HARD
UPSC CAPF AC Paper - I
IMPORTANT
Earn 100

X-rays are heavily absorbed by lead atoms, but to obtain X-rays photograph of stomach barium sulphate is usually given to the patient instead of lead salt, because_______.

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Important Questions on Physics

HARD
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 3>Q 71
In case of moving source of sound approaching the observer_______.
HARD
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 3>Q 72
X-rays absorption will be maximum for the sheets of_______.
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UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 3>Q 74
The waves used for a communication through artificial satellite are______.
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UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 3>Q 75
Learned Indian classical vocalists do not like the accompaniment of a harmonium because______.
MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 3>Q 76

Velocity of an electromagnetic waves in a medium depends upon _____.

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UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 3>Q 77
Consider the following statements
1. In sound waves, the vibrations are perpendicular to the direction in which the wave travels.
2. Sound waves are elastic waves.
Which of the statement(s) given above is/are correct?
HARD
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 3>Q 78
When an aeroplane attains a speed higher than the speed of sound in air a loud bang is heard, this is because_______.
HARD
UPSC CAPF AC Paper - I
IMPORTANT
14000+ Objective Questions General Studies>Chapter 9 - Physics>Exercise 3>Q 79
When a source of sound is in motion towards a stationary observer, the effect observed is______.