Physics
The instrument that measures and records the relative humidity of air is

Hygrometer
Barometer
Hydrometer
Lactometer

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Physics
The bats can fly in the dark because

They have weak legs and are likely to be attacked by predators
They generate flashes of light
They generate ultrasonic sound waves
They can see the objects in darkness

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Physics
To resolve an object in an electron microscope,

Both A & B
The wavelength of the electrons must be greater than the diameter of the object.
None of these
The wavelength of the electrons must be close to the diameter of the object

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The pressure of blood in capillaries is greater than the outside pressure
The pressure at high altitudes is greater than that on the plains
The blood pressure fluctuates and finally decreases drastically
The blood pressure of a person increases at high altitudes

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