SSC CGL Science – Waves & Sound – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Waves & Sound – Level 1 · Warm-up · Tier I Level – 12 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.  
One-line factSound cannot travel through:

Correct Answer: A [vacuum]

Explanation:

Sound is a mechanical wave; it needs a medium.

2.  
Sound waves in air are:

Correct Answer: C [longitudinal]

Explanation:

Compressions and rarefactions along the direction of travel.

3.  
The SI unit of frequency is:

Correct Answer: D [hertz]

Explanation:

1 Hz = one vibration per second.

4.  
The pitch of a sound depends on its:

Correct Answer: B [frequency]

Explanation:

Higher frequency → higher (shriller) pitch.

5.  
Fill in the blankThe loudness of sound is measured in ____.

Correct Answer: B [decibels]

Explanation:

Answer: decibels. Decibel scale (named after A.

6.  
Sound travels fastest in:

Correct Answer: A [iron]

Explanation:

Answer: iron. Solids > liquids > gases.

7.  
The audible range of the human ear is about:

Correct Answer: D [20 Hz to 20 000 Hz]

Explanation:

Answer: 20 Hz to 20 000 Hz. 20 Hz – 20 kHz.

8.  
Bats find their way in the dark using:

Correct Answer: C [ultrasonic waves]

Explanation:

Answer: ultrasonic waves. Echolocation with ultrasound.

9.  
Odd one outOdd one out (by type of wave):

Correct Answer: B [light]

Explanation:

Light is electromagnetic and transverse; the others are mechanical longitudinal waves.

10.  
Statement-basedConsider the statements:
I. An echo is a reflected sound.
II. An echo can be heard from a wall only 2 m away.
Which is/are correct?

Correct Answer: D [Only I]

Explanation:

A clear echo needs the reflector to be at least about 17 m away.

11.  
SONAR uses:

Correct Answer: A [ultrasonic waves]

Explanation:

Sound Navigation And Ranging – ultrasonic pulses and their echoes.

12.  
The smallest bone in the human body, found in the middle ear, is the:

Correct Answer: C [stapes (stirrup)]

Explanation:

Hammer, anvil, stirrup – the stirrup is the smallest.

➤ 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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