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Physics Test 23...

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  • 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?

  • 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.

  • 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)

  • 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

  • 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

  • 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.

  • 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?

  • 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 :

  • 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

  • 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

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