JAMB UTME - Physics - 1982
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A hydrometer is an instrument for measuring the
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A hydrometer is an instrument used to measure the relative density of a liquid by the method of flotation. It consists of a graduated glass tube with a weight at the bottom to make it float vertically in the liquid. The level at which the surface of the liquid touches the scale on the tube is a measure of the relative density of the liquid. Hydrometers are commonly used in industry and laboratories to measure the density of liquids such as acids, alkalis, and electrolytes.
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If the refractive index of a medium is V2, what is the critical angle?
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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
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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
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An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is
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A Uniform beam PQ of mass 20kg and length 5m is balanced as shown above, a man of weight 800N stands at M such that QM = 2m. The reaction at P and Q respectively are(take g = 10ms-2)
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A mango fruit drops from a branch 10m above the ground, just before hitting the ground its velocity is (g = 10ms-2)
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Two mirrors of the same length are arranged as shown above, a ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through
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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
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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?
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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
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Tambaya 18 Rahoto
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
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Tambaya 19 Rahoto
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)
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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
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what is the resultant capacity of the circuit
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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
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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
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The combination of sound waves with different frequencies is known as
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The value of the series resistor required to convert the above galvanometer into a voltmeter with a full range deflection of 15V is
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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
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The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a
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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?
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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
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Tambaya 31 Rahoto
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
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Tambaya 33 Rahoto
Which of the following statements is NOT true of \(\gamma\)-rays?
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a body is acted upon by forces applied at points P and Q as shown above their resultant is equal to
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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
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A hot metal ball is suspended in the open air. As it cools it loses heat by
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Tambaya 38 Rahoto
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 )
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Tambaya 39 Rahoto
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
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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 by 57°C. The tyre pressure had by the afternoon was
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a body of mass 10kg on a smooth inclined plane is connected to a smooth pulley to a mass of 15kg as shown above, the acceleration of the system is
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The point beyond which a stretched spring does not return to its original length is called the
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Tambaya 43 Rahoto
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
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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
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In a radioactive series
\( ^{235} _{92}L \to ^{235} _{92}M \to ^{231} _{90}N \to ^{231} _{91}\phi \)
The particles emitted are respectively
