrusted one is
Q. The purest form of water can be obtained from
Q. In Fraunhofer diffraction the centre of diffraction image is :
Q. Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
Q. Iodized salt is advantageous for
Q. Acid present in gastric juice is
Q. Which one of the following is a working principle of Refrigerator ?
Q. Which of the following one of the following group of gases contribute to the 'Green House Effect'
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