861. Most abundant element in the earth crust is?
A: Hydrogen
B: Nitrogen
C: Oxygen
D: Silicon
862. Robert Hook coined the term?
A: Cell
B: Telephone
C: Battery
D: All of the above
863. System International(SI) unit of pressure is?
A: Joule
B: Ohm
C: Amp
D: Pascal
864. Cataract is the disease of?
A: Lungs
B: Eye
C: Heart
D: Liver
865. Sound waves in the air are called what type of waves?
A: Longitudinal waves
B: Vibrant waves
C: Reversed waves
D: All of the above
866. Study of plant life is called?
A: Zoology
B: Physics
C: Chemistry
D: Botany
867. Study of animals’ life is called?
A: Zoology
B: Chemistry
C: Physics
D: Botany
868. The distance of Mercury from the sun is_____?
A: 57.9 million km
B: 56 million km
C: 58.9 million km
D: 59.1 million
869. Approximate age of the moon is __?
A: 4.55 billion years
B: 4.51 billion years
C: 4.53 billion years
D: 4.57 billion years
870. Which rays are trapped in our galaxy by magnetic waves?
A: Gamma rays
B: Alpha rays
C: Cosmic rays
D: None of these
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