# Physics MCQ (Multiple Choice Questions) - SchoolingAxis

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

a. Ampere

b. Plank

c. Thomson

d. 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

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

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

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

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

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

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

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

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

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

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

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

Que- A three-dimensional image is obtained by________________?

a. Electron microscope

b. Scanning electron microscope

c. Magnetic imaging

d. None of the above

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

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

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

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

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

Que- The diameter of a lens is called________________?

a. focal length

b. principal axis

c. aperture

Que- Unit of power of a lens is________________?

a. meter

b. watt

c. diopter

d. horsepower

Que- The power of a concave lens is_______________?

a. real

b. virtual

c. positive

d. 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

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

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

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

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

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

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

a. fo + fe

b. fo – fe

c. fo / fe

d. fe / fo

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

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

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

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

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

Que- The value of critical angle for glass is_______________?

a. 42°

b. 47°

c. 52°

d. 50°

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

a. Diodes

b. Repeaters

c. Laser

d. Transformer

Que- Magnification of the astronomical telescope is_____________?

a. fo+fe

b. fo/fe

c. fe/fo

d. (1+fo/fe)L/fo

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

a. Multimode index fiber

c. Single mode step index fiber

d. Copper wire

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

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

a. C = 4fd

b. C = 8fd

c. C = 16fd

d. C = 5/2fd

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

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

a. Newton

b. Einstein

c. Raleigh

d. Planks

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

a. spectrometer

b. galvanometer

c. interferometer

d. none of these

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

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

a. 10-10s

b. 10-8s

c. 10-6s

d. 10-9s

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

Que- Total number of series in hydrogen spectrum is_____________?

a. three

b. four

c. five

d. six

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

a. band spectrum

b. line spectrum

c. continuous spectrum

d. absorption 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

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

a. photo electric effect

b. ionization

d. any of above

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