Buy Atomic and Nuclear Physics Discussion

Buy Atomic and Nuclear Physics Discussion
Buy Atomic and Nuclear Physics Discussion
1. Atom
(a) is the smallest particle of the
matter.
(b) is the biggest particle of the matter.
(c) is made up of electron, proton and
neutron.
(d) Both (a) and (c)
2. Why was the Thomson’s model of an
atom failed?
(a) It did not give an idea about the
discrete energy level.
(b) It explained the atom as a whole to
be electrically neutral.
(c) It did not tell about the presence of
electrons.
(d) None of the above
3. Scattering of α-particles by a thin gold
foil suggests the presence of
[CDS 2020, 2019, NDA 2017]
(a) electron in an atom
(b) proton in an atom
(c) positively charged nucleus at the
centre of an atom
(d) isotopes of gold
4. Assertion (A) The force of repulsion
between atomic nucleus and
α-particle varies with distance
according to inverse square law.
Reason (R) Rutherford did α-particle
scattering experiment.
Codes
(a) Both A and R are true and R is the
correct explanation of A
(b) Both A and R are true, but R is not
the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Buy Atomic and Nuclear Physics Discussion
5. According to the Rutherford’s Atomic
Model, the electrons inside the atom
are
(a) stationary
(b) not stationary
(c) centralised
(d) None of the above
6. Bohr’s Atomic model assumes
(a) the nucleus is of infinite mass and is at
rest.
(b) electrons in a quantized orbit with hot
radiate energy.
(c) mass of electron remains constant.
(d) All of the above
7. The ionisation energy of hydrogen atom
in the ground state is [NDA 2017]
(a) 13 6. MeV (b) 13 6. eV
(c) 13 6. J (d) zero
8. Energy of electron in an orbit of H-atom
is
(a) positive (b) negative
(c) zero (d) nothing can be said
9. In which region of electromagnetic
spectrum does the Lyman series of
hydrogen atom lie? [SSC (10 2) 2015]
(a) Visible (b) Infrared
(c) Ultraviolet (d) X-ray
10. The force of attraction between an
electron revolving around the nucleus
and the nucleus is an … force.
[SSC 2017]
(a) mechanical (b) electric
(c) magnetic (d) gravitational
11. Which is the most suitable unit for
expressing nuclear radius? [SSC 2017]
(a) Micron (b) Nanometer
(c) Fermi (d) Angstrom
12. An element has an atomic weight of W
and an atomic number of N. The number
of protons in the nucleous of its atom is
(a) N (b) W [RRB 2018]
(c) W − N (d) W N
13. Size of nucleus is of the order of
(a) 10−10m (b) 10−15 m
(c) 10−12 m (d) 10−19 m
14. Which of the following particles are
constituents of the nucleus?
(a) Protons and electrons
(b) Protons and neutrons
(c) Neutrons and electrons
(d) Neutrons and positrons
15. Atomic mass of an element is equal to
the sum of number of [NDA 2020]
(a) electrons and protons only
(b) protons and neutrons only
(c) electrons and neutrons only
(d) electrons, protons and neutrons
16. Neutrons were discovered by
[SSC CGL 2020, NDA 2020]
(a) James Chadwick
(b) Ernest Rutherford
(c) JJ Thomson
(d) John Dalton
17. Isotopes are atoms having
(a) same number of protons but
different number of neutrons.
(b) same number of neutrons but
different number of protons.
(c) same number of protons and
neutrons.
(d) None of the above
18. Nuclear forces are
(a) short ranged attractive and charged
independent.
(b) short ranged attractive and charge
dependent.
(c) long ranged repulsive and charge
independent.
(d) long ranged repulsive and charge
dependent.
19. Radioactivity is measured by
[NDA 2017]
(a) GM counter
(b) Polarimeter
(c) Calorimeter
(d) Colorimeter
20. 1 curie is equal to
(a) 3 1010 × disintengrations/s
(b) 37 107
. × disintegrations/s
(c) 5 107
× disintegrations/s
(d) 37 1010
. × disintegrations/s
Having a hard time figuring out how to do your assignment?
Ask our experts for help and get it done in no time!