Physics — 2004

The molecular structure of a liquid is such that

Which of the following statements about the mass and the weight of a body is not correct? its

An object weighs 60.0N in air, 48.2N in a certain liquid X, and 44.9N in water, Calculate the relative density of X

Calculate the change in volume when 90g of ice is completely melted. [density of water = 1g cm -3 , density of ice = 0.9cm -3 ]

The diagram above represent displacement D, versus time, t graph of a progressive wave. Deduce the frequency of the wave

Which of the following concept is not an evidence of the particle nature of matter?

A diver is 5.2m below the surface of water of density 1000Kgm -3 . If the atmospheric pressure is 1.02 x 10 5 pa. Calculate the pressure on the diver [g = 10ms -2 ]

A steel needle floating on water, sinks when kerosine is added to the water. This is because the kerosine

On which of the following factor does the viscosity of a liquid depend? i. Nature of the liquid. ii. Temperature of the liquid. iii. Area of the liquid surface

An elastic string of force constant 200N m -1 is stretched through 0.8m within its elastic limit. Calculate the energy stored in the string

A machine of velocity ratio 5 is used in lifting a load with an effort of 500N. If the machine is 80% efficient. Determine the magnitude of load

The speed of an object in rectilinear motion can be determine from the

A body is said to be moving with uniform acceleration if it experiences equal

A body is dropped from a certain height above the ground level, falls with uniform

A body of mass 8kg moving with a speed of 30ms -1 is brought to rest in 2.5s by a constant retarding force. Calculate the magnitude of the force

A force acting on a body causes a change in the momentum of the body from 12kg ms -1 to 16kg ms -1 in 0.2s. calculate the magnitude of the force

The bob of a single pendulum has a mass of 0.02kg. Determine the weight of the bob [g = 10ms -2 ]

A ball bearing is projected vertically upwards from the ground with a velocity of 15ms -1 . Calculate the time taken by the ball to return to the ground [g = 10ms -1 ]

A loaded spring performs simple harmonic motion with an amplitude of 5cm. If the maximum acceleration of the load is 20cm s-1, calculate the angular frequency of the motion

When compared with water, mercury is preferred as a thermometric liquid because

Which of the following values on the absolute scale of temperature is the ice point?

On a cold day, a concrete floor feels colder to the bear foot then a mat on the same floor because the

When a metal ball is heated through 30oC,its volume becomes 1.0018cm3. If the linear expansivity of the material of the ball is 2.0 x 10-5 K-1, calculate its original volume

A faulty barometer reads 72.6cm Hg when the atmospheric pressure is 75.0cm Hg. Calculate the atmospheric pressure when the barometer reads 72.0cn Hg

On a basis of the kinetic theory, an increase in the temperature of a fixed volume of an ideal gas causes

The temperature of 900cm 3 of an ideal gas at a pressure of 114cm Hg is 27 o C. Calculate its volume at 76cm Hg and 0 o C

The basic difference between a transverse wave and a longitudinal wave travelling in the same direction in a medium is in the

A wave travelling from water to glass suffers a change in its speed at the common boundary. Which of the following properties explains this observation?

The image of an optical pin placed at the principal focus of a concave mirror will be formed

A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera

During a thunderstorm, lightning and thunder occurred simultaneously in the atmosphere. An observer on the earth surface's sees the lightning flash shortly before hearing the thunder. This is because the

A magnified and virtual image of a near object is produced by

A girl stand 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms -1 , how long would it take for her to hear the echo of the sound?

Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To

The sound from a vibrating tuning sound is when the tip of its stem is placed on a wooden table than when in air because

Charges on a conductor are

Which of following functions is performed by manganese IV oxide in the Lenclanche cell?

A car fuse marked 3A operates optimally on a 12V battery, calculate the resistance of the fuse

Find the cost of running a 60W lamp for 24 hours. If 1kW hr cost 5 naira

The quantity of electric charge stored in a capacitor is measured in

Calculate the energy stored in a 20\(\mu F\) capacitor. If the p.d between the plates is 40V

Given that the gravitational constant is G. Newton's universal law of gravitation states that the force of attraction between two masses M 1 and M 2 separation by a distance r is

A charge of 1.6 x 10 -10 C is placed in a uniform electric field of intensity 2.0 x 10 5 NC -1 . calculate the magnitude of the electric force exerted on the change

Which of the following statements is not correct?

The main function of the mouth piece of a telephone is that it converts sound energy to

An atom is normally electrically neutral because the

In which of the following devices is the principle of photoelectric effect not applicable?

Which of the following statements about X-rays is not correct? They

A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass

Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?

In an experiment using a converging lens to produce real images on a screen, the linear magnification m, is plotted against the image distance v, as illustrated in the diagram below. The distance OP represents the