PHYSICS PAST QUESTIONS & ANSWERS

The diagram above illustrates a wave setup between two fixed ends 4.0m apart. If the speed of the wave is 1.0 , its wavelength and frequency respectively are

Total internal reflection. i. is a phenomenon of refraction of light. ii. occurs when light rays travel into a denser medium. iii. occurs when the critical angle is just exceeded. iv. is a phenomenon of reflection of light. Which of the statements above are correct?

A plane is inclined at an angle $\theta$ to the horizontal. Its velocity ratio is

Which of the following substances lowers the surface tension of water?

Thermal energy added or removed from a substance that changes the state of the substance is called

A battery of emf 24V is connected to three resistor P, Q and R as illustrated in the diagram. Determine the voltage across the resistor Q

The diagram above illustrates two waves of equal amplitudes A and frequencies approaching each other. When the two waves meet at a point I midway between them, the vertical displacement of the resulting wave will be

A ball is dropped from the top of a tower. Due to air resistance,it reaches terminal velocity. Which of the following statement(s) about its motion is/are correct? i. The acceleration of the ball is zero. ii. The net force on the ball is zero. iii. The velocity of the ball increases.

Two strings each inclined at an angle 30^o to the horizontal are used to hold a bucket of water weighing 20N. Calculate the tension i n each string.

Which of the following factors does not increase the rate of evaporation of water in a lake?

A body of mass m moving around a circle of radius r with a uniform speed v experiences a centripetal force F. The work done by the centripetal force on it is

In the clinical thermometer, the function of the kink is to

i. Prevent the back flow of mercury after use.

ii. Ensure the back flow of mercury after use.

iii. Maintain the thermometric property of mercury.

iv. Allow the temperature attained to be read.

The S.I unit for sound energy is

In a school compound a girl walks 40km due east from the laboratory to the staff room to submit her report. Then she returns and walks 30m due north to her classroom. Determine the magnitude of her displacement from the10m laboratory

The angle at which a projectile must be fired to cover maximum range is

A rainbow is formed when sunlight is incident on water droplets suspended in the air due to

An object of volume 400cm³ and 2.5gcm^-3 is suspended from a spring balance with half its volume immersed in water. Determine the reading on the spring balance. (Density of water = 1gcm^-3)

The diagram given is used to determine the

Two plane mirrors are inclined at an angle 20° to each other. Determine the number of images formed when an object is placed between them.

A ray of light incident at an angle $\theta$ in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value of the angle. [Absolute refractive index of the material of the prism is 1.5]

A pressurized perfume bottle is left on the window pane of a room. What happens to he gas molecules of the perfume on a sunny day? They

X-rays and infrared rays are both electromagnetic. Which common property do the waves have? Both waves

A vapour whose molecules are in dynamic equilibrium with those of its own liquid is said to be

Which of the following units is derived?

The slope of a straight-line velocity-time graph represents

Which of the following electromagnetic waves is most energetic?

Which of the following processes is not a surface phenomenon?

According to Newton's law of cooling, the heat energy lost per unit area of a body depends on the

I. Surface area

II. Nature of the surface

III. Temperature of the surface

IV. Excess temperature over the surroundings

An object floats in a fluid when it displaces it's

The diagram given illustrates the waveform of a note produced by vibrations in an air column of length L. If the speed of sound in air is V, derive an expression for the frequency of the notes

Which of the following statements about the 3rd overtone of a vibrating air column of an open pipe is correct? It has

The diagram above illustrates a block ans tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E

Which of the following graphs correctly represents the relationship between the kinetic energy (K.E) and the displacement (d) from point of release of a swinging pendulum bob?

Which of the following statements about matter is not correct?

A student measures the volume of a liquid using a measuring cylinder. What else needs to be measured by the student in order to determine the density of the liquid?

In an experiment in which a molten substance is allowed to cool, the cooling curve above was obtained. The temperature 60^oC is known as the

Which of the following quantities are dimensionally independent?

I. Dielectric constant

II. Momentum

III. Efficiency

IV. Refractive index

The image formed by a concave mirror is real, inverted and magnified, when object is placed

The maximum density of water occurs at a temperature of

The continuous stirring in the method of mixtures to determine the specific thermal capacity of a substance ensures

The diagram above illustrates the mercury-in-glass thermometer used for determining the temperature of a room. Use the data on it to determine the room temperature.

The mouth piece of a telephone handset converts

The diagram above illustrates a beaker of water being heated. It is observed that as the bubbles rise they get bigger in size.The reason for this observation is

The bob of a simple pendulum takes 8.0s to complete 10 oscillations. Determine the frequency of oscillation of the bob.

A body is whirled round a circular path at constant speed. Which of the following diagrams correctly indicates the direction of the body's velocity (v) and its acceleration (a)?

A chemical balance is used for measuring

Which of the following statements correctly defines the boiling point of a liquid? The temperature at which the

Resonance occurs when one vibrating object causes a second object to vibrate at its own natural

A ball is projected horizontally from the top of a tower. Neglecting air resistance, which of the following statements about its motion is/are correct?

I. Vertical acceleration on the ball decreases as it falls

II. The vertical force on the ball remains constant

III. The vertical speed of the ball increases as it falls

Which of the following devices converts light energy to electrical energy?

Frequency is measured in

The graph of density against temperature for water is correctly illustrated by

The pair of musical instruments that works on the vibration of air in pipes is

During a training session, two footballers pass a ball repeatedly between each other. The 'to and fro' motion of the ball is not simple harmonic because the

I. Acceleration of the ball is not directed towards a fixed point

II. Restoring force is not directed towards the centre

III. Acceleration of the ball is not directly proportional to the displacement from a fixed point

Which of the statements above are correct?

A quantity of hot water at 100^oC is added to 400g of water at 10^oC until the temperature of the mixture is 60^oC.

Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg^-1 K^-1]

A plank is placed along the path on which a wheel barrow containing sand is pushed at a construction site to prevent it from sticking as illustrated in the diagram given. The large area of the plank prevents the wheel barrow from getting stuck by

The diagram given illustrates a force-distance graph for the motion of a wooden block. Determine the work done on the block when moved through a distance of 5m.

A dam is able to hold a large quantity of water because its wall is

The diagram above is a micrometer screw gauge. Determine its reading

When a body is thrown vertically upwards, its velocity at the maximum height is