Radio telescopes are better than optical telescopes because
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
Out of the following pairs, which one does not have identical dimension?
Mercury is commonly used as a thermometric fluid rather than water because
Optical fibre works on the
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
Supersonic plane fly with the speed
Mach number is used in connection with the speed of
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
In this case air blown by the fan will try to push the sail boat in a certain direction.But at the same time due to Newton's third law of motion the fan will experience a force due to the air blown in a direction opposite to the direction in which the sail boat will experience the force due to the blown air.So, as a whole the system will be at rest and it will not move.
Rainbow is due to
Stars which appear single to the naked eye but are double when seen through a telescope are
ML2T-2 is the dimensional formula for
Solar eclipse will take place when
Isotopes of an element contain
One watt-hour is equivalent to
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
In which of the following industries is mica as a raw material?
Radiocarbon dating technique is used to estimate the age of
Identify the vector quantity from the following
Large astronomical telescopes always use as objective
One should not connect a number of electrical appliances to the same power socket because
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
Natural radioactivity was discovered by
Intensity of sound has