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JAMB - Physics (1982)

  • 1
    The hatch door of a submarine has an area of 0.5m2. The specific gravity of sea water is 1.03. Assume that g = 10ms-1,and neglect the atmospheric pressure. The force exerted by the sea water on the hatch door at a depth of 200m is
    Atsakymas
    (E)
    1.03 x 103N
  • 2
    A man stands on a spring scale placed in a lift. The lift descends at constant velocity. As a result, the scale reads a weight
    Atsakymas
    (B)
    the same as the weight of the man
  • 3
    One of the following readings represents the measurement of the length of a metal rod using vernier callipers, Taking the reading accuracy into consideration, the most likely one is
    Atsakymas
    (A)
    5.15cm
  • 4
    When equal weights of iron and water are subjected to equal supply of heat, it is found that the piece of iron become more hotter than water after a short time because
    Atsakymas
    (D)
    the specific heat of water is higher than that of iron
  • 5
    The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres to 57°C. The tyre pressure had by the afternoon was?
    Atsakymas
    (A)
    increased by 15.0cm Hg
  • 6
    The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400ms-1, the depth of the ocean is
    Atsakymas
    (A)
    1,750m
  • 7
    An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is
    Atsakymas
    (D)
    4.0A, 62.5\(\Omega\)
  • 8
    The force responsible for holding the moon in its orbit around the earth against the gravitational pull of the earth is
    Atsakymas
    (D)
    centripetal
  • 9
    A mango fruit drops from a branch 10m above the ground, just before hitting the ground its velocity is (g = 10ms-2)
    Atsakymas
    (A)
    10√2ms-1
  • 10
    Which of the following machines does NOT apply the lever principle?
    Atsakymas
    (C)
    single moving pulley
  • 11
    The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a
    Atsakymas
    (E)
    bottle
  • 12
    Which of the following statements is NOT true? Thermostats are used to control the temperature of
    Atsakymas
    (A)
    pressure cookers
  • 13
    250g of lead at 170oC is dropped into 100g of water at 0oC. If the final temperature is 12oC, the specific heat of lead is (specific heat of water is 4,200J/kgoC)
    Atsakymas
    (C)
    127.6J/kgoC
  • 14
    An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is
    Atsakymas
    (A)
    20cm
  • 15
    The combination of sound waves with different frequencies is known as
    Atsakymas
    (C)
    superposition
  • 16
    Why does a piece of cork float on water?
    Atsakymas
    (B)
    the upthrust on it when completely immersed in water is greater than its weight in air
  • 17
    A rod of length 10cm is heated through 100oC and its final length is 10.26cm. What is the co-efficient of linear expansion of the rod?
    Atsakymas
    (B)
    0.00026 per degree centigrade
  • 18
    If the refractive index of a medium is \(\sqrt{2}\), what is the critical angle?
    Atsakymas
    (A)
    45o
  • 19
    In copper plating, a current of 0.5A is allowed for cathode area of 100cm2. If this current is maintained constant for 100 minutes, the thickness of the copper deposited will be approximately (the electrochemical equivalent of copper = 0.0003g/oC, density of copper = 10^4g/cm3 )
    Atsakymas
    (E)
    10-6mm
  • 20
    As a positively charge rod is brought nearer to the top cap of a positively charged gold leaf electroscope, the divergence of the leaves will
    Atsakymas
    (B)
    steadily increase
  • 21
    Which of the following statements is NOT true of \(\gamma\)-rays?
    Atsakymas
    (C)
    \(\gamma\)-rays obey the inverse cube law in air
  • 22
    A rocket burns 0.01kg of fuel each second and ejects it as a gas with a velocity of 5,000m/s. What force does the gas exert on the rocket?
    Atsakymas
    (C)
    50N
  • 23
    Which of the following statements is true of a body which is moving in a straight line with uniform acceleration? The velocity of the body
    Atsakymas
    (C)
    will increase with time in the direction of the acceleration
  • 24
    A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific latent heat of vaporization of water in J/kg is
    Atsakymas
    (E)
    5.0 x 105
  • 25
    A high-resistance voltmeter reads 3.0V when connected across the terminals of a battery on open circuit and 2.6V when the battery supplies a current of 0.2A through a lamp. The resistance of lamp is
    Atsakymas
    (B)
    13.00\(\Omega\)
  • 26
    A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are
    Atsakymas
    (D)
    90o and 0o
  • 27
    The equation P\(^x\)V\(^y\)T\(^z\) = constant
    Atsakymas
    (E)
    x = 1, y = 1, z = -1
  • 28
    The area under a force-distance graph represents
    Atsakymas
    (D)
    work
  • 29
    A hot metal ball is suspended in the open air. As it cools it loses heat by?
    Atsakymas
    (B)
    convection only
  • 30
    The range of accommodation of a normal human eye is
    Atsakymas
    (E)
    0.25m to infinity
  • 31
    A hydrometer is an instrument for measuring the
    Atsakymas
    (B)
    relative density of a liquid by the method of flotation
  • 32
    The point beyond which a stretched spring does not return to its original length is called the
    Atsakymas
    (B)
    elastic limit
  • 33
    A 10g mass placed on the pan of a spring balance causes an extension of 5cm. If a 15g mass is placed on the pan of the same spring balance, the extension is
    Atsakymas
    (C)
    7.5cm
  • 34
    In a radioactive series

    \( ^{235} _{92}L \to ^{235} _{92}M \to ^{231} _{90}N \to ^{231} _{91}\phi \)

    The particles emitted are respectively
    Atsakymas
    (C)
    \( \gamma , \alpha , \beta \)
  • 35
    Two taxis leave benin and agbor some 80km apart at 1200hr as shown above. from the distance time graph shown the distance of their meeting point P, from Benin and the time of their meeting are
    Atsakymas
    (B)
    29km, 1315hr
  • 36

    The water manometer above is measuring the pressure of gas supply. if the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury what is the total pressure of the gas supply in cm of water

    Atsakymas
    (E)
    955cm
  • 37

    in the image above, an incident ray XY makes an angle of 15\( ^{\circ} \) with a fixed line AY which is normal to surface of a plane mirror if the mirroe is turned as indicated by the arrow through \( 40^{\circ} \) what angle will the reflected ray make with AY

    Atsakymas
    (E)
    \( 95^{\circ} \)
  • 38

    the arrow represents an object in front of a convex mirror whose focal points are X and Y. The image formed is

    Atsakymas
    (B)
    Between P and Y
  • 39

    what is the resultant capacity of the circuit

    Atsakymas
    (A)
    1.5µF
  • 40

    what is the resultant resistance in the circuit given above

    Atsakymas
    (B)
    8Ω