Major Competitive Exams

Q. In a diffraction pattern, if the first minimum occurs at an angle of 30°, what is the ratio of the slit width to the wavelength?
  • A. 1:2
  • B. 1:√3
  • C. √3:1
  • D. 2:1
Q. In a diffraction pattern, the intensity of the central maximum is how many times that of the first minimum?
  • A. Zero
  • B. One
  • C. Infinity
  • D. Two
Q. In a diffraction pattern, the intensity of the central maximum is typically:
  • A. Zero
  • B. Minimum
  • C. Maximum
  • D. Constant
Q. In a diffraction pattern, what does the intensity of the central maximum depend on?
  • A. Wavelength only
  • B. Slit width only
  • C. Both wavelength and slit width
  • D. Distance from the slit
Q. In a diffraction pattern, what does the term 'fringe separation' refer to?
  • A. Distance between two minima
  • B. Distance between two maxima
  • C. Distance between a maximum and a minimum
  • D. None of the above
Q. In a diffraction pattern, what does the term 'order of diffraction' refer to?
  • A. The number of slits used
  • B. The number of maxima observed
  • C. The wavelength of light used
  • D. The distance to the screen
Q. In a diffraction pattern, what is the effect of increasing the slit width?
  • A. Wider central maximum
  • B. Narrower central maximum
  • C. No effect
  • D. Increased number of fringes
Q. In a diffraction pattern, what is the ratio of the intensity of the central maximum to that of the first minimum?
  • A. 1:0
  • B. 1:1
  • C. 1:2
  • D. 1:4
Q. In a digital communication system, what does the term 'bit rate' refer to?
  • A. The number of bits transmitted per second
  • B. The number of bits stored in a device
  • C. The frequency of the carrier wave
  • D. The duration of each bit
Q. In a diode, what is the region called where no charge carriers are present?
  • A. Conduction band
  • B. Valence band
  • C. Depletion region
  • D. N-type region
Q. In a diode, what is the region called where no current flows?
  • A. Forward bias
  • B. Reverse bias
  • C. Depletion region
  • D. Conduction region
Q. In a double convex lens, if the radii of curvature are 10 cm and 15 cm, what is the focal length using the lens maker's formula?
  • A. 6 cm
  • B. 10 cm
  • C. 12 cm
  • D. 8 cm
Q. In a double-slit experiment, if the distance between the screen and the slits is increased, what happens to the fringe separation?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. In a double-slit experiment, if the distance between the slits is 0.2 mm and the distance to the screen is 1 m, what is the fringe width for light of wavelength 600 nm?
  • A. 0.3 mm
  • B. 0.6 mm
  • C. 0.9 mm
  • D. 1.2 mm
Q. In a double-slit experiment, if the distance between the slits is 0.5 mm and the wavelength of light is 400 nm, what is the distance between the first and second bright fringes?
  • A. 0.4 m
  • B. 0.8 m
  • C. 1.2 m
  • D. 1.6 m
Q. In a double-slit experiment, if the distance between the slits is 0.5 mm and the distance to the screen is 2 m, what is the distance between the first and second bright fringes if the wavelength of light used is 500 nm?
  • A. 0.5 cm
  • B. 1 cm
  • C. 1.5 cm
  • D. 2 cm
Q. In a double-slit experiment, if the distance between the slits is doubled while keeping the wavelength constant, what happens to the fringe width?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
Q. In a double-slit experiment, if the distance between the slits is doubled, how does the fringe width change?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
Q. In a double-slit experiment, if the distance between the slits is doubled, what happens to the fringe separation on the screen?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. In a double-slit experiment, if the distance between the slits is doubled, what happens to the fringe width?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
Q. In a double-slit experiment, if the distance between the slits is halved, what happens to the fringe separation on the screen?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. In a double-slit experiment, if the distance between the slits is increased, what happens to the interference pattern?
  • A. Fringes become wider
  • B. Fringes become narrower
  • C. Fringes disappear
  • D. Fringes remain unchanged
Q. In a double-slit experiment, if the distance between the slits is increased, what happens to the number of visible fringes on the screen?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In a double-slit experiment, if the distance to the screen is increased, what happens to the fringe separation?
  • A. Fringe separation decreases
  • B. Fringe separation increases
  • C. Fringe separation remains the same
  • D. Fringe separation becomes zero
Q. In a double-slit experiment, if the distance to the screen is increased, what happens to the interference pattern?
  • A. Fringe width decreases
  • B. Fringe width increases
  • C. Fringe pattern disappears
  • D. Fringe spacing remains unchanged
Q. In a double-slit experiment, if the distance to the screen is increased, what happens to the fringe pattern?
  • A. Fringe width decreases
  • B. Fringe width increases
  • C. Fringe pattern disappears
  • D. Fringe pattern becomes sharper
Q. In a double-slit experiment, if the intensity of light at the center of the fringe pattern is I0, what is the intensity at the first minimum?
  • A. 0
  • B. I0
  • C. I0/2
  • D. I0/4
Q. In a double-slit experiment, if the screen distance is increased, what happens to the fringe separation?
  • A. Fringe separation increases
  • B. Fringe separation decreases
  • C. Fringe separation remains the same
  • D. Fringe separation becomes zero
Q. In a double-slit experiment, if the screen is moved further away from the slits, what happens to the fringe pattern?
  • A. Fringes become wider
  • B. Fringes become narrower
  • C. Fringe intensity increases
  • D. Fringe intensity decreases
Q. In a double-slit experiment, if the screen is moved further away from the slits, what effect does this have on the fringe spacing?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
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