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91.

When a gas is compressed at constant temperature
(a)The speed of the molecules decrease
(b)The speed of the molecules increase
(c)The collision between the molecules increase
(d)The collision between the molecules decrease
Comment
Answer is: CNA

92.

The rate of evaporation increases with
(a)An increase of surface area
(b)An increase of temperature
(c)A decrease of humidity
(d)All of the above
Comment
Answer is: DNA

93.

Amorphous materials are in fact considered as
(a)Supercooled liquids
(b)Supercooled solids
(c)Covalent network
(d)Molecular crystals
Comment
Answer is: ANA

94.

Phase change from gas to solid is called
(a)Sublimation
(b)Deposition
(c)Fusion
(d)Vaporisation
Comment
Answer is: ANA

95.

Which of the following is a correct statement about proton?
(a)It is nucleus of deuterium
(b)It is an ionised hydrogen atom
(c)It is an ionised hydrogen molecules
(d)It is particle
Comment
Answer is: BNA

96.

The discovery of neutron become very late because
(a)It is present in nucleus
(b)It is fundamental particle
(c)It does not move
(d)It does not carry any charge
Comment
Answer is: DNA

97.

The absolute value of charge on electron was determined by
(a)JJ Thomson
(b)Rutherford
(c)Pristly
(d)RA Millikan
Comment
Answer is: ANA

98.

Which of the recent developments has proved the existence of atoms?
(a)Scanning tunnelling microscopy
(b)X-ray diffraction
(c)Infrared spectroscopy
(d)Mass spectroscopy
Comment
Answer is: ANA

99.

In an atomic nucleus, neutrons and protons are held together by
(a)Gravitational forces
(b)Magnetic forces
(c)Exchange forces
(d)Coulombic forces
Comment
Answer is: DNA

100.

The ratio of specific charge of a proton and α-particle is
(a)2:1
(b)1:1
(c)1:4
(d)1:2
Comment
Answer is: ANA

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