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Physics Test 238

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Physics Test 238
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Weekly Quiz Competition
  • Question 1
    4 / -1

    The distance between the centres of the Moon and the earth is D. The mass of the earth is 81 times the mass of the Moon. At what distance from the centre of the earth, the gravitational force will be zero?

    Solution

    let, at a distance x from the earth, the net gravitational force will be zero.

     

  • Question 2
    4 / -1

    Imagine a light planet revolving around a very massive star in a circular orbit of radius r with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to r5/2, then the square of the time period will be proportional to.

    Solution

     

  • Question 3
    4 / -1

    The ratio of the weight of a man in a stationary lift & when it is moving downward with uniform acceleration 'a' is 3 : 2. The value of 'a' is (g = acceleration due to gravity)

    Solution

     

  • Question 4
    4 / -1

    Starting from rest, a body slides down a 45 inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is

    Solution


     

     

  • Question 5
    4 / -1

    Two metal wire 'P' and 'Q' of same length and material are stretched by same load. Their masses are in the ratio m1 : m2. The ratio of elongations of wire 'P' to that of 'Q' is

    Solution

     

  • Question 6
    4 / -1

    Two bodies of equal masses revolve in circular orbits of radii R1 and R2 with the sample period. Their centripetal forces are in the ratio.

    Solution

    We can say that the centripetal force is inversely proportional to the radius of the orbit.

     

  • Question 7
    4 / -1

    A straight wire carrying a current i1 amp runs along the axis of a circular current i2 amp. Then the force of interaction between the two current carrying conductors is?

    Solution

    As shown in the figure straight wire is placed parallel to the magnetic field produced by circular current. Hence force on wire F = 0

     

  • Question 8
    4 / -1

    A and B are two conductors carrying a current i in the same direction, x and y are two electron beams moving in the same direction. There will be :

    Solution

    Calculation:

    The force between two parallel current-carrying conductors is given as,

    Since, the current-carrying conductors will attract each other, while electron beams will repel each other.

    Thus, the force is attraction between A and B, is repulsion between x and y.

     

  • Question 9
    4 / -1

    The radioactivity of a given sample of whisky due to tritium (half life 12.3 years) was found to be only 3% of that measured in a recently purchased bottle marked "7 years old". The sample must have been prepared about

    Solution

    After one half life period, the activity of Tritium becomes 50%

    ,

    After 2 half life period 25%

    ,

    After 3 half life period 12.5%

    ,

    After 4 half life period 6.25%

    ,

    After 5 half life period 3.12% ≈ 3%

    ,

    It is 5×12.5 years + 7 years i.e. approximately 70 years only.

     

  • Question 10
    4 / -1

    A particle which is constrained to move along the x-axis, is subjected to a force in the same direction which varies with the distance x of the particle from the origin as F(x) = −kx + ax3. Here k and a are positive constants. For x ≥ 0, the functional form of the potential energy U(x) of the particle is

    Solution

     

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