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Physics Test - ...

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  • Question 1
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    An AND gate has four inputs A, B, C, D. The input that produces an output 1 is

  • Question 2
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    Forces of magnitudes 3 and 2 units acting in the direction  respectively act on a particle which is displaced from the points (1,-1,-1) to (3,3,1) . The work done by the forces is equal to

  • Question 3
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    The net work done by a net force acting on an object is equal to the change in the kinetic energy of the object. It is known as:

  • Question 4
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    For a transistor, the current amplification factor is 0.8. If the transistor is in common emitter configuration and the base current changes by 6 mA, the change in the collector current is

  • Question 5
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    A boatman can row with a speed of 10 kmh–1. If a river of width 2 km flows at 5 kmh–1, then what is the direction in which the boatman should row to reach a point on the other bank directly opposite to the point from where he started?

  • Question 6
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    A rod, 1 m long, made of a material of thermal conductivity 420 W/m/K has one of its ends in melting ice and the other end in boiling water. If its cross-sectional area is 10 cm2, then the amount of ice that melts in 1 minute is

  • Question 7
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    The condition for a uniform spherical mass 'm' of radius 'r', to be a black hole is ______________.

    [G = gravitational constant and g = acceleration due to gravity]

  • Question 8
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    In the following question, a statement of Assertion is given, followed by a corresponding statement of Reason. Mark the correct answer as:

    (a)  If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

    (b)   If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.

    (c)   If Assertion is true, but Reason is false.

    (d)   If both Assertion and Reason are false.

    Assertion: The earth is slowing down and as a result the moon is coming nearer to it.

    Reason: The angular momentum of the earth-moon system is not conserved.

  • Question 9
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    A body moving along the circular path of radius `R` describes an angle of 60o at the center of the circle, while moving from A to B. The displacement of the body is

  • Question 10
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    Three rods made of the same material and having the same cross-section have been joined as shown in the figure below. Each rod is of the same length. The left and right ends are kept at 0oC and 90oC, respectively. The temperature of the junction of the three rods will be

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