WASSCE PHYSICS MAY/JUNE 2011 (SSCE WAEC MAY/JUNE 2011 PHYSICS))
SSCE MAY/JUNE PHYSICS OBJECTIVE 2011
1. Which of the following statements is not correct?
A. Molecule of ice, water and water vapour have equal intermolecular distances
B. Molecules of ice, water and water vapour do not differ in the structure of their molecules
C. Molecules of water vapour attract each other with fore far less than the forces of attraction between water molecules
D. Water is less compressible than water vapour
2. The density ρ of a spherical ball of diameter d and mass m is given by
A. $\rho =\frac{3m}{4\pi {{d}^{3}}}$
B. $\rho =4\pi m{{d}^{3}}$
C.$\rho =\frac{6m}{\pi {{d}^{3}}}$
D. $\rho =\frac{3m}{2\pi {{d}^{3}}}$
3. A metal rod of density 7000kgm–3and cross-sectional area of 0.001257m2 has a mass of 1.76kg. Calculate its length
A. 0.20m
B. 0.25m
C. 0.40m
D. 0.50m
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4. The pressure in a liquid
A. is the same at all point in the liquid
B. decrease with depth
C. is the same in all direction at a given point
D. is equal to the atmospheric pressure
5. The property of a fluid that is used to determine its suitability as lubricant is its
A. capillarity
B. viscosity
C. surface tension
D. relative density
6. Which of the following graph describes a body that accelerates uniformly with an initial velocity greater than zero?
7. The area under a velocity-time graph represents
A. final velocity attained
B. distance covered
C. acceleration
D. work done
8.In the absence of gravitational force, the weight of a body is
A. its mass
B. zero
C. its density
D. its volume
9. A stone of mass 300g is released from rest from the top of a building of height 100m. Determine the kinetic energy gained by the stone when it is quarter way down from the point of release.
A. 750.0J
B. 225.0J
C. 75.0J
D. 22.5J
10. A body of mass 300g placed at the 10cm mark on a uniform metre rule makes the rule settle horizontally on a fulcrum placed at the 35cm mark. Calculate the mass of the rule
A. 60g
B. 80g
C. 120g
D. 200g
11. Two simple pendula A and B of equal lengths and of mass 5g and 20g respectively are located in the same environment. The periods TA and TB of their respective oscillations are related by the equations
A. TA = 4TB
B. ${{T}_{A}}=\tfrac{1}{4}{{T}_{B}}$
C. TA = TB
D. TA = 5TB
12. An object of mass 5.0kg moves with a velocity of 10ms–1. Calculate its momentum.
A. 50.0kgms–1
B. 15.0kgms–1
C. 2.0kgms–1
D. 0.5kgms–1
13. A coin is pushed from the edge of a laboratory bench with a horizontal velocity of 15.0ms–1. If the height of the bench from the floor is 1.5m. Calculate the distance from the foot of the bench to the point of impact with the floor. (g = 10ms–2)
A. 0.75m
B. 2.25m
C. 8.22m
D. 15.00m
14. Which of the following statement correctly defines a simple machine? A device
A. that can produce electric current
B. which can only carry people from one place to another
C. with which work can be done easily
D. which changes the state of rest of uniform motion of an object
15. The radius of wheel 30.0cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine assuming 100% efficiency
A. 600.00N
B. 40.00N
C. 24.00N
D. 20.0N
16. Which of the following properties is not considered in choosing mercury as a thermometric liquid?
A. Density
B. Expansitivity
C. Conductivity
D. Opacity
17. Hypsometer is used for determining
A. Steam point
B. relative humidity
C. ice point
D. relative density
18. Which of the following statement about anomalous expansion of water is correct?
I. There is a contraction between 0oC and 4oC
II. There is expansion between 0oC and 100oC
III. The volume is minimum at 4oC
IV. The volume is maximum at 4oC
A. I and II only
B. II and III only
C. I and III only
D. II and IV only
19. Which of the following equation show the linear expansitivity (α) and the cubic expansitivity (γ) of a material are related
A. $\gamma =\alpha $
B. $\gamma -1-\alpha $
C. $\gamma =2\alpha $
D. $\gamma =3\alpha $
20. Which of the following assumptions is not valid for an ideal gas?
A. Molecules of a particular gas are identical
B. Molecules moves freely throughout the volume of the container
C. Force of attraction between molecules is negligible
D. Molecules moves at constant speed between collisions
21. A body is pulled over a distance of 500m by a force of 20N. If the power developed is 0.4kW, calculate the time interval during which the force is applied.
A. 0.2s
B. 2.5s
C. 25.0s
D. 250s
22. A metal of mass 200g at a temperature on 100oC is placed in 100g of water at 25oC in a container of negligible heat capacity. If the final steady temperature is 30oC, Calculate the specific heat capacity of the metal.
[Specific heat capacity of water is 4200Jkg–1 K–1]
A. 150 Jkg–1K–1
B. 300 Jkg–1K–1
C. 320 Jkg–1K–1
D. 1960 Jkg–1K–1
23. Ether produces a cooling effect when it is poured on the hand because it has
A. low conductivity
B. high conductivity
C. high latent heat of vaporisation
D. low latent heat of vaporisation
24. Which of the following statement about the image formed by a plane mirror is not correct?
A. It is laterally inverted
B. It has unit magnification
C. It is formed by actual intersection of rays
D. Its distance from the mirror is equal to that of the object from the mirror
25. The image formed by a convex mirror is always
A. real, erect and diminished
B. real, inverted and diminished
C. virtual, inverted and diminished
D. virtual, erect and diminished
26. A ray undergoes a minimum deviation at 40o when it is incident on an equilateral triangular glass prism. Calculate the refractive index of the prism
A. 1.48
B. 1.50
C. 1.53
D. 1.67
27. Total internal reflection occurs in a optical prism when light rays
A. travels from the prism into an optically denser medium
B are incidents in the prism at an angle greater than the critical angle
C. are incident normally in the prism
D. travel from the prism to air
28. The speed of light in a certain medium is V while its speed in vacuum is C. The absolute refractive index of the medium is
A. C+V
B.
C.
D. C – V
29. An object is placed 20.0cm in front of a converging lens of focal length 15.0cm. Calculate its image distance.
A.1.3cm
B. 8.6cm
C. 35.0cm
D. 60.0cm
30. Presbyobia is a defect of eye resulting from
A. weak ciliary muscles
B. short eyeball
C. loss of sphericity of the lens
D. long eyeball
31. The focal length of the eye piece of an astronomical telescope is f1 while the focal length of the objective is f2. For normal adjustment, the angular magnification is given by
A. $\frac{{{f}_{2}}}{{{f}_{1}}}$
B. $1-\frac{{{f}_{2}}}{{{f}_{1}}}$
C. $\frac{{{f}_{1}}}{{{f}_{2}}}-1$
D. $\frac{{{f}_{1}}}{{{f}_{2}}}$
32. Two sound waves have frequencies of 12Hz and 10Hz. Calculate the beat period.
A. 0.5s
B. 1.0s
C. 1.2s
D. 2.0s
33. The main difference between echo and reverberation is that
A. reverberation is reflected sound while echo is refracted sound.
B. the time interval between incident sound and reflected sound is shorter for reverberation.
C. the amplitude of an echo is greater
D. reverberation is from acoustic speaker while echo comes from cliffs
35. The correct relationship between “G” and “g” in a gravitational field is given by the equation (Where the symbols have their usual meanings)
A. $g=\frac{GM}{R}$
B. $g=\frac{GM}{{{R}^{2}}}$
C. $g=\frac{G{{M}^{2}}}{R}$
D. $g=\frac{G{{M}^{2}}}{{{R}^{2}}}$
36. The capacitance of a parallel-plate capacitor
A. decrease when the separation between the plates decreases
B. increases when the potential difference between the plates is increased
C. is greater without dielectric material between the plates
D. is greater with a dielectric between the plates than without a dielectric
37. When the pointer end of an uncharged optical pin is brought near the cap of a positively charged electroscope, it is observed that the gold leaves
A. collapse slowly
B. vibrate
C. are not affected
D. diverge rapidly
Use the circuit diagram below to answer question 38 and 39
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38. Calculate the total charge in the circuit
A. 80µC
B. 35µC
C. 20µC
D. 16µC
39. Calculate the potential difference across the capacitors in parallel
A. 10.0V
B. 8.0V
C. 6.7V
D. 2.0V
40. Which of the following substances does not conduct electricity?
A. Graphite
B. Glass
C. Sulphuric acid
D. Table salt solution
41. The unit of capacitance is
A. Farad
B. Coulomb
C. Henry
D. Ohm
42. An ammeter with a full scale deflection of 10mA has internal resistance 0.5Ω. Calculate the resistance of the shunt required to adapt it to read up to 3A
A. 0.0017Ω
B.0.0130Ω
C. 0.0250Ω
D. 0.1000Ω
43.The resisitivity, ρ, of a material of length l, cross –sectional area A, and resistance R, is given by the equation
A. $\rho =\frac{RA}{l}$
B. $\rho =\frac{l}{RA}$
C. $p=\frac{Rl}{A}$
D. $\rho =\frac{R}{Al}$
44. A wire of length 30cm is moved with a speed of 2ms–1 at right angles to a magnetic field of flux density 0.4T. Calculate the emf induced in the wire.
A. 0.15V
B. 0.24V
C.. 2.70V
D. 24.00V
45. Which of the following practices will lead to losses in electrical power transmission?
A. Using transmission cables of large diameter
B. Transmitting at high voltage and low current
C. Transmitting at relatively low voltage and high current
D. Using a step –up transformer at the production end
46. For photoelectric emission, the threshold frequency is the
A. maximum frequency of incident radiation that will eject electrons
B. minimum frequency of incident radiation required to eject electrons
C. frequency which results in the emission of the greatest number of electrons
D. frequency which impact greatest kinetic energy to emitted electrons.
47. Which of the following properties is not applicable to X-rays, They are
A. travel inn straight lines
B. travel with the speed of light
C. are deflected by magnetic field
D. affect photographic films
48.Uranium -234 disintegrate to form Thorium–230 by emitting
A. alpha particles
B. gamma particles
C. beta negative rays
D. beta positive rays
49. The change in mass of fuel during a nuclear reaction is 2.0 × 10–27kg. Calculate the amount of energy released (3.0×108ms–1)
A. 1.8 ×10–10J
B. 9.0 ×10–11J
C. 6.0 ×10–10J
D. 1.2 ×10–45J
50. Nuclear fusion is not used as a source of energy because
A. very high temperature is needed for the reaction.
B. the fuel for the reaction is not easy to obtain
C. less energy is released
D. the reaction is too slow