WASSCE PHYSICS MAY/JUNE 2008 (SSCE WAEC MAY/JUNE 2008 PHYSICS))
1.If the air inside a rigid box is heated, the
I. average speed of the molecules increases
II. pressure of the air increases
III. Average separation of the molecules increases
Which of the statement above are correct?
A. I and II only
B. II and III only
C. I and III only
D. I, II and III
2. Which of the following sets of quantities is a fundamental?
A. Length, mass and time
B. Speed, length and time
C. Speed, mass and distance
D. Distance, speed and time
3. The diagram above illustrates a Hare’s apparatus e1, e2 represent densities and h1, h2 height of columns of liquids. Which of the following equation is correct?
A.${{h}_{1}}=\frac{{{h}_{2}}{{e}_{1}}}{{{e}_{2}}}$
B. ${{h}_{1}}=\frac{{{h}_{2}}{{e}_{2}}}{{{e}_{1}}}$
C. ${{h}_{1}}=\frac{{{e}_{1}}{{e}_{2}}}{{{h}_{2}}}$
D. ${{h}_{1}}=\frac{{{e}_{1}}}{{{h}_{2}}{{e}_{2}}}$
4. Which of the following statements about Archimedes principle is correct? The upthrust on a body is a measure of the
A. mass of fluid displaced
B. weight of the body
C. volume of the body
D. weight of the fluid displaced
5. Which of the following is/are in random motion?
I. Pollen grain in water
II. The molecules of hydrogen gas
III. Fine chalk particles
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
6. A car travelling with a uniform velocity of 30ms–1 along a horizontal road overcomes a constant frictional force of 600N. Calculate the power of the engine of the car
A. 18KW
B. 20KW
C. 180KW
D. 200KW
7. A rectangular block of dimensions 2.0m ×1.0m × 0.5m weighs 200N. Calculate the maximum pressure exerted by the block on a horizontal floor.
A.100Nm–2
B. 200Nm–2
C. 300Nm–2
D. 400Nm–2
8.
The diagram above represents the displacement – time graph of the motion of an object thrown upwards. The velocity of the object at the point P is
A. Maximum
B. Uniform
C. zero
D. terminal
9. A very sensitive spring balance was used to determine the weight of an object at the North Pole. When the same spring balance was used to measure the weight of the same object at the equator, it was found to reduce. The explanation for this observation is that
A. It is very hot at the equator
B. the spring balance has expanded
C. the acceleration of free fall due to gravity varies with location
D. the mass of the body is reduced
10. A ship moving northward with speed Vs is acted upon by a wind blowing due west Vw. Which of the following diagrams correctly indicates the velocity VR of the wind relative to the ship.
11.
The diagram above shows three force F1, F2, and F3 which keep the bar AB in horizontal equilibrium. Which of the following equation is correct?
A. ${{F}_{3}}={{F}_{1}}-{{F}_{2}}$
B.${{F}_{2}}={{F}_{1}}+{{F}_{3}}$
C.${{F}_{1}}={{F}_{2}}-{{F}_{3}}$
D.${{F}_{1}}={{F}_{2}}+{{F}_{3}}$
12. A mass attached to a string is moving in a circular path. If the speed doubled, the tension in the string will be
A. doubled
B. halved
C. four time as great
D. one fourth as much
13. An object of mass 2kg moving with a velocity of 3ms–1collides head – on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms–1. If the objects stick together after collision, calculate their common speed.
A. 0.60ms–1
B. 0.67ms–1
C. 2.00ms–1
D. 3.33ms–1
14. Which of the following devices converts heat energy to electrical energy?
A. Transformer
B. Dynamo
C. Thermocouple
D. Thermostat
15. A ball is dropped and it hits the floor at a point A. It rebounds upwards to a points B. While moving from A to B its
A. kinetic energy is increasing
B. potential energy is increasing
C. potential energy is decreasing
D. kinetic energy remains constant
16. An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms–1. If its mechanical energy at this height is 12J. Determine the value of h [g = 10ms–1]
A. 0.8m
B. 4.0m
C. 4.8m
D. 5.6m
17. Which of the following equations for the efficiency of a machine is correct?
A. $Efficiency=\frac{velocity\text{ }Ratio}{Mechanical\text{ }Advantage}\times 100%$
B. $Efficiency=\frac{Input}{Output}\times 100%$
C.$Efficiency=\frac{Load distance}{Effort distance}\times 100%$
D. $Efficiency=\frac{Mechanical\text{ }Advantage}{Velocity\text{ }Ratio}\times 100%$
18. The design of the thermostat on an electric iron is based on the
A. emission of electrons from metals when heated
B+. increase in size of metal when heated
C. increase in the density of metal when heated
D. change in the mass of metal when heated
19. A metal rod of length 50cm is heated from 40oC to 80oC. IF the linear expansivity of the material is$\propto $, Calculate the increase of the rod (in metres) in terms of$\propto $
A. 20$\propto $
B. 200$\propto $
C. 2000$\propto $
D. 20000$\propto $
20. The cubic expansitivity of a certain gas at constant pressure $\frac{1}{273{{K}^{-1}}}$ . If the given mass of the gas is held at constant pressure and its volume at 0oC is 273m3. Determine the volume of the gas at 273oC
A. 273m3
B. 546m3
C. 819m3
D. 1092m2
+
21. Water of mass 1.5kg is heated from 30oC to 80oC using an electric kettle which rated 5A, 230V. Calculate the time taken to reach the final temperature
[Specific heat capacity of water = 4200Jkg– 1K–1 ]
A.4.57 minutes
B. 5.02minutes
C. 7.30minutes
D. 10.04 minutes
22. The working principle of a pressure cooker is based on the
A. Increase in the volume of steam inside it
B. Complete trapping of heat inside it
C. Increase in the pressure of the pot
D. decrease in the presence of the pot
23. It takes a shorter time for a liquid to boil at the top of mountain than at the base because at the top, the
A. temperature is higher
B. pressure is lower
C. humidity is higher
D. temperature is constant
24. Light is considered as a transverse wave because it travels
A. through material without causing disturbance of the medium
B. through space with constant speed
C. in a direction parallel to the plane containing the electric and magnetic fields
D. in a direction perpendicular to the plane containing the electric and magnetic fields
25.
The diagram above illustrates the sun, moon and earth in the same straight line during an eclipse. An obs+erver at the point P on earth observes
A. Annular eclipse
B Partial eclipse
C. total eclipse
D. no eclipse
26. The letter F is placed in front of a plain mirror as illustrated in the diagram below
Which of the following represents the image observed
27. In the day time, it is possible to see under shady areas such as under a tree, because light has undergone
A+. internal reflection
B. Refraction
C. Diffraction
D. Diffuse reflection
28. The distance between a concave mirror and an object placed in front of it is 1.0m. If the radius of curvature of the mirror is 4.0m. the image formed will be
A. 2.00m behind the mirror
B. 2.00m in front of the mirror
C. 1.25m in front of the mirror
D. 1.25m behind the mirror
29. The image of an object formed by a convex mirror is
A. real, erect and enlarged
B. real, inverted and enlarged
C. virtual, erect and diminished
D. virtual, erect and enlarged
30. When viewed straight down, a fish in a pond is
A. father below than it appear to be
B. nearer than it appears to be
C. found at exactly the same point it is seen
D. seen beside its image
31. A converging lens and a screen are placed 20cm and 80cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high. Calculate the height of the image formed.
A. 1cm
B. 9cm
C. 12cm
D. 15cm
+
32. Which of the following defects of vision is as a result of the eye ball being to long?
A. long sight
B. Astigmatism
C. Short sight
D. Loss of accommodation
33.A sound wave is produced from a source and echo is heard t seconds afterwards. If d is the distance of the reflecting surface from the
A. $d=\frac{2t}{\lambda }$
B. $d=\frac{\lambda t}{2T}$
C.$d=\frac{2T}{\lambda t}$
D.$d=\frac{\lambda T}{2t}$
34. A negatively charged rod is held close to an uncharged metal ball on an insulating stand. The ball will
A. be negatively charged
B. be positively charged
C. have an excess of negative charges on the side nearest the rod
D. have an excess of positive charge on the side nearest the rod
35. Two bodies each carrying a charge of 2.00×10–10C are 5cm apart. Calculate the magnitude of the force between the charges [$\frac{1}{4\pi {{\varepsilon }_{o}}}=9.00\times {{10}^{9}}N{{m}^{2}}{{C}^{-2}}$ ]
A. 1.44×10–7N
B. 7.20×109N
C.7.20×10–11N
D. 1.44×10–11N
36. If the charge on an object is measured as 4.0×10–18C, how many excess electron does the object possess, given that the charge of an electron is 1.6×10–19C?
A. 18
B. 19
C. 25
D. 37
38. Which of the following is a unit of the time rate of flow of electric charges?
A. Coulomb
B. Ampere
C. Volt
D. Watt
39. Three capacitors each of capacitance 1.5µF are connected in series. The total capacitance in the circuit is.
A. 2.0µF
B. 1.5µF
C. 0.6µF
D. 0.5µF
40. A voltmeter is a device that
A. draw high current
B. has a very low resistance
C. has a very high resistance
D. is able to measure both voltage and current
41Which of the following actions will not increase the sensitivity of a moving coil galvanometer?
A. Using a strong temporary magnet
B. Increasing the area and number of turns of the coil
C. Using a weak hair spring
D. Using a light pointer
42. Fleming’s right hand rule is also called
A. motor’s rule
B. dynamo rule
C. screw rule
D. thumb rule
43. A transformer is required to supply 12Vrms to operate a toy train set from a 240Vrms . If the number of turns in the secondary coil is 100, calculate the number to turns required in the primary coil.
A. 5
B. 12
C. 2000
D. 2400
44.
The diagram, above illustrate a bar magnet near a coil connected to a galvanometer. When the magnet is rapidly moved toward the coil
I. an e.m.f is induced in the coil
II. the galvanometer needle deflects
III. the magnet is attracted by the coil
Which of the statement above are the correct?
A. I and II only
B. II and III only
C. I and III only
D. I, II and III
45. A direct current of 5A flows through a 0.2H inductor. Calculate the energy stored in the inductor
A.0.5J
B. 1.0J
C. 2.5J
D. 5.0J
46. Both @@@@@@ rays and X – rays
I. can be produced by thermionic emission
II. have low frequencies
III. have short wavelengths
Which of the statement abe is/are correct
A. I only
B. II only
C. III only
D. I and III only
47. When a radioactive substance undergoes a beta decay, its
A. mass number decreases by 1
B. atomic number decreases by 1
C. mass number increases by 1
D. atomic number increases by 1
48. Nuclear fission is preferred to nuclear fusion in the generation of energy because
A. very high temperatures are required for fusion
B. the raw material for fusion are easily obtained
C. energy obtained from fusion is relatively smaller
D. the bye-product of fusion are very dangerous
49. Control in nuclear reactors is affected with boron rods because the rods have the ability to
A. absorb electron
B. absorb neutrons
C. accelerate electrons
D. slow down neutrons
50. A radioactive element has decay constant of 0.077s–1
A. 13.0s
B.9.0s
C. 5.1s
D. 05s