SSC CGL Science – Work, Energy, Power & Gravitation – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Work, Energy, Power & Gravitation – Level 2 · Exam Level · Tier I Sprint – 15 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.  
The kinetic energy of a 2 kg ball moving at 5 m/s is:

Correct Answer: A [25 J]

Explanation:

Answer: 25 J. ½ × 2 × 25 = 25 J.

2.  
A motor lifts a 100 kg load through 6 m in 20 s. Its useful power output is (g = 10 m/s²):

Correct Answer: C [300 W]

Explanation:

Answer: 300 W. P = mgh/t = 6000/20 = 300 W.

3.  
A 1 kW heater is used for 2 hours every day. Units of electricity consumed in 30 days:

Correct Answer: D [60 units]

Explanation:

Answer: 60 units. 1 kW × 2 h × 30 = 60 kWh.

4.  
If the speed of a body is tripled, its kinetic energy becomes:

Correct Answer: B [9 times]

Explanation:

Answer: 9 times. KE ∝ v² → 3² = 9.

5.  
Match the followingMatch the device with its energy change:
P. Solar cell Q. Loudspeaker R. Microphone S. Electric cell
1. Sound → electrical 2. Chemical → electrical 3. Light → electrical 4. Electrical → sound

Correct Answer: B [P-3, Q-4, R-1, S-2]

Explanation:

Solar cell: light → electrical; loudspeaker: electrical → sound; microphone: sound → electrical; cell: chemical → electrical.

6.  
If the distance between two bodies is halved (masses unchanged), the gravitational force between them becomes:

Correct Answer: D [4 times]

Explanation:

Answer: 4 times. F ∝ 1/r² → (1/2)⁻² = 4.

7.  
A stone is dropped from a height of 125 m. Its speed just before hitting the ground is (g = 10 m/s²):

Correct Answer: A [50 m/s]

Explanation:

Answer: 50 m/s. v = √(2gh) = √2500 = 50 m/s.

8.  
Assertion–ReasonAssertion (A): An astronaut in a spacecraft orbiting the Earth feels weightless.
Reason (R): There is no gravity at the height of the orbit.

Correct Answer: C [A is true but R is false]

Explanation:

Gravity in orbit is still strong (about 90% of surface g for low orbits); weightlessness is due to free fall.

9.  
Odd one outOdd one out (class of lever):

Correct Answer: C [fire tongs]

Explanation:

Tongs are class 3 (effort in the middle); the rest are class 1.

10.  
Arrange in orderArrange in increasing order of g: Earth's pole, centre of the Earth, Earth's equator, surface of the Moon

Correct Answer: A [centre of the Earth < surface of the Moon < Earth's equator < Earth's pole]

Explanation:

0 at the centre < 1.6 (Moon) < 9.78 (equator) < 9.83 m/s² (pole).

11.  
Two-quantity comparisonTwo-quantity comparison (g = 10 m/s²):
Quantity I: KE of a 1 kg ball moving at 4 m/s
Quantity II: PE of a 1 kg ball held 1 m above the ground

Correct Answer: B [Quantity I < Quantity II]

Explanation:

QI = ½ × 1 × 16 = 8 J; QII = 1 × 10 × 1 = 10 J.

12.  
A boy pulls a box 5 m with a force of 20 N along a rope at 60° to the ground. The work done by him is:

Correct Answer: B [50 J]

Explanation:

Answer: 50 J. W = 20 × 5 × cos 60° = 50 J.

13.  
True/false countIn how many of these cases is the work done ZERO?
I. Gravity on a satellite in a circular orbit
II. A man holding a heavy bag without moving
III. Friction on a box sliding on the floor
IV. Gravity on a freely falling stone

Correct Answer: D [2]

Explanation:

I and II are zero. Friction does negative work; gravity on a falling stone does positive work.

14.  
The time period of a geostationary satellite is about:

Correct Answer: C [24 hours]

Explanation:

It matches the Earth's rotation, so it seems fixed in the sky.

15.  
In a lever the effort arm is 60 cm and the load arm is 20 cm. The mechanical advantage is:

Correct Answer: B [3]

Explanation:

MA = effort arm ÷ load arm = 60/20 = 3.

➤ 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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