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