RRB NTPC EXAM Study Notes General Awareness Part 4 #RRB #NTPC

1. Depth of the sea is determined by

A. Chromatography technique

B. SONAR technique

C. Extraction technique

D. Refractometer

ANS:B. SONAR technique

2. ________________ is the cause of bad quality of sound in an auditorium or in public audience.

A. Internal reflection

B. Resonance

C. Reverberation

D. Pulsation

ANS:C. Reverberation

3. The weight of a body is maximum ________________________.

A. at the poles of the Earth.

B. at the equator of the Earth.

C. below the surface of the Earth.

D. above the surface of the Earth.

ANS:A. at the poles of the Earth.

4. Why too much noise is not heard when supersonic aeroplanes are travelling in air ?

A. Their speed is more than the speed of sound

B. Their vibrations are less

C. They travel at greater heights

D. They are light in weight

ANS:C. They travel at greater heights

5. The equipment SONAR is used to determine the

A. Depth of the seabed

B. Intensity of an earthquake

C. Cruising altitude of an aircraft

D. Speed of moving object

ANS:A. Depth of the seabed

6. A milkman puts banana leaf in the jar, because banana leaf

A. Gives a fresh flavour to milk

B. Makes the milk acidic and resistant to yeast

C. Makes the milk basic and resistant to yeast

D. Increases the whiteness of milk

ANS:B. Makes the milk acidic and resistant to yeast

7. Bluetooth technology allows

A. Wireless communication between equipments

B. Signal transmission on mobile phones only

C. Landline to mobile phone communication

D. Satellite television communication

ANS:A. Wireless communication between equipments

8. At high altitudes, pressure cooker is preferable for cooking, because the boiling point of water

A. Reduces due to higher atmospheric pressure

B. Reduces due to lower atmospheric pressure

C, increases due to reduced gravitational force

D. Reduces due to increased ozone content in the atmosphere

ANS:B. Reduces due to lower atmospheric pressure

9. Lightning conductor was discovered by

A. Benjamin Franklin

B. Albert Einstein

C. Issac Newton

D. Michael Faraday

ANS:A. Benjamin Franklin

10. In the microphone used for public address system,

A. Electric signals are first converted into sound waves

B. Sound waves are directly transmitted

C. Amplification is not required at all

D. Sound Waves are converted into electrical signals

ANS:D. Sound Waves are converted into electrical signals