The planets visible to us without using a telescope are _____.

A. 3
B. 4
C. 5
D. 6

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1 light year = ?

A. 9.5×106 km
B. 9.5×109 km
C. 9.5×1012 km
D. 9.5×1018 km

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The bodyguard of the Earth is ____ that save the Earth from many Comets and Asteroids.

A. Mars
B. Saturn
C. Uranus
D. Jupiter

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The planet which is easily visible from the Earth is?

A. Mercury
B. Venus
C. Mars
D. Jupiter

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The salinity of sea water is determined by the amount of common salt (Sodium Chloride) in_____ of sea water.

A. 1 gram
B. 10 grams
C. 1 kg
D. 10 kg

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The position of an element in the Periodic Table is determined by its _____number.

A. Electron
B. Proton
C. Neutron
D. Positron

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Blood is cleaned by _____.

A. Lungs
B. Liver
C. Heart
D. Kidneys

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Urine is produced in ______.

A. Kidneys
B. Lungs
C. Large intestine
D. Liver

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At night, Plants intake _____ and release _____.

A. Oxygen – Carbon dioxide
B. Carbon dioxide – Oxygen
C. Oxygen – Carbon monoxide

D. Carbon monoxide – Oxygen

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