Which of the following gas produces pressure in the bottle when baking soda and vinegar are mixed?
a) oxygen
b) nitrogen
c) carbon dioxide
d) methane
Which of the following device gives emergency power to a load when the main power source fails?
a) battery
b) resistor
c) capacitor
d) UPS
Exercise:
Which of the following is NOT a component of soap?
a) glycerine
b) baking soda
c) lye
d) salt
Which substance is used to make milk plastic?
a) baking soda
b) glycerine
c) vinegar
d) borax
What type of mirror is used in solar cooker?
a) plane
b) convex
c) concave
d) flat
