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    Home MCQ examination Jamb Physics 2011

    Physics 2011 Jamb Examination

    Physics 2011 Jamb Examination
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    1...345

    Question 41

    A copper wire was subjected to a tensile stress of 7.7 × 107 N m-2. Calculate the strain of the wire.
    [Young's modulus = 1.1 × 1011 N m-2]
    Show explanation Expand Question
    C. 7.0 × 10-4 — strain = stress / Young’s modulus = (7.7 × 107) / (1.1 × 1011) = 7.0 × 10-4.
    Not clear enough?

    Question 42

    I. High thermal capacity.
    II. High sensitivity.
    III. Easy readability.
    IV. Accuracy over a wide range of temperature.

    From the statement above, the qualities of a good thermometer are
    Show explanation Expand Question
    D. II, III and IV — a good thermometer should have high sensitivity, easy readability, and accuracy over a wide temperature range.
    Not clear enough?

    Question 43

    Two balls X and Y weighing 5 g and 50 kg respectively were thrown up vertically at the same time with a velocity of 100 m s-1. How will their positions be one second later?
    Show explanation Expand Question
    D. X and Y both be 500 m from the point of throw — gravitational acceleration is the same for all masses, so both move identically.
    Not clear enough?

    Question 44

    If it takes an object 3 s to fall freely to the ground from a certain height, what is the distance covered by the object?
    Show explanation Expand Question
    C. 45 m — distance = ½gt² = ½ × 10 × 3² = 45 m.
    Not clear enough?

    Question 45

    An object of mass 2 kg moves with a velocity of 10 m s-1 round a circle of radius 4 m. Calculate the centripetal force on the object.
    Show explanation Expand Question
    C. 50 N — F = mv²/r = (2 × 10²) / 4 = 50 N.
    Not clear enough?

    Question 46

    A carpenter on top of a roof of 20.0 m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. The kinetic energy of the hammer just before hitting the ground is?
    [g = 10 m s-2]
    Show explanation Expand Question
    C. 300 J — K.E = mgh = 1.5 × 10 × 20 = 300 J.
    Not clear enough?

    Question 47

    If a tube of small radius opened at both ends is placed in a liquid, the liquid will
    Show explanation Expand Question
    C. Falls below the liquid level if the liquid does not wet the glass — non-wetting liquids (like mercury) experience capillary depression.
    Not clear enough?

    Question 48

    A man standing on a lift that is descending does not feel any weight because
    Show explanation Expand Question
    C. There is no reaction from the floor of the lift — the lift and man are in free fall, so normal reaction is zero.
    Not clear enough?

    Question 49

    A block of aluminum is heated electrically by a 25 W heater. If the temperature rises by 10 °C in 5 minutes, the heat capacity of the aluminum is?
    Show explanation Expand Question
    B. 750 J K-1 — heat supplied = 25 × 5 × 60 = 7500 J; heat capacity = 7500 / 10 = 750 J K-1.
    Not clear enough?
    1...345

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