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Physics Objective Type MCQs Test For Entry Tests
Solved Physics Question Answers Objective Type MCQs
Q.1: The linear momentum of an X-ray photon of wavelength 0.1A is-------- ?
- 6.625x1023N-s
- 66.25x1023N-s
- 662.5x1023N-s
- data is insufficient
A
Q.2: In Compton scattering, the change in wavelength is maxed if-------- ?
- The angle of scattering is 90°
- The angle of scattering is 60°
- The angle of scattering is 180°
- The angle of scattering is 0
C
Q.3: The especially designed semiconductor diodes used as indicator lamps in electronic circuits are------- ?
- The switch
- The light emitting diode
- The photo diodes
- Solar cells.
B
Q.4: After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light------- ?
- Increases because wavelength decreases
- Decreases because speed decreases
- Remains same
- Increases then decrease
C
Q.5: A photon of wavelength 900nm behaves like a particle of mass-------- ?
- 5.53 x 10-36kg
- 0 kg.
- 2.46 x 10-36kg
- 1.84 x 10-44kg
C
Q.6: Which one of following band is completely filled in case of conductors ?
- Conduction band
- Fermi band
- Valence band
- Forbidden band
A
Q.7: In the electron microscope, electric & magnetic fields are used as-------- ?
- Electromagnetic gun
- Source of electromagnetic waves
- Deflecting charged particle
- Converging source of electrons
D
Q.8: Compton effect proves the---------- ?
- Photon theory of light
- Dual nature of light
- Wave nature of light
- Uncertain nature of light
A
Q.9: The power of a concave lens is---------- ?
- real
- virtual
- positive
- negative
D
Q.10: In multimode step index fibre the refractive index of core and cladding is------- ?
- same
- different
- zero
- different with refractive index of core higher than cladding
D
Q.11: A convex lens gives a virtual image only when the objects lies--------- ?
- between principal focus and center of curvature
- beyond 2 f
- at the principal focus
- between principal focus and optical center
D
Q.12: Magnification of the astronomical telescope is--------- ?
- fo+fe
- fo/fe
- fe/fo
- (1+fo/fe)L/fo
B
Q.13: Michelson calculated the speed of light using the instruments---------- ?
- spectrometer
- galvanometer
- interferometer
- none of these
A
Q.14: X-ray are---------- ?
- of unknown nature
- high energy electrons
- high energy photons
- radio isotopes
C
Q.15: In full wave rectification the output voltage across the load is obtained for------- ?
- The positive half cycle of input A.C.
- The negative half cycle of input A.C.
- The complete cycle of input A.
- All of the above.
C
Q.16: When we excite some atoms by heat collision or electrical discharge they will----------- ?
- radiate electromagnetic energy with a continuous distribution of wavelength
- absorb particular wavelengths when white light is incident on them
- radiate electromagnetic energy of discrete characteristic wavelength
- emit either invisible or visible light
C
Q.17: Radiation with wavelength longer than red lights------- ?
- ultraviolet rays
- X-rays
- infra red radiation
- visible radiation
C
Q.18: The minimum wavelength of X-rays can further be reduced by ---------- ?
- Reducing the pressure or cooling the target
- Increasing the temperature of the filament.
- Using a target element of higher atomic number
- Increasing the potential difference between the cathode and the target
D
Q.19: Wave-like characteristic of electron is demonstrated by------- ?
- Line spectrum of atoms
- Production of x-rays.
- Diffraction by crystalline solids
- Photoelectric effect
C
Q.20: p-n junction when reversed biased acts as a---------- ?
- capacitor
- inductor
- on switch
- off switch
D
