Which of the statements given below are correct?
1. A person having blood group ‘A’ can donate blood to persons having blood group ‘A’ and blood group ‘AB’.
2. A person having blood group ‘AB’ can donate blood to persons having blood groups ‘A’, ‘B’, ‘AB’ or ‘O’.
3. A person with blood group ‘O’ can donate blood to any person having any blood group.
4. A person with blood group ‘O’ can receive blood only from the person of any of the blood groups.
Select the correct answer using the code given below :
1, 2, 3 and 4
1 and 2 only
1 and 3 only
1 and 3 only
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Which among the following events happened earliest ?
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An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
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