SSC CGL Science – Motion, Force & Laws of Motion – Tier II Level · Marathon

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SSC CGL Science – Motion, Force & Laws of Motion – Tier II Level · Marathon – 11 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 maximum horizontal range of a projectile thrown at 30 m/s is (g = 10 m/s²):

Correct Answer: C [90 m]

Explanation:

R_max = u²/g = 900/10 = 90 m (at 45°).

2.  
A projectile thrown at 25° has the same horizontal range (same speed) as one thrown at:

Correct Answer: D [65°]

Explanation:

Complementary angles give equal range: 90° − 25° = 65°.

3.  
A ball is projected at 20 m/s at 30° to the horizontal. Its time of flight is (g = 10 m/s²):

Correct Answer: D [2 s]

Explanation:

T = 2u sin θ/g = 2 × 20 × 0.5/10 = 2 s.

4.  
For the same ball (20 m/s at 30°), the maximum height is (g = 10 m/s²):

Correct Answer: C [5 m]

Explanation:

H = u² sin²θ/(2g) = 400 × 0.25/20 = 5 m.

5.  
A 0.5 kg stone tied to a 1 m string is whirled in a horizontal circle at 4 m/s. The tension (centripetal force) is:

Correct Answer: B [8 N]

Explanation:

Answer: 8 N. F = mv²/r = 0.5 × 16/1 = 8 N.

6.  
A 3 kg trolley moving at 8 m/s hits a 5 kg trolley at rest and they move together. Their common velocity is:

Correct Answer: A [3 m/s]

Explanation:

Momentum: 3 × 8 = (3 + 5)v → v = 24/8 = 3 m/s.

7.  
A body starting from rest covers 21 m in the 4th second. Its uniform acceleration is:

Correct Answer: B [6 m/s²]

Explanation:

sₙ = a(2n − 1)/2 → 21 = 7a/2 → a = 6 m/s².

8.  
A body moves at +10 m/s for 4 s and then at −5 m/s for 2 s. Its total distance and displacement are:

Correct Answer: C [distance 50 m, displacement 30 m]

Explanation:

Areas: +40 m and −10 m. Distance adds sizes (50 m); displacement adds signs (30 m).

9.  
Assertion–ReasonAssertion (A): In a lift falling freely, a weighing machine under a man reads zero.
Reason (R): The man and the machine both fall with the same acceleration g.

Correct Answer: A [Both A and R are true and R explains A]

Explanation:

R = m(g − a) with a = g gives zero – both fall together, so there is no push between them.

10.  
A car takes the same circular turn at double the speed. The centripetal force needed becomes:

Correct Answer: D [four times]

Explanation:

Answer: four times. F = mv²/r ∝ v² → 4 times.

11.  
Data tableA cyclist starts from rest. Time (s): 0, 1, 2, 3, 4; distance (m): 0, 2, 8, 18, 32. Her acceleration is:

Correct Answer: D [4 m/s²]

Explanation:

s = 2t² = ½ × 4 × t² for every row → a = 4 m/s² (uniform).

➤ 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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