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question_answer1)
Cathode rays are made up of
A)
positively charged particles done
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B)
negatively charged particles done
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C)
neutral particles done
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D)
none of these done
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question_answer2)
The value of Planck's constant is
A)
\[\text{6}.\text{6256}\times \text{1}{{0}^{-\text{27}}}\text{erg sec}\] done
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B)
\[\text{66}.\text{256}\times \text{1}{{0}^{-\text{27}}}\text{ erg sec}\] done
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C)
\[\text{6}.0\text{2}\times \text{1}{{0}^{-\text{15}}}\text{ erg sec}\] done
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D)
\[\text{3}.0\text{1}\times \text{l}{{0}^{-\text{23}}}\text{ erg sec}\] done
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question_answer3)
The electronic configuration 2, 8, 8, 2 represents the element
A)
argon done
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B)
potassium done
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C)
calcium done
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D)
chlorine done
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question_answer4)
Rutherford's experiment which established the nuclear model of the atom used a beam of
A)
\[\beta \]- particles which impinged on a metal foil and got absorbed done
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B)
\[\gamma \]- rays which impinged on a metal foil and ejected electrons done
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C)
Helium atoms, which impinged on a metal foil and got scattered done
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D)
Helium nuclei, which impinged on a metal foil and got scattered done
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question_answer5)
A neutral atom of an element has a nucleus with a nuclear charge 13 times and mass 27 times that of hydrogen nucleus. How many electrons would be in its stable positively charged ion?
A)
27 done
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B)
14 done
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C)
13 done
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D)
10 done
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question_answer6)
An element M has an atomic mass 19 and atomic number 9; its ions are represented by
A)
\[{{\text{M}}^{+}}\] done
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B)
\[{{\text{M}}^{2+}}\] done
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C)
\[{{\text{M}}^{-}}\] done
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D)
\[{{\text{M}}^{\text{2}-}}\] done
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question_answer7)
When alpha rays are sent through a thin metal foil, most of them go straight through the foil because
A)
alpha rays are much heavier than electron rays done
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B)
alpha rays are positively charged done
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C)
alpha rays move with high velocity done
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D)
most part of the atom is empty done
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question_answer8)
Rutherford's alpha ray scattering experiment eventually led to the conclusion that
A)
mass and energy are related done
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B)
electrons occupy space around the nucleus done
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C)
neutrons are buried deep in the nucleus done
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D)
the point of impact with matter can be precisely determined done
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question_answer9)
Which of the following is not isoelectronic?
A)
\[\text{N}{{\text{a}}^{+}}\] done
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B)
\[M{{g}^{2+}}\] done
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C)
\[{{\text{O}}^{\text{2}-}}\] done
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D)
\[C{{l}^{-}}\] done
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question_answer10)
'Ca' has atomic number 20 and atomic weight 40. Which of the following statements is not correct about 'Ca' atom?
A)
The number of electrons is same as the number of neutrons done
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B)
The number of nucleons is double the number of neutrons done
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C)
The number of protons is half the number of neutrons done
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D)
The number of nucleons is double the atomic number done
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question_answer11)
The radius of anatomic nucleus is close to
A)
\[{{10}^{-2}}cm\] done
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B)
\[{{10}^{-5}}cm\] done
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C)
\[{{10}^{-8}}cm\] done
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D)
\[{{10}^{-12}}cm\] done
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question_answer12)
Which is not true with respect to cathode rays?
A)
A stream of electrons done
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B)
Charged particles done
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C)
Move with same speed as that of light done
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D)
Can be deflected by magnetic fields done
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E)
Can be deflected by electric fields done
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question_answer13)
Number of protons, neutrons and electrons in the element\[_{89}{{\text{X}}^{\text{231}}}\]is
A)
89, 89, 242 done
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B)
89, 142, 89 done
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C)
89, 71, 89 done
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D)
89, 231, 89 done
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question_answer14)
A neutral atom (atomic number > (a) has
A)
electron and proton done
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B)
neutron and electron done
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C)
neutron, electron and proton done
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D)
neutron and proton done
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question_answer15)
The hydride ion is isoelectronic with
A)
\[{{\text{H}}^{+}}\] done
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B)
\[\text{H}{{\text{e}}^{+}}\] done
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C)
He done
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D)
Be done
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question_answer16)
Ratio of mass of proton and electron is
A)
infinite done
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B)
\[\text{1}.\text{8}\times \text{1}{{0}^{\text{3}}}\] done
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C)
1.8 done
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D)
none of these done
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question_answer17)
Which of the following statements is correct?
A)
the charge on an electron and on a proton are equal and opposite done
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B)
neutron has no charge done
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C)
electrons and protons have the same weight done
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D)
the mass of proton and a neutron are nearly identical done
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question_answer18)
Anode rays were discovered by
A)
Goldstein done
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B)
Rutherford done
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C)
GJ. Stoney done
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D)
J.J. Thomson done
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question_answer19)
The charge on the atom having 17 protons, 18 neutrons and 18 electrons is
A)
+1 done
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B)
-1 done
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C)
-2 done
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D)
zero done
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question_answer20)
Which pair is isoelectronic? (AFMC 198(c)
A)
Ar and\[Cl\] done
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B)
\[\text{N}{{\text{a}}^{+}}\]and Ne done
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C)
\[\text{N}{{\text{a}}^{+}}\]and Mg done
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D)
Mg and Ne done
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question_answer21)
Maximum number of electrons in any orbit is
A)
\[{{n}^{2}}\] done
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B)
\[2{{n}^{2}}\] done
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C)
\[1/2{{n}^{2}}\] done
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D)
none of these done
clear
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question_answer22)
Experimental evidence for the existence of atomic nucleus comes from
A)
Millikan's oil drop method done
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B)
Atomic absorption spectroscopy done
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C)
The magnetic bending of cathode rays done
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D)
Alpha rays scattering by a thin metal foil done
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question_answer23)
\[^{22}Na\]contains
A)
22 protons done
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B)
11 neutrons done
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C)
22 neutrons done
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D)
none of these done
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question_answer24)
Which of the following atoms has no neutron in its nucleus?
A)
Helium done
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B)
Lithium done
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C)
Protium done
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D)
Tritium done
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question_answer25)
An element has atomic number 11 and mass number 24. What does the nucleus contain?
A)
11 protons and 13 neutrons done
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B)
11 protons, 13 neutrons and 13 electrons done
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C)
13 protons and 11 neutrons done
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D)
13 protons and 11 electrons done
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question_answer26)
The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is
A)
2 done
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B)
17 done
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C)
37 done
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D)
38 done
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question_answer27)
Which is different in isotopes of an element?
A)
Atomic number done
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B)
Mass number done
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C)
Number of protons done
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D)
Number of electrons done
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question_answer28)
\[N{{a}^{+}}\]ion is isoelectronic with
A)
\[L{{i}^{+}}\] done
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B)
\[M{{g}^{+2}}\] done
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C)
\[C{{a}^{2+}}\] done
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D)
\[B{{a}^{2+}}\] done
clear
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question_answer29)
Neutron is a fundamental particle carrying
A)
a charge of +1 and a mass of 1 unit done
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B)
no charge and a mass of 1 unit done
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C)
no charge and no mass done
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D)
a charge of -1 and mass of 1 unit done
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question_answer30)
The number of electrons in the atom which has 20 protons in the nucleus is
A)
20 done
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B)
10 done
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C)
30 done
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D)
40 done
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question_answer31)
Number of electrons in the outermost orbit of the element of atomic number 15 is
A)
7 done
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B)
5 done
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C)
3 done
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D)
2 done
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question_answer32)
The discovery of neutron became very late because
A)
neutrons are present in nucleus done
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B)
neutrons are charge less done
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C)
neutrons are fundamental particles done
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D)
all done
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question_answer33)
The mass of the neutron is of the order of.
A)
\[\text{1}{{0}^{-\text{23}}}\text{ kg}\] done
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B)
\[\text{1}{{0}^{-\text{24}}}\text{ kg}\] done
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C)
\[\text{1}{{0}^{-\text{26}}}\text{ kg}\] done
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D)
\[\text{1}{{0}^{-\text{27}}}\text{ kg}\] done
clear
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question_answer34)
Cathode rays are
A)
electronegative waves done
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B)
radiations done
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C)
stream of a -particles done
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D)
stream of electrons done
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question_answer35)
An atom of Mn, atomic number 25 and atomic weight 55 contains in its nucleus
A)
55 protons done
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B)
55 neutrons done
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C)
25 neutrons done
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D)
25 protons done
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question_answer36)
Which is the correct statement about proton?
A)
proton is nucleus of deuterium done
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B)
proton is a particle done
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C)
proton is ionized hydrogen molecule done
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D)
proton is ionized hydrogen atom done
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question_answer37)
Neutron was discovered by
A)
Rutherford done
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B)
Langmuir done
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C)
Chadwick done
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D)
Austin done
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question_answer38)
As we move away from nucleus, the energy of orbit
A)
decreases done
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B)
increases done
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C)
remains unchanged done
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D)
none of these done
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question_answer39)
The mass of atom is constituted mainly by
A)
neutrons and neutrions done
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B)
neutrons and electrons done
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C)
neutrons and protons done
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D)
protons and electrons done
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question_answer40)
The electronic configuration of elements A, B, C and D are (2, 8, (a) (2, 8, (b) and (2, 8, 7) respectively. Which of them can make an ion with two negative charges.
A)
A done
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B)
B done
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C)
C done
clear
D)
D done
clear
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