JAMB UTME - Physics - 1980

According to Ohm's law, the ratio V/I is constant for

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Heat is supplied to a block of ice 0^o until half of it has melted. Which of the following statements is true?

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What is the relative permitivity of a capacitor if its capacitance with a medium as dielectric is 16 farads and its capacitance with vacuum as dielectric is 2 farads?

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which of the following does NOT cause a reduction of the surface tension of water?

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A milliameter of resistance 5\(\Omega\) and full scale deflection of 5m A is to used to measure a potential difference of 50 V. The resistance of the multiplier should be

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Natural radioactivity consists of the emission of

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a pressure cooker saves both time and fuel in cooking because inside the cooker, the

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In the process of electrification by induction, the amount of induced charge in relation to the inducing charge is the

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If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is

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In sunlight, a blue flower looks blue because we see the flower by the light it

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In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is \( \beta \) which of following statements is true???

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A quantity of sungas at -133 occupies 1/3m³ under pressure 1.4 x 10⁵ Nm^-2. if the gas occupies 31 m^-2 at 37^oC, its pressure will be

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The total capacitance of the circuit above is

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Which of the following radiations cannot be deflected by a magnetic field?

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the ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expands by the same amount per unit rise in temperature. The ratio of their length is

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A given quantity of heat increases the temperature of 150grams of water from 9^oC to 15^oC and increases the temperature of oil of 100grams from 9^oC to 25^oC. The ratio of the specific heat of oil to that of water is

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The best material for the core of the primary and secondary coils of an induction coil is

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If the volume of a fixed mass of a gas is kept constant, the pressure of the gas

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In the diagram above, MN is perpendicular to ON and MR what is the difference between the moment about N of the force of 20 Newtons applied along MP an its moment about 0

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Which of the following statements are true in the structure of atoms?

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The activity of a radioactive substance depends on

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Which of the following statements about sound is NOT true?

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In a compound microscope

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The Diagram above shows the prism arrangement in a

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What is the total resistance in the above diagram

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Which of the following physical quantities is NOT a vector?

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A cell has an open circuit voltage V₁ and a closed circuit voltage V₂ when a current is flowing through it. Therefore, the internal resistance of the cell is

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The motion of the moving skin of a talking drum can rightly be described as

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Which of the following is true of an electrical charge?

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A magnet is similar to a bipolar charged system in that

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An object of mass m and volume v, is totally immersed in a liquid of density p. The tension of a string holding it is

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Which of the following statements is NOT true of the image in a plane mirror? The image is

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Which of the following are true of atom?

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The water at the bottom of a waterfall is slightly warmer than that at the top because part of the

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A tugboat is travelling from Asaba to Onitsha across the River Niger with a resultant velocity of 20 knots. If the river flows at 12 knots, the direction of motion of the boat relative to the direction of water flow is

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A man stands one-third of the way between two walls and claps his hands, He hears two distinct echoes 1s apart. If the speed of sound is 330ms^-1 the distance between the wall is

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In the study of physics, temperature and heat are often confused with each other. Which of the following statements correctly defines these two element?

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Which of the following statements on the use of X-rays is incorrect? X-rays are used

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Any line or section through an advancing wave in which all the particles are in the same phase is called the

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a calorimeter of thermal capacity 80j contains 20g of water at 25^oC. Water at 100^oC is added so that the final temperature of the set-ups is 50^oC. The amount of water added is (Heat capacity of water = 4.18J/g/^oC)

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The name given to the characteristics behaviour of substances which set their length perpendicular to a strong magnetic field instead of in line with it is

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What is the acceleration of a particle whose motion is graphically displayed in the diagram above

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Given that SQ = 10cm and SP = 6cm, the refractive index of a block of glass shown above is

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High Tension(H.T.) transmission means

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A stand-by generator is connected to fifteen 40 W lamps and musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours?

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The relative densities of zinc, brass, copper, gold and silver are respectively 7.1, 8.5, 8.9, 19.3, 10.5. A metal ornament which weighs 0.425kg and can displace 50 x 10^-6m³m of water is made of

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Which of the following elements is the best absorber of X-rays?

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Which of the following statements are true of the law of universal gravitation?

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