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Physics Test 20...

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  • Question 1
    4 / -1

    Materials suitable for making electromagnets should have

  • Question 2
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    A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric of dielectric constant 2.2 between them. When the electric field in the dielectric is 3 × 104 V/m, the charge density of the positive plate will be close to

  • Question 3
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    A circular loop of radius 0.3 cm lies parallel to a much bigger circular loop of radius 20 cm. The centre of the small loop is on the axis of the bigger loop. The distance between their centres is 15 cm. If a current of 2.0 A flows through the smaller loop, then the flux linked with bigger loop is

  • Question 4
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    A thin wire of length L and mass M is bent to form a semicircle. What is the magnitude of gravitational field at the centre?

  • Question 5
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    Two cars of masses m1 and m2 are moving in circles of radii r1 and r2, respectively. Their speeds are such that they make complete circles in the same time t. The ratio of their centripetal acceleration is

  • Question 6
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    Assume that a drop of liquid evaporates by decrease in its surface energy, so that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? (The surface tension is T, density of liquid is ρ and L is its latent heat of vaporisation)

  • Question 7
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    A wooden wheel of radius R is made of two semicircular parts (see figure).

    The two parts are held together by a ring made of a metal strip of cross-sectional area S and length L. L is slightly less than 2πR. To fit the ring on the wheel, it is heated so that its temperature rises by ΔT and it just steps over the wheel. As it cools down to surrounding temperature, it presses the semi-circular parts together. If the coefficient of linear expansion of the metal is ∝ and its Young's modulus is Y, the force that one part of the wheel applies on the other part is

  • Question 8
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    A shell at rest explodes. The centre of mass of the fragments

  • Question 9
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    Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is

  • Question 10
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    Directions For Questions

    Directions: This question has Statement 1 and Statement 2. Of the four choices given after the statements, choose the one that best describes the two statements

    ...view full instructions

    If two springs S1 and S2 of force constants k1 and k2, respectively, are stretched by the same force, then it is found that more work is done on spring S1 than on spring S2.

    Statement 1: If stretched by the same amount, work done on S1 will be more than that on S2.

    Statement 2: k1 < k2

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