JAMB Physics 1984 past questions

The distance travelled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is linear. The slope of this graph is a measure of

Which of the following is NOT a fundamental S.I. unit?

P T Q R S 0.1N 0.4N Fig. 1 In Fig. 1, PT is a uniform metre rule pivoted at R, the 70cm mark. Two forces 0.1N and 0.4N are applied at Q, the 60cm mark and S. the 85cm mark. If the metre rule is kept in equilibrium by the forces and its weight, then the weight of the metre rule is

2Ohms 2Ohms 3 Ohms 4Ohms Fig. 2

For which of the underlisted quantities is the derived unit ML2T-2 correct? I Moment of a force II Work III Acceleration

What volume of alcohol with a density of 8.4 x 102kg m-3 will have the same mass as 4.2m3 of petrol whose density is 7.2 x 102kg m-3?

For correcting long sight defects in the human eye we require a

For a concave mirror to form a real diminished image, the object must be placed

The unit quantity of electricity is called

The resistance of a wire depends on

Two cells, each of e.m.f. 1.5V and an internal resistance 2Ohms are connected in parallel. Calculate the current flowing when the cells are connected to a 1 Ohms resistor.

Which of the following components is NOT contained in a dry cell? A [PAGE 9]

Which of the following can be described as high tension transmission?

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

When vibration occurs in an air column, the distance between a node and an antinodes is equal to

Which of the following statements is (are) NOT correct? I Pressure changes do not affect the speed of sound in air II The velocity of sound increases with temperature III The quantity of a note depends only on its frequency.

Of two identical turning forks with natural frequency 256 Hz, one is loaded so that 4 beats per second are heard when they are sounded together. What is the frequency of the loaded turning fork?

Dew point is the temperature at which water vapour in the atmosphere

The lower and upper fixed points marked on a mercury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?

If a solid changes directly into a gas when heat is applied the process is called

Force (N) 0 5 1 0 15 20 Fig. 4 Distance (m) [PAGE 10] body by the force during the first 10 metres of motion is

Which of the following statements describes an atom accurately? I Atoms of all elements are identical II An atom contains a nucleus and number of electrons. III Due to the electrons in the atom, an atom is negatively charged. IV Electrons in the atom move in circular orbits round the nucleus.

Heat is supplied uniformly at the rate of 100W to 1.0 x 10-2kg of a liquid for 20 seconds. If the temperature of the liquid rises by 50C, then the specific heat capacity of the liquid is

Which of the following properties of matter CANNOT be utilized for temperature measurement? The

Which of the following statements about the compound microscope and astronomical telescope is (are) correct? I The final image of a compound microscope is located at infinity. II The final image of the astronomical telescope is always erect. III The objective lens of a compound microscope has a very short focal length.

The electromotive force obtained from a simple dynamo may be increased by

I S II N III Earth’s magnetic field Fig. 5 A short bar magnet is placed in the earth’s magnetic field as shown in Fig. 5. Which of the points II and II is (are) possible position(s) of a natural point?

4 UF 3 UF 4 UF 2 UF Fig. 6 In the circuit in Fig. 6, calculate the effective capacitance between X and Y.

Normal atmospheric pressure at sea-level is 105N m-2 and the acceleration due to gravity is approximately 10m s-1. If the atmosphere has a uniform density of 1kg m-3, its height is

Which of the following is a correct explanation of the inertia of a body?

If a water pump at Kainji Dam is capable of lifting 1000kg of water through a vertical height of 10m in 10s, the power of the pump is

What is the apparent colour of a RED SHIRT when viewed in PURE green light?

The spectrum of white light consists of coloured lights arranged in the following order

Cathode rays are

Which of the following I â-particles II Protons III Neutrons IV á-particles may be found in light nuclei?

Radio waves have a velocity of 3 x 108m s-1. A radio station sends out a broadcast on a frequency of 800 kHz. The wavelength of the broadcast is

X 4Ohms Y 6Ohms Fig. 7 In the diagram above (Fig. 7), X and Y are resistances 45 ohms and 65 ohms respectively. If power dissipation in X is 10W, then power dissipation in Y is

What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?

Which of the following statements is (are) NOT true about the emission of photoelectrons from metallic surfaces? I All metallic surfaces emit the same number of photoelectrons in a given light. II Most metallic surfaces in visible and infrared light. III A metallic surface emits photoelectric only if frequency of the incident light is higher than its own characteristic threshold frequency.