Advertisements
Advertisements
प्रश्न
State if the following statement is true or false. Correct the statement if it is false.
There are four types of simple machines.
विकल्प
True
False
Advertisements
उत्तर
False.
There are six types of simple machines.
APPEARS IN
संबंधित प्रश्न
State whether the following statement is True or False.
A boy does work while pushing a wall.
Answer the following in short.
Mention any two methods by which we can take care of machines.
The mechanical advantage of an inclined place is always:
(a) less than 1
(b) equal to 1
(c) greater than 1
(d) nothing can be said
Give scientific reason for the following:
Passengers in a bus are pushed backward when it starts suddenly.
Write an expression to show the relationship between mechanical advantage, velocity ratio, and efficiency for a simple machine.
Define mechanical advantage (M.A.) of the machine.
What is the efficiency of a machine?
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?
Which machine will you use to do the following work? Write their type.
To lift bricks to the top of a tall building.
Name the levers mentioned in the following passage. Identify the fulcrum, load, and effort of each and say which type of lever it is.
Ravi and Savita sit on a seesaw in a garden. In the meantime, a gardener is trimming trees in the garden. He puts the leaves and other garbage in the wheelbarrow. Later, Ravi gets thirsty and he buys lemon sherbet. The sherbet seller cuts the lemon and squeezes it using a lemon squeezer. He puts small pieces of ice in the glass with the help of the tongs.
