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Latest NFSU NFAT MSc Environmental Science Exam Question (Objective Questions), MCQ in English

Subjects : Physics, Life Sciences, Environmental Science, Food Science and Forensic Science, Environmental Science

Question Bank NFAT M.Sc Environmental Science Exam - English
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Physics, Life Sciences, Environmental Science, Food Science and Forensic Science

Question 1Single Answer
What is the primary source of secondary wavelets according to Huygens' Principle?
  1. A
    Every point on a wavefront
  2. B
    The center of the wave
  3. C
    The edges of the wavefront
  4. D
    The medium particles
Question 2Single Answer
Which type of wave requires a medium to propagate?
  1. A
    Electromagnetic wave
  2. B
    Mechanical wave
  3. C
    Gravitational wave
  4. D
    Quantum wave
Question 3Single Answer
The Doppler Effect is observed as a change in:
  1. A
    Amplitude
  2. B
    Frequency
  3. C
    Intensity
  4. D
    Velocity
Question 4Single Answer
Which phenomenon is responsible for the colors seen in soap bubbles?
  1. A
    Diffraction
  2. B
    Polarization
  3. C
    Interference
  4. D
    Refraction
Question 5Single Answer
.The resolving power of an optical instrument depends on:
  1. A
    The focal length of the lens
  2. B
    The wavelength of light used
  3. C
    The intensity of light
  4. D
    The magnification power
Question 6Single Answer
Polarization of light can be achieved by:
  1. A
    Reflection
  2. B
    Absorption
  3. C
    Amplification
  4. D
    Emission
Question 7Single Answer
Malus’s law relates the intensity of polarized light to:
  1. A
    The angle of incidence
  2. B
    The angle between polarizer and analyzer
  3. C
    The wavelength of light
  4. D
    The refractive index
Question 8Single Answer
What is the principle behind the working of a laser?
  1. A
    Spontaneous emission
  2. B
    Stimulated emission
  3. C
    Absorption
  4. D
    Diffraction
Question 9Single Answer
Which type of laser is commonly used in barcode scanners?
  1. A
    Ruby laser
  2. B
    He-Ne laser
  3. C
    Semiconductor laser
  4. D
    CO2 laser
Question 10Single Answer
The principle of total internal reflection is used in:
  1. A
    Microscopes
  2. B
    Telescopes
  3. C
    Optical fibers
  4. D
    Cameras
Question 11Single Answer
Which optical phenomenon is responsible for the formation of Newton’s rings?
  1. A
    Diffraction
  2. B
    Interference
  3. C
    Polarization
  4. D
    Refraction
Question 12Single Answer
The critical angle in total internal reflection depends on:
  1. A
    Wavelength of light
  2. B
    Refractive indices of the two media
  3. C
    Intensity of light
  4. D
    Polarization state
Question 13Single Answer
The phenomenon of diffraction is more pronounced when the aperture size is:
  1. A
    Much larger than the wavelength
  2. B
    Much smaller than the wavelength
  3. C
    Comparable to the wavelength
  4. D
    Equal to the wavelength
Question 14Single Answer
In a diffraction grating, the number of lines per unit length determines:
  1. A
    Intensity
  2. B
    Resolving power
  3. C
    Magnification
  4. D
    Focal length
Question 15Single Answer
Which of the following is NOT a method of polarization?
  1. A
    Reflection
  2. B
    Scattering
  3. C
    Diffraction
  4. D
    Double refraction
Question 16Single Answer
The main advantage of optical fibers in communication is:
  1. A
    High cost
  2. B
    Low bandwidth
  3. C
    Low signal loss
  4. D
    Heavy weight
Question 17Single Answer
What is the primary cause of chromatic aberration in lenses?
  1. A
    Variation in focal length with wavelength
  2. B
    Variation in intensity with wavelength
  3. C
    Variation in amplitude with wavelength
  4. D
    Variation in phase with wavelength
Question 18Single Answer
The interference pattern in Young’s experiment is observed due to:
  1. A
    Superposition of waves
  2. B
    Reflection of waves
  3. C
    Refraction of waves
  4. D
    Polarization of waves
Question 19Single Answer
What is the role of population inversion in a laser?
  1. A
    To absorb light
  2. B
    To emit light spontaneously
  3. C
    To enable stimulated emission
  4. D
    To diffract light
Question 20Single Answer
Which of the following optical instruments uses a convex lens as an objective?
  1. A
    Simple microscope
  2. B
    Telescope
  3. C
    Camera
  4. D
    Projector
Question 21Single Answer
The anti-reflection coating on lenses works based on:
  1. A
    Diffraction
  2. B
    Interference
  3. C
    Polarization
  4. D
    Refraction
Question 22Single Answer
The resolving power of a telescope increases with:
  1. A
    Larger aperture
  2. B
    Smaller aperture
  3. C
    Longer focal length
  4. D
    Smaller wavelength
Question 23Single Answer
Which property of light is used in LCD displays?
  1. A
    Diffraction
  2. B
    Polarization
  3. C
    Interference
  4. D
    Refraction
Question 24Single Answer
In fiber optics, attenuation refers to:
  1. A
    Increase in signal strength
  2. B
    Loss of signal strength
  3. C
    Change in signal frequency
  4. D
    Change in signal phase
Question 25Single Answer
Which type of optical fiber is used for long-distance communication?
  1. A
    Multi-mode fiber
  2. B
    Single-mode fiber
  3. C
    Graded-index fiber
  4. D
    Plastic fiber
Question 26Single Answer
The energy gap in a semiconductor is typically in the range of:
  1. A
    0.1–2 eV
  2. B
    5–10 eV
  3. C
    10–20 eV
  4. D
    0.01–0.1 eV
Question 27Single Answer
What is the primary charge carrier in an n-type semiconductor?
  1. A
    Holes
  2. B
    Electrons
  3. C
    Ions
  4. D
    Protons
Question 28Single Answer
The Hall Effect is used to determine:
  1. A
    Resistivity of a material
  2. B
    Carrier concentration and type
  3. C
    Band gap energy
  4. D
    Mobility of charge carriers
Question 29Single Answer
In a p-n junction diode under forward bias, the current is primarily due to:
  1. A
    Drift of minority carriers
  2. B
    Diffusion of majority carriers
  3. C
    Drift of majority carriers
  4. D
    Diffusion of minority carriers
Question 30Single Answer
The V-I characteristic of a Zener diode shows:
  1. A
    Constant current
  2. B
    Constant voltage in reverse bias
  3. C
    Linear behavior
  4. D
    Exponential behavior
Question 31Single Answer
Which semiconductor device is used in solar cells?
  1. A
    LED
  2. B
    Photodiode
  3. C
    Zener diode
  4. D
    p-n junction diode
Question 32Single Answer
The conductivity of an intrinsic semiconductor increases with:
  1. A
    Decrease in temperature
  2. B
    Increase in temperature
  3. C
    Increase in doping
  4. D
    Decrease in band gap
Question 33Single Answer
The main function of a transistor is:
  1. A
    Rectification
  2. B
    Amplification
  3. C
    Voltage regulation
  4. D
    Signal modulation
Question 34Single Answer
In a BJT, the emitter is doped:
  1. A
    Lightly
  2. B
    Moderately
  3. C
    Heavily
  4. D
    Not doped
Question 35Single Answer
Which of the following is a unipolar device?
  1. A
    BJT
  2. B
    FET
  3. C
    Zener diode
  4. D
    SCR
Question 36Single Answer
The forbidden energy gap in silicon is approximately:
  1. A
    0.7 eV
  2. B
    1.1 eV
  3. C
    1.5 eV
  4. D
    2.0 eV
Question 37Single Answer
The primary function of a photodiode is to:
  1. A
    Emit light
  2. B
    Detect light
  3. C
    Amplify signals
  4. D
    Store charge
Question 38Single Answer
In a p-type semiconductor, the majority carriers are:
  1. A
    Electrons
  2. B
    Holes
  3. C
    Ions
  4. D
    Neutrons
Question 39Single Answer
The drift current in a semiconductor is due to:
  1. A
    Thermal motion of carriers
  2. B
    Electric field
  3. C
    Diffusion of carriers
  4. D
    Magnetic field
Question 40Single Answer
Which material is commonly used as a semiconductor?
  1. A
    Copper
  2. B
    Silicon
  3. C
    Aluminum
  4. D
    Iron
Question 41Single Answer
The breakdown voltage of a Zener diode is determined by:
  1. A
    Doping concentration
  2. B
    Temperature
  3. C
    Current flow
  4. D
    Resistance
Question 42Single Answer
The main advantage of a MOSFET over a BJT is:
  1. A
    Lower power consumption
  2. B
    Higher current gain
  3. C
    Lower voltage gain
  4. D
    Larger size
Question 43Single Answer
The depletion region in a p-n junction is formed due to:
  1. A
    Recombination of carriers
  2. B
    Diffusion of carriers
  3. C
    Drift of carriers
  4. D
    Ionization of atoms
Question 44Single Answer
Which device is used for voltage regulation?
  1. A
    LED
  2. B
    Zener diode
  3. C
    Photodiode
  4. D
    Transistor
Question 45Single Answer
The mobility of charge carriers in a semiconductor depends on:
  1. A
    Temperature
  2. B
    Band gap
  3. C
    Doping level
  4. D
    Wavelength
Question 46Single Answer
The output of a half-wave rectifier is:
  1. A
    Pure DC
  2. B
    Pulsating DC
  3. C
    AC
  4. D
    Zero
Question 47Single Answer
Which of the following is NOT a property of a semiconductor?
  1. A
    Variable conductivity
  2. B
    Fixed band gap
  3. C
    Doping capability
  4. D
    Temperature sensitivity
Question 48Single Answer
The efficiency of a solar cell depends on:
  1. A
    Wavelength of incident light
  2. B
    Temperature
  3. C
    Material properties
  4. D
    All of the above
Question 49Single Answer
In an n-p-n transistor, the collector current is controlled by:
  1. A
    Base current
  2. B
    Emitter current
  3. C
    Collector voltage
  4. D
    Base voltage
Question 50Single Answer
The primary application of a photodiode in environmental monitoring is:
  1. A
    Temperature sensing
  2. B
    Light detection
  3. C
    Pressure sensing
  4. D
    Humidity sensing
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