## Physics An electron microscope gives higher magnification than an optical microscope, because :

The velocity of electron is smaller than that of visible light
The electrons have more energy than the light particles
The wavelength of electrons is smaller as compared to the wavelength of visible light
It uses more powerful lenses

Density
Humidity
Pressure
Aridity

## Physics Lightning is produced when

Similar charges of electricity rush towards each other and then get repelled
Clouds strike against impurities in air and the friction burns up these impurities
Strong opposite charges in different clouds break down the resistance offered by the intervening air
Water vapour produces electricity in the clouds

## Physics To open a door easily, the handle should be fixed

In the middle
Away from mid-point opposite to hinges
Near the hinges
None of these

## Physics Which one of the following is not a feature of Indifference Curve?

They do not intersect each other
They slope downwards to the right
They are concave to each other
They are parallel to each other