Stars are formed in
Ceres
Nebula
Andromeda
None of these
Sun has nine planets . Which is the largest among all of them ?
Neptune
Jupiter
Earth
Saturn
Two stars of different galaxies in the universe move away from each other. Sometimes, two stars of different galaxies may move towards each other in course of time.Which of the following inferences can be drawn from the observation?
Stars repel each other.
Stars attract each other.
Galaxies are expanding.
Galaxies are contracting.
The small celestial objects, known as meteors, burn out as they enter the Earth’s atmosphere.The meteors heat up on entering the earth’s atmosphere because of
rotation of the Earth
magnetic field of the Earth
friction between the meteors and Earth’s atmosphere
gravitational attraction between the meteors and the Earth
The gravitational force between two masses m1 and m2, separated by a distance r, is F. The mass m1 is then reduced to three-fourth of its initial value.
To keep the gravitational force constant without changing m2, the separation r should be
increased to r
decreased to r
The central part at which numerous stars are concentrated is called
Supernova
Perihelion
Galactic bulge
Apastron
The star nearest to the Earth after the Sun is
Regel
Sirius
Betelguesse
Proxima Centauri
The information in which alternative represents the values of a and b?
According to the Big Bang theory, the universe developed from an extremely hot and dense state by an explosion. The Big Bang theory is supported by the
presence of big luminous stars
evidence of the expanding universe
presence of rotating heavenly bodies
scattered positions of the heavenly bodies
The force of gravity is____ force that is ______ proportional to the ______ of the distance between the two given masses.The information in which alternative completes the given statement?
a repulsive, inversely , square
a repulsive, directly, cube
an attractive, inversely , square
an attractive, directly , cube
