SSC CGL Science – Waves & Sound – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Waves & Sound – 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.  
A wave has frequency 200 Hz and wavelength 1.7 m. Its speed is:

Correct Answer: D [340 m/s]

Explanation:

Answer: 340 m/s. v = f λ = 200 × 1.7.

2.  
The time period of a wave of frequency 50 Hz is:

Correct Answer: A [0.02 s]

Explanation:

Answer: 0.02 s. T = 1/50.

3.  
A person hears the echo of his shout from a hill 3 s later. If sound travels at 340 m/s, the hill is:

Correct Answer: B [510 m away]

Explanation:

Answer: 510 m away. 340 × 3 / 2 = 510 m.

4.  
Match the followingMatch the column:
P. Loudness Q. Pitch R. Quality S. Speed
1. Waveform 2. Amplitude 3. Medium 4. Frequency

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

Explanation:

A-L, F-P, W-Q; speed depends on the medium.

5.  
Assertion–ReasonAssertion (A): We see the flash of lightning before we hear the thunder.
Reason (R): Light travels much faster than sound.

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

Explanation:

3 × 10⁸ m/s against about 343 m/s.

6.  
When sound passes from air into water, which quantity does NOT change?

Correct Answer: B [frequency]

Explanation:

Frequency is fixed by the source.

7.  
Arrange in orderArrange in increasing order of speed of sound: iron, air, water, hydrogen

Correct Answer: D [air < hydrogen < water < iron]

Explanation:

Air 343 < hydrogen 1284 < water ≈ 1500 < iron ≈ 5950 m/s.

8.  
Two-quantity comparisonTwo-quantity comparison (same tuning fork):
Quantity I: wavelength of its sound in air
Quantity II: wavelength of its sound in water

Correct Answer: B [Quantity I < Quantity II]

Explanation:

Same f; λ = v/f and v(water) > v(air).

9.  
True/false countHow many of these are uses of ultrasound?
I. Scanning a baby before birth
II. Imaging the heart
III. Detecting cracks in metal blocks
IV. Photosynthesis

Correct Answer: C [3]

Explanation:

I, II and III use ultrasound; photosynthesis uses light.

10.  
A person on a platform hears the horn of a passing express train drop to a lower pitch as the train moves away. This is due to:

Correct Answer: C [the Doppler effect]

Explanation:

A source moving away spreads its waves out – a lower frequency is heard.

11.  
Curtains, carpets and soft seats are used in auditoriums to reduce:

Correct Answer: B [reverberation]

Explanation:

They absorb sound and cut repeated reflections.

12.  
Diagram-basedThe graphs show two sound waves P and Q over the same time interval. Which statement is correct?

Correct Answer: A [Q has the higher pitch; both are equally loud]

Explanation:

Q makes twice as many vibrations (higher frequency); the amplitudes are equal.

13.  
On a cool morning sound travels at 330 m/s. Taking the persistence of hearing as 0.1 s, the least distance of a cliff for a clear echo is:

Correct Answer: D [16.5 m]

Explanation:

Round trip in 0.1 s: d = 330 × 0.1 / 2 = 16.5 m.

14.  
A stethoscope works on the principle of:

Correct Answer: C [multiple reflection of sound]

Explanation:

Sound of the heartbeat is reflected repeatedly along the tube.

15.  
Elephants and whales communicate using:

Correct Answer: B [infrasound]

Explanation:

Answer: infrasound. Frequencies below 20 Hz.

➤ 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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