Physics — 2005
WASSCE · 50 questions · Answers included
50 questions
Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules?
Each of the following physical quantities is classified as a vector or a scalar quantity. Which of the classifications is correct?
Which of the following statements about a spring balance and/or a chemical balance is not correct?
The friction which exists between two layers of liquid in relative motion is called
A body of mass 25kg, moving at 3ms-1 on a rough horizontal floor, is at rest after sliding through a distance of 2.50m on the floor. Calculate the coefficient of sliding friction. [g = 10.0ms\(^{-2}\)]
Which of the following simple machines is a second class lever?
A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine
Masses,m 1 and m 2 at the 20-cm and 65-cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m 2 : m 1
Which of the following type of motion does a body undergo when acted upon by a couple?V
A body starts from rest and accelerates uniformly at 5ms^-2 until it attains a velocity of 25ms-1. Calculate the time taken to attain this velocity
The frequency of a swinging pendulum is the
Which of the following about an object performing simple harmonic motion is correct? Its acceleration
A body of mass 5kg moving with a velocity of 10ms -1 collides with a stationary body of mass 6kg. If the two bodies stick together and move in the same direction after their collision, calculate their common velocity
Fuel was consumed at a steady rate of 5.0 x 10 -2 kg per second in a rocket engine and ejected as a gas with a speed of 4 x 10 3 ms -1 . Determine the thrust on the rocket
Which of the following quantities has the same unit as energy?
Which of the following source of energy is renewable?
The lower and upper fixed point of a thermometer are 30mm and 180mm respectively. Calculate the temperature in degrees Celsius when the thermometer reads 45mm
A body of mass m, has a specific heat capacity s, and a heat capacity c. If the temperature of the body changes by \(\theta^oC\), Which of the following equation is correct?
An immersion heater rated 400W, 220V is used to heat a liquid of mass 0.5kg. If the temperature of the liquid increases uniformly at the rate of 2.5 o C per second, calculate the specific heat capacity of the liquid. [Assume no heat is lost]
Water falls through a height of 50m. Determine the temperature rise at the bottom of the fall. [Neglect energy losses. Specific heat capacity of water = 4200Jkg -1 K -1 , g = 10ms 2 ]
The energy required to change a solid to liquid at constant temperature is called
Which of the following statements about boiling and evaporation at atmospheric pressure is correct?
Which of the following statements is correct?
The pressure exerted by a given mass of gas in a container
Which of the following statements about a progressive mechanical wave is correct?
The distance between two points in phase on a progressive wave is 5cm. If the sped of the wave is 0.2ms -1 , calculate its period
Radio waves travel in air at 3.0 x 10 8 ms -1 . If the waves enter water of refractive index \(\frac{4}{3}\), calculate the speed of radio waves in water
The amplitude of a wave is the
Which of the following optical instruments does not depend on the use of plane mirrors?
A ray of light is incident normally on a plan mirror. If the incident ray is kept fixed while the mirror is rotated through an angle of 30 o , determine the initial and final angles of reflection respectively
In which of the following media is the transmission of sound wave fastest?
The ability of a material to store an electric charge when its plates are at different potentials is referred to as its
Two capacitors if capacitance 0.4\(\mu F\) and 0.5\(\mu F\) are connected in parallel and charged to a p.d. of 50V, Determine the total charge acquired
A parallel plate capacitor of capacitance 600\(\mu F\) has a potential difference of 200V between its plates. Calculate the charge on either plate of the capacitor
A parallel plate capacitor of capacitance 600\(\mu F\) has a potential difference of 200V between its plates. Calculate the charge on either plate of the capacitor
a chemical cell of internal resistance 1\(\Omega\) supplies electric current to an external resistor of resistance 3\(\Omega\). Calculate the efficiency of the cell
An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?
Which of the following statements explains lost volt in an electric circuit? The
A constantan wire has a cross sectional area of 4 x 10 -8 m 2 and a resistivity of 1.1 x 10 -6 \(\Omega\)m. If a resistor of resistance 11\(\Omega\) is to be made from this wire, calculate the length of the wire required
The mass and weight of a body on earth are 8kg and 80N respectively. Determine the mass and weight of the body respectively on a planet where the pull of gravity is \(\frac{1}{8}\) that on earth
Lenz's law of electromagnetic induction states that
A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when
an electric motor is a machine that converts
Which of the following statements is an advantage of nuclear fusion over nuclear fission?
Which of the following statements is not a reason for using soft iron in making the core of a transformer? It
Beta particles are faster-moving
A process by which two light atoms join to form a new atom of higher atomic mass is
Light of energy 5.0 eV falls on a metal of work function 3.0 eV and electrons are emitted, determine the stopping potential. [electronic charge, e = 1.60 x 10 8 ms -19 ]
The mass of a proton is 1.0089\(\mu\) and that of a neutron is 1.0089\(\mu\). Determine the energy evolved in stabilizing the nucleus of nitrogen of mass number 14 with 7 protons and 7 neutrons. [speed of light = 3.0 x 10 8 ms -1 ; 1\(\mu\) = 1.67 x 10 -27 kg]
Uranium of atom number 92 and mass number 238 emits an alpha particle from its nucleus. The new nucleus formed has respectively, atomic number and mass number