Same chapter2 marksDifficulty: Easy
Define mechanical advantage, velocity ratio and efficiency of a machine.
Machines
2 marksDifficulty: Easy
State the class of lever to which a pair of scissors belongs and give one reason for your answer.
Original Khojo Papers practice question — not from a past board paper.
Answer
A pair of scissors is a class I lever because the fulcrum (the rivet) lies between the effort applied by the hand and the load offered by the material being cut.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
In a class I lever the fulcrum lies between the effort and the load.
Related questions
From the same topic and chapter, at a similar level.
Same chapter1 markDifficulty: Easy
The velocity ratio of a single movable pulley is:
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In a machine the effort moves 5 m while the load moves 1 m. Calculate the velocity ratio.
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Same chapter4 marksDifficulty: Hard
A machine has a velocity ratio of 6 and an efficiency of 80%. Calculate the mechanical advantage and the effort needed to raise a load of 480 N.
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Same chapter3 marksDifficulty: Medium
Why is the efficiency of a practical machine always less than 100%?
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