Question

1.The to and fro motion of an object is called *
1 point
Sound
Vibration
Noise
None of the above
2. In humans the sound is produced by *
1 point
Vibration
Vocal cord
Larynx
None of the above
3. Larynx is also known as *
1 point
Wind pipe
Vocal cord
Voice box
None of the above
4. When air has been removed completely from a vessel it will create *
1 point
Loudness
Vacuum
Both
None of the above
5. A thin stretched membrane at the end of canal is *
1 point
Ear drum
Wind pipe
Larynx
None of the above
6. Vibration is also called *
1 point
Frequency
Amplitude
Oscillatory motion
None of the above
7. The frequency determines the *
1 point
Pitch
Ear drum
Inner ear
None of the above
8. The loudness is expressed in a unit *
1 point
dB
bD
Both
None of the above
9. Human ear cannot detect frequency of *
1 point
Less than 20 HZ
More than 20 HZ
Both
None of the above
10. The ultrasound equipment works at frequencies *
1 point
Higher than 20,000 HZ
Higher than 2000 HZ
Both
None of the above
11. Unpleasant sound is called *
1 point
Noise
Music
Both
None of the above
12. Plantation at rod side can reduce *
1 point
Noise pollution
Water pollution
Noise
None of the above
13. Sound cannot travel through *
1 point
Vacuum
Solid
Liquid
Gas
14. Sound travels through *
1 point
Solid
Liquid
Gas
All of the above
15. Lemon juice is a *
1 point
Conductor
Insulator
Both
None of the above
16. Full form of LED *
1 point
Luminous Emitting Diode
Liquid Emitting Diode
Light Emitting Diode
None of the above
17. Longer led of LED is connected to the *
1 point
Negative terminal
Positive terminal
Both
None of the above
18. Distilled water is a *
1 point
Conductor
Insulator
Partially conductor
All of the above
19. Electroplating was first observed by *
1 point
British chemist
Irish chemist
Indian chemist
None of the above
20. The passage of an electric current to a conducting solution causes *
1 point
Chemical reaction
Physical change
Both
None of the above
21. Most liquid that conduct electricity are solution of *
1 point
Acid
Base
Salt
All of the above
22. Cyclones are *
1 point
Constructive
Destructive
Both
None of the above
23. Lightning is *
1 point
Electrical discharge
Electroplating
Both
None of the above
24. Light charges *
1 point
Repels
Attract
Stagnant
None of the above
25. A device that can be used to test whether an object is carrying charge or not is *
1 point
Electro scope
Electroplating
Electron
None of the above
26. The acquired by a glass rod when it is rubbed with silk as *
1 point
Positive
Negative
Neutral
None of the above
27. In buildings the technique which protect us from electrical shock is *
1 point
Earthing
Lightning
Thundering
None of the above
28. Lightning conductor is used in *
1 point
Building
In clouds
Both
None of the above
29. If thunderstorm occurs there is always a possibility of *
1 point
Lightning
Cyclones
Both
None of the above
30. Earthquake occurs inside *
1 point
Inner core
Outer core
Mantle
Crust​

Answer 1

Answer:

What are you serious how many question

Answer 2

Answer:

vibration

larynx

voice box

vaccum

wind pipe

oscillatory motion

pitch

dB

more than 20 HZ

noise

water pollution