JAMB UTME - Physics - 1980

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

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)

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?

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

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

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

High Tension(H.T.) transmission means

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

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

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

Which of the following physical quantities is NOT a vector?

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

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

The Diagram above shows the prism arrangement in a

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

A magnet is similar to a bipolar charged system in that

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???

In a compound microscope

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

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

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

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

Which of the following are true of atom?

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

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

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?

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

What is the total resistance in the above diagram

Natural radioactivity consists of the emission of

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

The total capacitance of the circuit above is

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

The activity of a radioactive substance depends on

Which of the following statements about sound is NOT true?

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

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

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

Which of the following is true of an electrical charge?

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

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

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

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

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

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

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

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

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

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