Physics MCQ (Multiple Choice Questions) - SchoolingAxis

Physics MCQ (Multiple Choice Questions)

 Que- The name of the photon for quantum of light was proposed by________________?  

a. Ampere  

b. Plank  

c. Thomson  

d. Einstein 

Answer- Einstein

Que- In Compton scattering, the change in wavelength is maxed if_______________?  

a. The angle of scattering is 90°  

b. The angle of scattering is 60°  

c. The angle of scattering is 180°  

d. The angle of scattering is 0 

Answer- The angle of scattering is 180°

Que- Davison Germer experiment indicates__________________?  

a. Interference  

b. Polarization  

c. Electron diffraction  

d. Refraction 

Answer- Electron diffraction

Que- 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- A quantum of electromagnetic radiation

Que- Which one of the following has the largest energy content ?  

a. 103 photons of wavelength 2 pm (γ-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- 103 photons of wavelength 2 pm (γ-rays)

Que- A transmitting station emits radio waves of wavelength λ at power P. If h is Planck's constant & c the speed of light what is the rate of emission of photons ?  

a. λ  

b. Speed of sound  

c. Speed of light 

d. h 

Answer- Speed of light

Que- 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 decrease 

Answer- Remains same

Que- 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 decrease because of the curvilinear graph 

Answer- Remains same

Que- 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- The average kinetic energy of the photoelectrons decreases

Que- If a photon is reflected from the mirror then the change in momentum of each photon is_______________?  

a. Zero  

b. Double  

c. Half  

d. 1 

Answer- Double

Que- If n number of the photon is striking on a metal surface then total momentum exerted is_______________?  

a. p  

b. n  

c. 0  

d. None 

Answer- p

Que- A photon of wavelength 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- 2.46 x 10-36kg

Que- The velocity of a particle of mass m of de-Broglie wavelength λ is______________?  

a. v = 3 ×× 106 ms-1  

b. v = 2 ×× 10 ms-1  

c. v = 2 ×× 6 ms-1  

d. v = 2 ×× 106 ms-1 

Answer- v = 2 ×× 106 ms-1

Que- In Davisson-Germer experiment the diffracted proton from crystal shows______________?  

a. Particle property  

b. Wave property  

c. Light property  

d. Quantum property 

Answer- Wave property

Que- 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- Wave property

Que- In an 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- Wavelength is very short

Que- In the 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- Converging source of electrons

Que- A three-dimensional image is obtained by________________?  

a. Electron microscope  

b. Scanning electron microscope  

c. Magnetic imaging  

d. None of the above 

Answer- Scanning electron microscope

Que- The uncertainty in momentum & position is due to its_____________?  

a. Property of matter and radiation  

b. Two-dimensional motion  

c. Emission of the certain wavelength  

d. Very high velocity 

Answer- Property of matter and radiation

Que- For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?  

a. 107m/sec  

b. Should be greater than the speed of light.  

c. Be zero  

d. Not be wave-like 

Answer- Should be greater than the speed of light.

Que- The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________?  

a. Karl-Weins law  

b. Rayleigh-Jeans law  

c. Stephens law  

d. Plancks 

Answer- Stephens law

Que- 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- Photon theory of light

Que- 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 likes the sound 

Answer- Standing wave motion

Que- A lens which converges a beam of parallel rays to a point is called______________?  

a. diverging (or concave) lens  

b. converging (or convex) lens  

c. plano concave lens  

d. plano convex lens 

Answer- converging (or convex) lens

Que- The diameter of a lens is called________________?  

a. focal length  

b. principal axis  

c. aperture  

d. radius of curvature 

Answer- principal axis

Que- Unit of power of a lens is________________?  

a. meter  

b. watt  

c. diopter  

d. horsepower 

Answer- diopter

Que- The power of a concave lens is_______________?  

a. real  

b. virtual  

c. positive  

d. negative 

Answer- negative

Que- If an object is placed away from 2f of a converging lens then the image will be_______________?  

a. real and erect  

b. virtual and erect  

c. real and inverted  

d. virtual 

Answer- real and inverted

Que- Magnifying power of simple microscope______________?  

a. increase with increase in focal length  

b. increase with decrease in focal length  

c. no effect with decrease or increase with focal length  

d. list distance of distinct vision 

Answer- increase with decrease in focal length

Que- The least distance of distinct vision for a normal eye is_______________?  

a. 15 cm  

b. 25 cm  

c. 30 cm  

d. 40 cm 

Answer- 25 cm

Que- If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________?  

a. chromatic aberration  

b. spherical aberration  

c. both spherical and chromatic  

d. distortion 

Answer- spherical aberration

Que- A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?  

a. f2 + f1  

b. f2 – f1  

c. f1f2/f2+f1  

d. f1f2/f1-f2 

Answer- f1f2/f1-f2

Que- In multimode step index fibre the refractive index of core and cladding is____________?  

a. same  

b. different  

c. zero  

d. different with refractive index of core higher than cladding 

Answer- different with refractive index of core higher than cladding

Que- Final image produced by a compound microscope is_____________?  

a. real and inverted  

b. real and erect  

c. virtual and erect  

d. virtual and inverted 

Answer- virtual and inverted

Que- For normal adjustment, length of astronomical telescope is______________?  

a. fo + fe  

b. fo – fe  

c. fo / fe  

d. fe / fo 

Answer- fo + fe

Que- Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?  

a. zero  

b. focus  

c. 2 f  

d. f/2 

Answer- f/2

Que- Least distance of distinct vision_____________?  

a. increases with increase in age  

b. decreases with increase in age  

c. neither increases nor decreases  

d. becomes infinite after 60 years 

Answer- increases with increase in age

Que- Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?  

a. 0.5  

b. 0.2  

c. 1  

d. 2 

Answer- 2

Que- A convex lens gives a virtual image only when the objects lies_________________?  

a. between principal focus and center of curvature  

b. beyond 2 f  

c. at the principal focus  

d. between principal focus and optical center 

Answer- between principal focus and optical center

Que- The minimum distance between an object and its real image in a convex lens is_____________?  

a. 2 f  

b. 2.5 f  

c. 3f  

d. 4f 

Answer- 4f

Que- Dioptre power of an concave lens of 10 cm focal length is_______________?  

a. 10 dioptre  

b. 10 dioptre  

c. 1 / 10 dioptre  

d. 1 / 10 dioptre 

Answer- 10 dioptre

Que- A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________?  

a. center of curvature  

b. focus  

c. optical center  

d. aperture 

Answer- focus

Que- The value of critical angle for glass is_______________?  

a. 42°  

b. 47°  

c. 52°  

d. 50° 

Answer- 42°

Que- In optic fiber transmission system _____________ are used regenerate the dim light signal?  

a. Diodes  

b. Repeaters  

c. Laser  

d. Transformer 

Answer- Repeaters

Que- Magnification of the astronomical telescope is_____________?  

a. fo+fe  

b. fo/fe  

c. fe/fo  

d. (1+fo/fe)L/fo 

Answer- fo/fe

Que- Errors in the transmission of power through optic fiber can be minimized by using a______________?  

a. Multimode index fiber  

b. Graded index fiber  

c. Single mode step index fiber  

d. Copper wire 

Answer- Graded index fiber

Que- The function of collimeter in spectrometer is________________?  

a. to produce parallel beams of light  

b. to filter the light rays  

c. to make them  

d. no function 

Answer- to produce parallel beams of light

Que- In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?  

a. 300km  

b. 200km  

c. 100km  

d. 20km 

Answer- 100km

Que- Michelson devised the formula to calculate the speed of light_______________?  

a. C = 4fd  

b. C = 8fd  

c. C = 16fd  

d. C = 5/2fd 

Answer- C = 16fd

Que- A convex lens acts as a diverging lens if the_________________?  

a. object is beyond C  

b. if the object is with in C  

c. if the object is within f  

d. both B and C  

Answer- both B and C 

Que- The equation θ = 1.22 λ/D was devised by_______________?  

a. Newton  

b. Einstein  

c. Raleigh  

d. Planks 

Answer- Raleigh

Que- Michelson calculated the speed of light using the instruments______________?  

a. spectrometer  

b. galvanometer  

c. interferometer  

d. none of these 

Answer- spectrometer

Que- Ratio of the weight of H-atom to that of an electron is approximately______________?  

a. 18.336  

b. 1836  

c. 18360  

d. 183.6 

Answer- 1836

Que- In hydrogen spectrum which one of the following series lies in the ultraviolet region ?  

a. Balmer series  

b. Pfund series  

c. Bracket series  

d. Lymann series 

Answer- Lymann series

Que- Excited atoms return to their ground state in_______________?  

a. 10-10s  

b. 10-8s  

c. 10-6s  

d. 10-9s 

Answer- 10-8s

Que- Hydrogen atom does not emit X-rays because _________________?  

a. its energy levels are too close to each other  

b. its energy levels are too far apart  

c. it is too small in size  

d. it has a single electron 

Answer- it has a single electron

Que- X-ray are________________?  

a. of unknown nature  

b. high energy electrons  

c. high energy photons  

d. radio isotopes 

Answer- high energy photons

Que- Total number of series in hydrogen spectrum is_____________?  

a. three  

b. four  

c. five  

d. six 

Answer- five

Que- The radiations emitted form hydrogen filled discharge tube show____________?  

a. band spectrum  

b. line spectrum  

c. continuous spectrum  

d. absorption spectrum 

Answer- line spectrum

Que- Photon of highest frequency will be absorbed when transition takes place from_____________?  

a. 1st to 5th orbit  

b. 2nd to 5th orbit  

c. 3rd to 5th orbit  

d. 4th to 5th orbit 

Answer- 1st to 5th orbit

Que- In obtaining an X-ray photograph of our hand we use the principle of______________?  

a. photo electric effect  

b. ionization  

c. shadow photograph  

d. any of above 

Answer- shadow photograph

Que- When we excite some atoms by heat collision or electrical discharge they will________________?  

a. radiate electromagnetic energy with a continuous distribution of wavelength  

b. absorb particular wavelengths when white light is incident on them  

c. radiate electromagnetic energy of discrete characteristic wavelength  

d. emit either invisible or visible light 

Answer- radiate electromagnetic energy of discrete characteristic wavelength

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