MCQOPTIONS
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MCQOPTIONS
This section includes 36 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A device based on photoelectric effect is called |
| A. | Photo sensitive detection |
| B. | Photo diode |
| C. | Photosynthesis |
| D. | Photo cell |
| Answer» E. | |
| 2. |
A photon is |
| A. | A unit of energy |
| B. | A positively charged particle |
| C. | A quantum of electromagnetic radiation |
| D. | A unit of wavelength |
| Answer» D. A unit of wavelength | |
| 3. |
A photon of wave length 900nm behaves like a particle of mass |
| A. | 5.53 x 10-36kg |
| B. | 0 kg. |
| C. | 2.46 x 10-36kg |
| D. | 1.84 x 10-44kg |
| Answer» D. 1.84 x 10-44kg | |
| 4. |
A three dimensional image is obtained by |
| A. | Electron microscope |
| B. | Seanning electron microscope |
| C. | Magnetic imaging |
| D. | None of the above |
| Answer» C. Magnetic imaging | |
| 5. |
A transmitting station emits radio waves of wavelength ? at power P. If h is Plancks constant & c the speed of light what is the rate of emission of photons? |
| A. | C |
| Answer» A. C | |
| 6. |
After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light |
| A. | Increases because wavelength decreases |
| B. | Decreases because speed decreases |
| C. | Remains same |
| D. | Increases then decreases |
| Answer» D. Increases then decreases | |
| 7. |
The existence of Ether wind was experimentally rejected by |
| A. | Equal to its rest mass |
| B. | Double of its rest mass |
| C. | Infinite |
| D. | Zero |
| Answer» D. Zero | |
| 8. |
Linear momentum of a photon is |
| A. | Zero |
| B. | Hv/c2 |
| C. | Hv/c |
| D. | C2/hv |
| Answer» B. Hv/c2 | |
| 9. |
The linear momentum of an X-ray photon of wavelength 0.1A is |
| A. | 6.625x1023N-s |
| B. | 66.25x1023N-s |
| C. | 662.5x1023N-s |
| D. | Data is insufficient |
| Answer» B. 66.25x1023N-s | |
| 10. |
The name of the photon for quantum of light was proposed by |
| A. | Ampere |
| B. | Plank |
| C. | Thomson |
| D. | Einstein |
| Answer» E. | |
| 11. |
The relativistic energy E is equivalent to relativistic mass given by |
| A. | Ec2 |
| B. | E/c2 |
| C. | E/c |
| D. | C2/E |
| Answer» C. E/c | |
| 12. |
The uncertainty in momentum & position is due to its |
| A. | Property of matter and radiation. |
| B. | Two dimensional motion. |
| C. | Emission of certain wavelength |
| D. | Very high velocity. |
| Answer» B. Two dimensional motion. | |
| 13. |
The velocity of a particle of mass m of de-Broglie wavelength ? is |
| A. | D |
| Answer» A. D | |
| 14. |
Tick the right statement. |
| A. | No photo electronic emission takes place if the frequency of radiation however intense it may be is less than a certain critical value called threshold frequency |
| B. | Threshold frequency depends upon the nature of the metal surface |
| C. | Maximum energy of a photoelectron is a function of frequency rather than intensity of radiation |
| D. | All of the above |
| Answer» E. | |
| 15. |
Which one of the following has the largest energy content? |
| A. | 103 photons of wavelength 2pm (?-rays). |
| B. | 102 photons of wavelength 1nm (x-rays). |
| C. | 106 photons of wavelength 50?m (infrared). |
| D. | 106 photons of wavelength 200nm (UV). |
| Answer» B. 102 photons of wavelength 1nm (x-rays). | |
| 16. |
If a material object moves with speed of light its mass becomes |
| A. | Equal to its rest mass |
| B. | Double of its rest mass |
| C. | Infinite |
| D. | Zero |
| Answer» D. Zero | |
| 17. |
If a photon is reflected from the mirror then the change in momentum of each photon is |
| A. | Zero |
| B. | B |
| Answer» A. Zero | |
| 18. |
If n number of photon are striking on a metal surface then total momentum exerted is |
| A. | A |
| Answer» A. A | |
| 19. |
If the wavelength of incident radiation is increased in photoemission then |
| A. | The maximum kinetic energy of the photoelectrons increases. |
| B. | The minimum kinetic energy of the photoelectrons decreases. |
| C. | The minimum kinetic energy of the photoelectrons increases. |
| D. | The average kinetic energy of the photoelectrons decreases. |
| Answer» E. | |
| 20. |
In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron |
| A. | Becomes double |
| B. | Remains same |
| C. | Becomes half |
| D. | First increases then decreases because curvilinear graph |
| Answer» C. Becomes half | |
| 21. |
In Compton scattering the change in wave length is max if |
| A. | Angle of scattering is 90? |
| B. | Angle of scattering is 60? |
| C. | Angle of scattering is 180? |
| D. | Angle of scattering is zero |
| Answer» D. Angle of scattering is zero | |
| 22. |
In electron microscope electric & magnetic fields are used as |
| A. | Electromagnetic gun. |
| B. | Source of electromagnetic waves. |
| C. | Deflecting charged particle |
| D. | Converging source of electrons. |
| Answer» E. | |
| 23. |
In Davisson-Germer experiment the diffracted proton from crystal shows |
| A. | Particle property |
| B. | Wave property |
| C. | Light property |
| D. | Quantum property |
| Answer» C. Light property | |
| 24. |
In electron microscope we use energetic particles because of |
| A. | Penetrating power is high |
| B. | Kinetic energy is large. |
| C. | Wavelength is very short. |
| D. | All the above reasons. |
| Answer» D. All the above reasons. | |
| 25. |
Mark the wrong statement. |
| A. | A frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference |
| B. | An un-accelerated frame of reference is called an inertial frame of reference |
| C. | All the frames of reference in uniform rectilinear motion are equivalent |
| D. | Newtons laws of motion are valid in an accelerated (non inertial) frame of reference |
| Answer» E. | |
| 26. |
Select an alternative from of uncertainly principle from the following |
| A. | ?? = h/m?c(1-cos ?) |
| B. | ?E . ?t = h |
| C. | Mc2 = hv |
| D. | Any of above |
| Answer» C. Mc2 = hv | |
| 27. |
Stopping potential for a metal surface in case of photoelectric emission depends on |
| A. | The threshold frequency for the metal surface |
| B. | The intensity of incident light |
| C. | The frequency of incident light and work function of the metal surface |
| D. | All of the above |
| Answer» D. All of the above | |
| 28. |
The energy radiated is directly proportional to fourth power of Kelvins temperature is |
| A. | Karl-weins law |
| B. | Rayleigh Jeans law. |
| C. | Stephens law. |
| D. | Plancks |
| Answer» D. Plancks | |
| 29. |
Einsteins photoelectric equation is given by |
| A. | 1/2 mvmax2=hf+? |
| B. | 1/2 mvmax2-hf = ? |
| C. | 1/2 mvmax2=hf-? |
| D. | All of above are correct |
| Answer» D. All of above are correct | |
| 30. |
An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is |
| A. | Greater than one meter |
| B. | Less than one meter |
| C. | One meter |
| D. | A foolish question |
| Answer» C. One meter | |
| 31. |
As the temperature of black body is raised the wavelength corresponding to maximum intensity |
| A. | Shifts towards longer wavelength |
| B. | Shifts towards shorter wavelength |
| C. | Remain the same |
| D. | Shifts towards longer as well as shorter wavelengths |
| Answer» C. Remain the same | |
| 32. |
Compton effect proves the |
| A. | Photon theory of light |
| B. | Dual nature of light |
| C. | Wave nature of light |
| D. | Uncertain nature of light |
| Answer» B. Dual nature of light | |
| 33. |
Davison Germer experiment indicates |
| A. | Interference |
| B. | Polarization |
| C. | Election diffraction |
| D. | Refraction |
| Answer» D. Refraction | |
| 34. |
Electron moves in the orbit as |
| A. | Simple vibratory motion. |
| B. | Standing wave motion. |
| C. | Vibratory motion like up and down. |
| D. | S.H.M like sound. |
| Answer» C. Vibratory motion like up and down. | |
| 35. |
For confinement of electron in a box of radius 10-14m the electron speed should be |
| A. | 107m/sec |
| B. | Should be greater than speed of light. |
| C. | Be zero |
| D. | Not be wavelike. |
| Answer» C. Be zero | |
| 36. |
If a diffraction grating is placed in the path of a light beam it reveals |
| A. | Wave property |
| B. | Particle property |
| C. | Energy particle |
| D. | Electromagnetic wave property |
| Answer» B. Particle property | |