SSC CGL Science – Waves & Sound – Level 3 · Challenge
← Back
Forcing at the natural frequency builds up a large amplitude.
₹299 →
SSC CGL Science – Waves & Sound – 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.
Get daily current affairs & exam alerts – follow us
YouTube
WhatsApp Channel
Telegram Channel
Facebook Page
Instagram
Share with friends & study groups
Link to this page from your website / blog (HTML code)
1.
A SONAR pulse returns 3 s after it is sent. If sound travels at 1500 m/s in water, the depth of the sea is:
Correct Answer: D [2250 m]
Explanation:
Answer: 2250 m. 1500 × 3 / 2 = 2250 m.
2.
Thunder is heard 9 s after a lightning flash. Taking sound at 340 m/s, the storm is about:
Correct Answer: A [3 km away]
Explanation:
340 × 9 = 3060 m ≈ 3 km (one way – no halving).
3.
The wavelength of a 34 kHz ultrasonic wave in air (v = 340 m/s) is:
Correct Answer: B [1 cm]
Explanation:
Answer: 1 cm. λ = 340/34 000 = 0.01 m.
4.
Spot My Mistake“A sound of 10 kHz is ultrasonic because it is above the audible limit of 1000 Hz.” The correct statement is:
Correct Answer: C [10 kHz is audible; ultrasound begins above 20 kHz]
Explanation:
The audible range is 20 Hz – 20 kHz.
5.
A string's pitch can be raised by:
Correct Answer: D [increasing its tension]
Explanation:
Plucking harder changes loudness, not pitch.
6.
A boy stands between two cliffs and hears the first echo after 2 s and the second after 3 s. With sound at 340 m/s, the distance between the cliffs is:
Correct Answer: A [850 m]
Explanation:
Distances 340 m and 510 m → 850 m apart.
7.
The speed of sound in air is NOT affected by a change in:
Correct Answer: A [pressure (at constant temperature)]
Explanation:
v = √(γP/ρ); at fixed T, P/ρ stays constant.
8.
Reverse questionThe answer is “resonance”. Which situation does it describe?
Correct Answer: D [A wine glass shatters when a singer holds a note of the glass's natural frequency]
Explanation:
Forcing at the natural frequency builds up a large amplitude.
➤ 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
› SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Tier II Level · Marathon
› SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Level 3 · Challenge
› SSC CGL Science – Scientific Discoveries, Inventions & Space Technology – Level 2 · Exam Level · Tier I Sprint
Score: 0
Answered: 0 / 0
