Question

Q.2. A) Give scientific reasons.(Any two)
1) There is no alternative to water for cleaning purpose.
2) It is necessary to get the weights and measure standardized at regular intervals.
3). Food remains safe at 5° Celsius.
​

Answer 1

Answer:

3. Food remains safe at 5 degree Celsius as it prevents the growth of bacteria. Explanation: Food is perishable, meaning it tends to deteriorate in quality as time goes by, and it would be unusable after the date of expiry

2. Because of difference in physical conditions from place to place, the reference chosen as units for weights and measures varies. So, it becomes necessary to get the weights and measures standardized at regular intervals.

Answer 2

Explanation:

1)There is no alternative to water for cleaning purposes because it dissolves everything that is added to it. The reason why it is called the universal solvent. ... Also, water has a neutral pH which means it does not harm the object which has to be cleaned and also does not affect the skin.

2) It is not proper to measure quantities by using body parts as units because these are not reliable and unique. These units of measurement vary from person to person. ... So, it becomes necessary to get the weights and measures standardized at regular intervals.

3)Food remains safe at 5 degree Celsius as it prevents the growth of bacteria. Explanation: Food is perishable, meaning it tends to deteriorate in quality as time goes by, and it would be unusable after the date of expiry.