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Originally Posted by mani1
14. When sound is reflected from floor, ceiling or a wall , it mixes with the original sound and change its complexion, it is called as
a) Sound
b) Echo
c) Reverberation
d) noise
e) None of these
Correct answer is Echo
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Echo is direct reflection of sound
http://en.wikipedia.org/wiki/Echo_(phenomenon)
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20. The density of water is greatest at:
a) 32°C
b) 0°C
c) 4°C
d) 100°C
e) None of these
Correct answer is -32 C (You got the option wrong. It was -32C NOT 32C)
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correct ans 4°C
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21.Which one of the following statements is true:
a) Gases do not conduct heat
b) The best conductors are non-metals
c) Conduction currents occur only in liquids
d) A vacuum can not conduct heat
e) None of the statements is true.
Correct answer is Gases do not conduct heat
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e) None of the statements is true.
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22. Ice can be changed to water by:
a) Adding more water molecules
b) Changing the motion of the water molecules
c) Rearranging the atoms in water molecules
d) Destroying the atoms in water molecules
e) None of these
Correct answer is None of these
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a) Adding more water molecules
not sure
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24. Boiling of an egg is a change which is:
a) Physical
b) Chemical
c) Physiological
d) Morphological
e) None of these
Correct answer is Physical
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b) chemical
physical change is temporary change. boiled egg can't be reversed into liquid state.
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25. The temperature of liquid nitrogen is:
a) -32°C
b) -80°C
c) -100°C
d) -196°C
e) None of these
Correct answer is -80°C
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d) -196°C
Liquid nitrogen - Wikipedia, the free encyclopedia
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26. Which one of the following is an alkali?
a) water
b) vinegar
c) lemon juice
d) slaked lime
e) None of these
Correct answer is vinegar
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e) None of these
alkali are elements of first group Na K etc
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33.Computers can:
a) Add and subtract information only.
b) Add subtract and sort information only.
c) Add subtract sort and classify information.
d) Add and subtract but cannot sort information.
e) Add subtract and sort but cannot classify information.
Correct answer is Add subtract sort and classify information.
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e) Add subtract and sort but cannot classify information.
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43. Plants growing on other plants are called as:
a) Saprophytes
b) Parasites
c) Epiphytes
d) Pathogens
e) None of these.
Correct answer is Epiphytes
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b) Parasites