Simple Machines MCQs
Practice Simple Machines multiple-choice questions from Work, Energy, and Simple Machines (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Simple MachinesQuiz - Solve & Score
Q1. Scissors and a seesaw are everyday examples of which simple machine?
- A.the lever
- B.the inclined plane
- C.the pulley
- D.the screw
Answer: A. the lever
Spot-the-setup - a typical physics numerical. We are after the quantity the stem asks for. Tool of choice - F = m*a, V = I*R, n = m/M, v = f*lambda, KE = (1/2) m v^2). Rearrange it for the unknown before substituting. Numbers in: F = m*a, V = I*R, n = m/M, v = f*lambda, KE = (1/2) m v^2). Common-sense check: recall the defining law / equation for the named quantity (e.g. Lock in option A) the lever. Trap-watch: option B) 'the inclined plane' is wrong because An inclined plane is a ramp, not a pivoted bar like scissors/seesaw; option C) 'the pulley' doesn't hold - A pulley uses a wheel and rope, unlike a pivoted lever.
Q2. Why is the useful output of a real ramp slightly less than mgh in practice?
- A.friction between the load and ramp wastes some energy as heat
- B.the ramp creates negative energy
- C.gravity does extra work upward
- D.the load gains mass on the ramp
Answer: A. friction between the load and ramp wastes some energy as heat
Q3. Which change would MOST improve a machine's efficiency?
- A.reducing friction in its moving parts
- B.adding more friction
- C.increasing the load beyond its limit
- D.removing all lubrication
Answer: A. reducing friction in its moving parts
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