WASSCE PHYSICS MAY/JUNE 2002 (SSCE WAEC MAY/JUNE 2002 PHYSICS)
Now answer the following questions
1. One common characteristics of solid, liquid and gases is
A. all the three have fixed volume
B. their molecules have the same size
C. their molecules are always in motion
D. all the three have the same inter molecular forces
2. The force between the molecules of a liquid in contact with that of a solid is
A. adhesive
B. cohesive
C. magnetic
D. repulsive
3. The energy needed to separate the nucleons against the force which hold them together is
A. Nuclear energy
B. mechanical energy
C. ionisation energy
D. binding energy
4. A reservoir is filled with a liquid of density of 2000kgm–3. Calculate the depth at which the pressure in the liquid will be equal to 9100Nm–2 [g = 10ms–2]
A. 0.262m
B. 0.455m
C. 0.664m
D. 0.819m
5. A solid weighs 45N and 15N respectively in air and water. Determine the relative density of the solid
A. 0.33
B. 0.50
C. 1.50
D.3.00
6 . A boy travels 8km eastward to a point B and then 6km northward to another point C. Determine the difference between the magnitude of displacement of the boy and distance travelled by him
A. 2.0km
B. 4.0km
C. 10.0km
D. 14.0km
7. The magnitude of the force required to make an object of mass m move with speed v, in a circular path of radius r, us given by the expression
A. $\frac{mr}{v}$
B.$\frac{m{{r}^{2}}}{v}$
C.$\frac{m{{v}^{2}}}{r}$
D.$\frac{mv}{{{r}^{2}}}$
8. A man was moving round a circular path continuously for 4 minutes and covered the following distances in time state below
|
Distance (in metres) |
200 |
400 |
600 |
800 |
|
Time(in minutes) |
1 |
2 |
3 |
4 |
Which of the following statements is correct about the motion of the man?
A. The man was moving with uniform speed but non-uniform velocity
B. The speed was changing constantly
C. The velocity was uniform
D. it was an instance of motion in which both speed and velocity are the same
9. A car takes off rest and covers a distance of 80m on a straight road in 10s. Calculate the magnitude of its acceleration.
A. 1.25ms–2
B 1.60ms–2
C. 4.00ms–2
D. 8.00ms–2
10.An object is released from rest at a height of 25m . Calculate the time it takes to fall to the ground [g = 10ms–2]
A. 25.00s
B. 10.00s
C. 2.50s
D. 2.24s
11. An object is acted by a system of parallel forces causing the object to be in equilibrium. Which of the following statement is not correct?
A. The resultant of the parallel forces is zero.
B. The algebraic sum of all the moments of the forces is zero
C. All the parallel forces must be equal in magnitude and direction
D. The sum of the forces in one direction must be equal to the sum of the forces in opposite direction
12
An object, A, is held in equilibrium as illustrated in the diagram above. Using the data on the diagram, determine the magnitude, W, of the weight of A
A. 23N
B. 17N
C. 7N
D. 5N
13. A spiral spring of natural length 30.0cm and force constant of 20Nm–1 is compressed to 20.0cm. Calculate the energy stored in the spring
A. 0.1J
B. 1.0J
C. 10.0J
D. 100J
14.
In the diagram above, AB represents a uniform rod of length 1.50m which is at equilibrium on a pivot at P. If AP = 40cm, Calculate the mass of the rod [g =10ms–2]
A. 0.280kg
B. 0.400kg
C. 0.613kg
D. 0.800kg
15. Which of the following statement correctly defines quantitatively, work done by a force? The product of the force and the distance moved by a force
A. Parallel to the line of action of the force from a reference point
B. Perpendicular to the line of the force from a reference point
C. on a line through the reference point
D. by the object
16. A load of mass 120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine.[g =10ms–2]
A. 60W
B. 80W
C. 100W
D. 120W
17. A block and tackle has 6 pulley. If the efficiency of the machine is 60%, determine its mechanical advantage
A. 12.0
B. 10.0
C. 3.6
D. 1.8
18. Which of the following actions will improve the efficiency of a pulley system
A. Reducing the mass of the pulley
B. increasing the frictional force between the string and the pulley
C. Increasing the mass per unit length of the string of the pulley
D. Increasing the mass of the pulley
19. The ice and steam points of a certain thermometer are –20oC and 10oC and the mixture is well stirred. Calculate the temperature of the mixture [Neglect heat loss to the surrounding]
A. 60oC
B. 40oC
C. 25oC
D. 10oC
20. The silver coating on the inside of a vacuum flask reduces heat loss by
A. Conduction
B. Radiation
C. Condensation
D. Convection
21. Water of mass 120g at 50oC is added to 200g of water at 10oC and the mixture is well stirred. Calculate the temperature of the mixture [Neglect heat losses to the surrounding]
A. 60oC
B. 40oC
C. 25oC
D. 10oC
22. Calculate the energy required to vaporise 50g of water initially at 80oC [Specific heat capacity of water =4.2Jg–1K–1, Specific latent heat of vaporisation of water =2260Jg–1]
A. 113,000J
B. 117,200J
C. 234, 400J
D. 420,000J
23. What type of motion dies the skin of a talking drum perform when it is struck with a drum stick?
A. Random
B. Rotational
C. Translational
D. Vibratory
24. spring fixed at one end is placed horizontally on a table. The free end is displaced parallel to the table and then released. The resulting waveform is
A. transverse
B. longitudinal
C. stationary
D. electromagnetic
25A radio has a wavelength of 150cm. If the velocity of radio waves in free space is 3.0×10ms–1. Calculate the frequency of the radio wave
A. 4.5×1010Hz
B. 5.0×109Hz
C. 4.5×109Hz
D. 2.0×108Hz
26. In the wave equation$y={{E}_{0}}\sin (200t-\pi x)$, Eo represents the
A. Amplitude
B. frequency
C. period
D. wavelength
27. The size of the hole of a pin hole camera is increased. The resultant image formed becomes
A. Sharper
B. reduced in size
C. enlarged
D. blurred
28. The refractive index of medium relative to air is 1.8. Calculate, to the nearest degree, the critical angle for the medium
A. 68o
B. 56o
C. 34o
D. 18o
29. A converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens?
A. 10.00cm
B. 6.00cm
C. 5.00cm
D. 1.50cm
30.In a compound microscope, the image formed by the objective lens is at the distance of 3.0cm from the eye lens, if the final image is at 25.0cm from the eye lens. Calculate the focal length of the eye lens
A. 0.3cm
B. 2.7cm
C. 3.4cm
D. 8.3cm
31. A pulse of a sound is transmitted from a ship and the reflection from the seabed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water =1560ms–1]
A. 312.0m
B. 156.0m
C.78.0m
D. 31.2m
32. When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon is called
A. beats
B. diffraction
C. overtones
D. resonance
33. Which of the following instruments is not a wind instrument?
A. Clarinet
B. Saxophone
C. Trumpet
D. Xylophone
34. Which of the following actions will not cause an increase in the frequency of a vibrating string?
A. Increasing the tension in the string
B. Decreasing the mass per unit length of the string
C. Decreasing the length of the string
D. Increasing the cross sectional area of the string
35. Which of the following items can used to compare the relative magnitude of electric charges on two bodies?
A. Ebonite rod
B. Gold leaf electroscope
C. Proof planes
D. The electrophorus
39. Three capacitors each of capacitance 18µF are connected in series. Calculate the effective capacitance of the capacitors
A introducing an oxidizing agent in the acid
B. not drawing current continuously for long periods
C. amalgamating the surface of the zinc plate
D. using porous pot to isolate the zinc from the acid
40. The lead-acid accumulator consist of
A. lead as the positive electrode
B. lead oxide as the negative electrode
C. hydrochloric acid as the electrolyte
D. tetraoxosulphate(VI) acid as the electrolye
41. Which of the following actions will not lead to an increase in the induced e.m.f in a coil of wire rotating between the poles of a magnet? Increasing the
A. strength of the magnet
B. number of turns in the coil
C. speed of rotation of the coil
D. gap between the poles of the magnet
42. A transformer has 400 turns and 200 turns in the primary and secondary windings respectively. If the current in the primary and secondary windings are 3A and 5A respectively, calculate the efficiency of the transformer
A. 85.0%
B. 83.3%
C. 37.5%
D. 30.0%
43. A freely-suspended magnet swinging in a horizontal plane comes to rest with axis pointing approximately
A. north-south
B. south-west
C. north-east
D. south-east
44.
Calculate the inductance, L, of the coil in the circuit diagram shown above
A. 3.8H
B. 0.6H
C. 0.4H
D. 0.2H
45. In a model of the hydrogen atom, the energy levels Wn are given by the formula $Wn=-\frac{R}{{{n}^{2}}}$ . Where n is an integer and R is a constant, Determine the energy released in the transition from n = 3 to n = 2
A.$\frac{R}{5}$
B. $-\frac{R}{4}$
C. $\frac{5R}{36}$
D.$-\frac{5R}{36}$
46. If a radioactive atom emits a beta particle, its mass number
A. increase by one
B. remain the same
C. decrease by one
D. increase by two
47. When light falls on a metallic surface, the number of electrons that may be emitted would be depend solely on the
A. area of metallic surface
B. frequency of the light
C. intensity of the light
D. time of exposure of the metallic to light
48. Which of the following materials is used to control the rate of neutron production in a nuclear reactor?
A. Boron rod
B. Concrete Shield
C. Graphite rods
D. Uranium rods
49.. Which of the following is usually used to control fission in an atomic reactor
A. Alpha particles
B. Beta particles
C. Electrons
D. Neutrons
50 A nuclide X is produced by bombarding nitrogen (N) nucleus with an alpha (α) particle with the release of heavy hydrogen (D) nucleus as shown by the following nuclear equation
$\alpha +_{7}^{14}N\to _{q}^{p}X+_{1}^{2}D$ . Determine the value of p and q in the equation
A. 12 and 6
B. 14 and 7
C. 18 and 8
D. 19 and 6