JAMB Physics 2005 Past Questions

Marching soldiers crossing a suspension bridge are usually advised to break their steps to avoid damaging the bridge owing to

The sharpness of the boundary of the shadow of an object is determined by the

A thin converging lens has a power of 4.0 diopters determined its focal length.

A real image three times the size of an object is formed 24cm from a converging mirror. what is the focal length of the mirror.

The pair of physical quantities consisting of vectors only are

In an ideal wheel an axle system, R stand for the radius of the wheel and r is the radius of the axle. the mechanical advantage is

An object is projected for the hieght of 80 m above the ground with a velocity of 40ms^-1 at the angle of 30° to the horizontal. The time of flight

In an a.c circuit that contains only a capacitor, the voltage lags behind the current by

the time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32of its original number is

a proton moving with a speed of 1.0 x 10⁶ms^-1 through a magnetic field of 1.0T experiences a magnetic force of magnitude 8.0 x 10^-14 N. The angle between the proton''s velocity and the field is

When impurities are added to semi-conductors, the conductivity of the semi-conductor

A silicon material is dopped with an element of a certain group and an n-type semi-conductor is formed. the most likely group of the element is

The charge carriers in gasses are

the ray which causes gas molecules to glow is known as

the ray which causes gas molecules to glow is known as

A transformer is rated 240v. If the primary coil is 4000 turns and the secondary voltage 12v, determine the number of turns in the secondary coil.

The current in a reverse-biased junction is due to?

which of the following materials is a conductor?

When the temperature difference between the wet and dry bulbs of a hygrometer is high, this indicates that

A 3m³ volume of liquid W of density 200kgm³ is mixed with another liquid L of volume 7m³ and density 150kgm^-3. the density of mixture is?

A body of mass 36kg falls through a viscous liquid which offers a drag force of 260N on the body. The upthrust on the body at terminal velocity is?


[g = 10ms²]

The process whereby the molecules of different substances move randomly is called?

I. reproducibility

II. Sensibility

III. High terminal capacity

iv. High accuracy

The quantities of a good thermometer include?

The process whereby a liquid turns spontaneously into vapour is called?

I. Melting

II. Boiling

III. Refraction

IV. Conduction

Which combination of the above is evident of the molecular nature of matter?

When very hot water is poured into two identical thin and thick glass tumblers in equal volumes, the thick one cracks because?

Satellite communication network makes use of?

An electric device is rated 2000 W, 250 v. The correct fuse rating of the device is?

The north pole of a magnet can never be separated from the south pole because of the property knowledge as?

A car battery rated 45 A H is charged with a charger whose rating is 2.5A.How long will it take to charge the battery full?

The electric field intensity in a place where a charge of 10^-10c experiences a force of 0.4N is?

Two charged particles are projected into a region where there is a magnetic field perpendicular to their velocities. if the charges are deflected in opposite directions, which of the following statements is true of the charge?

The resistance of a pieces of wire of lenght 20m are crossed-sectional area 8 x 10 ⁶m²is?


[Resistivity of the wire = 4 x 10^-7 Ω m]

The figure above shows a plot of angles of deviation through a glass prism when light is incident at θ degrees on the prism. The incident angle that produces the minimum deviation is

The value of F in the figure above when in equilibrium is

In the figure above, the coefficient of static friction is 0.5. If the tension in the string is T, the acceleration of the system in motion is

If the system above is in equilibrium, the tension in the string Q is

In the figure above, the work done by the force of 100N inclined at an angle of 60^o to the object dragged horizontally to a distance of 8m is

In the circuit diagram of a transistor above, the terminal P, Q and R represent

\( ^{235} _{92}U + ^1 _0n → ^{144} _{56}Ba + ^{90} _{36}Kr +2X \)

In the reaction above, X is

Two liquids L₁ and L₂ are contained in a U - tube. The height and the density of L₁ are 8 cm and 10³ kgm^-3 respectively. If the density of L₂ is 800 kgm^-3, its height measured from the same level is

10⁶J of heat is required to boil off completely 2kg of a certain liquid. Neglecting heat lost to the surroundings, the latent heat of vaporization of the liquid is

The figure above shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d across the system is 12V, the p.d, across the 6μF capacitor is

If the distance between two point charges its increased by a factor of four, the magnitude of the electrostatic force between them will be

The velocity of sound in air will be doubled if it's absolute temperature is

A force of 200N acts between two objects at a certain distance apart. The value of the force when the distance is halved is

If two inductors of inductances 3H and 6H are arranged in series, the total inductance is

Am elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is