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

19. the most suitable thermometer for measuring the boiling point of water is:

a) Mercury thermometer
b) Alcohol thermometer
c) Bimetallic thermometer
d) Liquid crystal thermometer
e) None of these

Correct answer is Bimetallic thermometer

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)

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


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

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

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

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

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.

42. one of the fundamental characteristics of living organisms is:

a) Photosynthesis
b) Digestion
c) Excretion
d) Metabolism
e) None of these.

Correct answer is Digestion

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