Atomic and Nuclear physics Book Back Practice Test

12th Standard Physics — Atomic and Nuclear physics: Book Back Online Practice Test

Pick how many questions you want and set a time limit, then start. You'll get your score at the end with the correct answer and an explanation for every question. Free, in Tamil and English — 15 questions available.

Set up your test

Number of questions

Time limit

Time remaining00:00

Suppose an alpha particle accelerated by a potential of V volt is allowed to collide with a nucleus of atomic number Z, then the distance of closest approach of alpha particle to the nucleus is

A.14.4 \frac{Z}{V} \text{\AA} B.14.4 \frac{V}{Z} \text{\AA} C.1.44 \frac{Z}{V} \text{\AA} D.1.44 \frac{V}{Z} \text{\AA}

In a hydrogen atom, the electron revolving in the fourth orbit, has angular momentum equal to

A.h B.\frac{h}{\pi} C.\frac{4h}{\pi} D.\frac{2h}{\pi}

Atomic number of H-like atom with ionization potential 122.4 V for n = 1 is

A.1 B.2 C.3 D.4

The ratio between the radius of first three orbits of hydrogen atom is

A.1:2:3 B.2:4:6 C.1:4:9 D.1:3:5

The charge of cathode rays particle is

A.positive B.negative C.neutral D.not defined

In J.J. Thomson e/m experiment, electrons are accelerated through 2.6 kV enter the region of crossed electric field magnetic field of strength 3.0 × 10^4 Vm–1 and 1.0 × 10^–3 T, respectively, and pass through it and undeflected, then the specific charge is

A.1.6 × 10^{10} C kg^{–1} B.1.7 × 10^{11} C kg^{–1} C.1.5 × 10^{11} C kg^{–1} D.1.8 × 10^{11} C kg^{–1}

The ratio of the wavelengths radiation emitted for the transition from n =2 to n = 1 in Li++, He+ and H is

A.1: 2: 3 B.1: 4: 9 C.3:2:1 D.4: 9: 36

The electric potential of an electron is given by V = V_0 \ln(r/r_0), where r_0 is a constant. If Bohr atom model is valid, then variation of radius of nth orbit r_n with the principal quantum number n is

A.r_n \propto \frac{1}{n} B.r_n \propto n C.r_n \propto \frac{1}{n^2} D.r_n \propto n^2

If the nuclear radius of 27Al is 3.6 fermi, the approximate nuclear radius of 64Cu in fermi is

A.2.4 B.1.2 C.4.8 D.3.6

Q10

The nucleus is approximately spherical in shape. Then the surface area of nucleus having mass number A varies as

A.A^{2/3} B.A^{4/3} C.A^{1/3} D.A^{5/3}

Q11

The mass of a 3Li7 nucleus is 0.042 u less than the sum of the masses of all its nucleons. The average binding energy per nucleon of 3Li7 nucleus is nearly

A.46 MeV B.5.6 MeV C.3.9 MeV D.23 MeV

Q12

M_p denotes the mass of the proton and M_n denotes mass of a neutron. A given nucleus of binding energy B, contains Z protons and N neutrons. The mass M(N,Z) of the nucleus is given by (where c is the speed of light)

A.M(N,Z) = NM_n + ZM_p - Bc^2 B.M(N,Z) = NM_n + ZM_p + Bc^2 C.M(N,Z) = NM_n + ZM_p - B/c^2 D.M(N,Z) = NM_n + ZM_p + B/c^2

Q13

A radioactive nucleus (initial mass number A and atomic number Z) emits two alpha-particles and 2 positrons. The ratio of number of neutrons to that of proton in the final nucleus will be

A.\frac{A-Z-4}{Z-2} B.\frac{A-Z-2}{Z-6} C.\frac{A-Z-4}{Z-6} D.\frac{A-Z-12}{Z-4}

Q14

The half-life period of a radioactive element A is same as the mean life time of another radioactive element B. Initially both have the same number of atoms. Then

A.A and B have the same decay rate initially B.A and B decay at the same rate always C.B will decay at faster rate than A D.A will decay at faster rate than B

Q15

A radioactive element has N_0 number of nuclei at t=0. The number of nuclei remaining after half of a half-life (that is, at time t = \frac{1}{2} T_{1/2}) is

A.\frac{N_0}{2} B.\frac{N_0}{\sqrt{2}} C.\frac{N_0}{4} D.\frac{N_0}{8}

More for this chapter

About this Atomic and Nuclear physics test

This free online practice test covers Atomic and Nuclear physics from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

More chapters in Physics

View all