(5) Machines should be Maintainel properly to keep them in good working condition.
3. Which machines will you use to do the following work? Write their types.
Answers
Answer:
Which machines will you use to do the following work? Write their types.
(a) To remove the lid of a tin.
(b) To lift bricks to the top of a tall building.
(c) To cut vegetables.
(d) To draw water from a well.
(e) To hold a papad for roasting it.
ANSWER:
(a) To remove the lid of a tin, we should use an opener which is a second order lever.
(b) To lift bricks to the top of a tall building, we should use a crane which is a pulley.
(c) To cut vegetables, we should use a knife which is a wedge.
(d) To draw water from a well, we should use a pulley system or wheel-axle.
(e) To hold a papad for roasting it, we should use a tong which is a third order lever.
Explanation:
(b) Machines have to be maintained ?
Answer :
(b) A machine is composed of many parts. These parts rub against one another when in use. Due to this, these parts wear out with time. Also, soil and dust creates more friction between the parts which further deteriorates their condition. Even, some parts get affected by weather and thus rust and erode. Because of these factors, the machine can become useless if proper care is not given to it. So, it is very necessary that we have proper equipments and methods for the maintenance of machines. Thus, machines should be sent for maintenance check at fixed interval of time to ensure their proper working.