JAMB Physics 1994 past questions

The diagram above shows a uniform wood of weight 200 N and length 50 m. it is pivoted at one end and suspended by a cord at the other end at an angle of 30o to the wood. Calculate the tension in the cord if the wood is horizontal.

An object of mass 50 kg is released from a height of 2 m. find the kinetic energy just before it strikes the ground.

Calculate the magnitude of the force required to just move a 20 kg object along a horizontal surface if the coefficient of friction is 0.2

In the diagram above, if the atmospheric pressure is 760 mm, the pressure in the chamber G is

Which of these statements are TRUE of pressure in liquids? I Pressure acts equally in all directions. II Pressure decreases with depth. III Pressure at the same level of a liquid is the same. IV Pressure is dependent on the cross-sectional area of the barometer tube.

The mass of a specific gravity bottle is 15.2 g when it is empty. It is 24.8 g when filled with kerosene and 27.2 g when filled with distilled water. Calculate the relative density of kerosene.

If a solid X floats in liquid P of relative density 2.0 and in liquid Q of relative density 1.5, it can be inferred that the

The melting point of naphthalene is 780C. What is this temperature in Kelvin?

When 100 g of liquid L1 at 78oC was mixed Xg of liquid L2 at 50oC, the final temperature was 66oC. Given that the specific heat capacity of L2 is half that of L1, find X.

Heat is supplied to a test tube containing 100 g of ice at its melting point. The ice melts completely in 1 min. what is the power rating of the source of heat?

If a room is saturated with water vapour, the temperature of the room must be

The equation of a transverse wave traveling along a string is given by y = 0.3 sin (0.5x – 50t) where y and x are in cm and t is in seconds. Find the maximum displacement of the particles from the equilibrium position.

The sound from a source traveled to the bottom of the sea and the echo was heard 4s latter. If the speed of sound in sea water is 1500 ms-1, the depth of the sea is

The fundamental frequency of vibration of a sonometer wire may be halved by

The note produced by a stretched string has a fundamental frequency of 400 Hz. If the length of the string is doubled while the tension in the string is increased by a factor of 4, the frequency is

To produce a parallel beam of light from a concave mirror, the distance at which the lamp should be placed from the mirror is equal to

Light of frequency 6.0 x 1014 Hz traveling in air is transmitted through glass of refractive index 1.5. Calculate the frequency of the light in the glass.

An object is placed in front of a converging lens of focal length 200 cm. The image is virtual and has a magnification of 2. what is the distance of the object from the lens?

An object is placed directly below a glass block of thickness 3.0 cm. Calculate the lateral displacement of the object if the refractive index of the glass is 1.5

In a projection lantern of focal length ƒ, the object distance u, is such that

If the Nigerian flag (green, white, green) is viewed in pure yellow light, which of the following set of colours would be observed on the flag?

Which of the following has the lowest internal resistance when new?

When biro pen rubbed on a dry silk cloth is moved very closed to a piece of paper on a dry table, the pen is found to pick up the paper. This is because

In the figure above, XY is of length 1m. The value of R at balance point Z is

Two resistors, R1 = 4Ohms and R2 = 5 Ohms, are connected in parallel across a potential difference. If P1 and P2 represent the power dissipated in R1 and R2 respectively, the ratio P1 :P2 is

In the circuit diagram above, calculate the current in the 12 – Ohms resistor if the cell has an e.m.f. of 12V and an internal resistance of 1 ohms.

Which of the following are found in the receiver but not in the microphone of a telephone handset? I Diaphragm II Soft iron ole pieces. III Permanent magnet. IV Carbon blocks

If two parallel conductors carry currents flowing in the same direction, the conductors will

In the curve above, PQRST represents an alternating voltage frequency 50 Hz. The time interval between point P and R on the graph is

If the light with photon energy 2 eV is incident suitably on the surface of a metal with work function 3 eV, then