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Physics Test - 3

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Physics Test - 3
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Dimensions of torque is:

    Solution

    Torque is a physical computation with the dimension of force times distance. Its SI unit is a newton meter. It also has a unit as joule per radian.

    We know that,

     

  • Question 2
    4 / -1

    A van moving at 40 km/h is to be stopped by applying brakes in the next 4 m. If the van weighs 2000 kg, what is the average force to be applied to stop it?

    Solution

     

  • Question 3
    4 / -1

    The phase difference between the electric field and the magnetic field in the electromagnetic wave is:

    Solution

    The phase difference between the electric field and the magnetic field in the electromagnetic wave is zero.

    • The electric field and the magnetic field components of an electromagnetic wave oscillate in such a way that they have their peak at the same time and also become zero at the same time.
    • Since there is no time difference between the peaks of the electric and the magnetic field, so the phase difference between the electric and the magnetic field of the electromagnetic wave is zero.

     

  • Question 4
    4 / -1

    _________ developed the corpuscular theory of light.

    Solution

    The corpuscular theory was largely developed by Sir Isaac Newton.

    It stated that light is made up of small discrete particles called corpuscles which travel in a straight line with a finite velocity and possess impetus.

    Newton’s corpuscular theory is based on the following points:

    • Light consists of very thin particles called corpuscles.
    • These corpuscles after emission travel in a straight line and at a very high velocity.
    • When these particles enter the eyes they cause a sensation of vision.
    • Corpuscles of different colors have different sizes.

     

  • Question 5
    4 / -1

    If λ is the wavelength of a hydrogen atom from the transition n = 3 to n = 1 , then what is the wavelength for doubly ionized lithium-ion for the same transition?

    Solution

     

  • Question 6
    4 / -1

    The flow rate from a tap of diameter 1.25 cm is 3 lit / min . The coefficient of viscosity of water is 10−3 Pas. The nature of flow is:

    Solution

     

  • Question 7
    4 / -1

    In a series resonant circuit, the AC voltage across resistance R , inductor L and capacitor C , are 5 V, 10 V and 10 V respectively. The AC voltage applied to the circuit will be:

    Solution

     

  • Question 8
    4 / -1

    The built-in-potential profile in the depletion region of a p-n junction in equilibrium is shown in the figure. The depletion region width is 1 μm.

    Which of the following statements is/are true?

    Solution

    The charge, electric field, and potential profile for the given potential function following passion’s Equation will be,

    As seen from the charge, electric field and electric potential profile,

    The volume charge in the left side of the junction is negative which is due to ionized acceptor atoms Na– and the right side of the junction is positive which is due to the ionized donar atoms N+d

    So, the left side is p-type and the right side is n-type.

    Now, the maximum electric field field is given as:

    Since, the potential distribution is equal in both the sides, the two sides are equally doped.

     

  • Question 9
    4 / -1

    An electron and a proton are allowed to fall through the separation between the plates of a parallel plate capacitor of voltage 5 V and separation distance h = 1 mm . Calculate the time of flight for both electron and proton:

    Solution


     

  • Question 10
    4 / -1

    A light bulb and an open coil induction are connected in series to an ac source as shown in figure. Now an iron rod is inserted into the interior of the inductor. The glow of the light bulb will be:

    Solution

    A light bulb and an open coil induction are connected in series to an ac source as shown in figure. Now an iron rod is inserted into the interior of the inductor. The glow of the light bulb will be decreases.

    When an iron rod is inserted into the interior of the inductor then inductance (L) of the coil increases. Here due to the iron rod, the inductance (XL) of the coil increases.

    If the inductance increase then the current will decrease and the bulb will glow less brightly.

     

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