2018 FUNAAB Physics Post-UTME

The velocity of sound in air is independent of

A body of mass 4kg is accelerated from rest by a steady farce of 9 N. What is its velocity when it has travelled a distance of 8 m?

I. Directed towards a fixed point

II. Direct away from a fixed point

III. Directly proportional to its displacement from the fixed point

IV. Inversely proportional to its displacement from the fixed point

From the information above, a body performing simple harmonic motion is one whose acceleration is?

Calculate the force between two planets of masses 3.0 x 10¹⁵ kg and 1.5 x 10²⁰ kg if their centres are 8.0 x 10¹⁰m apart [G=6.67 x 10^-11 Nm²kg^-2)

Calculate the minimum speed a body must have to escape from the moon’s gravitational field

[Mass of moon = 7.7 x 10²² kg, radius of moon = 1.7 x 10⁶ m and G 6.7 x 10^-11 Nm²kg²]

A microphone converts sound energy to

A body of mass 15kg falls from a height of 20m above the ground. What is the kinetic energy of the body just before it strikes the ground? [g=10mj]

Which of the following is true of static and dynamic friction?

A hydraulic press consists of two cylinders of cross- sectional area 0.3m² and 6.0m². If the piston in the smaller cylinder is pushed down with a force of 80N, what will be the force in the bigger cylinder?

The efficiency of a machine can be improved by

If a spring of length 20cm extends to 24cm when a mass of 16g is hung on it. By what length will it extend if a mass of 40g is hung on it?

The point at which the molecules of a loaded wire begin to slide across each other resulting in rapid increase in extension is the

A hydrometer reads 0.25 when dipped in kerosine and 0.12 in another liquid. Calculate the density of the liquid if the density of kerosine is 0.113 g

A climber on top of a very high mountain needs a pressure pot to cook his food because

Find the volume of a liquid that will have the same mass as 1 .8m of water [Density of water = 1000kgm = density of liquid 900kgm³]

I. Increase in length

II. Increase in surface area

III. Increase in volume

IV. Increase in density

When a metal is heated, which of the statements above will

The pressure of a gas in a closed container at 47°C is 1.6 x10⁵ Pa. What will be the pressure of the gas at – 33°C?

When a fixed mass of gas is kept in a sealed cylinder, the change in temperature is

A heater rated 15A, 12V is used to boil completely 2 kg of liquid to its gaseous state at the same temperature in 10 mm. Calculate the specific latent heat of vaporization of the liquid

The diagram above is a cooling curve for pure naphthalene. QR represents the period of

The rise in the level of water in a capillary tube when dipped into a bowl of water is an illustration of

The rate at which heat is transferred from one point to another in a material depends on its

A hunter fired a gun and heard the echo from a cliff 2.4sec later. If the speed of sound in air is 320 ms^-1 calculate the distance between the hunter and the cliff

Soft materials are used to cover the walls of sound studios in order to reduce the effect of

The diagram P and Q above represent sound waves of the same note. The difference between them is their

A consequence of rectilinear propagation of light is

The radius of curvature of a concave mirror is 18.0cm. If the image distance of an object placed before it is 36.0cm, calculate the linear magnification

The angle of minimum deviation and the refractive angle of a triangular glass prism are 30° and 60° respectively. Calculate the refractive index of the prism

During the dispersion of white light by a prism, the colour that is mostly deviated is

When a plastic rod is rubbed with a dry piece of cloth, the rod and the piece of cloth will

Calculate the effective capacitance between the Q in the circuit diagram above

 In a circuit designed to convert a. c. current to pure d. c.  current, the function of the capacitor is to

The electrolyte in the Nicke-iron (NiFe) accumulator is

Calculate the readings in the ammeter above neglecting the internal resistance

Three identical cells each of e.m.f. 2V and negligible internal resistance are connected in parallel with a 4V resistor in a circuit. Find the current in the circuit

What is the cost per kilowatt – hour of electricity if a man pays N360.00 for running 2 engines each rated 2500 W for 2 days?

 Steel is good for the production, of permanent magnets because it

The damping of the motion of a metal plate oscillating in a magnetic field demonstrates

An induction coil is generally used to

An inductor of 2H and negligible resistance is connected to a 12V mains supply 50/p. Find the current flowing in it

In an electrolysis experiment, a current causes a deposit of 1.05g of copper on the cathode of the voltmeter in 30 minutes. Calculate the value of the current.

[e.c.e. of copper 3.33 x 10^-7 kg C^-1]

When a magnetic field is applied transversely to the direction of radioactive emissions, the particles that are Mostly deflected are

The fission of a certain radioactive nucleus is accompanied by the release of 6.5 x 10¹¹ of energy. Calculate its mass defect

Calculate the half – life of a radioactive element of decay constant 3.0 x 10^-5 yr

If ^m_nX and ^p_qY are isotopes, then it means that

An n – type semiconductor has

Which of the following materials has a forbidden gap?

From the current – voltage graph of a junction diode above, which of the following statements can be inferred?

An ideal rectifier has

Thermal excitation is needed for electrical conductibility to start in