1. Who explained the splitting of special lines in magnetic field ?
(A) Zeeman
(B) Bohr
(C) Summerfield
(D) Einstein
| Answer тЗТ A |
2. The mass of a neutron is :
(A) 1.00866 u
(B) 1.0866 u
(C) 1.866 u
(D) 0.1866 u
| Answer тЗТ A |
3. Isobars have the same :
(A) A
(B) Z
(C) N
(D) All the above
| Answer тЗТ A |
4. Isotones have the same :
(A) A
(B) Z
(C) N
(D) All the above
| Answer тЗТ C |
5. Half-life of a substance depends on :
(A) pressure
(B) temperature
(C) density
(D) None of these
| Answer тЗТ D |
6. The concept of electron spin was introduced by :
(A) Becquerel
(B) Goudsmit
(C) Millikan
(D) Uhlenbeek and Goudsmit
| Answer тЗТ D |
7. The principle that a quantum orbital cannot be occupied by more than two electrons was given by :
(A) Pauli
(B) Millikan
(C) Hund
(D) None of these
| Answer тЗТ A |
8. The binding energy of 4/2He is about :
(A) 28.3 eV
(B) 28.3 MeV
(C) 28.3 J
(D) 2.83 MeV
| Answer тЗТ B |
9. The binding energy of a deuteron is about :
(A) 2.22 MeV
(B) 2.22 J
(C) 2.22 eV
(D) None of these
| Answer тЗТ A |
10. If the atom 257/100 Fm follows. Bohr model and the radius of this atom is n times Bohr radius, then n will be :
(A) 100
(B) 200
(D) 100
(C) 1/100
| Answer тЗТ D |
11. The volume occupied by an atom is greater than the volume of the nucleus by a factor of about :
(A) 105
(B) 1010
(C) 1015
(D) 10
| Answer тЗТ C |
12. For Hydrogen atom, the ratio of energy in its first to second excited state is :
(A) 1/4
(B) 2/3
(C) 4/9
(D) 4/1
| Answer тЗТ C |
13. The shortest wavelength of X-rays emitted from an X-ray tube depend on the :
(A) current in the tube
(B) Voltage applied to the tube
(C) Nature fo the gas in the tube
(D) atomic number of target material
| Answer тЗТ B |
14. The speed of an electron in the orbit of hydrogen atom in ground state is :
(A) C
(B) C/2
(C) C/10
(D) C/137
| Answer тЗТ D |
15. The unit is defined as 1/12 of the mass of a carbon-12 atom and is symbolised as u. lu
u is equal to :
(A) 1.66 x 10-27 kg
(B) 1.66 x 10-24 kg
(C) 166 x 10-22 kg
(D) None of these
| Answer тЗТ A |
16. Who discovered the positron ?
(A) Chadwick
(B) Bohr
(C) Maxwell
(D) Anderson
| Answer тЗТ D |
17. The mass of proton is about :
(A) 9.11 x 10-31 kg
(B) 9.11 x 10-30 kg
(C) 1.66 x 10-27 kg
(D) 1 kg
| Answer тЗТ C |
Class 12th physics objective question in English
| S.N | Physics Objective English Medium |
| 1. | ┬аELECTRIC CHARGES AND FIELDS |
| 2. | LECTROSTATIC POTENTIAL AND CAPACITANCE |
| 3. | CURRENT ELECTRICITY |
| 4. | MOVING CHARGES AND MAGNETISM |
| 5. | MAGNETISM AND MATTER |
| 6. | ELECTROMAGNETIC INDUCTION |
| 7. | ALTERNATING CURRENT |
| 8. | ELECTROMAGNETIC WAVES |
| 9. | RAY OPTICS AND OPTICAL INSTRUMENTS |
| 10. | WAVE OPTICS |
| 11. | DUAL NATURE OF MATTER AND RADIATION |
| 12. | ATOMS |
| 13. | NUCLEI |
| 14. | SEMI CONDUCTOR ELECTRONICS┬а |
| 15. | COMMUNICATION SYSTEMS |
