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प्रश्न
Select the correct statement :
(a) A wheel barrow is a lever of class I.
(b) The efficiency of a machine is always 100%
(c) Friction in moving parts of a machine reduces its efficiency.
(d) No lever has the mechanical advantage greater than 1.
(e) It is easier to lift a load vertically up than to push it along an inclined plane.
(f) A screw is made by two inclined planes placed together.
उत्तर
Friction in moving parts of a machine reduces its efficiency.
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संबंधित प्रश्न
Select the correct alternative:
Wheel is used with axle because
What are the wheel and axle? Give two examples.
How does a wheel help in moving the axle?
Name the machine to which the following belong:
Doorknob
State if the following statement is true or false. Correct the statement if it is false.
A rotation spindle tap is an example of a wheel-and-axle arrangement.
Match.
| 1. | Class II lever | Drawing water |
| 2. | Pulley | Bicycle |
| 3. | Class I lever | Nut cracker |
| 4. | Wheel and axle | Wind |
| 5. | Renewable resource | Seesaw |
