Q 1. The discovery of neutron became very late because :;

(d) all of the above;

(c) neutrons are fundamental particles;

(b) neutrons are chargeless;

(a) neutrons are present in nucleus;

Q 2. Neutron is discovered by;

(d) Dalton;

(c) Yukawa;

(b) Rutherford;

(a) Chadwick;

Q 3. Which of the following properties of atom could be explained correctly by Thomson Model of atom?;

(d) Stability of atom.;

(c) Position of electrons, protons and neutrons in atom.;

(b) Spectra of hydrogen atom.;

(a) Overall neutrality of atom.;

Q 4. Arrange the following in terms of penetrating power \(\alpha)-rays, \(\beta\)-rays, \(\gamma\)-rays;

(b) \(\alpha > \gamma > \beta \);

(c) \(\alpha > \beta < \gamma\);

(b) \(\alpha < \beta < \gamma\);

(a) \(\alpha > \beta > \gamma\);

Q 5. Which of the rays are not deflected by the electric and magnetic field?;

(d) Both (a) and (b);

(c) \(\beta)rays;

(b) X-rays;

(a) \(\gamma\)-rays;

Q 6. Rutherford's experiment on the scattering of \(\alpha\(-particles showed for the first time that the atom has :;

(a) electrons;

(b) protons;

(c) nucleus;

(d) neutrons';

Q 7. Rutherford's experiment which established the nuclear model of the atom used a beam of;

(a) \(\beta\(-particles which impinged on a metal foil and got absorbed ;

(b) \(\gamma\(-rays which impinged on a metal foil and ejected electrons;

(c) helium atoms, which impinged on a metal foil and got scattered;

(d) helium nuclei, which impinged on a metal foil and got scattered;

Q 8. Which of the following scientists explained his model on the basis of centrifugal force?;

(a) Thomson;

(b) Dalton;

(c) Millikan;

(d) Rutherford;

Q 9. The number of neutrons in dipositive zinc ion with mass number 70 is;

(a) 34;

(b) 36;

(c) 38;

(d) 40;

Q 10. Millikan performed an experiment method to determine which of the following?;

(d) Both (a) and (b);

(c) \(\mathrm{e} / \mathrm{m}\( ratio of electron;

(b) Charge of the electron;

(a) Mass of the electron;

Q 1. Which is correct statement about proton?;

(a) Proton is nucleus of deuterium;

(b) Proton is \(\alpha\(-particle;

(c) Proton is ionized hydrogen molecule;

(d) Proton is ionized hydrogen atom;

Q 1. The lightest particle is :;

(a) \(\alpha\)-particle;

(b) positron;

(c) proton;

(d) neutron;

Q 2. Nucleons are;

(a) only neutrons;

(b) neutrons + protons;

(c) neutrons + protons + electrons;

(d) neutrons + electrons;

Q 3. Which one is a wrong statement? [2018];

(a) Total orbital angular momentum of electron in ' \(s\) ' orbital is equal to zero;

(b) An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers;

(c) The value of \(m\) for \(d_{z}^{2}\) is zero;

(d) The electronic configuration of \(\mathrm{N}\) atom is;

Q 4. Which one is the wrong statement? [2017];

(a) The uncertainty principle is \(\Delta E \times \Delta t \geq h / 4 \pi\);

(b) Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.;

(c) The energy of 2 sorbital is less than the energy of \(2 p\) orbital in case of Hydrogen like atoms;

(d) de-Broglie's wavelength is given by \(\lambda=\frac{h}{m v}\), where \(m=\) mass of the particle, \(v=\) group velocity of the particle;

Q 1. When beryllium is bombarded with alpha particles (Chadwick's experiment) extremely penetrating radiations, which cannot be deflected by electrical or magnetic field are given out These are :;

(a) A beam of protons;

(b) Alpha rays;

(c) A beam of neutrons;

(d) A beam of neutrons and protons;

Q 2. Suppose beam containing all three fundamental subatomic particles are allowed to pass through an electric field as shown in figure The subatomic particles detected at three points \(\mathrm{A}, \mathrm{B}\( and \(\mathrm{C}\( on the screen respectively are ?;

(a) Protons, neutrons, electrons;

(b) Electrons, neutrons, protons;

(c) Electrons, protons, neutrons;

(d) Neutrons, protons, electrons;

Q 3. When atoms are bombarded with alpha particles, only, a few in million suffer deflection, others pass out undeflected This is because;

(a) the force of repulsion on the moving alpha particle is small;

(b) the force of attraction between alpha particle and oppositely charged electrons is very small;

(c) there is only one nucleus and large number of electrons;

(d) the nucleus occupies much smaller volume compared to the volume of the atom;

Q 4. If the alpha-particles are projected against the following atoms \(\mathrm{Fe}, \mathrm{Be}, \mathrm{Mg}, \mathrm{Al}\) then increasing order in which the alpha-particle feel repulsion will be;

(a) \(\mathrm{Be}, \mathrm{Mg}, \mathrm{Al}, \mathrm{Fe}\);

(b) \(\mathrm{Be}, \mathrm{Al}, \mathrm{Mg}, \mathrm{Fe}\);

(c) \(\mathrm{Mg}, \mathrm{Al}, \mathrm{Mg}, \mathrm{Fe}\);

(d) \(\mathrm{Al}, \mathrm{Mg}, \mathrm{Fe}, \mathrm{Be}\);

Q 1. Rutherford's \(\alpha\(-particle dispersion experiment concludes;

(a) all positive ions are deposited at small part;

(b) all negative ions are deposited at small part;

(c) proton moves around the electron;

(d) neutrons are charged particles.;

Q 2. Bohr model can explain :;

(a) the solar spectrum;

(b) the spectrum of hydrogen molecule;

(c) spectrum of any atom or ion containing one electron only;

(d) the spectrum of hydrogen atom only;

Q 1. Which is not true with respect to cathode rays?;

(a) A stream of electrons;

(b) Charged particles;

(c) Move with speed same as that of light;

(d) Can be deflected by magnetic fields;

Q 2. Cathode rays are deflected by;

(a) an electric field only;

(b) magnetic field only;

(c) by both;

(d) by none;

Q 3. The orbitals are called degenerate when;

(a) they have the same wave functions;

(b) they have the same wave functions but different energies;

(c) they have different wave functions but same energy;

(d) they have the same energy;

Q 4. The orbitals are called degenerate when [1996];

(a) they have the same wave functions;

(b) they have the same wave functions but different energies;

(c) they have different wave functions but same energy;

(d) they have the same energy;

Q 1. Two atoms are said to be isotopes if:;

(D) They have same number of neutrons but different modes of radioactive decay;

(C) The sum of the number of protons and neutrons is same but number of protons are different;

(B) They have same number of neutrons but different mass number;

(A) They have same atomic number but different mass numbers;

Q 2. Two atoms are said to be isotopes if:;

(D) They have same number of neutrons but different modes of radioactive decay;

(C) The sum of the number of protons and neutrons is same but number of protons are different;

(B) They have same number of neutrons but different mass number;

(A) They have same atomic number but different mass numbers;

Q 3. The Bohr orbit radius for the hydrogen atom \((n=1)\) is approximately \(0 530 \AA\) The radius for the first excited state (n=2) orbit is (in \(\AA\) );

(d) 2.12;

(c) 4.77;

(b) 1.06;

(a) 0.13;

Q 4. The Bohr orbit radius for the hydrogen atom \((n=1)\) is approximately \(0.530 \ \text{\AA}\). The radius for the first excited state \((n=2)\) orbit is (in \(\text{\AA}\)): [1998];

(a) 0.13;

(b) 1.06;

(c) 4.77;

(d) 2.12;

Q 5. If ionization potential for hydrogen atom is \(13 6 \mathrm{eV}\), then ionization potential for \(\mathrm{He}^{+}\)will be;

(a) \(54.4 \mathrm{eV}\);

(b) \(6.8 \mathrm{eV}\);

(c) \(13.6 \mathrm{eV}\);

(d) \(24.5 \mathrm{eV}\);

Q 1. In photoelectric effect, at which frequency electron will be ejected with certain kinetic energy ( \(v_{0}=\) threshold frequency);

(d) \(v \geq v_{0}\);

(c) \(v_{0} \geq v\);

(b) \(v_{0}>v\);

(a) \(v>v_{0}\);

Q 2. An electron from one Bohr stationary orbit can go to next higher orbit;

(d) without emission or absorption of electromagnetic radiation;

(c) by absorption of electromagnetic radiation of particular frequency;

(b) by absorption of any electromagnetic radiation;

(a) by emission of electromagnetic radiation;

Q 3. What does negative sign in the electronic energy for hydrogen atom convey;

(a) Energy of electron when \(\mathrm{n}=\infty\);

(b) The energy of electron in the atom is lower than the energy of a free electron in motion;

(c) The energy of electron in the atom is lower than the energy of a free electron of rest;

(d) The energy of electron decreases as it moves away from nucleus;

Q 4. An ion has 18 electrons in the outermost shell, it is;

(a) \(\mathrm{Cu}^{+}\);

(b) \(\mathrm{Th}^{4+}\);

(c) \(\mathrm{Cs}^{+}\);

(d) \(\mathrm{K}^{+}\);

Q 5. In a given atom no two electrons can have the same values for all the four quantum numbers This is called;

(a) Hund's Rule;

(b) Aufbau principle;

(c) Uncertainty principle;

(d) Pauli's exclusion principle;

Q 6. For which element, the valence electron will be present in the highest energy orbital;

(a) \({ }_{3} \mathrm{Li}\);

(b) \({ }_{16} \mathrm{~S}\);

(c) \({ }_{20} \mathrm{Ca}\);

(d) \({ }_{21} \mathrm{Sc}\);

Q 7. The electron was shown experimentally to have wave properties by [1994];

(d) Schrodinger.;

(c) N. Bohr;

(b) Davisson and Germer;

(a) de Broglie;

Q 8. The ions \(\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}\) and \(\mathrm{Al}^{3+}\) are isoelectronic Their ionic radii show [2003];

(a) A decrease from \(\mathrm{O}^{2-}\) to \(\mathrm{F}^{-}\)and then increase from \(\mathrm{Na}^{+}\)to \(\mathrm{Al}^{3+}\);

(b) A significant increase from \(\mathrm{O}^{2-}\) to \(\mathrm{Al}^{3+}\);

(c) A significant decrease from \(\mathrm{O}^{2-}\) to \(\mathrm{Al}^{3+}\);

(d) An increase from \(\mathrm{O}^{2-}\) to \(\mathrm{F}^{-}\)and then decrease from \(\mathrm{Na}^{+}\)to \(\mathrm{Al}^{3+}\);

Q 9. Two electrons occupying the same orbital are distinguished by \([2016]\);

(a) Principal quantum number;

(b) Magnetic quantum number;

(c) Azimuthal quantum number;

(d) Spin quantum number;

Q 10. The ion that is isoelectronic with \(\mathrm{CO}\) is [1997];

(a) \(\mathrm{CN}^{-}\);

(b) \(\mathrm{O}_{2}{ }^{+}\);

(c) \(\mathrm{O}_{2}^{-}\);

(d) \(\mathrm{N}_{2}{ }^{+}\);

Q 1. An element has atomic number 11 and mass number 24 What does the nucleus contain?;

(a) 11 protons, 13 neutrons;

(b) 11 protons, 13 neutrons, 13 electrons;

(c) 13 protons, 11 neutrons;

(d) 13 protons, 11 electrons;

Q 2. A' represents mass no and \(Z\( represents atomic no then \(\alpha\( - decay is characterized by;

(a) Z increases by 2 , A decreases by 4;

(b) Z decreases by 2 , A increases by 4;

(c) Z decreases by 2 , A decreases by 4;

(d) Z increases by 2 , \(\mathrm{A}\( increases by 4 .;

Q 3. Atoms with same mass number but different atomic numbers are called;

(a) isotopes;

(b) isobars;

(c) isochores;

(d) None of these;

Q 4. What is the difference between two species if one has atomic mass =14 and atomic number =7 whereas the other has atomic mass =14 and atomic number =6 ?;

(a) Neutrons;

(b) Protons;

(c) Electrons;

(d) All of these;

Q 5. From the data given below \(A, B, C \text{ and } D \text{ respectively are,} \\ A: \, 10 e^{-}, \text{ atomic no. 11} \\ B: \, 10 e^{-}, \text{ atomic no. 6} \\ C: \, 10 e^{-}, \text{ atomic no. 10} \\ D: \, 10 e^{-} \);

(a) \(\mathrm{Na}^{+}, \mathrm{C}^{4-}, \mathrm{Ne}, \mathrm{F}^{-}\);

(b) \(\mathrm{C}^{4-}, \mathrm{Ne}, \mathrm{Na}^{-}, \mathrm{F}^{-}\);

(c) \(\mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Ne}, \mathrm{C}^{4-}\);

(d) \(\mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{C}^{4-}, \mathrm{Ne}\);

Q 6. In hydrogen atomic spectrum, a series limit is found at \(12186 3 \mathrm{~cm}^{-1}\) Then it belong to;

(a) Lyman series;

(b) Balmer series;

(c) Paschen series;

(d) Brackett series;

Q 1. When a metal surface is exposed to solar radiations;

(a) The emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations;

(b) The emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiation;

(c) The emitted electrons have zero energy;

(d) The emitted electrons have energy equal to energy of photons of incident light;

Q 2. What will be the difference between electromagnetic radiation shown in \(\mathrm{A}\) and \(\mathrm{B}\) respectively? (A) (B) (i) Velocity (ii) Wavelength (iii) Frequency (iv) Energy;

(a) (ii) only;

(b) (ii) and (iv);

(c) (ii), (iii) and (iv);

(d) (iv) only;

Q 1. Heisenberg uncertainty principle can be explained as;

(a) \(\Delta x \geq \frac{\Delta P \times h}{4 \pi}\);

(b) \(\Delta x \times \Delta P \geq \frac{h}{4 \pi}\);

(c) \(\Delta x \times \Delta P \geq \frac{h}{\pi}\);

(d) \(\Delta P \geq \frac{\pi h}{\Delta x}\);

Q 2. Heisenberg's uncertainity principle is applicable to;

(a) atoms only;

(b) electron only;

(c) nucleus only;

(d) any moving object;

Q 1. The following quantum numbers are possible for how many orbital(s) \(n=3, l=2, \mathrm{~m}=+2\) ?;

(a) 1;

(b) 3;

(c) 2;

(d) 4;

Q 2. The following quantum numbers are possible for how many orbital (s) \(n=3, l=2, m=+2\) ? [2001];

(a) 1;

(b) 3;

(c) 2;

(d) 4;

Q 1. The \(\mathrm{Li}^{2+}\) ion is moving in the third stationary state, and its linear momentum is \(7 3 \times 10^{-34} \mathrm{~kg} \mathrm{~ms}^{-1}\) Calculate its angular momentum;

(a) \(1.158 \times 10^{-45} \mathrm{~kg} \mathrm{~m}^{2} \mathrm{~s}^{-1}\);

(b) \(11.58 \times 10^{-48} \mathrm{~kg} \mathrm{~m}^{2} \mathrm{~s}^{-1}\);

(c) \(11.58 \times 10^{-47} \mathrm{~kg} \mathrm{~m}^{2} \mathrm{~s}^{-1}\);

(d) \(12 \times 10^{-45} \mathrm{~kg} \mathrm{~m}^{2} \mathrm{~s}^{-1}\);

Q 2. If uncertainty in position and momentum are equal, then uncertainty in velocity is :;

(a) \(\frac{1}{2 m} \sqrt{\frac{h}{\pi}}\);

(b) \(\sqrt{\frac{h}{2 \pi}}\);

(c) \(\frac{1}{m} \sqrt{\frac{h}{\pi}}\);

(d) \(\sqrt{\frac{h}{\pi}}\);

Q 3. The five \(d\)-orbitals are designated as \(d_{x y}, d_{y z}, d_{x z}, d_{x^{2}-y^{2}}\) and \(d_{z^{2}}\) Choose the correct statement;

(a) The shapes of the first three orbitals are similar but that of the fourth and fifth orbitals are different;

(b) The shapes of all five \(d\)-orbitals are similar;

(c) The shapes of the first four orbitals are similar but that of the fifth orbital is different;

(d) Ths shapes of all five \(d\)-orbitals are different;

Q 4. If uncertainty in position and momentum are equal, then uncertainty in velocity is : [2008];

(a) \(\frac{1}{2 m} \sqrt{\frac{h}{\pi}}\);

(b) \(\sqrt{\frac{h}{2 \pi}}\);

(c) \(\frac{1}{m} \sqrt{\frac{h}{\pi}}\);

(d) \(\sqrt{\frac{h}{\pi}}\);

Q 5. Orbital having 3 angular nodes and 3 total nodes is [NEET Odisha 2019];

(a) \(6 d\);

(b) \(5 p\);

(c) \(3 d\);

(d) \(4 f\);

Q 6. The graph between \(|\psi|^{2}\) and \(r\) (radial distance) is shown below This represents;

(a) \(3 s\)-orbital;

(b) \(2 s\)-orbital;

(c) \(1 s\)-orbital;

(d) \(2 p\)-orbital;