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Universe and Solar System
A black hole is a —
contracted star with intense gravitational pull
star with very low surface temperature
star with no atmosphere
pulsating star
contracted star with intense gravitational pull
The maximum height over which water can be siphoned at one atmospheric pressure (75 cm of mercury) is
0.75 cm
1.02 m
10.20 m
102 m
10.20 m
An artificial satellite can be tracked very precisely from the earth by using—
Doppler effect
Radar
Sonar
Pulsar
Doppler effect
Which one of the following statements about a satellite orbiting around the Earth is correct?
Satellite is kept in orbit by remote control from ground station
Satellite is kept in orbit by retro-rocket and solar energy keeps it moving around the Earth
Satellite requires energy from solar panels and solid fuels for orbiting
Satellite does not require any energy for orbiting
Satellite does not require any energy for orbiting
Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?
Oxygen
Hydrogen
Nitrogen
Carbon dioxide
Oxygen
Light year is a measure of —
time
distance
total amount of light falling on the Earth in a year
average intensity of light falling on the Earth in a year
distance
How long does light take to reach the Earth from the Sun?
About 4 minutes
About 8 minutes
About 24 minutes
About 24 hours
About 8 minutes
A person can jump higher on the moon's surface than on the earth because
the acceleration due to gravity in moon is smaller than that on the earth
the Moon is cooler than earth
the moon's surface is rough
the moon has no atmosphere
the acceleration due to gravity in moon is smaller than that on the earth
Which of the following is correct regarding light year?
1 Light year = 9.46 x 1015 metre
1 Light year = 9.45 x 1015 metre
1 Light year = 9.44 x 1015 metre
1 Light year = 9.43 x 1015 metre
1 Light year = 9.46 x 1015 metre
The coldest planet in the Solar System is—
Neptune
Jupiter
Mars
Saturn
Neptune