JAMB Physics 2019 Past Questions

The limiting frictional force between two surface depends on

I. the normal reaction between the surfaces

II. the area of surface in contact

III. the relative velocity between the surfaces

IV. the nature of the surface

If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

When blue and green colours of light are mixed, the resultant colour is

A metal rod has a length of 100cm at 200\(^oC\). At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 x 10\(^{-5}C^{-1}\)

According to kinetic molecular model, in gases

The value of T in the figure above is

A train has an initial velocity of 44m/s and an acceleration of -4m/s\(^2\). Calculate its velocity after 10 seconds

Lamps in domestic lightings are usually in

During the transformation of matter from the solid to the liquid state, the heat supplied does not produce temperature increase because

In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long. The resistance to be tested is connected to that end and a standard resistance of 3.6\(\Omega\) is connected to the other end of the wire. Determine the value of the unknown resistance

Electrons were discovered by

Which of the following is/are the limitations to the Rutherford's atomic models?

I. It is applicable when energy is radiated as electrons are revolving

II. It is applicable when energy is radiated in a continuous mode

III. It is applicable to an atom with only one electron in the other shell

Which of the following equations is the correct definition of the reactance of an indicator L?

Ripple in a power supply unit is caused by

When th temperature of a liquid is increased, its surface tension

The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?

The pin-hole camera produces a less sharply defined image when the

A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field

The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.

When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is

Aluminium is sometimes used as the leaf of an electroscope because it

The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?

A supply of 400V is connected across capacitors of 3μf and 6μf in series. Calculate the charge

A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator

A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure

An alternating current can induce voltage because it has

The limiting frictional force between two surfaces depends on
I. the normal reaction between the surfaces
II. the area of surface in contact
III. the relative velocity between the surfaces
IV. the nature of the surfaces

During the transformation of matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because

The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?
I. Lagging the Calorimeter
II. Ensuring that only S.I units are used
III. Weighing the calorimeter, the lid and the stirrer.

In the molecular explanation of conduction, heat is transferred by the

The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission

Which of the following media allow the transmission of sound waves through them?
I. air
II. liquid
III. solids

The earth's gravitational field intensity at its surface is about
(G = 6.7 × 10\(^{-11}\)Nm\(^2\)/kg\(^2\), mass of the earth is 6 × 10\(^{24}\)kg, radius of the earth is 6.4 × 10\(^6\)m, g on the earth = 9.8m/s\(^2\))

The following are parts of the eye
I. Retina
II. Pupil
III. Iris
The correct equivalent in the camera in the same order are

According to kinetic molecular model, in gases

A force of 6N acts horizontally on a stationary mass of 2kg for 4s. The kinetic energy gained by the mass is _________

The momentum of a car moving at a constant speed in a circular track

A metal rod has a length of 100cm at 200°C. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the nod is 2 × 10\(^{-5}\)C\(^{-1}\)

The lead-acid accumulator consists of

When water is boiling, it

A mixture of blue and red pigment when illuminated by white light will appear

A siren having a ring of 200 hole makes 132 rev/min. A jet of air is directed on the set of holes. Calculate the frequency and wavelength in air of the note produced (take v = 350m/s)

A man on a bench will exert the greatest pressure on the bench when he

Gases conduct electricity under

Neutrons were discovered by

The mass of a nucleus is the

Three resistors with resistance 200Ω, 500Ω and 1kΩ are connected in series. A 6v battery is connected to either end of the combination. Calculate the potential difference between the ends of 200Ω resistance.

An a.c of 1A at a frequency of 800 cycles per second flows through a coil, the inductance of which is 2.5mH and the resistance of which is 5Ω. What is the power absorbed in the Coil?

In semi-conductor, the carriers of current at room temperature are