SSC CGL Science – Work, Energy, Power & Gravitation – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Work, Energy, Power & Gravitation – Level 1 · Warm-up · Tier I Level – 12 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.  
One-line factThe SI unit of work is:

Correct Answer: B [joule]

Explanation:

Work = force × distance → N m = joule.

2.  
NumericalA machine does 1200 J of work in one minute. Its power is:

Correct Answer: A [20 W]

Explanation:

P = W/t = 1200 J ÷ 60 s = 20 W.

3.  
Water stored in a dam possesses:

Correct Answer: D [potential energy]

Explanation:

Energy due to its height (position), mgh.

4.  
One horsepower is approximately equal to:

Correct Answer: C [746 W]

Explanation:

Answer: 746 W. 1 hp ≈ 746 W.

5.  
Odd one out

Correct Answer: A [kilowatt-hour]

Explanation:

kWh is a unit of energy; the other three are units of power.

6.  
When the force on a body is perpendicular to its displacement, the work done is:

Correct Answer: C [zero]

Explanation:

Answer: zero. W = Fs cos 90° = 0.

7.  
The value of the universal gravitational constant G is:

Correct Answer: B [6.67 × 10⁻¹¹ N m² kg⁻²]

Explanation:

Answer: 6.67 × 10⁻¹¹ N m² kg⁻². G = 6.67 × 10⁻¹¹ N m² kg⁻².

8.  
In a solar water heater, the main energy change is:

Correct Answer: D [light energy into heat energy]

Explanation:

Sunlight is absorbed by the black panels and warms the water – light (radiant) energy to heat.

9.  
The weight of a body at the centre of the Earth is:

Correct Answer: D [zero]

Explanation:

Answer: zero. g = g₀(1 − d/R) = 0 at d = R.

10.  
The escape velocity from the Earth's surface is about:

Correct Answer: A [11.2 km/s]

Explanation:

vₑ = √(2gR) ≈ 11.2 km/s (7.9 km/s is the orbital speed).

11.  
Fill in the blankA nutcracker is a lever of the ____ class.

Correct Answer: C [second]

Explanation:

The load (nut) is between the fulcrum (hinge) and the effort.

12.  
Statement-basedConsider the statements:
I. The mass of a body on the Moon is one-sixth of its mass on the Earth.
II. The weight of a body on the Moon is about one-sixth of its weight on the Earth.
Which is/are correct?

Correct Answer: B [Only II]

Explanation:

Mass never changes; weight = mg changes with g (Moon ≈ g/6).

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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