Fill in the blanks with missing words:
The heat produced by friction can be used for __________ a matchstick.
Fill in the following blank with a suitable word: The amount of heat produced by burning a unit mass of a fuel completely is known as its ................ value.
Fill in the following blanks with suitable words: (a) A current is a flow of ... For this to happen there must be a ...circuit. (b) Current is measured in .... using an ..... placed in .... in a circuit.
Fill in the blanks:
(a) Burning of wood and coal causes _______ __ of air.
(b) A liquid fuel used in homes is ___________.
(c) Fuel must be heated to its ___________ before it starts burning.
(d) Fire produced by oil cannot be controlled by ________ _.
Question 1 (a) Fill the missing word in the blank spaces in the following statements: (a) Wind is ––––– air.
A force may sometimes only _________ to produce motion.