Railway tracks have gaps between them to deal with expansion in:
- (A) Cold days
- (B) Winter
- (C) Hot days
- (D) Snowfall
- (C) Hot days
Which of the following fibers is least harmful to fire?
- (A) Nylon
- (B) Cotton
- (C) Terycott
- (D) Rayon
- (B) Cotton
The planet of the solar system which has maximum number of Moon is:
- (A)Â Jupiter
- (B)Â Venus
- (C)Â Saturn
- (e) None of these
- (C)Â Saturn
Sun is a:
- (A)Â Planet
- (B)Â Comet
- (C) Star
- (D)Â Aurora
- (C) Star
The age of the solar system is:
- (A)Â 4.5 billion years
- (B)Â 5.5 billion years
- (C)Â 6.5 billion years
- (D)Â 7.5 billion years
- (A)Â 4.5 billion years
A unit length equal to the average distance between the Earth and Sun is called:
- (A)Â Light year
- (B)Â Astronomical Unit
- (C)Â Parsec
- (D)Â Parallax
- (B)Â Astronomical Unit
An eclipse of the Sun occurs when:
- (A)Â The Moon is between the Sun and the Earth
- (B)Â The Sun is between the Earth and the Moon
- (C)Â The Earth is between the Sun and the Moon
- (D)Â The Earth casts its shadow on the Moon
- (A)Â The Moon is between the Sun and the Earth
The ozone layer protects the Earth from rays sent down by the Sun:
- (A)Â Ultraviolet rays
- (B)Â Infrared rays
- (C)Â Gamma rays
- (D)Â Radioactive rays
- (A)Â Ultraviolet rays
The ozone layer is present about 30 miles (50 Km) in atmosphere above the Earth. The stratum (layer) of atmosphere in which ozone layer lies is called as:
- (A)Â Exosphere
- (B)Â Mesosphere
- (C)Â Stratosphere
- (D) Ionosphere
- (e) Troposphere
- (C)Â Stratosphere
Which rocks are formed by the alternation of pre-existing rocks by great heat or pressure?
- (A)Â Igneous rocks
- (B)Â Sedimentary rocks
- (C)Â Metamorphic rocks
- (D)Â Acid rocks
- (C)Â Metamorphic rocks