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Physics

Physics
Speed of sound in air is unaffected by change in

Pressure
Humidity
Volume
Temperature

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Physics
An aircraft can perform aerobatic manoeuvres in a vertical loop because of

Gravity
Centripetal force
Weight
Centrifugal force

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Physics
Resistance of human body in dry condition

1000 ohm
100000 ohm
10000 ohm
10 ohm

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Physics
Curie point is the temperature at which

A metal loses magnetic properties.
Matter becomes radioactive
A metal loses conductivity
Transmutation of metal occurs.

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Physics
Which of the following properties is found only in ferromagnetic materials ?

Hysteresis
Attracting a magnetic substance
Susceptibility independent of temperature
Point in a particular direction

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Physics
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is

Of higher pitch when train departs
The same in both cases in all respects
Of higher intensity when train arrives
Of higher pitch when train arrives

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