Question
Which technique uses the body's water molecules as the bases for its images?
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| Gas | Atmospheric Air | Alveoli |
| $O_{2}$ | $159$ | $A$ |
| $CO _{2}$ | $0.3$ | $B$ |
$(1)$ Medical termination of pregency $(MTP)$ during first trimester is generally safe
$(2)$ Generally chances of conception are nil until mother breast-feeds the infant upto two years
$(3)$ Intrauterine devices like copper$-T$ are effective contraceptives
$(4)$ Contraception pills may be taken upto one week after coitus to prevent conception Which two of the above statements are correct?