Advertisements
Advertisements
प्रश्न
Select the correct alternative:
For an ideal machine, the efficiency is
विकल्प
greater than unity
less than unity
equal to unity
depends on the value of load
Advertisements
उत्तर
equal to unity
APPEARS IN
संबंधित प्रश्न
State whether the following statement is True or False.
In an ideal machine, work done on load is equal to the work done by effort.
Give two examples of inclined plane where it is used to raise a heavy load with less effort ?
Write the relation between mechanical advantage, velocity ratio and efficiency.
Give an example of the following use of a machine to change the direction of force.
A simple machine enables us to lift a load of 10,000 N by the application of an effort of 500 N. However, when the point of application of the effort moves through 2.5 m, the load gets raised through 10 cm only. What are the values of the:
(i) M.A.
(ii) V.R. and
(iii) Efficiency of the machine?
Classify the following as a lever, a pulley and an inclined plane:
A crane
Which machine will you use to do the following work? Write their type.
To lift bricks to the top of a tall building.
What is meant by simple machines?
Why is this so traveller’s bags have wheels?
______ help us to make work easier.
