This
is our third collection of chemistry multiple choice question with answers
based on measurements and atomic structure if you want to improve your
knowledge about this topic, please read it properly and remember.
is our third collection of chemistry multiple choice question with answers
based on measurements and atomic structure if you want to improve your
knowledge about this topic, please read it properly and remember.
 |
| GK general science |
Chemistry MCQs with Answers) Part 3 (Measurements And Atomic Structures )
General Knowledge – General
Science
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101:
In an atomic nucleus, neutrons and protons are held together by
In an atomic nucleus, neutrons and protons are held together by
A.
gravitational forces
gravitational forces
B.
exchange forces
exchange forces
C.
coulomb forces
coulomb forces
D.
magnetic forces
magnetic forces
Answer: Option B
102:’No
two electrons in an atom can have the same set of four quantum numbers’ is
two electrons in an atom can have the same set of four quantum numbers’ is
A.
Newton’s law
Newton’s law
B.
Bohr’s law
Bohr’s law
C.
Aufbau principle
Aufbau principle
D.
Pauli’s exclusion principle
Pauli’s exclusion principle
Answer: Option D
103:
According to Avogadro’s Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ___ _.
According to Avogadro’s Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ___ _.
A. a
molecule
molecule
B. a
cation
cation
C.
an anion
an anion
D.
an atom
an atom
Answer: Option A
104:
Atoms of an element differ from those of all other elements in
Atoms of an element differ from those of all other elements in
A.
atomic number and electronic configuration
atomic number and electronic configuration
B.
number of neutrons and number of valence electrons
number of neutrons and number of valence electrons
C.
atomic number and number of valence electrons
atomic number and number of valence electrons
D.
number of neutrons and electronic configuration
number of neutrons and electronic configuration
Answer: Option A
105:
Nuclear fission is caused by the impact of
Nuclear fission is caused by the impact of
A.
neutron
neutron
B.
proton
proton
C.
deuteron
deuteron
D.
electron
electron
Answer: Option A
106:
Which of the following rays are more penetrating?
Which of the following rays are more penetrating?
A.
Beta rays
Beta rays
B.
Alpha rays
Alpha rays
C.
Gamma rays
Gamma rays
D.
X-rays
X-rays
Answer: Option C
107:
How many colors the sunlight spectrum has?
How many colors the sunlight spectrum has?
A.
Three
Three
B.
Seven
Seven
C.
Four
Four
D.
Five
Five
Answer: Option B
108:’Bar’
is the unit of
is the unit of
A.
temperature
temperature
B.
heat
heat
C.
atmospheric pressure
atmospheric pressure
D.
current
current
Answer: Option C
109:
One Joule is equal to
One Joule is equal to
A.
105 ergs
105 ergs
B.
103 ergs
103 ergs
C.
107 ergs
107 ergs
D.
1011 ergs
1011 ergs
Answer: Option C
110:
Kilowatt is a unit to measure
Kilowatt is a unit to measure
A.
work
work
B.
power
power
C.
electricity
electricity
D.
current
current
Answer: Option B
111:
Electric current is measured by
Electric current is measured by
A.
commutator
commutator
B.
anemometer
anemometer
C.
ammeter
ammeter
D.
voltmeter
voltmeter
Answer: Option C
112:
Chronometer measures
Chronometer measures
A.
color contrast
color contrast
B.
sound waves
sound waves
C.
time
time
D.
water waves
water waves
Answer: Option C
113:
The light-year is a measurement of
The light-year is a measurement of
A.
speed of airplanes
speed of airplanes
B.
speed of light
speed of light
C.
Stellar distances
Stellar distances
D.
speed of rockets
speed of rockets
Answer: Option C
114:
Very small time intervals are accurately measured by
Very small time intervals are accurately measured by
A.
White dwarfs
White dwarfs
B.
Quartz clocks
Quartz clocks
C.
Atomic clocks
Atomic clocks
D.
Pulsars
Pulsars
Answer: Option C
115:
One kilometer is equal to how many miles
One kilometer is equal to how many miles
A.
0.84
0.84
B.
0.5
0.5
C.
1.6
1.6
D.
0.62
0.62
Answer: Option D
116:
A kilohertz is a unit which measures
A kilohertz is a unit which measures
A.
power used by a current of one ampere
power used by a current of one ampere
B.
electromagnetic radio wave frequencies
electromagnetic radio wave frequencies
C.
voltage
voltage
D.
electric resistance
electric resistance
Answer: Option B
117:
One horsepower is equal to
One horsepower is equal to
A.
746 watts
746 watts
B.
748 watts
748 watts
C.
756 watts
756 watts
D.
736 watts
736 watts
Answer: Option A
118:
What is the unit for measuring the amplitude of a sound?
What is the unit for measuring the amplitude of a sound?
A.
Decibel
Decibel
B.
Coulomb
Coulomb
C.
Hum
Hum
D.
Cycles
Cycles
Answer: Option A
119:
Reading of a barometer going down is an indication of
Reading of a barometer going down is an indication of
A.
snow
snow
B.
storm
storm
C.
intense heat
intense heat
D.
rainfall
rainfall
Answer: Option D
120:
Decibel is the unit for
Decibel is the unit for
A.
speed of light
speed of light
B.
radio wave frequency
radio wave frequency
C.
intensity of sound
intensity of sound
D.
intensity of heat
intensity of heat
Answer: Option C
121:
One fathom is equal to
One fathom is equal to
A. 6
feet
feet
B. 6
meters
meters
C.
60 feet
60 feet
D.
100 cm
100 cm
Answer: Option A
122:
Fathom is the unit of
Fathom is the unit of
A.
sound
sound
B.
depth
depth
C.
frequency
frequency
D.
distance
distance
Answer: Option B
123: A nautical mile is a unit of distance used in
A.
navigation
navigation
B.
road mile
road mile
C.
astronomy
astronomy
D.
measuring the boundaries of a nation
measuring the boundaries of a nation
Answer: Option A
124:
A knot is a unit of speed of which of the following?
A knot is a unit of speed of which of the following?
A.
Airplane
Airplane
B.
Light waves
Light waves
C.
Ship
Ship
D.
Sound waves
Sound waves
Answer: Option C
125:
Electromagnetic radiations produced from nuclear reactions are
Electromagnetic radiations produced from nuclear reactions are
A.
α – rays
α – rays
B.
β – rays
β – rays
C.
x — rays
x — rays
D.
γ – rays
γ – rays
Answer: Option B
126:
The nature of positive rays depends on
The nature of positive rays depends on
A.
The nature of residual gas
The nature of residual gas
B.
The nature of the discharge tube.
The nature of the discharge tube.
C.
The nature of the electrode
The nature of the electrode
D.
All of the above
All of the above
Answer: Option A
127:
Anode rays were discovered by
Anode rays were discovered by
A.
J.J. Thomson
J.J. Thomson
B.
Rutherford
Rutherford
C.
J. Stoney
J. Stoney
D.
Goldstein
Goldstein
Answer: Option D
128:
Which one of the following represents 2p subshell?
Which one of the following represents 2p subshell?
A.
n = 1,L = 0
n = 1,L = 0
B.
n = 1, L = 1
n = 1, L = 1
C.
n = 2, L = 1
n = 2, L = 1
D.
n = 2, L = 0
n = 2, L = 0
Answer: Option C
129:
when 6d orbital is complete, the entering electron goes into
when 6d orbital is complete, the entering electron goes into
A.
7p
7p
B.
7d
7d
C.
7f
7f
D.
7s
7s
Answer: Option A
130:
The most electronegative element is
The most electronegative element is
A.
Fluorine
Fluorine
B.
Bromine
Bromine
C.
Chlorine
Chlorine
D.
Iodine
Iodine
Answer: Option A
131:
When α — particles are sent through a thin metal foil, most of them go straight
through the foil because
When α — particles are sent through a thin metal foil, most of them go straight
through the foil because
A.
α — particles are positively charged.
α — particles are positively charged.
B.
α — particles move with high velocity
α — particles move with high velocity
C.
Most of the space is empty is an atom.
Most of the space is empty is an atom.
D.
All of the above
All of the above
Answer: Option C
132:
The atomic mass of an element is equal to the sum of
The atomic mass of an element is equal to the sum of
A.
Electron and proton
Electron and proton
B.
Electron and neutron
Electron and neutron
C.
Proton and neutron
Proton and neutron
D.
None of the above
None of the above
Answer: Option C
133:
Neutron is a fundamental particle which carries
Neutron is a fundamental particle which carries
A.
No charge and mass of one unit
No charge and mass of one unit
B.
A charge —1 unit and no mass.
A charge —1 unit and no mass.
C.
No charge and no mass.
No charge and no mass.
D.
A charge of +1 and mass of l unit
A charge of +1 and mass of l unit
Answer: Option A
134:
The maximum number of. electrons that can be accommodated by p — orbital is
The maximum number of. electrons that can be accommodated by p — orbital is
A.
10
10
B.
6
6
C.
14
14
D.
2
2
Answer: Option B
135:
Which of the following statement Is wrong about electron
Which of the following statement Is wrong about electron
A.
It is a particle
It is a particle
B.
It has wave-like property
It has wave-like property
C.
It emits energy while moving in orbit.
It emits energy while moving in orbit.
D.
Its motion is affected by the magnetic field.
Its motion is affected by the magnetic field.
Answer: Option C
136:
The nature of cathode rays was identified by
The nature of cathode rays was identified by
A.
William Crook
William Crook
B.
J.J. Thomson
J.J. Thomson
C.
J. Perrin
J. Perrin
D.
Hitiroff
Hitiroff
Answer: Option B
137:
Principle Quantum number describes
Principle Quantum number describes
A.
The orientation of an orbital.
The orientation of an orbital.
B.
Shape of orbital
Shape of orbital
C.
Size of orbital
Size of orbital
D.
Spin of orbital
Spin of orbital
Answer: Option C
138:
Cathode rays are deflected by
Cathode rays are deflected by
A.
Neither electric nor magnetic field.
Neither electric nor magnetic field.
B.
Both electric and magnetic field
Both electric and magnetic field
C.
An electric field only.
An electric field only.
D.
A magnetic field only
A magnetic field only
Answer: Option B
139:
Neutrons were discovered by
Neutrons were discovered by
A.
Faraday
Faraday
B.
J.J. Thomson
J.J. Thomson
C.
Dalton
Dalton
D.
Chadwick
Chadwick
Answer: Option D
140:
The mass of the electron as determined by J.J. Thomson is
The mass of the electron as determined by J.J. Thomson is
A.
9.1 X 10-25 kg
9.1 X 10-25 kg
B.
9.1 X 10 -10gm
9.1 X 10 -10gm
C.
9.1 X 10-31 kg.
9.1 X 10-31 kg.
D.
9.1 X 10 -18gm
9.1 X 10 -18gm
Answer: Option C
141:
If the electronic structure of an oxygen atom is written as 1s2 2s2 2p4 it would
violate
If the electronic structure of an oxygen atom is written as 1s2 2s2 2p4 it would
violate
A.
Hund’s rule
Hund’s rule
B.
Paulis exclusion principle
Paulis exclusion principle
C.
Both Hund’s and Pauli’s principles
Both Hund’s and Pauli’s principles
D.
None of these
None of these
Answer: Option D
142:
Number of nodal planes for f-orbital are
Number of nodal planes for f-orbital are
A.
3
3
B.
2
2
C. 1
D.
0
0
Answer: Option A
143:
One Bohr magneton equals
One Bohr magneton equals
A.
ehc /4π n
ehc /4π n
B. e
c /4hπ m
c /4hπ m
C.
hc /m e4π
hc /m e4π
D.
eh /4π mc
eh /4π mc
Answer: Option D
144:
Three isotopes of an element have mass numbers M, (M + 1) and (M + 2). If the
mean mass number is (M + 0.5) than which of the following ratio may be accepted
for M, (M + 1), (M + 2) in that order.
Three isotopes of an element have mass numbers M, (M + 1) and (M + 2). If the
mean mass number is (M + 0.5) than which of the following ratio may be accepted
for M, (M + 1), (M + 2) in that order.
A.
1: 1: 1
1: 1: 1
B.
4: 1: 1
4: 1: 1
C.
3: 2: 1
3: 2: 1
D.
2: 1: 1
2: 1: 1
Answer: Option B
145:
A possible set of quantum numbers for the last electron added to a gallium atom
(Z = 31) in its ground state is
A possible set of quantum numbers for the last electron added to a gallium atom
(Z = 31) in its ground state is
n l m ms
_______________
A.
4 1 –1 +1/2
4 1 –1 +1/2
B.
4 0 0 –1/2
4 0 0 –1/2
C.
3 2 +2 +1/2
3 2 +2 +1/2
D.
3 0 0 –1/2
3 0 0 –1/2
Answer: Option A
146:
The angle made by the angular momentum vector of an electron with z-axis is
given by
The angle made by the angular momentum vector of an electron with z-axis is
given by
A.
cosθ = l/m
cosθ = l/m
B.
cosθ = √l/m
cosθ = √l/m
C.
cos θ = √[(l+1)/m ]
cos θ = √[(l+1)/m ]
D.
cosθ = m/√l(l+1)
cosθ = m/√l(l+1)
Answer: Option D
147:
The distance between 3rd and 2nd orbit of a hydrogen atom is
The distance between 3rd and 2nd orbit of a hydrogen atom is
A.
2.646 ×10–8 cm
2.646 ×10–8 cm
B.
2.116 ×10–8 cm
2.116 ×10–8 cm
C.
1.058 ×10–8 cm
1.058 ×10–8 cm
D.
0.529 × 10–8 cm
0.529 × 10–8 cm
Answer: Option A
148:
An atom has four unpaired electrons. The total spin of this atom will be
An atom has four unpaired electrons. The total spin of this atom will be
A. 1
B.
1.5
1.5
C. 2
D. 4
Answer: Option C
149:
For a ‘ d ‘ electron, the orbital angular momentum is
For a ‘ d ‘ electron, the orbital angular momentum is
A.
√6 h
√6 h
B.
√2 h
√2 h
C. h
D. 2
h
h
Answer: Option A
150:
Which of the following pairs can form the correct set of isosters?
Which of the following pairs can form the correct set of isosters?
A.
MgS, CaF2
MgS, CaF2
B.
C6H6, B3N3H6
C6H6, B3N3H6
C.
CO, N2O
CO, N2O
D.
All the above
All the above
Answer: Option B
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