SSC CGL Science – Motion, Force & Laws of Motion – Level 3 · Challenge

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SSC CGL Science – Motion, Force & Laws of Motion – Level 3 · Challenge – 8 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 2 kg and 4 kg have equal momentum. The ratio of their kinetic energies (2 kg : 4 kg) is:

Correct Answer: B [2 : 1]

Explanation:

KE = p²/2m; with p equal, KE ∝ 1/m → 4 : 2 = 2 : 1.

2.  
With the same braking force, if the speed of a car is tripled, its braking distance becomes:

Correct Answer: A [nine times]

Explanation:

Answer: nine times. s = u²/(2a) ∝ u² → 3² = 9.

3.  
A ball is thrown vertically upward at 30 m/s. The maximum height it reaches is (g = 10 m/s²):

Correct Answer: B [45 m]

Explanation:

H = u²/(2g) = 900/20 = 45 m; it takes 3 s to reach the top.

4.  
A stone is dropped from a tall cliff. The distance it falls during the 4th second is (g = 9.8 m/s²):

Correct Answer: D [34.3 m]

Explanation:

sₙ = g(2n − 1)/2 = 9.8 × 7/2 = 34.3 m.

5.  
Trick SpotterThe quickest correct way to change 90 km/h to m/s is:

Correct Answer: A [90 × 5/18 = 25]

Explanation:

km/h → m/s: multiply by 5/18 (1 km/h = 1000 m/3600 s).

6.  
A 60 kg man stands on a weighing machine in a lift that accelerates upward at 2 m/s². The machine reads (g = 10 m/s²):

Correct Answer: C [720 N]

Explanation:

R = m(g + a) = 60 × 12 = 720 N.

7.  
Spot My Mistake“I went to the market at 60 km/h and came back by the same road at 30 km/h, so my average speed was 45 km/h.” The correct average speed is:

Correct Answer: B [40 km/h]

Explanation:

Equal distances: 2 × 60 × 30/(60 + 30) = 40 km/h.

8.  
A book rests on a table. Which pair is an action–reaction pair (Newton's third law)?

Correct Answer: A [The Earth pulls the book down; the book pulls the Earth up]

Explanation:

Action–reaction act on different bodies and are the same type of force.

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