Question
What can be the effects of noise pollution on human
health? 1. Damage to the ear and temporary or permanent hearing loss often called ‘a temporary threshold shift’. 2. Irritability, anxiety and stress 3. Lowered worker efficiency and productivity 4. Loss of vision Select the correct answer using the codes given below.Solution
The correct answer is C
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A container has 40 litres  of a mixture of milk and water in the ratio 3 : 1 . How many litres of water  must be added so that the new ratio of ...
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