What is the source of electric energy in an artificial satellite?
The energy generation in stars is due to which one of the following?
The tail of a comet always points away from the Sun due to
Which planet has the maximum number of satellites?
Gamma radiations are used for
Radio Isotopes are
An astronaut on a space walk changes his direction
Bats can fly in the dark because -
a) They have better vision in the dark.
b) The pupils of their eyes are very big.
c) They are guided by ultrasonic waves produced by them.
Echoes are produced due to
A thermostat in a device for
An iron hammer, lying in the sun appears much hotter than its wooden handle because
When a ship enters a sea from a river
Which one of the following is shipyards builds warships for Indian Navy?
18 carat gold is
The amplitude of an earthquake measured 8 on the Richter scale is how many times larger than the one measured 4 on the scale?
Which of the following is/are units of length?
Noise level above which of the following limits can cause death in human beings?
Which one of the following measures the intensity of earthquakes?
Rains sensors fitted on the windshield wipers of some automobiles are based on which of the following principles?
Which one of the following is incorrect about Ultrasound?