1791. If we multiply force by its duration, what quantity will we get ?

A. Work
B. Energy
C. Impulse*
D. Momentum

1792. What is the time required for half a radioactive susbstance to decay ?

A. Libby factor
B. Bisecting period
C. Half life *
D. Disintegration period

1793. Temperature generally decreases towards the poles because :

A. Air movement is generally towards the equator
B. Cold polar air masses prevent surface heating of the land
C. Cold surface do not absorb solar energy as readily as warm surfaces
D. Progressively lesser solar energy per unit area falls on the earth’s surface as we move to polar regiions *

1794. What part of the stamen of a flower bears the pollen grains?

A. Filament
B. Ovary
C. Anthrium
D. Anther *

1795. What is the casting of a shadow by one celestial body by another ?

A. Eclipse *
B. Precession
C. Atomic number *
D. Charge

1796. Which of the followings tells us how many protons an atom has ?

A. Mass
B. Weight
C. Atomic number *
D. Charge

1797. Biogenies is a term in biology that is derived from two Greek words meaning what ?

A. Life and Death
B. Reproduction and Repair
C. Life and Growth
D. Life and Birth *

1798. Why carbon dioxide is called a “Green house ” gas ?

A. Its concentration is always high in greenhouses
B. It is involved in photosynthesis
C. It absorbs infra-red radiation *
D. It emits visible radiation that is light

1799. Latitude in the sky, marked by circles parallel to the celestial equator is known as what ?

A. Declination *
B. Right Ascension
C. Celestial coordinate system
D. Celestial sphere

1800. The explosion that is said to have begun the universe is called the __:

A. Big bang *
B. Reflection
C. Prism
D. None of the above