Q1. Each of the stationary orbits are associated with:
- A certain amount of energy.
- A certain amount of velocity.
- A certain amount of force.
- A certain amount of mass.
- Q2. According to the modern revised model of an atom, electrons:
- move freely inwards or outwards in intermediate states.
- are evenly distributed in a single orbit.
- are scattered in the extra nuclear space.
- are confined to clearly defined orbits.
- Q3. Select the sub-atomic particles that are present in the nucleus of an atom. A. Electrons B. Protons C. Neutrons
- Only B
- Only C
- Both A and B
- Both B and C
- Q4. Bohr proposed that while revolving in discrete orbits, the electrons
- Do not radiate energy
- Gain energy
- Lose energy
- First lose energy and then gain energy
- Q5. N shell can have a maximum of _______ electrons.
- 32
- 2
- 8
- 18
- Q6. What will be the valency of an element having atomic number (Z)=7?
- 1
- 2
- 3
- 4
- Q7. Electron is represented as
- e-
- e-2
- P+
- P+2
- Q8. What is the charge of a proton in coulombs?
- +1.6 x 10-19 C
- +1.6 x 1019 C
- 1.6 x 10-24 C
- 1.76 x 10-11 C
- Q9. The atomic number and the mass number of an element A are 14 and 28 respectively. The number of neutrons are:
- 14
- 28
- 12
- 42
- Q10. Which of the following elements is used in the treatment of cancer?
- Iodine
- Cobalt
- Uranium
- Nickel
- Q11. Most of the alpha particles passed through the gold foil without deflection because
- Atoms are stable.
- Most of the space inside the atom is empty.
- Atoms are unstable.
- All the space inside the atom is covered by nucleus.
- Q12. Atomic number is equal to
- Number of protons
- Number of neutrons
- Number of protons + Number of electrons
- Number of protons + Number of neutrons
- Q13. The number of electrons in an atom of Fluorine is 9. Its electronic configuration is _______ .
- 2, 7
- 7, 2
- 8, 1
- 1, 8
- Q14. Which of the following shells is closest to the nucleus?
- K shell
- L shell
- M shell
- N shell
- Q15. During the alpha-particles scattering experiment, which of the following observations is correct for most of the alpha-particles?
- Most of the alpha-particles passed straight through the gold foil.
- Most of the alpha particles were deflected by small angles by the gold foil.
- Most of the alpha particles appeared to rebound.
- Most of the alpha particles reflected by 90o.
- Q16. How many valence electrons are present in a potassium atom?
- 1
- 2
- 8
- 3
- Q17. Mass number is equal to
- Number of protons
- Number of electrons
- Number of protons + Number of electrons
- Number of protons + Number of neutrons
- Q18. How many neutrons are present in the Boron atom having 5 protons and mass number of 11 in its nucleus?
- 5 neutrons
- 11 neutrons
- 6 neutrons
- 16 neutrons
- Q19. Who is known as the 'Father' of nuclear chemistry and nuclear physics?
- E. Goldstein
- J.J. Thomson
- John Dalton
- Rutherford
- Q20. Thomson's model of an atom was proved wrong by which scientist?
- Rutherford
- Bohr
- Goldstein
- Dalton
- Q21. Which of the following is the correct electronic configuration for magnesium?
- 2, 8, 2
- 2, 8, 3
- 2, 8, 4
- 2, 8, 1
- Q22. Which of the following statements is not a part of J. J. Thomson’s atomic model?
- Atom is a hollow sphere.
- Atom is a gel of positive charge.
- Atoms have embedded negatively charged electrons.
- Electrons help in conduction of electricity.
- Q23. In Rutherford's experiment, some of the alpha-particles were deflected by the gold foil through small angles. What does it conclude?
- Alpha-particles are not electrically charged.
- Alpha-particles move in a straight line.
- There is a positively charged body present in the atom.
- Atom is very large in size.
- Q24. According to Rutherford's atomic model, if a large play ground represents an atomic size, which of the following objects best represent the size of a nucleus?
- A football
- A Baseball
- A tennis ball
- A volley ball
- Q25. The maximum number of electrons that can be accomodated in an orbit is given by the formula _______ where n is the number of orbit.
- 2/n2
- 2n2
- 2(n + 2)
- 2n + 2
- Q26. The increasing order of the energy levels in an atom is _______ .
- K > L > M > N
- K < L < M < N
- L > M > N > K
- L < M < N < K
- Q27. What is the charge on an electron?
- -1
- +1
- +2
- -2
- Q28. Which parameter of an element can be used for its identification?
- Number of neutrons
- Number of electrons
- Mass number
- Atomic number
- Q29. If both K and L shells are filled, the total number of electrons contained in them will be
- 10
- 8
- 6
- 4
- Q30. According to Rutherford's model of an atom, which subatomic particles revolve around the nucleus in well defined orbits?
- Neutrons
- Electrons
- Protons
- Quarks
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