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Question 1. Who is known as the father of nuclear physics?
  1.    Bohr
  2.    J.J Thomson
  3.    E.Rutherford
  4.    Chadwick
Answer: Option C
: C

E. Rutherford is regarded as the father of nuclear physics.

Question 2. Which property of the gold metal was considered for Rutherford's alpha-ray scattering experiment?
  1.    Lusture
  2.    Ductility
  3.    Malleability
  4.    Sonority
Answer: Option C
: C

The ability of the metal to be beaten into thin sheets is called malleability. Rutherford needed a very thin sheet of metal for the alpha-ray scattering experiment. Hence, gold, the most malleable metal was used.

Question 3. In Niels Bohr model of the atom, the orbits or shells are represented by the letters:
  1.    A, B, C, D
  2.    K, L, M, N
  3.    P, Q, R, S
  4.    W, X, Y, Z
Answer: Option B
: B

The orbits or shells of an atom are represented as shown in the picture below. The nucleus is at the centre of the atom and the electrons in the shells around the nucleus. The shells in an atom are represented by the letters K,L,M,N and so on.


Question 4. Atoms have electrons, protons, and neutrons as the fundamental particles. The net electrical charge on an atom is:
  1.    Positive
  2.    Negative
  3.    Neutral
  4.    Cannot be predicted
Answer: Option C
: C

An atom has always an equal number of electrons (negatively charged particles) and protons(positively charged particles), because of which there is no charge on the atom. Neutrons being neutral does not affect the charge of an atom.

Question 5. Which of the following statement is true regarding gamma rays?
  1.    They are positively charged.
  2.    They are electrically neutral.
  3.    They are negatively charged.
  4.    The charge associated with gamma rays vary.
Answer: Option B
: B

Gamma rays are electromagnetic radiations. They are electrically neutral in nature. They have no mass.