WASSCE PHYSICS MAY/JUNE 2000 (SSCE WAEC MAY/JUNE 2000 PHYSICS)
Answer all question
1. When the surface of a piece of chalk is scrapped the tiny particles that flakes off are known as
A. matter
B. molecules
C. elements
D. atoms
2.
The diagram above represents a section of a pair of vernier calliper. The reading on the instrument is
A.5.22cm
B. 5.24cm
C. 5.25cm
D. 5.26cm
3.An iron rod is moved from the earth to the moon. Which of the following properties of the rod would remain unchanged
I. Mass
II. Weight
III. Relative density
A. I only
B. II only
C. III only
D. I and III only
4. A uniforms cylinder hydrometer of mass 20g and cross sectional area 0.54cm2 floats upright in a liquid. If 25cm of its length is submerged. Calculate the relative density of the liquid
[Density of water = 1gcm–3]
A. 1.54
B. 1.48
C. 1.25
D. 0.80
5. An apparent weight of a body wholly immersed in water is 32N and its weight in air 96N . Calculate the volume of the body density[Density of water =1000kg m–3 , g =10ms–2]
A. 8.9×10–3m3
B. 6.4×10–3m3
C.3.2×10–3m3
D. 3.0×10–3m3
6. A wooden block of mass 1.6kg rrest on a rough horizontal surface. If the limiting frictional force between the block and the surface is 8N. Calculate the coefficient of friction [g =10ms–2]
A. 0.6
B. 0.5
C. 0.3
D.0.2
7.A ball bearing is gently released from rest and allowed to fall through a viscous fluid. Which of the following statements about the motion is correct?
A. Its acceleration decreases before terminal velocity
B. When terminal velocity is attained the acceleration of the fluid becomes zero
C. Its velocity increases before terminal velocity is attained
D. There is no resultant force on the ball before it attains terminal velocity
8. The driver of a car moving with a uniform speed of 40ms–1 observes a truck approaching in the opposite direction with a speed of 20ms–1. Calculate the speed of the car relative to that of the truck
A. 0.5ms–1
B.2.0ms–1
C. 20.0ms–1
D. 60.0ms–1
9. A bus travelling at 15ms–1accelerates uniformly at 4ms–1. What is the distance covered in 10s
A. 150m
B. 170m
C. 350m
D. 600m
10. Which of the following sketches represented the velocity time graph of the motion of a stone projected vertically upwards and allowed to returned to the point of projection
11.
The diagram above illustrates three forces T1, T2 and 100N in equilibrium. Determine the magnitude of T1
A. 100 tan 30o
B. $\frac{100}{\cos {{30}^{\circ }}}$
C. 200sin30o
D. $\frac{200}{\tan {{30}^{\circ }}}$
12. A uniform metre of mass 90g is pivoted at the 40cm mark. If the rule is in equilibrium with an unknown mass m placed at the 10cm mark and a 72g mass at the 70cm mark, determine m
A.72g
B. 102g
C. 198g
D. 504g
13. The resultant of two forces acting on an object is maximum when the angle between the is
A. 180o
B. 90o
C. 45o
D. 0o
14. The bob of a simple pendulum takes 0.25s to swing from its equilibrium position to one extreme end. Calculate its period
A. 0.25s
B. 0.50s
C. 0.75s
D. 1.00s
15. The period of oscillation of a particle executing simple harmonic motion is 4π seconds. IF the amplitude of oscillation is 3.0m, calculate the maximum speed of the particle
A. 1.5ms–1
B. 3.0ms–1
C. 4.5ms–1
D.6.0ms–1
16.An inelastic collision takes place between balls of known masses. Just before the collision one of the balls is moving with a known velocity, while the other is stationary. Which of the following physical quantities can be determined from the information given?
A. Speed of each of the balls after collision
B. Kinetic energy of each ball after collision
C. Total momentum of the two balls after collision
D. Mutual forces exerted by the balls
17.
Using the force – displacement diagram shown above, calculate the work done.
A. 2000J
B. 1000J
C. 20J
D. 5J
18. A machine of efficiency 80% is used to raise a body of mass 75kg through a vertical height of 3m in 30s. Calculate the power input [g = 10ms–2]
A. 9.4W
B. 60.0W
C. 75.0W
D. 93.8W
19. Two bodies, P and Q are in thermal equilibrium. Which of the following statement about the bodies is correct?
A. The temperature of Q is higher than that of P
B. P and Q have same heat capacity
C. P and Q have the same mass
D.P and Q are at the same temperature
20. The Cubic expansivity of mercury is 1.8×10–4K–1 and the linear expansivity of glass is
8.0 ×10–4K–1. Calculate the apparent expansivity of mercury in a glass container
A. 1.00×10–4K–1
B. 5.6×10–4K–1
C. 1.72×10–4K–1
C. 2.04×10–4K–1
21. The diagram above shows the variation of volume V of a glass with temperature 0 in a Charles’ law experiment. The value of the temperature at the points x is
A. –32oC
B. –100oC
C. –273oC
D. –373oC
22. The volume and pressure of a given mass of gas at 27oC are 76cm3 and 80cm3 of mercury respectively. Calculate its volume at s.t.p
A. 36.2cm
B.72.8cm
C. 100.0cm
D. 808.9cm
23. A piece of metal of `mass 50g is cooled from 80oC to 20oC.Calculate the amount of heat lost. [Specific heat of capacity of material of metal = 450JKg–1K–1]
A. 4.50×103J
B. 2.25×103J
C. 1.80×103J
D. 1.35×103J
24. The mass of water vapour in a given volume of air is 0.05g at 20oC, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air
A. 3.33%
B. 5.55%
C. 33.33%
D. 55.55%
25. The temperature at which the saturated vapour pressure of liquid is equal to the external atmospheric is known as its
A. dew point
B. boiling point
C. lower fixed point
D. triple point
26. A periodic pulse travels a distance of 20.0m in 1.00s. If its frequency is 2.0×103Hz, Calculate the wavelength
A. 10×10–3m
B. 1.0×10–2m
C. 2.0×10–2m
D. 1.0×10–2m
27. A wave has an amplitude equal to 4.0m, angular speed $\tfrac{1}{3\pi }$rads–1 and a phase angle $\tfrac{2}{3\pi }$ rad. The displacement of y of the wave particle is given as
A. $4\sin \tfrac{\pi }{3}(t+2)$
B. $4\sin \tfrac{\pi }{3}(t+\tfrac{2}{\pi })$
C. $4\sin \tfrac{\pi }{3}(2t+1)$
D. $y=4\sin \tfrac{\pi }{3}(t+2)$
28.
In the diagram above, an incident ray AY makes an angle of 30o with the normal XY. If the mirror is rotated anticlockwise about Y through an angle of 20o, while AY is fixed , what angle will the reflected ray now make with the incident ray
A. 70o
B. 80o
C. 100o
D. 120o
29. A concave mirror can be used to produce a parallel beam of light if a lighted bulb is placed
A. between its focus and pole
B. at its focus
C. at its centre of curvature
D. between its focus and centre of curvature
30. A simple microscope forms an image 10cm from an eye close to the lens. If the object is 6cm from the eye, calculate the focal length of the lens
A. 3.75cm
B. 4.00cm
C. 15.00cm
D. 16.00cm
31. When white light passes through a triangular glass prism, there is dispersion because of
A. diffraction of light
B. polarisation of light
C. the difference in speed of the components of light
D. the interference of light waves in glass
32. In which of the following media does sound travel fastest?
A. Water
B. Brass
C. Air
D. Wood
33. A turning fork of frequency 600Hz is sounded over a closed resonance tube. If the first and second resonant positions are 0.130m and 0.413m respectively, calculate the speed of sound in air.
A. 509.4ms–1
B. 480ms–1
C. 339.6ms–1
D. 169.8ms–1
34. Loudness increase as vibrating tuning fork is brought nearer the end of a pipe containing air column due to
A. resonance
B. echo
C. reverberation
D. diffraction
35. The factor which enables the ear to distinguish between a note played on different instrument is the
A. pitch
B. speed
C. harmonics
D. loudness
36. The object is situated within the Earth’s gravitational field. Which of the following factors does not affect the acceleration of free fall, g?
A. The distance of the object from the centre of the Earth
B. The Latitude of the Earth on which the object is situated
C. The mass of the object
D. The rotation of the Earth
37. The capacitance of a parallel-plate capacitor is increased by making the area of the plates.
A. small and their separation large
B. large and their separation small
C. and their separation small
D. and their separation equal
Use the diagram below to answer Question 38 and 39
38. In the diagram above, the current passing through 6Ω resistor is 1.5A. Calculate the current in the 3 Ω resistor
A. 1.20A
B. 0.90A
C. 0.75A
D. 0.60A
39. Calculate the terminal p.d. of the battery in the diagram
A. 7.50V
B. 9.00V
C. 10.80V
D.11.25V
40. An immersion of heater is rated 120W. How long does it take the heater to raise the temperature of 1.2kg of water by 15oC [ Assume heat loss to the surrounding is negligible, Specific heat capacity of water = 4200JKg–1K–1
A.65.0 minutes
B. 60.0 minutes
C. 52.5 minutes
D. 10.5 minutes
41. The region around a magnet in which the magnetic influence is experienced is called
A. Magnetic flux
B. magnetic field
C. Magnetic meridian
D. Magnetic declination
42.
If a bar magnet is accidentally broken into three pieces as shown in the diagram, the polarities of P and Q respectively are
A. S and S
B. N and S
C. N and N
D. S and N
43. A device used to prevent wearing away of the make-and break contacts of an induction coil is called a/an
A. fuse
B. electroscope
C. resistor
D. capacitor
44. An inductor of inductance 10H carries a current 0.2A. Calculate the energy stored in the inductor.
A. 0.1J
B. 0.2J
C. 1.0J
D. 2.0J
45. Calculate the inductance of an inductor whose reactance is one ohm at 50Hz
A. 2.00×102H
B. 6.36×103H
C. 3.18×103H
D. 4.55×104H
46. Bohr’s theory provides evidence for the
A. structure of the atom
B. positive charge of an electron
C. existence of energy level in the atom
D. positive charge on a proton
47. A nuclide $_{84}^{202}Y$ emits in the succession in α – particle and β – particle. The atomic number of the resulting nuclide is
A. 198
B. 83
C. 82
D. 80
48. The half life of a radioactive substance is 14days. If 48g of this substance is stored, after how many days will 1.5g of the original substance remain?
A. 84days
B. 70days
C. 56days
D. 40days
49.A material of mass 1.0×10–3kg undergoes a fission process which decreases its mass by 0.02 percent. Calculate the amount of energy released in the process [c =3.0 ×10–8ms–1]
A. 1.8×1020J
B. 1.8×1013J
C. 1.8×1011J
D. 1.8×1010J
50. Absorption line spectra exhibited by atoms is a result of
A. change in the Kinetic energy of a moving atom
B. instability of the nucleons
C. excitation of an electron in the atom
D. transition of an electron from a higher to a lower energy level