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The period of revolution of a geostationary satellite is:
A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously?
A rocket works on the principle of conservation of:
The frequency of ultrasound wave is typically:
Optical fibres are based on the phenomenon of:
‘Mirage’ is an example of:
The phenomenon of light associated with the appearance of the blue colour of the sky is:
The time period of a pendulum when taken to the Moon would:
The atmospheric air is held to the Earth by:
The function of ball bearings in a wheel is:
‘Shock-absorbers’ are usually made of steel as it:
Which of the following could be used as fuel in propellant or rockets?
Lambert’s law is related to:
One can distinguish a telescope from a microscope by observing:
The sound produced by a bat is:
When a bar magnet is cut into two equal halves, the pole strength of each piece:
An electrostatic precipitator is used to control:
The time period of a seconds pendulum is:
Lakes freeze in cold countries in winter, leaving the water underneath at:
Which one of the following determines the sharpness of image in a camera?
For a person having hypermetropia, the near point is:
Amount of water vapour in the atmosphere is measured in terms of:
Name the process of production of energy in the Sun:
A spherical ball made of steel when dropped in a mercury container will:
The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as:
Eclipses occur due to which optical phenomena?
Pure water is a bad conductor of electricity because it is:
Gamma rays have the greatest similarity with:
The filament of electric bulb is made up of:
When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to:
A piece of wood is held under water. The upthrust on it will be:
In a photocell light energy is converted into:
Among the following materials sound travels fastest in:
Which phenomenon do bats or dolphins use to find prey, predators or obstacles?