JAMB UTME - Physics - 1979

Which of the following is the correct definition of 'half-life'?

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Fig 8 shows a current I flowing in a copper wire situated in a magnetic field existing between the pole-pieces of a horse-shoe magnet.
Which of the following statements is correct?

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fig 10 shows a see-saw which is perfectly in balance, the weighs of the people sitting on it are 50kg, xkg and 15kg as shown, the sit at distances of 1.5, 1.5 and 2m from the pivot respectively. The vale of X is

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If a given mass at constant pressure obeys the relation...volume is proportional to the absolute temperature...the gas is said to obey

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If the wavelength of a wave travelling with a velocity of 360ms^-1 is 60cm, the period of the wave is

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When the vapour of a substance is in equilibrium with its own liquid, it is said to be

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A concave lens of focal length 20cm form an image 1/2 the size of the object. The object distance is

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Radio carrier waves are generated by causing electrons to oscillate rapidly in

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The temperature at which the water vapour present in the air saturates the air and begins to condense is known as

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Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?

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An air column 10cm in length is trapped into the sea end of a capillary tube by a 15cm column of mercury with the tube held vertically as shown above. On inverting the tube the air column becomes 15cm long. The atmospheric pressure during the experiment is

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Which of the following statements is incorrect? The sensitivity of a galvanometer which incorporates an optical lever arrangement may be increased by providing

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Which of the following statements is true? The frequency of a vibrating string is

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Which of the following statements about radioactivity are true? i. alpha particle is positively charged ii. Beta particle is negatively charged iii. Gamma ray is neutral iv. Beta particle has the same mass as helium atom v. Gamma ray is charged

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A capacitor and a resistor are connected in series with each other and in series with an accumulator of negligible internal resistance. The potential across the terminals of the capacitor is

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Which of the following statements defines correctly the efficiency of a machine?

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A landlord has eight 40W electric light bulbs, four 60W bulbs and two 100W bulb in his house. If he has all the points on for five hours daily and if N.E.P.A. charges 5k per unit, his bill for 30 days is

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The heights of the mercury thread in a mercury-in-glass thermometer when in melting ice and then in steam are 3cm and 18cm respectively. At a temperature of 60^oC the height would be

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In a resonance tube experiment, which is illustrated above, the velocity of sound in air is 327.68m/s, the frequency of the turning fork used is therefore

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An electrical circuit is connected up as shown above, which of the following is correct about the value of current flowing through the 1 ohm resistance?

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Which of the following statements is correct? The reading of pressure on a mercury barometer is independent of

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In a given circuit, the cell P has an emf 1.5V and an unknown internal resistance while cell Q has an emf 2.0V and an internal resistance of 1 ohm if the ammeter reads 50m A, Then r is equal to

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All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?

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On which of the following is the operation of a moving coil galvanometer based?

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If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of

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A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is

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In an electrolysis experiment, a cathode of mass 5g is found o weigh 5.01g after a current of 5A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance?

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For the wave motion represented above

The wavelength is given by

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What are the units of thermal conductivity?

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Which of the following statements is correct? The magnetized state of an iron bar can be destroyed completely by

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A man standing between two parallel mirrors in a barber's shop will see the following number of his own image

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Two closed vessels contain equal volumes of boiling water and are identical except that one is blackened on the outside while the other is polished. Which of the following is correct?

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A weight of 1000 grams hangs from a lever 20cm to the fulcrum. At the left is a 500-gram weight 20cm from the fulcrum, and a 200-gram weight x cm away from the fulcrum. What is the value of x that will make the lever balanced?

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A uniform bean HK of length 10m and weighing 200N is supported at both ends as shown above. A man weighing 1000N stands at a point P on the beam. If the reactions at point H an K respectively are 800N and 400N, Then the distance HP is

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fig 12 shows the velocity time graph of a car which starts from rest and is accelerated uniformly at the rate of 3m sec^-2 for 5 seconds. It attains a velocity which is maintained for a minute, The car is then brought to rest by a uniform retardation after another 3 seconds. calculate the total distance covered

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The diagram shows lens arrangement in

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An object is placed 30cm from a concave mirror of focal length 15cm. the linear magnification of the image produced is

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Which of the following statements is correct? Silvered walls of a vacuum flask are used to prevent

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Which of the following types of waves cannot travel through a vacuum?

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The density 400cm³ of palm oil was 0.9gcm^-3 before frying. If the density of the oil was 0.6gm^-3 after frying,assuming no loss of oil due to spilling, its new volume was

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The speed of light in air is 3 x 10⁸ms^-1. If the refractive index of light from air-to-water is \(\frac{4}{3}\), then which of the following is the correct value of the speed of light in water?

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An air bubble rises from the bottom to the top of a water dam which is 40m deep. The volume of the bubble just below the surface is 2.5cm³. Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to 10m water

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Which of the following electromagnetic waves has the shortest wavelength?

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An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?

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It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?

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The bulb of a motorcycle head-lamp is marked 40W, 6V. The resistance of the filament when it is switched on is

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A 500kg car which was initially at rest travelled with an acceleration of 5m sec^-2, its kinetic energy after 4 seconds was

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In what range of temperature is the expansion of water anomalous?

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