Physics — 2006
WASSCE · 50 questions · Answers included
50 questions
Which of the following phenomena causes capillary of liquids in tubes of narrow bore?
Which of the following physical quantities are derived? i. Area ii. Thrust iii. Pressure iv. Mass
A block of volume 3 x 10 5 m 3 and density 2.5 x 10 3 kg m -3 is suspended from a spring balance with \(\frac{2}{3}\) of its volume immersed in a liquid of density 900 kg m -3 . Determine the reading of the spring balance [g = 10ms -2 ]
A solid body will float in a liquid if its
An object is said to undergo oscillatory motion when it moves
A body is rotating in a horizontal circle of radius 2.5m with an angular speed of 5 rad s-1. Calculate the magnitude of the radial acceleration of the body
A moving car of mass 800 kg experiences a frictional force of 200N. If it accelerates 2 ms -2 , calculate the magnitude of the force applied to the car
Uniform speed occurs when there is equal change of
A car accelerates uniformly from rest at 5 ms -2 . Determine its speed after 10s
Which of the following quantities is a vector?
which of the following statements about simple harmonic motion is correct? The
A force acting on a body causes a change in the momentum of a body from 12 kg ms -1 to 16kg ms -1 in 0.25. Calculate the magnitude of the impulse
Which of the following source of energy is renewable?
A stone of mass 2.0kg is thrown vertically upward with a velocity of 20.0 ms -1 , calculate the initial kinetic energy of the stone
Which of the following statements about the mouth piece of a telephone is correct? It converts sound energy into
The potential energy in an elastic string of force constant K which has been extended by X metres is expresses as
The engine of a train produces a force of 3000N when moving at 30.ms -1 . calculate the power of the engine
The velocity ratio of an inclined plane, inclines at an angle \(\theta\) to the horizontal can be expressed as
A block and tackle system has six pulleys. a force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W
The sagging of overhead electrical cables is the consequence of
The silvered surface in a vacuum flask reduces heat loos due to
How long will it take to heat 3kg of water from 28 o C to 88 o C in an electric kettle taking 6a from a 220V supply? [specific heat capacity of water = 4180 J kg -1 K -1 ]
The amount of energy required to change a kilogram of ice in water without a change in temperature is
A quantity of steam at 100 o C condenses to water at the same temperature by releasing 6.9 x 10 4 J of energy. Calculate the mass of the condensed steam. [specific latent heat of vaporization of eater = 2.3 x 10 6 J kg -1 ]
The temperature of a liquid falls after some of it has evaporated because
The S.I units of frequency, period and amplitude of a wave are respectively
a note of frequency 2000Hz has a velocity of 400 ms -1 . calculate the wavelength of the note
The eclipse of the moon occurs when the
Which of the following observations cannot be explained using the rectilinear propagation of light?
The distance between the successive crests of a wave travelling at 20ms\(^{-1}\) is 25cm. Calculate the frequency of the wave
A ray from a fixed object is incident on a plane mirror at an angle of 20 o . If the mirror is rotated through 30 o by how many degree would the reflected ray rotate?
Which of the following distances is usually adjustable in the camera? The distance between the
A travelling microscope is focused on a mark on a table. If a glass block of thickness 18.0cm is placed on the mark by how many centimeters will the microscope be moved upwards so as to focus the mark once again? [refractive index of glass = 1.5]
In which of the following media would sound wave travel fastest?
Which of the following actions is necessary in order to tune a string to produce a note of an octave higher than its fundamental?
The acceleration due o gravity may be defined as the force
An electron of mass m and charge \(\Box\) enters a uniform electric field between two metal plates P and q separated by a distance d. P is maintained at a potential V while Q is earthed. Determine an expression for the magnitude of the acceleration of electron through the field
Which of the following factors does not affect the capacitance of a parallel plate capacitor?
The equivalent capacitance of a 3\(\mu F\) capacitor and a 6\(\mu F\) capacitor connected in parallel is
a cell of e.m.f. 1.5V and internal resistance 1.0\(\Omega\) is connected to two resistor of resistance 2.0\(\Omega\) and 3.0\(\Omega\) in series. Calculate the current through the resistors
An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament
Which of the following statements about a bar magnet is correct?
The force experienced by a current-carrying conductor move in a magnetic field is employed in the working of the i. moving coil ammeter ii. electric bell iii. electric motor. Which of the statements above are correct?
The breaking up of an atomic nucleus into the fragment of nearly equal size is known as
A 500kV is applied across an X-ray tube. Calculate the maximum velocity of the electrons produced [Me = 9.1 x 10\(^{-31}\)kg, e = 1.6 x 10\(^{-19}\)C]
A radioactive substance of mass 768g has a half life of 3 years. After how many years does this substance leave only 6g undecayed?
Fusion is not usually used for generating electric power because
An atom \(^{234}_{91} P\) emits a gamma radiation. The resultant nuclide is
The diagram above shows the speed-time graph of a car.If the car covered a total distance of 600m in 25s, calculate its maximum speed
Determine the magnitude of P in the diagram above