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Physics Test 24...

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  • Question 1
    4 / -1

    The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to  of its initial value?

  • Question 2
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    In a u-tube as shown in the fig. water and oil are in the left side and right side of the tube respectively. The heights from the bottom for water and oil columns are 15 cm and 20 cm respectively. The density of the oil is [take ρwater = 1000 kg/m3]

  • Question 3
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    Two small spherical metal balls, having equal masses, are made from materials of densities ρ1 and ρ2 (ρ1 = 8ρ2) and have radii of 1 mm and 2 mm, respectively, They are made to fall vertically (from rest) in a viscous medium whose coefficient of viscosity equals η and whose density is 0.1 ρ2. The ratio of their terminal velocities would be,

  • Question 4
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    Two identical capacitors C1 and C2 of equal capacitance are connected as shown in the circuit. Terminals a and b of the key k are connected to charge capacitor C1 using battery of emf V volt. Now disconnecting a and b the terminals b and c are connected. Due to this, what will be the percentage loss of energy ?

  • Question 5
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    Choose the correct answer from the options given below:

  • Question 6
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    Given below are two statements :

    Statement I :

    Biot-Savart's law gives us the expression for the magnetic field strength of an infinitesimal current element (IdI) of a current carrying conductor only.

    Statement II :

    Biot-Savart's law is analogous to Coulomb's inverse square law of charge q, with the former being related to the field produced by a scalar source, Idl while the latter being produced by a vector source, q.

    In light of above statements choose the most appropriate answer from the options given below:

  • Question 7
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  • Question 8
    4 / -1

    For a radioactive material, half life is 10 minutes. If initially there are 600 number of nuclei, the time taken in minutes for the disintegration of 450 nuclei is

  • Question 9
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  • Question 10
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    When the light of frequency 2v0 (where v0 is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v1. When the frequency of the incident radiation is increased to 5v0, the maximum velocity of electrons emitted from the same plate is v2. The ratio of v1 to v2 is

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