Physics · Chapter 11 of 11

Modern Physics: BPSC & UPPCS Prelims PYQs

19 previous-year questions on Modern Physics. Each one opens to its answer and explanation.

1. 1. 70th BPSC Prelims 2024

   Which of the following radiation is used to get relief from body aches?

   1. AInfra-red radiation
   2. BUV radiation
   3. CVisible radiation
   4. DNone of these
   Answer and explanation →

2. 2. 70th BPSC Prelims 2024

   One of the properties associated with X-rays is that they can be deflected by

   1. ABoth electric and magnetic fields together
   2. BElectric fields only
   3. CMagnetic fields only
   4. DNone of the above
   Answer and explanation →

3. 3. 69th BPSC Prelims 2023

   In the universe, what are pulsars?

   1. AA group of stars
   2. BRotating neutron stars
   3. CExplosion of a star
   4. DRadio waves emitted by a star
   Answer and explanation →

4. 4. 69th BPSC Prelims 2023

   A photoelectric cell is a device which

   1. Aconverts light energy into electric energy
   2. Bconverts electric energy into light energy
   3. Cstores light energy
   4. DNone of the above
   Answer and explanation →

5. 5. 68th BPSC Prelims 2023

   Which of the following laboratories claimed a historic nuclear fusion breakthrough in December 2022?

   1. ALos Alamos National Laboratory
   2. BLawrence Livermore National Laboratory
   3. COak Ridge National Laboratory
   4. DMore than one of the above
   5. ENone of the above
   Answer and explanation →

6. 6. 68th BPSC Prelims 2023

   Which among the following is a positively charged particle emitted by a radioactive element?

   1. ACathode ray
   2. BBeta ray
   3. CAlpha ray
   4. DMore than one of the above
   5. ENone of the above
   Answer and explanation →

7. 7. 67th BPSC Prelims 2022

   The 'theory of relativity' is presented by which scientist?

   1. AIsaac Newton
   2. BStephen Hawking
   3. CMarie Curie
   4. DAlbert Einstein
   5. ENone of the above/More than one of the above
   Answer and explanation →

8. 8. 67th BPSC Prelims 2022

   Hydrogen bomb is based on the principle of

   1. Acontrolled fusion reaction
   2. Buncontrolled fusion reaction
   3. Ccontrolled fission reaction
   4. Duncontrolled fission reaction
   5. ENone of the above/More than one of the above
   Answer and explanation →

9. 9. UPPSC Prelims 2022

   Solar energy is converted into electric energy through

   1. ADry cells
   2. BLeclanche cells
   3. CVoltaic cells
   4. DPhoto voltaic cells
   Answer and explanation →

10. 10. UPPSC Prelims 2021

    Which of the following particles has zero charge?

    1. APositron
    2. BNeutrino
    3. CElectron
    4. Dα-particle
    Answer and explanation →

11. 11. 66th BPSC Prelims 2020

    The radiation used in the treatment of muscle ache are

    1. Ainfrared
    2. Bmicrowave
    3. CUV
    4. DX-ray
    5. ENone of the above / More than one of the above
    Answer and explanation →

12. 12. UPPSC Prelims 2018

    Which of the following has the highest velocity?

    1. ACosmic rays
    2. BLight
    3. CElectron
    4. DSupersonic wave
    Answer and explanation →

13. 13. UPPSC Prelims 2018

    Which of the following was invented by Wilhelm Roentgen?

    1. ARadio
    2. BX - Ray Machine
    3. CElectric Bulb
    4. DNone of the above
    Answer and explanation →

14. 14. UPPSC Prelims 2016

    Which one of the following is used in the treatment of blood cancer?

    1. AIodine - 131
    2. BSodium - 24
    3. CPhosphorus - 32
    4. DCobalt - 60
    Answer and explanation →

15. 15. UPPSC Prelims 2016

    The substance used as moderator and coolant both, in nuclear reactors is

    1. AOrdinary water
    2. BHeavy water
    3. CLiquid Ammonia
    4. DLiquid Hydrogen
    Answer and explanation →

16. 16. UPPSC Prelims 2016

    Photovoltaic cells are

    1. ASolar cells
    2. BThermal cells
    3. CSulphur cells
    4. DMolar cells
    Answer and explanation →

17. 17. 56th–59th BPSC Prelims 2014

    Cosmic rays

    1. Aare charged particles
    2. Bare uncharged particles
    3. Ccan be charged as well as uncharged
    4. DNone of the above
    Answer and explanation →

18. 18. UPPSC Prelims 2012

    Laser is a device for producing

    1. ASpontaneous radiation
    2. BDispersed radiation
    3. CScattered radiation
    4. DStimulated radiation
    Answer and explanation →

19. 19. 45th BPSC Prelims 2001

    Which of the following carries a negative charge?

    1. AX-rays
    2. BAlpha particles
    3. CBeta particles
    4. DGamma rays
    Answer and explanation →