Which of the following is used to kill the germs without harming to skin?
a)sanitizer
b) soap
c) salt
d) water
Which of the following is/are used to make homemade sanitizer?
a) alcohol
b) aloe Vera gel
c) oil
d) all of these
Which of the following alcohol is commonly used to make sanitizer?
a) methanol
b) ethanol
c) propanol
d) none of these
Explanation:To get one cup of sanitizer, combine ⅓ cup of gel or glycerin with ⅔ cup of rubbing alcohol. Mix thoroughly with your spoon or whisk to ensure that the alcohol is evenly distributed throughout the gel. Stir in five drops of an essential oil, if you're using it.
Exercise:
The percentage of fresh water on earth is not more than only…….
a)2%
b) 30%
c) 20%
d) 25%
Drip irrigation system is useful for agriculture because it allows water to……..
a)reach the roots directly
b)spread equally
c) sprinkles water
d) evaporate
