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Physics Mock Test - 3
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  • Question 1/50
    5 / -1
    Which one of the following law is based on the principle of conservation of electric charge?
  • Question 2/50
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    Find the equivalent internal resistance and potential of the given circuit.

  • Question 3/50
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    In an observation with a telescope, having aperture of lens D, if the wavelength of the light is tripled then the resolving power of telescope will-
  • Question 4/50
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    The power loss in a conductor of resistance 'R' across which a potential difference of 'V' is equal to which of the following?
  • Question 5/50
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    In an experiment of a single slit diffraction, the distance between the screen and the slit is increased by 5 cm. Then the angular width will -
  • Question 6/50
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    The phenomenon which produces colours in a soap bubble is due to:
  • Question 7/50
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    Find the potential difference across the resistance R2 in the given circuit (Given R1 = 15 ohm, R2­ = 15 ohm, R3 = 30 ohm and R4 = 35 ohm)

  • Question 8/50
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    The refractive index of a thin prism of prism angle 5° is 1.4. Find the angle of deviation of light ray falling on this prism.
  • Question 9/50
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    Calculate the half life of a substance X, having decay rate constant of 2.31 × 10-2
  • Question 10/50
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    The frequency employed for TV broadcasting is normally of the order of - 
  • Question 11/50
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    An atom has a mass number of 23 and atomic number 11. The number of protons is ________.
  • Question 12/50
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    Which one of the following statements is NOT true about the sound waves?
  • Question 13/50
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    The focal length of a mirror is f. If it is placed in water (n = 4/3), its focal length will be:
  • Question 14/50
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    When a dielectric material of K dielectric constant is inserted between two parallel plate capacitor the electric field in between region of the plates 
  • Question 15/50
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    Two current-carrying long wires of equal length are placed parallel to each other and separated by a small distance, if the current in both the wires is halved then the force per unit length on the wires will:
  • Question 16/50
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    Identify the logic operation performed by the circuit given here.

  • Question 17/50
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    Light with longest wave length in visible spectrum is _____?
  • Question 18/50
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    The forbidden energy band gap in conductors, semiconductors and insulators are Eg1, Eg2 and Eg3 respectively. The relation among them is
  • Question 19/50
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    Input characteristics of transistor in CE mode represents resistance that is of value:
  • Question 20/50
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    Find the angle of dip at a certain place where the horizontal and vertical components of the earth’s magnetic fields are same.
  • Question 21/50
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    An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:
  • Question 22/50
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    De Broglie relation is represented by ______.
  • Question 23/50
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    An electric dipole of dipole moment p is placed parallel to a uniform electric field E. The work done required to rotate the dipole by an angle 180° will be:
  • Question 24/50
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    Which of the following statements is true with reference to Coulomb's law?
  • Question 25/50
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    The torque experienced by a magnetic dipole, having dipole moment M, when placed in a uniform magnetic field of intensity B is:
  • Question 26/50
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    In the circuit shown below 18 V Zener diode has zero Zener resistance and a knee current of 2 mA. The minimum value of R so that voltage across it does not fall below 18 V is:

  • Question 27/50
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    A charged conductor is placed in an external electric field. The potential inside the conductor is

  • Question 28/50
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    Write the frequency of EM waves spectrum in increasing order.
  • Question 29/50
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    According to Gauss’s law, the electric field due to an infinitely long thin charged wire varies as:
  • Question 30/50
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    The semiconductor used for the fabrication of visible LEDs must at least have a band gap of:
  • Question 31/50
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    If the last band on the carbon resistor is absent, then the tolerance is
  • Question 32/50
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    In a Van de Graaff Generator the inner sphere has higher _____________ than the outer sphere.
  • Question 33/50
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    When a diode is reverse biased then the barrier height ____________________________.
  • Question 34/50
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    In the circuit, the equivalent resistance between A and B is (Each resistance given in the diagram is R) :

  • Question 35/50
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    Which of these v-I plots, is ohmic - 
  • Question 36/50
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    The type of mirror used in the head lamps of cars is the:-
  • Question 37/50
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    In Oersted's experiment, which type of electric source is used?
  • Question 38/50
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    Excitation energy of a hydrogen like ion in its first excitation state is 40.8 eV. Energy needed to remove the electron from the ion ground state is _____
  • Question 39/50
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    A charge particle of charge q is placed at a point. Find the magnitude of electric field at a distance of 1 m from the charge particle if the space is filled with a dielectric of dielectric constant 1.5. 
  • Question 40/50
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    Two charges +q  and -q each of magnitude 6.0 × 10-6 C forms a dipole. The separation between the charges is 4 × 10-10 m. If this dipole is placed in a uniform electric field E = 3.0 × 102 NC-1 at an angle of 30° with the field then calculate the value of torque on the dipole?
  • Question 41/50
    5 / -1
    If the intensity and frequency of incident light is doubled then :
  • Question 42/50
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    Which decay process does  \({_zX^A} \longrightarrow {_{z-1}Y^A} + {_{1}e^0} + {\nu}\) represents
  • Question 43/50
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    How much magnification can be obtained at near point 25 cm by using a convex lens of focal length 10 cm?
  • Question 44/50
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    If the radius of the potentiometer wire is doubled then effect on null point
  • Question 45/50
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    How eddy current can be produced in a bulk piece of conducting material?
  • Question 46/50
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    Which of the following modes is used for propagation of very high frequencies?
  • Question 47/50
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    Refer to the following diagram to calculate how far (in cm) will the image be formed from the mirror. AB is the object.

  • Question 48/50
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    A DC voltmeter is capable of measuring a maximum of 300 volts. If it is used to measure the voltage across a device operating at 220 volt AC supply, the reading of the voltmeter will be
  • Question 49/50
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    Vinod is running in front of a plane mirror with speed 4 m /s. By what speed Vinod is being approached by his image?
  • Question 50/50
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    Alternating current cannot be measured by DC ammeter because:
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