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Objective Questions

Latest Odisha Police Constable Communication Exam Question (Objective Questions), MCQ in English

Subjects : Physics, Computer Science

Question Bank Odisha Police Constable (Communication) Exam - English
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Physics

Question 1Single Answer
Who proposed the nuclear model of the atom?
  1. A
    J. J. Thomson
  2. B
    James Chadwick
  3. C
    Niels Bohr
  4. D
    Ernest Rutherford
Question 2Single Answer
Rutherford’s atomic model was based on the experiment involving:
  1. A
    Cathode rays
  2. B
    Photoelectric effect
  3. C
    α-particle scattering
  4. D
    X-rays
Question 3Single Answer
According to Rutherford’s model, most of the mass of an atom is concentrated in the:
  1. A
    Electron cloud
  2. B
    Nucleus
  3. C
    Outer shell
  4. D
    Valence shell
Question 4Single Answer
Most of an atom is:
  1. A
    Empty space
  2. B
    Solid matter
  3. C
    Positively charged
  4. D
    Negatively charged
Question 5Single Answer
The positively charged particle in the nucleus is the:
  1. A
    Electron
  2. B
    Neutron
  3. C
    Proton
  4. D
    Photon
Question 6Single Answer
The neutron was discovered by:
  1. A
    Rutherford
  2. B
    Chadwick
  3. C
    Bohr
  4. D
    Thomson
Question 7Single Answer
The atomic number of an element is equal to the number of:
  1. A
    Protons
  2. B
    Neutrons
  3. C
    Nucleons
  4. D
    Protons plus neutrons
Question 8Single Answer
The mass number of a nucleus is the total number of:
  1. A
    Electrons
  2. B
    Protons and neutrons
  3. C
    Neutrons only
  4. D
    Protons only
Question 9Single Answer
Atoms having the same atomic number but different mass numbers are called:
  1. A
    Isobars
  2. B
    Isotopes
  3. C
    Isotones
  4. D
    Ions
Question 10Single Answer
Atoms having the same mass number but different atomic numbers are:
  1. A
    Isotopes
  2. B
    Isotones
  3. C
    Isobars
  4. D
    Isoelectronic atoms
Question 11Single Answer
The number of neutrons in ²³₁₁Na is:
  1. A
    11
  2. B
    12
  3. C
    23
  4. D
    34
Question 12Single Answer
The number of neutrons in ¹⁴₆C is:
  1. A
    6
  2. B
    20
  3. C
    14
  4. D
    8
Question 13Single Answer
According to Bohr’s model, electrons revolve around the nucleus in:
  1. A
    Stationary orbits
  2. B
    Arbitrary paths
  3. C
    Straight lines
  4. D
    Spiral paths
Question 14Single Answer
In Bohr’s model, the angular momentum of an electron is:
  1. A
    Quantized
  2. B
    Continuous
  3. C
    Always zero
  4. D
    Infinite
Question 15Single Answer
The ground state of hydrogen corresponds to:
  1. A
    n = 0
  2. B
    n = 2
  3. C
    n = 1
  4. D
    n = 3
Question 16Single Answer
When an electron moves from a higher energy level to a lower energy level, it:
  1. A
    Absorbs a photon
  2. B
    Absorbs a neutron
  3. C
    Emits a proton
  4. D
    Emits a photon
Question 17Single Answer
The energy of an electron in the ground state of hydrogen is approximately:
  1. A
    −13.6 eV
  2. B
    −3.4 eV
  3. C
    0 eV
  4. D
    +13.6 eV
Question 18Single Answer
The ionization energy of hydrogen in its ground state is:
  1. A
    13.6 eV
  2. B
    10.2 eV
  3. C
    3.4 eV
  4. D
    27.2 eV
Question 19Single Answer
The Balmer series of hydrogen lies mainly in the:
  1. A
    Infrared region
  2. B
    Microwave region
  3. C
    Visible region
  4. D
    Radio region
Question 20Single Answer
The Lyman series lies in the:
  1. A
    Visible region
  2. B
    Ultraviolet region
  3. C
    Infrared region
  4. D
    Microwave region
Question 21Single Answer
The Paschen series lies in the:
  1. A
    Ultraviolet region
  2. B
    Visible region
  3. C
    Infrared region
  4. D
    X-ray region
Question 22Single Answer
The radius of the first Bohr orbit of hydrogen is approximately:
  1. A
    53 nm
  2. B
    0.53 nm
  3. C
    5.3 nm
  4. D
    0.053 nm
Question 23Single Answer
Nuclear forces are approximately:
  1. A
    Short-range forces
  2. B
    Long-range forces
  3. C
    Gravitational forces
  4. D
    Electrostatic forces only
Question 24Single Answer
The binding energy of a nucleus arises from:
  1. A
    Mass defect
  2. B
    Charge defect
  3. C
    Atomic number
  4. D
    Electron affinity
Question 25Single Answer
Einstein’s mass-energy relation is:
  1. A
    E = mc
  2. B
    E = mc²
  3. C
    E = m/c²
  4. D
    E = m²c
Question 26Single Answer
One atomic mass unit is approximately equal to:
  1. A
    931.5 MeV/c²
  2. B
    931.5 keV/c²
  3. C
    931.5 eV/c²
  4. D
    931.5 GeV/c²
Question 27Single Answer
Radioactivity was discovered by:
  1. A
    Henri Becquerel
  2. B
    Rutherford
  3. C
    Chadwick
  4. D
    Bohr
Question 28Single Answer
An α-particle is a:
  1. A
    Proton
  2. B
    Electron
  3. C
    Helium nucleus
  4. D
    Neutron
Question 29Single Answer
A β⁻ particle is essentially a:
  1. A
    Proton
  2. B
    Neutron
  3. C
    Electron
  4. D
    Photon
Question 30Single Answer
γ-rays are:
  1. A
    Charged particles
  2. B
    Neutrons
  3. C
    Helium nuclei
  4. D
    Electromagnetic waves
Question 31Single Answer
Among α, β and γ radiations, the greatest penetrating power is possessed by:
  1. A
    γ-rays
  2. B
    β-rays
  3. C
    α-rays
  4. D
    All equally
Question 32Single Answer
Among α, β and γ radiations, the greatest ionizing power is possessed by:
  1. A
    α-rays
  2. B
    β-rays
  3. C
    γ-rays
  4. D
    All equally
Question 33Single Answer
During α-decay, the mass number decreases by:
  1. A
    1
  2. B
    2
  3. C
    8
  4. D
    4
Question 34Single Answer
During α-decay, the atomic number decreases by:
  1. A
    2
  2. B
    1
  3. C
    3
  4. D
    4
Question 35Single Answer
During β⁻ decay, the atomic number of the nucleus:
  1. A
    Decreases by 2
  2. B
    Decreases by 1
  3. C
    Increases by 1
  4. D
    Remains unchanged
Question 36Single Answer
During γ-decay, the mass number:
  1. A
    Increases
  2. B
    Decreases
  3. C
    Becomes zero
  4. D
    Remains unchanged
Question 37Single Answer
Half-life is the time required for:
  1. A
    All nuclei to decay
  2. B
    One-fourth nuclei to decay
  3. C
    Half of radioactive nuclei to decay
  4. D
    Activity to double
Question 38Single Answer
The SI unit of radioactive activity is:
  1. A
    Curie
  2. B
    Gray
  3. C
    Roentgen
  4. D
    Becquerel
Question 39Single Answer
One becquerel represents:
  1. A
    One decay per minute
  2. B
    One decay per second
  3. C
    100 decays per second
  4. D
    1000 decays per second
Question 40Single Answer
Nuclear fission involves:
  1. A
    Splitting a heavy nucleus
  2. B
    Joining light nuclei
  3. C
    Splitting an electron
  4. D
    Joining electrons
Question 41Single Answer
Nuclear fusion involves:
  1. A
    Combining light nuclei
  2. B
    Splitting heavy nuclei
  3. C
    Destroying neutrons
  4. D
    Producing electrons only
Question 42Single Answer
The energy of the Sun is mainly produced by:
  1. A
    Chemical combustion
  2. B
    Nuclear fusion
  3. C
    Nuclear fission
  4. D
    Radioactive decay only
Question 43Single Answer
A commonly used fissile material in nuclear reactors is:
  1. A
    Nitrogen-14
  2. B
    Carbon-12
  3. C
    Oxygen-16
  4. D
    Uranium-235
Question 44Single Answer
A moderator in a nuclear reactor is used to:
  1. A
    Speed up neutrons
  2. B
    Slow down neutrons
  3. C
    Absorb all γ-rays
  4. D
    Increase temperature directly
Question 45Single Answer
Heavy water can be used in a nuclear reactor as a:
  1. A
    Moderator
  2. B
    Fuel
  3. C
    Control rod
  4. D
    Radiation source
Question 46Single Answer
Control rods in nuclear reactors are commonly made from materials such as:
  1. A
    Cadmium
  2. B
    Copper
  3. C
    Aluminium
  4. D
    Silicon
Question 47Single Answer
Control rods control the chain reaction by absorbing:
  1. A
    Neutrons
  2. B
    Protons
  3. C
    Electrons
  4. D
    Photons
Question 48Single Answer
The stability of a nucleus is closely related to its:
  1. A
    Electron affinity
  2. B
    Binding energy per nucleon
  3. C
    Refractive index
  4. D
    Conductivity
Question 49Single Answer
Maximum binding energy per nucleon occurs approximately near:
  1. A
    Iron
  2. B
    Hydrogen
  3. C
    Uranium
  4. D
    Helium only
Question 50Single Answer
A device used to detect ionizing radiation is the:
  1. A
    Geiger-Müller counter
  2. B
    Potentiometer
  3. C
    Galvanometer
  4. D
    Transformer
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