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प्रश्न
Observe the picture given in Fig. carefully and answer the following questions.
What is covering the nose and mouth of the police man?
उत्तर
A mask is covering his nose and mouth.
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संबंधित प्रश्न
Suggest five measures to prevent air pollution.
Statement given below is incorrect. Write the correct statement :
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Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
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99%, oxygen, nitrogen, and air, together
