|
1. Rate of flow of charge through
the surface is known as:
a) Charge b) Electric current
c) Ampere d) Coulomb
|
|
2. The SI unit of current is:
a) Volt b) Coulomb
c) Ampere d) None of these
|
|
4. Free electrons are:
a) Loosely
bound b) Tightly bound
c) Fixed d) None of these
|
|
5. In liquids and gases, the current
is due to the motion of:
a) Positive
charges b) Negative charges
c) Both
positive and negative charges d) None of these
|
|
6. Conventional current (I) is due
to the motion of:
a) Flow of
positive charge b) Flow of negative charge
c) Flow of
neutron d) None of these
|
|
7. The direction of conventional
current in a circuit is:
a) From
negative to positive b) From positive to negative
c) From
negative to negative d) From positive to positive
|
|
8. One advantage of conventional
direction of current is that current flows from:
a) High
potential to low potential b) Low potential to high potential
c) Negative
potential to positive potential d) None of these
|
|
9. The average velocity gained by
the electrons in a conductor placed in an electric field is called:
a) Variable
velocity b) Phase velocity
c) Drift
velocity d) Instantaneous velocity
|
|
|
|
11. Ampere is a current in which charges
flow across any cross-section at the rate of:
a) 2C/S b) 3 CS-1
c) CS-1 d) CS-2
|
|
12. Current per unit area is called:
a) Current
density b) Electric charge
c) Potential
difference d) Resistance
|
|
13. The SI unit of current density is:
a) m2/A b) A/m2
c) m2A d) mA2
|
|
14. If one ampere current flows through
2m long conductor, the charge flow through this in one hour will be:
a) 2 C b) 120 C
c) 3600 C d) 7200 C
|
|
15. The relation V = IR represents:
a) Coulomb’s
law b) Ohm’s law
c) Ampere
law d) None of these
|
|
16. “In an electrical circuit, the
potential difference across a conductor is directly proportional to the current flowing through it, provided the
temperature of the conductor remains the same”. It is known as:
a) Ampere’s
law b) Coulomb’s law
c) Ohm’s law d) None of these
|
Thursday 19 June 2014
Current Electricity Multiple Choice Questions
Thursday 12 June 2014
FBISE SSC-2 Result 2014
The result of federal board is going to be announced very soon. If you want to get more information about the result you can visit www.fbise.com and our facebook page is also giving information about result. If you want your result Just write your roll number in the comment. We will try to give result.
http://entrytestedu.blogspot.com/
Tuesday 10 June 2014
Atomic Nucleus MCQs
|
1. The scientist who discovered
electron from the study of the nature of cathode rays was:
a) Ernest
Rutherford b) Einstein
c) J. J.
Thompson d)
Nile Bohr
|
B
|
|
2. The nuclear model of the atom was
derived partly from experiments involving the scattering of alpha particles performed by:
a) Newton b) Chadwick
c) Rutherford d) Einstein
|
C
|
|
3. Neutrons and Protons in the
nucleus are together called:
a) Atomic
particles b) Mesons
c) Nucleons d) Photons
|
C
|
|
4. The bulk of the mass of an atom
is concentrated in its:
a) Electron
shell b) Neutrons
c) Protons d) Nucleus
|
D
|
|
5. Nuclie having the same nuclear
charge but different masses are called:
a) Isotopes b) Isotones
c) Isomers d) Isobars
|
A
|
|
6. An atom of an element differ from
an atom of one of its isotopes in the number of:
a) Protons
in the nucleus b) Neutrons in the nucleus
c) Electrons
outside the nucleus d) Valence electrons
|
B
|
|
7. A naturally occurring
disintegration involving the emission of high energy electrons is called:
a) Alpha
decay b) Beta decay
c) Gamma
decay d) Sigma decay
|
B
|
|
8. Beta particles are:
a) Hydrogen
nuclei b) Helium nuclei
c) Electrons d) Photons
|
C
|
|
9. A deuteron is:
a) A proton
and neutron bound together b) A type of proton
c) A type of
neutron d) A type of beta particle
|
A
|
|
11. A particle having the mass of an
electron and the charge of a proton is called:
a) Antiproton b) Photons
c) Betatron d) Positron
|
D
|
|
12. Fusion chain reaction are possible
in:
a) A
nuclear reactor b) A linear acceleration
c) Sun and
Stars d) All of the above
|
C
|
|
13. Atomic theory was announced by
Dalton in:
a) 1895 b) 1905
c) 1808 d) 1885
|
C
|
|
14. The electron was discovered by J. J.
Thomson by passing an electric discharge through:
a) A solid b) A liquid
c) A gas at
low pressure d) A gas at high pressure
|
C
|
|
15. Charge on an electron was determined
by:
a) Ampere b) Maxwell
c) Millikan d) Thomson
|
C
|
|
16. Rutherford bombarded a thin sheet of
gold with:
a) a -rays b) gma-rays
c) b-rays d) X-rays
|
C
|
|
17. Proton was discovered by Rutherford
in:
a) 1915 b) 1918
c) 1910 d) 1920
|
D
|
|
18. Chadwick discovered neutron by the
study of scattering of alpha particles from:
a) Gold
foil b) Nitrogen
c) Beryllium d) Oxygen
|
C
|
|
19. Chadwick discovered in 1932:
a) Proton b) Neutron
c) Atom d) Photon
|
B
|
|
20. Neutron was discovered by:
a) Curie b) Roentgen
c) Rutherford d) Chadwick
|
D
|
|
21. Isotopes of an element are atoms
whose nuclei have:
a) The same
atomic number Z but differ in mass A
b) The same
mass number A but differ in atomic number Z
c) The same
number of neutrons but different number of protons d) None of the above
|
A
|
|
22. Charge on neutron is:
a) + 1.6 * 10-19C b) Zero
c) - 1.6 * 10-19C d) 1.2 * 10-19C
|
B
|
|
23. A particle having the mass of an
electron and the charge of a proton is called a:
a) Antiproton b) Positron
c) Gamma
rays d) Photon
|
B
|
|
24. The nucleus consists of:
a) Protons
and neutrons b) Protons and electrons
c) Protons
only d) Electrons and neutrons
|
A
|
|
25. Mass of neutron is:
a) 1.6 * 10-31kg b) 1.6 * 10-27kg
c) 9.1 * 10-31kg d) 1.6 * 10-30kg
|
B
|
|
26. Mass of protons is:
a) 1.6 * 10-27kg b) 1.6 * 10-31kg
c) 9.1 * 10-31kg d) 1.6 * 10-17kg
|
A
|
|
27. 1 amu is equal to:
a) 1.66 * 10-24kg b) 1.66 * 10-19kg
c) 1.66 * 10-34kg d) 1.66 * 10-27kg
|
D
|
|
28. Atoms in an element whose atomic
number are the same but have different mass number are called:
a) Isobars b) Isotons
c) Isotopes d) Isomers
|
C
|
|
29. The nuclei having the same mass
number but different atomic number are called:
a) Isotopes b) Isobars
c) Isotones d) Isomers
|
B
|
|
31. A mass spectrograph (Spectrometer)
sorts out:
a) Molecules b) Atoms
c) Elements d) Isotopes
|
D
|
|
32. The chemical behaviour of an atom is
determined by:
a) Binding
energy b) Number of isotopes
c) Atomic
number d) Mass number
|
C
|
|
33. The mass of a positron is equal to
the mass of:
a) Neutron b) Proton
c) Deutron d) Electron
|
D
|
|
34. Nuclear force is:
a) Attractive
and long range b) Repulsive and long range
c) Attractive
and short range d) None of the above
|
C
|
|
35. The sum of the masses of constituent
nucleons as compared to the mass of the resultant nucleus is:
a) Smaller b) Greater
c) The same d) Sometimes smaller sometimes greater
|
B
|
|
37. The amount of energy required to
break the nucleus is called its:
a) Nuclear
energy b) Kinetic energy
c) Potential
energy d) Binding energy
|
D
|
|
38. The amount of energy equivalent to 1
amu is:
a) 9.315
Mev b) 93.15 Mev
c) 931.5 Mev d) 2.224 Mev
|
C
|
|
39. Radioactivity was discovered by:
a) H.
Becquerel b) Madam Curie
c) Rutherford d) Bohr
|
A
|
|
| |
|
42. Curie is a unit of:
a) Reluctance b) Binding energy
c) Resistivity d) Radioactivity
|
D
|
|
43. The reciprocal of decay constant () of a radioactive elements is:
a) Half
life b) Mean life
c) Total
life d) Curie
|
B
|
|
44. An alpha particle is emitted from 88Ra226
what is the mass and atomic number of the daughter nucleus:
Mass
Number Atomic Number Mass Number Atomic Number
a) 224 84 b) 220 80
c) 222 86 d) 226 87
|
C
|
|
45. alpha-particles are:
a) Hydrogen
nuclei b) Electrons
c) Protons d) Photons
|
B
|
|
46. Gamma rays consist of a stream of:
a) Electrons b) Protons
c) Photons d) Positrons
|
C
|
|
47. Alpha particles are:
a) Electrons b) Hydrogen nuclei
c) Photons d) Helium nuclei
|
D
|
|
48. The rate of decay (disintegration
per unit time) of radioactive substance:
a) Is
constant b) Decreases exponentially with time
c) Varies
inversely as time d)
Decreases linearly with time
|
B
|
|
49. The binding energy per nucleon is:
a) Greatest
for heavy nuclei b) Least for heavy nuclei
c) Greatest
for light nuclei d) Least for medium weight nuclei
|
B
|
|
50. A Curie represents a very strong
source of:
a)
 -particle b)  -particle
c) Radioactivity d)
 -particle |
C
|
|
52. During fission process, a large
amount of:
a) Heat
energy is released b) Nuclear energy is released
c) Electrical
energy is released d) Chemical energy is released
|
B
|
|
53. Controlled fission chain reaction is
maintained in a:
a) Nuclear
reactor b) Linear accelerator
c) Cyclotron d) Stellerator
|
A
|
|
54. Fission chain reaction is controlled
by introducing:
a) Graphite
rods b) Cadmium rods
c) Iron rods d) Platinum rods
|
B
|
|
55. The mass of fissionable material
required for self-sustaining chain reaction is called the:
a) Atomic
mass b) Fermi mass
c) Critical
mass d) Super
critical mass
|
C
|
|
56. First atomic reactor was introduced
by:
a) Rutherford b) Wilson
c) Enrico
Fermi d) Curie
|
C
|
|
57. The moderator used in a nuclear
reactor is:
a) Aluminium b) Sodium
c) Calcium d) Graphite
|
D
|
|
58. The atomic bomb is an example of:
a) Controlled
nuclear fission b) Controlled nuclear fusion
c) Uncontrolled
nuclear fission d) Uncontrolled nuclear fusion
|
C
|
|
59. Tick the correct statement:
a) Moderators
slow down the neutrons b) Moderators absorb the fast neutrons
c) Moderators
reflect the fast neutrons d) Moderators bring the neutrons to rest
|
A
|
|
60. In liquid metal fast breeder
reactor, the type of uranium used is:
a) 92U235 b) 92U238
c) 92U234 d) 92U239
|
B
|
|
61. The process in which two or more
light nuclei combine together to form heavier nuclei with release of energy is called:
a) Fission b) Fusion
c) Chain
reaction d) Chemical reaction
|
B
|
|
62. The source of energy in the sun and
the stars is mainly due to:
a) Fission
reaction b) Fusion reaction
c) Chain
reaction d) Chemical reaction
|
B
|
|
63. Hydrogen bomb is an example of:
a) Nuclear
fission b) Nuclear fusion
c) Chain reaction d) Chemical reaction
|
B
|
|
64. The example of fusion reaction is:
a) The
formation of water from oxygen and hydrogen b) The formation of barium and Krypton from
uranium
c) The
formation of helium from hydrogen d) None of the above
|
C
|
|
65. Materials can be identified by
measuring their:
a) Hardness b) Density
c) Mass d) Half-life
|
D
|
|
66. Radioactivity:
a) is
exhibited more by semiconductors in general
b) in
exhibited more by the elements when they are coupled with other radio-active
elements by a convalent bond
c) is an
atomic property of radioactive elements d) None of these
|
C
|
|
67. In 1819, J. J. Thomson performed
famous experiment relating to the passage of electric current through:
a) Solids b) Liquids
c) Gases d) None of these
|
C
|
|
68. The charge on the electron was
successfully determined by:
a) Bohr in
1908 b) Millikan in 1909
c) Einstein
in 1905 d) Dalton in 1908
|
B
|
|
69. According to Rutherford atomic
model, the positive charge in an atom:
a) is
concentrated at its centre
b) are in
the form of positive electrons at some distance from its centre
c) is spread
uniformly through its volume d) is readily deflected by an alpha particle
|
A
|
|
70. For an atom having atomic number Z
and atomic weight A, the number of neutrons in the nucleus is:
a) A – Z b) A + Z
c) Z d) A
|
A
|
|
71. For an atom having atomic number Z
and atomic weight A, the charge on the nucleus is:
a) A - Z b) A + Z
c) Z d) A
|
C
|
|
72. For an atom having atomic number Z
and atomic weight A, the number of electrons in the atom is:
a) A - Z b) A + Z
c) Z d) A
|
C
|
|
74. Mass of proton is of the order of:
a) 10-31
mg b) 10-27 kg
c) 10-24
g d) All of them
|
D
|
|
75. Charge on proton is:
a) + 1.59
 10-9 C b) + 1.59 10-7 C
c) - 1.59
10-19 C d) + 1.59 10-19 C |
D
|
|
76. Mass defect per nucleon is called:
a) average
energy of nucleons b) binding energy of nucleus
c) packing
fraction of nucleus d) None of these
|
C
|
|
77. The energy of an electron revolving
in the first orbit of hydrogen atom is:
a) -15.4 eV b) -3.4eV
c) +13.6eV d) -13.6eV
|
D
|
|
78. A gram mole of any substance
contains:
a) 6.021
108
atomic nuclei b) 6.022 1016
atomic nuclei
c) 6.022
1023
atomic nuclei d) 6.022 1021
atomic nuclei |
C
|
|
81. The half life of phosphorus -32 is
15 days. A given mass of phosphorus-32 will be reduced to ¼ of its original mass in:
a) 60 days b) 30 days
c) 45 days d) 90 days
|
B
|
|
82. What percent of original radioactive
atoms left after five half lives?
a) 3% b) 5%
c) 10% d) 20%
|
A
|
|
83. Radioactivity is:
a) Self-distruptive
activity b) spontaneous activity
c) exhibited
by all elements under proper conditions d) both ‘a’ and ‘b’
|
B
|
|
84. Gamma rays carry a charge:
a) -e b) +e
c) +2e d) None of these
|
D
|
|
85. Phenomenon of radioactivity is due
to disintegration of:
a) Nucleus b) Neutron
c) Proton d) Molecule
|
A
|
|
86.
-particle carries a charge:
a) -2ve b) +2ve
c) -ve d) +ve
|
C
|
|
87. When a radioactive nucleus emits a
-particle, the proton-neutron ratio:
a) decreases b) increases
c) remains
the same d) none of these
|
B
|
|
88. The reciprocal of decay constant of
a radioactive element is called its:
a) Half
life b) Mean life
c) Total
life d) None of these
|
B
|
|
89. Nuclear reactions can be induced in 92U238
with the bombardment of:
a) Slow
neutron b) Fast neutron
c) Photon d) Graviton
|
B
|
|
90. Electron was discovered by:
a) J. J.
Thomson b) Einstein
c) Rutherford d) Neil Bohr
|
A
|
|
91. Neutrons were discovered by
bombarding alpha particles on:
a) Nitrogen b) Gold
c) Beryllium d) Helium
|
C
|
|
92. The phenomenon of spontaneous
nuclear transformation accompanied by emission of energy is called:
a) Photoelectric
effect b) Compton effect
c) Radioactivity d) Pair production
|
C
|
|
93. Proton was discovered by Rutherford
by bombarding nitrogen with:
a) Alpha
particles b) Beta Particles
c) Gamma
particles d) X-rays
|
A
|
|
94. An apparatus used to determine the
masses of protons, nuclei, ions is:
a) Wilson’s
cloud chamber b) Geiger counter
c) Mass
spectrometer d) Slid state detector
|
C
|
|
95. Which one of the following cannot be
used as moderator:
a) Graphite b) Heavy water
c) Lead d) None of these
|
C
|
|
96. Which one of the following can be
used as neutron arrestor?
a) Graphite b) Heavy water
c) uranium d) Cadmium
|
D
|
|
97. Which one of the following isotopes
of uranium can undergo fission with bombardment of slow neutron:
a) 92U235 b) 92U234
c) 92U238 d) None of these
|
A
|
|
98. Half life of a given sample of
radium is 22 years. The sample will reduce to 25% of its original value after:
a) 11 years b) 22 years
c) 44 years d) 88 years
|
C
|
|
99. According to Rutherford the size of
the nucleus is of order of:
a) 10-15
m b) 10-14 m
c) 10-13
m d) 10-12 m
|
B
|
|
100. In discovery of nucleus Rutherford
bombarded a thin gold foil with fast moving:
a) Beta
particles b) Gamma particles
c) Alpha
particles d) X-rays
|
C
|
|
102. After alpha decay the atomic number of
the atom:
a) increases
by four b) decreases by two
c) increases
by two d) decreases by four
|
C
|
|
103. The half-life of radium is 1600 years.
What is the fraction of radium sample that would survive after 6400 years?
a) 1/2 b) 1/4
c) 1/8 d) 1/16
|
D
|
|
104. Electron was discovered by J.J.
Thomson by passing an electric discharge through:
a) a gas at
low pressure b) a liquid
c) a solid d) a gas at a pressure higher than
atmospheric pressure
|
A
|
|
105. Neutron was discovered by:
a) Chadwick b) Rutherford
c) Neil Bohr
d) Einstein
|
A
|
|
106. Electron was discovered in:
a) 1895 b) 1891
c) 1885 d) 1808
|
B
|
|
107. Radioactivity was discovered by:
a) Rutherford b) Henn Becquad
c) Einstein d) Rontgen
|
B
|
|
108. The charge on electron was discovered
by Millikan in:
a) 1895 b) 1905
c) 1909 d) 1916
|
C
|
|
109. Structure of the nucleus was explained
by:
a) J.J.
Thomson b) Bohr
c) Millikan d) Rutherford
|
D
|
|
110. Rutherford discovered proton in:
a) 1925 b) 1920
c) 1906 d) 1909
|
B
|
|
111. The diameter of an atom is of the
order:
a) 10-125
m b) 10-11 m
c) 10-10
m d) 10-9 m
|
C
|
|
112. An atom of an element differs from an
atom of one of its isotopes in the number of:
a) Neutrons
in the nucleus b) Protons in the nucleus
c) Electrons
outside the nucleus d) Valence electrons
|
A
|
|
113. Nuclei that have the same charge
number but different mass number are called:
a) Isotones b) Isomers
c) Isotopes d) Isobars
|
C
|
|
114. One amu is equal to:
a) 1.66
10-27 kg b) 1.6 10-19 kg
c) 1.66
10-24 kg d) 1.67 10-31 kg |
A
|
|
115. The rate of decay of a radioactive
substance:
a) decreases
exponentially with time b) decreases linearly with time
c) increases
linearly with time d) increases exponentially with time
|
A
|
|
116. Different radioactive materials have:
a) Same
half lives b) Different half lives
c) Same mean
lives d) Same total lives
|
B
|
|
117. The half life of a radioactive element
is 6 min. If the initial count rate is 824 per min, how long will it take to reach count rate
206:
a) 12 min b) 18 min
c) 36 min d) 72 min
|
A
|
|
118. The time required for a radioactive
material to decrease in activity by one half is called:
a) half
time of the material b) Half life of the material
c) Disintegration
time d) Mean life of material
|
B
|
|
120. After alpha decay the mass of the
nucleus:
a) Increases
by four b) Decreases by four
c) Does not
change d) Increases by two
|
B
|
|
121. Neutrons are:
a) Positively
charged b) Negatively charged
c) Massless d) Neutral
|
D
|
|
122. Alpha particles are:
a) Hydrogen
nuclei b) Helium nuclei
c) Lithium
nuclei d) Beryllium nuclei
|
B
|
|
123. Gamma particles are:
a) Photons b) Electrons
c) Neutrons d) Protons
|
A
|
|
124. Beta particles are:
a) Protons b) Electrons
c) Photons d) Neutrons
|
B
|
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