⚙️ Science Quiz
Machines & Simple Machines
200 Questions · Interactive Practice · Class 7–10 Level
⚙️
Welcome to the Machine Quiz Hub
Practice all 200 questions across 8 formats. Click any answer to reveal it. Track your score live. Master every concept before your exam!
📝 MCQ
65
4-option multiple choice
✅ True / False
20
Quick concept checks
✏️ Fill Blanks
20
Type the answer
🔢 Numericals
25
Step-by-step solutions
🔗 Match Column
20
Click to reveal match
💬 Long Answer
20
Exam-style answers
📐 Key Formulas
MA = Load ÷ Effort
VR = d(effort) ÷ d(load)
η = (W_out ÷ W_in) × 100%
Multiple Choice Questions
Questions 1–65 · Select the correct option
True / False
Questions 16–25 + 66–75 · Click True or False
Fill in the Blanks
Questions 26–35 + 76–85 · Type the answer & check
Numerical Problems
Questions 46–50, 96–100, 161–180 · Step-by-step solutions
Match the Following
Questions 101–120 · Click Column B to reveal answer
Assertion – Reason
Questions 121–140 · Click to reveal verdict
Short Answer Questions
Questions 36–45, 86–95, 141–160 · Click + to reveal answer
Long Answer / Exam Questions
Questions 181–200 · Click to expand
Important Formulas & Reference
Quick reference for exams
Mechanical Advantage
MA = Load ÷ Effort
No unit · Can be < 1, = 1, or > 1
Velocity Ratio
VR = d_E ÷ d_L
d_E = distance by effort · d_L = distance by load
Efficiency
η = (W_out ÷ W_in) × 100
Always ≤ 100% in real machines
Efficiency (MA/VR)
η = (MA ÷ VR) × 100
Alternative form
🔑 Key Concepts Cheat Sheet
${[
[‘Simple Machines’, ‘Inclined Plane · Pulley · Wheel & Axle · Lever · Wedge · Screw’],
[‘Complex Machines’, ‘Contain 2+ simple machines. Examples: Bicycle, Crane, Wheelbarrow’],
[‘Fixed Pulley’, ‘MA = 1. Only changes direction of force. No effort reduction.’],
[‘Movable Pulley’, ‘MA = 2. Reduces effort. Used in cranes.’],
[‘Inclined Plane’, ‘Less effort but greater distance. Road ramps, loading docks.’],
[‘Wheel & Axle’, ‘Large wheel + small axle. Steering wheel, door knob.’],
[‘Ideal Machine’, ‘100% efficient. No friction. Only theoretical.’],
[‘Friction Effect’, ‘Reduces efficiency. Converts useful energy to heat.’],
].map(([t,d]) => `
`).join(”)}
${t}
${d}
Live Score
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