Major Competitive Exams

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Q. If the wavelength of light in a vacuum is 600 nm, what is its wavelength in glass (n = 1.5)?
  • A. 400 nm
  • B. 600 nm
  • C. 900 nm
  • D. 300 nm
Q. If the wavelength of light in air is 600 nm, what is its wavelength in glass (n=1.5)?
  • A. 400 nm
  • B. 450 nm
  • C. 600 nm
  • D. 900 nm
Q. If the wavelength of light in vacuum is 600 nm, what is its wavelength in water (n = 1.33)? (2023)
  • A. 450 nm
  • B. 600 nm
  • C. 750 nm
  • D. 800 nm
Q. If the wavelength of light is halved, what happens to its frequency? (2021)
  • A. It is halved
  • B. It remains the same
  • C. It is doubled
  • D. It is quadrupled
Q. If the wavelength of light is halved, what happens to the energy of the photons? (2020)
  • A. It is halved
  • B. It is doubled
  • C. It remains the same
  • D. It is quadrupled
Q. If the wavelength of light is halved, what happens to the frequency of the light?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the position of the minima?
  • A. They move closer together
  • B. They move further apart
  • C. They remain unchanged
  • D. They disappear
Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the position of the first diffraction minimum?
  • A. It moves closer to the center
  • B. It moves further from the center
  • C. It remains unchanged
  • D. It disappears
Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the angular position of the first minimum in a single-slit diffraction pattern?
  • A. It remains the same
  • B. It doubles
  • C. It halves
  • D. It quadruples
Q. If the wavelength of light used in a diffraction experiment is increased, what happens to the diffraction pattern?
  • A. It becomes sharper
  • B. It becomes broader
  • C. It remains unchanged
  • D. It disappears
Q. If the wavelength of light used in a diffraction grating is increased, what happens to the angular separation of the fringes? (2023)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. If the wavelength of light used in a double-slit experiment is 600 nm and the distance between the slits is 0.3 mm, what is the distance between the first and second bright fringes on the screen placed 2 m away?
  • A. 0.4 m
  • B. 0.6 m
  • C. 0.8 m
  • D. 0.2 m
Q. If the wavelength of light used in a double-slit experiment is increased, what happens to the position of the interference fringes?
  • A. Fringes move closer together
  • B. Fringes move further apart
  • C. Fringes disappear
  • D. Fringes become brighter
Q. If the wavelength of light used in a double-slit experiment is increased, what happens to the fringe separation? (2022)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. If the wavelength of light used in a double-slit experiment is increased, what happens to the distance between the fringes? (2022)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. If the wavelength of light used in a single-slit diffraction experiment is increased, what will happen to the position of the first minimum? (2022)
  • A. It moves closer to the center
  • B. It moves away from the center
  • C. It remains unchanged
  • D. It disappears
Q. If the wavelength of light used in a single-slit diffraction experiment is increased, what happens to the width of the central maximum? (2023)
  • A. It decreases
  • B. It increases
  • C. It remains the same
  • D. It becomes zero
Q. If the wavelength of light used in an interference experiment is 500 nm, what is the fringe separation when the screen is placed 2 m away from the slits separated by 0.1 mm?
  • A. 0.01 m
  • B. 0.025 m
  • C. 0.05 m
  • D. 0.1 m
Q. If the wavelength of light used in Young's experiment is 600 nm and the distance between the slits is 0.1 mm, what is the distance between the first and second bright fringes on a screen 2 m away?
  • A. 0.12 m
  • B. 0.24 m
  • C. 0.36 m
  • D. 0.48 m
Q. If the wavelength of light used in Young's experiment is 600 nm, what is the fringe width when the distance between the slits is 0.1 mm and the distance to the screen is 2 m?
  • A. 0.03 mm
  • B. 0.06 mm
  • C. 0.12 mm
  • D. 0.15 mm
Q. If the weight of an object is measured as 50.0 kg with an uncertainty of 0.5 kg, what is the relative error?
  • A. 1%
  • B. 0.5%
  • C. 2%
  • D. 0.1%
Q. If the Wheatstone bridge is balanced, what is the potential difference across the galvanometer?
  • A. Maximum.
  • B. Minimum.
  • C. Zero.
  • D. Equal to the supply voltage.
Q. If the Wheatstone bridge is unbalanced, what can be inferred about the potential difference across the galvanometer?
  • A. It is zero
  • B. It is positive
  • C. It is negative
  • D. It is non-zero
Q. If the Wheatstone bridge is unbalanced, what can be inferred about the resistances?
  • A. R1/R2 = R3/R4
  • B. R1/R2 ≠ R3/R4
  • C. R1 + R2 = R3 + R4
  • D. R1 - R2 = R3 - R4
Q. If the Wheatstone bridge is unbalanced, what can be said about the potential difference across the galvanometer?
  • A. It is zero.
  • B. It is maximum.
  • C. It is equal to the supply voltage.
  • D. It is constant.
Q. If the Wheatstone bridge is unbalanced, what happens to the current through the galvanometer?
  • A. It becomes zero.
  • B. It increases.
  • C. It decreases.
  • D. It becomes infinite.
Q. If the width of a river is 200 meters and the depth is 5 meters, what is the volume of water in one kilometer length of the river? (2021)
  • A. 100,000 m³
  • B. 1,000,000 m³
  • C. 500,000 m³
  • D. 200,000 m³
Q. If the width of a river is 200 meters and the depth is 5 meters, what is the volume of water in cubic meters that flows through the river in one second if the velocity of the water is 3 m/s?
  • A. 3000
  • B. 1000
  • C. 6000
  • D. 5000
Q. If the wind is blowing from the north at 10 km/h, what is the wind direction?
  • A. North
  • B. South
  • C. East
  • D. West
Q. If the word 'CAT' is coded as '3120', what is the code for 'DOG'?
  • A. 415
  • B. 416
  • C. 417
  • D. 418
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