SSC CGL Science – Work, Energy, Power & Gravitation – Level 3 · Challenge
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A fixed pulley and an equal-arm lever have MA = 1; a movable pulley has MA = 2.
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SSC CGL Science – Work, Energy, Power & Gravitation – Level 3 · Challenge – 9 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
Two bodies of masses 1 kg and 4 kg have equal kinetic energies. The ratio of their momenta (1 kg : 4 kg) is:
Correct Answer: D [1 : 2]
Explanation:
p = √(2m KE) ∝ √m → √1 : √4 = 1 : 2.
2.
If the speed of a car increases by 10%, its kinetic energy increases by:
Correct Answer: A [21%]
Explanation:
Answer: 21%. (1.1)² = 1.21 → 21%.
3.
A planet has twice the mass and twice the radius of the Earth. A 60 kg man who weighs 600 N on the Earth weighs on this planet:
Correct Answer: C [300 N]
Explanation:
Answer: 300 N. g ∝ M/R² → 2/4 = ½ → 300 N.
4.
At a height equal to twice the Earth's radius above the surface, the value of g becomes:
Correct Answer: A [g/9]
Explanation:
Distance from the centre = 3R → g' = g R²/(3R)² = g/9.
5.
Spot My Mistake“A kilowatt-hour measures how fast electricity is used, so it is a unit of power.” The correct statement is:
Correct Answer: B [kWh is a unit of energy equal to 3.6 × 10⁶ J]
Explanation:
Power × time = energy; 1 kW × 1 h = 3.6 × 10⁶ J.
6.
A ball dropped from 5 m rebounds to a height of 3.2 m. What percentage of its mechanical energy is lost in the bounce?
Correct Answer: D [36%]
Explanation:
Energy ∝ height: 3.2/5 = 0.64 remains → 36% lost.
7.
Reverse questionWhich device converts chemical energy into electrical energy?
Correct Answer: C [Electric cell]
Explanation:
A cell's chemical reactions drive the current; a solar cell uses light.
8.
Trick SpotterFour 100 W bulbs glow 5 hours a day. Using units = watts × hours × days ÷ 1000, the units used in 30 days are:
Correct Answer: A [60 units]
Explanation:
400 × 5 × 30 ÷ 1000 = 60 units.
9.
Odd one outOdd one out (simple machines that give a mechanical advantage of exactly 1):
Correct Answer: D [movable pulley]
Explanation:
A fixed pulley and an equal-arm lever have MA = 1; a movable pulley has MA = 2.
➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science
📘 SSC CGL 2026 – General Science (Tier I + Tier II)
Here you get the answer with a one-line explanation. 1,110 original questions with answer key and explanations · mind-maps, notes, tables and shortcuts · Tier I and Tier II practice sets + 3 mock tests
Get the book – ₹149 More quizzes
› SSC CGL Science – Mock Test 3 – Tier II Style
› SSC CGL Science – Mock Test 2 – Tier I Style
› SSC CGL Science – Mock Test 1 – Tier I Style
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› SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Level 3 · Challenge
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