13. NUCLEI( Objective Question Answer 2022 )
1. How many electrons are contained in 23892U nucleus ?
Download (A) 92
(B) 146
(C) 238
(D) O
| Answer тЗТ D |
2. Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of :
(A) electron
(B) proton
(C) neutron
(D) None of these
| Answer тЗТ C |
3. The density of a nucleus is of the order of:
(A) 1015 kg m-3
(B) 1018 kg m-3
(C) 1017 kg m-3
(D) 1016 kg m-3
| Answer тЗТ C |
4. In the given reaction :
radioactive radiations are emitted in the sequence
(A) тИЭ, ╬▓, ╧Т
(B) ╬▓, тИЭ, ╧Т
(C) ╧Т, тИЭ, ╬▓
(D) ╬▓, ╧Т, тИЭ
| Answer тЗТ B |
5. When the mass of a sample of a radioactive substance decreases, the mean life of the sample :
(A) increases
(B) decreases
(C) remain unchanged
(D) first decreases then increases
| Answer тЗТ C |
6. The order of nuclear density is :
(A) 103
(B) 1017
(C) 106
(D) None
| Answer тЗТ B |
7. The isotope generally used for the treatment of cancer is :
(A) I131
(B) Hg197
(C) O15
(D) Co60
| Answer тЗТ D |
8. What percentage of radioactive substance is left after 5 half lives ?
(A) 3.125 %
(B) 6.25 %
(C) 12.33 %
(D) 31 %
| Answer тЗТ A |
9. Mass is converted into energy according to the relation:
(A) E = me2
(B) E = mgh
(C) E = 1/2me2
(D) E = mgH/C2
| Answer тЗТ A |
10. The helium atom does not contain :
(A) two protons
(B) two electrons
(C) two neutrons
(D) six nucleons
| Answer тЗТ D |
11. The more readily fissionable isotope of uranium has an atomic mass of :
(A) 234
(B) 235
(C) 236
(D) 238
| Answer тЗТ B |
12. Energy of electron in the 1st orbit of H-atom is :
(A) -13.6 MeV
(B) тАУ13.6 eV
(C) тАУ13.6 J
(D) 13.6 J
| Answer тЗТ B |
13. The mass no. of a nucleus is M and its atomic no. is z. The number of neutrons in the nucleus is :
(A) M – Z
(B) M
(C) Z
(D) M + Z
| Answer тЗТ A |
14. The phenomena of radioactivity is :
(A) Exothermic change with increase or decrease with temperature
(B) increases on applied pressure
(C) nuclear process does not depend on external factors
(D) None of these
| Answer тЗТ C |
15. What percentage of original radioactive atom is left after four half life ?
(A) 6%
(B) 10%
(C) 20%
(D) 25%
| Answer тЗТ A |
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 |
