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Modern Physics

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15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following statements are incorrect for a nucleus of an atom?
(a) The size of nucleus is of the order of 10-5 m.
(b) It contains nucleons naming proton and neutron.
(c) The total number of nucleons determines its atomic number.
(d) The mass of nucleus of an atom is approximately equal to the product of its mass number and the number of proton.

  1. Both (a) and (b)
  2. Both (b) and (c)
  3. Both (c) and (d)
  4. Both (a) and (c)
  5. Both (b) and (d)
Question 2 Multiple Choice (Single Answer)

Which of the following statements are correct for work function?
(a) It is defined as the energy required for emitting electrons from metallic surface.
(b) Its value is generally expressed in joule.
(c) It is a characteristic of a metal.
(d) The work function for alkali metals is very high.

  1. Both (a) and (b)
  2. Both (a) and (c)
  3. Both (b) and (c)
  4. Both (b) and (d)
  5. Both (a) and (d)
Question 3 Multiple Choice (Single Answer)

Which of the following is a condition for existence of a radioactive element?

  1. The number of protons and neutrons are nearly equal.
  2. The number of protons exceeds much more than that of the neutrons.
  3. The number of neutrons exceeds much more than that of the protons.
  4. The number of protons exceeds much more than that of the electrons.
  5. The number of electrons exceeds much more than that of the neutrons.
Question 4 Multiple Choice (Single Answer)

Which of the following does not affect the rate of thermionic emission?

  1. Nature of the metal
  2. Temperature of surface of the metal
  3. Shape of the metal
  4. Both temperature and shape of the metal
  5. Both temperature and surface area of the metal
Question 5 Multiple Choice (Single Answer)

The atomic and mass number of an atom of an element are 27 and 60 respectively. Which of the following statements are incorrect conclusions for the given data?
(a) The name of the element is potassium.
(b) It is a radioactive element.
(c) The atom contains 33 neutrons in its nucleus.
(d) It is a radioisotope of cobalt.
(e) The ratio of neutron to the proton is less than 1.

  1. Both (a) and (b)
  2. Both (a) and (c)
  3. Only (a) and (e)
  4. Both (a) and (d)
  5. Both (b) and (c)
Question 6 Multiple Choice (Single Answer)

A student of class 10 of ICSE board gives the clues in the form of reasons for the emission of beta particle to one of his classmates who recently studied the chapter of modern physics. Which of the following clues should he choose to reach the correct reason for this?

  1. An electron of outer orbit comes out of an atom after being exited.
  2. A proton disintegrates into neutron and electron, and this electron comes out of an atom.
  3. A neutron disintegrates into proton and electron, and this electron comes out of an atom.
  4. An electron of inner orbit falls into the nucleus, and finally comes out of an atom.
  5. A neutron strikes the electron of inner orbit and expels it out as a beta particle.
Question 7 Multiple Choice (Single Answer)

Which of the following is a result of an alpha emission from a radioactive element?

  1. The atomic number of the daughter element is increaseed by 2.
  2. The atomic number of the daughter element is decreased by 2.
  3. The mass number of the daughter element is increased by 4.
  4. Atomic number of daughter element is increased by 2, and mass number is increased by 4.
  5. Atomic number of daughter element is decreased by 2, and mass number is decreased by 4.
Question 8 Multiple Choice (Single Answer)

Which of the following helps in explaining the phenomenon of radioactivity?

  1. Law of conservation of mass
  2. Law of conservation of charge
  3. Law of conservation of mass and charge
  4. Law of constant and multiple proportion
  5. Law of conservation of charge and constant proportion
Question 9 Multiple Choice (Single Answer)

Which of the following elements is not correctly matched with its work function?

  1. Platinum: 6.2 eV
  2. Chromium: 4.52 eV
  3. Zinc: 2.3 eV
  4. Potassium: 2.26 eV
  5. Tungsten: 4.52 eV
Question 10 Multiple Choice (Single Answer)

Which of the following are known as tracers in the field of medical science?
(a) Cobalt-60
(b) Radio-sodium chloride
(c) Radio-iodine
(d) Gamma rays

  1. Both (a) and (b)
  2. Both (b) and (c)
  3. Both (a) and (c)
  4. Both (a) and (d)
  5. Both (b) and (d)
Question 11 Multiple Choice (Single Answer)

Which of the following information about an alpha particle is not correct?

  1. The mass of an alpha particle is 6.68 x 10-27 kg.
  2. Its charge is + 3.2 x 10-19 coulomb.
  3. Its specific charge is 1.76 x 1011coulomb per kilogram.
  4. It is deflected in both electric and magnetic field.
  5. It is used for transmutation.
Question 12 Multiple Choice (Single Answer)

What of the following is not correct about background radiation?

  1. They are radiations to which we all are exposed even in the absence of visible radioactive sources.
  2. Radium, K-40 and C-14 are some of the sources of these radiations.
  3. They cause serious biological damage to us.
  4. Gamma radiations come from the radioactive rocks in the earth's crust.
  5. They do not exceed the maximum permissible level for human safety.
Question 13 Multiple Choice (Single Answer)

Which of the following is not correct for gamma radiations?
(a) Gamma radiations occur when the parent nucleus is in a state of excitation.
(b) They are the electromagnetic waves.
(c) Their ionising power is very high.
(d) They affect a photographic plate.
(e) They do not cause fluorescence.

  1. Only (a)
  2. Only (b)
  3. Both (a) and (c)
  4. Both (b) and (d)
  5. Both (c) and (e)
Question 14 Multiple Choice (Single Answer)

Which of the following radio isotopes are largely found in the bones, and affect only the bones and reproductive organs of humans?

  1. Radium
  2. Potassium-40
  3. Carbon -14
  4. Carbon -12
  5. Radio-iodine
Question 15 Multiple Choice (Single Answer)

Which of the following is considered as a helping hand in the manufacture of paper, plastic and metallic sheets?

  1. Alpha rays
  2. UV rays
  3. Gamma rays
  4. Cosmic rays
  5. X-rays
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