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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 appear-ance of 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 –
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 hyper -metropia, 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 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 bad conductor of electricity because it is
Gamma rays have 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?