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Meghalaya Police Service Preliminary Examination 2022 - Multiple Subjects — question paper

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Meghalaya Police Service Preliminary Examination 2022 - Multiple Subjects

Paper #3169 · 17-12-2022 · Multiple subjects · 514 reviewed questions · Showing 481–514 of 514

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Accuracy note: This is a reviewed structured rendering of an official previous-year paper and may cover only part of it. Where available, explanatory notes describe unresolved source or answer issues without supplying a scoring answer. Official examination authority notices remain final.

  1. Two tuning forks of frequency 350 Hz and 354 Hz are sounded together. The possible number of beats per second will be
    1. 350
    2. 354
    3. 2
    4. 4
  2. The minimum distance of separation between two consecutive nodes in a stationary wave is approximately equal to
    1. Half of the wavelength
    2. Wavelength
    3. One fourth of wavelength
    4. Double the wavelength
  3. A string of length 40 cm fixed at both it’s ends is vibrating in two segments. What is the corresponding wavelength of the wave?
    1. 80 cm
    2. 60 cm
    3. 40 cm
    4. 20 cm
  4. An observer moves towards a stationary source of frequency 330 Hz with a speed of 40 m/s. Given the speed of sound in air to be 330 m/s, what will be the approximate value of the apparent frequency (in Hertz) heard by the observer?
    1. 330
    2. 350
    3. 370
    4. 390
  5. Two photons recede from each other in opposite direction. If the speed of light in space is c, the relative velocity of the photons with respect to one another is
    1. 2c
    2. 0
    3. 1.5c
    4. c
  6. Which of the following frequencies fall in the range of ultrasonic waves?
    1. 20 Hz
    2. 200 Hz
    3. 15 KHz
    4. 25 KHz
  7. The electric charge associated to an α particle is approximately equal to
    1. 1.2 × 10⁻¹⁹ C
    2. 1.6 × 10⁻¹⁹ C
    3. 3.2 × 10⁻¹⁹ C
    4. 4.8 × 10⁻¹⁹ C
  8. The total electric charge in an isolated system remains constant. This principle is based on
    1. Law of conservation of charge
    2. Quantization of charge
    3. Law of conservation of energy
    4. Coulomb’s law
  9. The electrostatic force between two charges Q₁ and Q₂ at a certain distance apart is given to be F. If the magnitude of both the charges are doubled and the distance of separation is reduced to half it’s value, what will be the magnitude of the force now?
    1. 2F
    2. 4F
    3. 8F
    4. 16F
  10. The magnitude of the electric field (E) due to a point charge at a point is proportional to it’s distance from the point charge (r) in the following way
    1. E ∝ r
    2. E ∝ r⁻¹
    3. E ∝ r⁻²
    4. E ∝ r²
  11. A proton is placed in a uniform electric field of magnitude 0.2 NC⁻¹. The force acting on the proton is
    1. 3.2 × 10⁻²⁰ N
    2. 3.2 × 10⁻¹⁹ N
    3. 1.6 × 10⁻¹⁹ N
    4. 1.6 × 10⁻²⁰ N
  12. An electron and a proton are placed inside a unit cube in free space. If ε₀ represent the permittivity of free space, then the total electric flux passing out of the unit cube in SI unit is
    1. 3.2 × 10⁻¹⁹/ε₀
    2. Zero
    3. 1.6 × 10⁻¹⁹/ε₀
    4. 3.2 × 10⁻¹⁹ ε₀
  13. Which of the following is the SI unit of electric flux?
    1. CN⁻¹m⁻²
    2. C²N⁻¹m⁻²
    3. Nm²C⁻¹
    4. C²N⁻¹m²
  14. Two charges of magnitude +2 μC and +3 μC are kept at a distance of 5 cm apart in air. The ratio of the magnitude of Coulomb’s forces acting on the respective charges is
    1. 2 : 3
    2. 3 : 2
    3. 4 : 9
    4. 1 : 1
  15. A proton, a deuteron and an α particle (at rest) are accelerated through the same electro-static potential. The corresponding kinetic energies attained will be in the ratio of
    1. 1 : 1 : 1
    2. 1 : 1 : 2
    3. 1 : 2 : 2
    4. 2 : 2 : 1
  16. A wire of uniform cross section having resistance of 12 ohm is kept in the form of a circle. The resistance across two of it’s diametrically opposite ends is equal to
    1. 24 ohm
    2. 12 ohm
    3. 6 ohm
    4. 3 ohm
  17. Non existence of a magnetic monopole is closely related to
    1. Coulomb’s Law
    2. Gauss’s law in magnetism
    3. Gauss’s law in electrostatic
    4. Kirchhoff’s current law
  18. Bohr magneton is approximately equal to
    1. 9.27 × 10⁻³⁰ J-T⁻¹
    2. 9.27 × 10⁻²⁸ J-T⁻¹
    3. 9.27 × 10⁻²⁶ J-T⁻¹
    4. 9.27 × 10⁻²⁴ J-T⁻¹
  19. The relative permeability of a magnetic material is given to be 0.99. The material will essentially be
    1. Ferromagnetic
    2. Diamagnetic
    3. Paramagnetic
    4. Either paramagnetic or ferromagnetic
  20. Which of the following is the SI unit of magnetic susceptibility?
    1. J-T⁻¹
    2. AJ-T⁻¹
    3. Am⁻¹
    4. No unit
  21. A charged particle enters a region of uniform magnetic field at right angles to it. The nature of it’s possible trajectory will be
    1. Straight line
    2. Circular
    3. Parabolic
    4. Hyperbolic
  22. Which of the following particles cannot be energized directly by using a cyclotron?
    1. Protons
    2. Alpha particles
    3. Neutrons
    4. Positive ions
  23. The angular frequency of a cyclotron does not depend on the
    1. Magnetic field applied
    2. Mass of the particle
    3. Charge of the particle
    4. Speed of the particle
  24. An α particle with a kinetic energy E enters into a region of a uniform magnetic field at right angle to it. The kinetic energy of the particle after a time T (time period) becomes
    1. 2E
    2. Less than E
    3. E/2
    4. E
  25. Hall coefficient of a given material M is found to be zero. The most probable type of material among the following in which M could belong is
    1. Insulator
    2. P type semiconductor
    3. N type semiconductor
    4. Extrinsic semiconductors
  26. Which of the following can be used for producing high voltage through electrostatic process?
    1. Van de Graaff accelerator
    2. Electroscope
    3. Ammeter
    4. Capacitor
  27. Three identical capacitors of 6 μF each are connected in series. What is the equivalent capacitance?
    1. 18 μF
    2. 6 μF
    3. 3 μF
    4. 2 μF
  28. Which of the following can be used as dielectrics?
    1. Copper
    2. Silver
    3. Mica
    4. Aluminium
  29. What is the dielectric constant of a metal?
    1. Zero
    2. 1
    3. Between zero and one
    4. Infinity
  30. Two identical resistances are first connected in series and then in parallel. The effective resistances are in the ratio
    1. 1 : 1
    2. 1 : 2
    3. 4 : 1
    4. 1 : 4
  31. Kirchhoff’s first law in an electric circuit essentially deals with the algebraic sum of
    1. Current at a node
    2. Voltage in a closed loop
    3. Emfs of the sources
    4. Drift velocities through the conductors
  32. The magnetic field (in tesla) produced at the centre of a circular coil of radius r having N turns and carrying a current of i is
    1. 2μ₀πNir
    2. μ₀Ni/2r
    3. μ₀πNi/2r
    4. 2πNi/r²
  33. The magnetic field at a distance of r from an infinitely long wire carrying a current i is
    1. μ₀i/2πr
    2. μ₀i/4πr
    3. μ₀i/πr
    4. μ₀i/πr²
  34. Faraday’s law of e m induction is related to a closed loop with the following:
    1. Rate of electric flux change
    2. Rate of magnetic flux change
    3. Rate of electric dipole moment change
    4. Rate of electric polarization change

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