WASSCE PHYSICS MAY/JUNE 2014 (SSCE WAEC MAY/JUNE 2014 PHYSICS)
1. A ball falling through a viscous liquid is acted upon by
A. upthrust only
B. upthrust and the ball’s weight
C. the ball’s weight and viscous force
D. upthrust, the ball’s weight and viscous force
2. An object of mass m moves with a uniform speed v round a circular path of radius r. If its angular speed is ω, the magnitude of the centripetal force acting on it is
A$m{{\omega }^{2}}r$
B. $\frac{m{{v}^{2}}}{r}$
C.$m\omega r$
D. $\frac{m{{v}^{2}}}{r}$
3. When an elastic material is stretched by a force, the energy stored in it is
A. kinetic
B. potential
C. thermal
D. electrical
4. If no net force acts on an object maintains a state if rest or constant speed in a straight kube. The above is a statement of Newton’s
A. First law of motion
B Second law of motion
C. Third law if motion
D. Law of universal gravitation
5. which of the velocity- time graph below correctly describes the motion of a body pulled by a force that is
A.
6. Which the linear momentum of a body is constant, the net force acting on it
A. is zero
B. increases
C. decreases
D. remain constant
7. Which of the following pairs of physical quantities is made up of vectors?
A. Speed and displacement
B. Mass and force
C. Displacement and acceleration
D. Momentum and length
8. The knowledge of surface tension is applied in the following areas except in
A. manufacturing of rain coats
B. production of palm oil
C. floating of a needle on water
D. Washing of plates with soapy water
9. A body is projected vertically upwards with a speed of 10ms–1 from a point 2m above the ground. Calculate the total time for the body to reach the ground. [g =10ms–2]
A. 1.00s
B. 2.00s
C. 2.18s
D.3.00s
10. A car starts from rest covers a distance of 40m in 10s. Calculate the magnitude of its acceleration.
A. 0.25ms–2
B. 0.80 ms–2
C. 3.20 ms–2
D. 4.00 ms–2
11. The diagram above illustrate a uniform metre rule which is balanced on a pivot by some masses. Calculate the value of M
12. A period of a simple pendulum X is 5s. What is the period of a simple pendulum Y which makes 50 vibrations in the same time it takes X to make 20 vibrations?
A. 12.5s
B. 2.5s
C. 2.0s
D. 1.2s
13. Alcohol of mass 21g and density 0.7gcm–3is mxed wit 10g of water. Determine the density of the mixture.
[Density of water = 1.0gcm–3]
A. 0.775 gcm–3
B. 0.780 gcm–3
C. 0.875 gcm–3
D. 0.880 gcm–3
14. A device that converts mechanical energy into electrical energy is
A. a dynamo
B. an electric motor
C. an inductor coil
D. a transformer
15. The SI unit of power is
A. N
B. Pa
C. W
D. J
16. A screw-jack has the distance between its successive thread as P and the length of its tommy bar as r. Its velocity ratio is given by the expression
A.$\frac{2\pi {{r}^{2}}}{P}$
B. $\frac{2\pi r}{P}$
C. $\frac{2\pi }{rP}$
D. $\frac{P}{2\pi r}$
17. Heat transfer by conduction is similar to wave motion because
A. there is increase in temperature
B. transfer of material is involved
C. charged particles vibrate at right angles
D. no charged particles vibrate at right angles
18. The temperature at which water vapour in the air saturates the air and begin to condense is known as
A. dew point
B, critical point
C. boiling point
D. triple point.
19. The change of state from solid to liquid occurs
A. at constant temperature
B. when temperature is lower than the boiling point
C. when temperature is just near freezing point
D. when temperature is equal to the boiling point
20. Which of the following types of thermometers can be used to measure a range of temperature from –5oC to 50oC
I. Clinical
II. Mercury-in-glass
III. Alcohol-in-glass
A. I only
B. II only
C. III only
D I and II only
21. A body of mass M kg rests on a plane inclined at an angle θ to the horizontal. The component of the weight of the body parallel to the plane is
A. 
B. 
C. 
D. 
22. A quantity of water at 20oC is mixed with another quantity of water at 70oC. The final steady temperature of the mixture is 40oC. Determine the ratio of the mass of the cold water to that of the hot water.
A. 7:2
B. 3:2
C.2:5
D. 1:2
23.The mass of an empty density bottle is 50g. When filled with a liquid, the mass of the bottle and the liquid is 40g. On heating the filled bottle through 40oC, the mass reduces to 38g. Calculate the apparent cubic expansitivity of the liquid.
A. 6.25 × 10K–1
B. 6.25× 10-3 K–1
C. 2.50 × 10-3 K–1
D. 2.50 × 10-4 K–1
24. A car travelling at 30ms–1 overcomes a frictional resistance of 100N while moving.Calculate the power developed by the engine [1hp =0.75kW]
A. 0.23 hp
B. 0.40 hp
C. 4.00 hp
D. 4.40 hp
25. The quality of a note depends on its
A. frequency
B. pitch
C. overtones
D. amplitude
26. A transverse wave can be distinguished from a longitudinal waves by
A. diffraction
B. reflection
C. refraction
D. polarization
27. The superposition of waves to produce a maximum or zero effect at a point is known as
A. reflection
B. refraction
C. interference
D. diffraction
28. Refraction of light differs from reflection in that, in refraction
I at least two media are involved
II. there is a change in the direction of the ray
III. the speed of the ray changes
Which of the statement (s) above is are correct?
A. I only
B. I and II only
C.II and III only
D. I and III only
29. Which of the following relations about the focal length fo of the objective and focal length fc of the compound microscope is correct?
A. ${{f}_{o}}={{f}_{c}}$
B. ${{f}_{o}}<{{f}_{c}}$
C. ${{f}_{o}}>{{f}_{c}}$
D.${{f}_{c}}=2{{f}_{o}}$
30. The functional difference between a lens and a mirror is that a lens
A. reflects a beam of light while mirror refracts it
B. refracts a beam of light while a mirror reflects it
C. absorbs incidents rays while transmits them
D. transmits incidents rays while a mirror absorbs them
31.
The diagram above illustrates an electromagnetic wave travelling with speed of 3.00× 108ms–1. Calculate the wavelength of the wave
A. 0.05m
B. 0.15m
C. 0.16m
D. 0.40m
32. An observer hears an echo 1.26seconds after blowing a whistle near a cliff . Calculate the distance of the observer from the cliff [Speed of the sound in air = 330ms–1]
A. 104.0m
B. 207.9m
C. 415.8m
D. 523.8m
33. A fish inside a pond appears to be at a depth of 1.5m when viewed vertically from above. The refractive index of the water in the pond is 1.3. Calculate the apparent displacement of the fish.
A. 2.50m
B. 1.95m
C. 1.50m
D. 0.45m
34. An object is placed in front of two plane mirrors inclined at 60o to each other. Determine the number of images formed
A. 2
B. 3
C. 5
D. 7
35. An ammeter can be adapted to measure potential difference by using a
A. Shunt
B. Multiplier
C. Rheostat
D. Resistance box
36. The region around a magnet in which magnetic force can be experienced is known as
A. declination
B. flux density
C. field
D. flux
37. In an a.c. circuit, when the supply voltage frequency is equal to the resonant frequency, the current
A. leads the supply voltage by 90o
B. lags behind the supply voltage by 90o
C. leads the supply voltage by 45o
D. is in phase with the supply voltage
38. The energy stored in a simple cell is
A. electrical
B. nuclear
C. thermal
D. Chemical
39. Which of the following conditions occurs at resonance in a series RLC circuit?
I. Impedance equal resistance
II. Current is maximum
III. Reactances are maximum
IV. Current and Voltage are 90o out of phase
A. I and II only
B. I and III only
C.I, II and III only
40. An electronic motor converts
A. electrical energy to mechanical energy
B. Mechanical energy to electrical energy
C. Mechanical energy to sound energy
D. Electrical energy to thermal energy
41.A. 15µF capacitor is connected to a 240V, 50Hz a.c. source . Calculate the reactance of the capacitor [π = 3.142]
A. 16Ω
B. 68Ω
C.106Ω
D. 212Ω
42. Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N. Calculate the value of each charge [(4πεo)–1= 9 ×109Nm2C2 ]
A. 2.1µC
B. 3.6µC
C. 4.0µC
D. 4.4µC
43.
In the circuit diagram above, E is a battery of negative negligible internal resistance. IF its emf is 9.0V, calculate the current in the circuit.
A. 1.8A
B. 1.0A
C. 0.8A
D. 0.3A
44. A wire of length 100cm has a resistance of 100Ω. If its cross sectional area is 0.005cm2, determine its resistivity.
A. 0.0005 Ωcm
B. 0.0015 Ωcm
C. 0.0016 Ωcm
D. 0.00700 Ωcm
45. A transformer has 400 turns of wire in the primary coil and 40 turns in the secondary coil. If the input voltage is 150volt, calculate the magnitude of the output voltage.
A. 150V
B. 55V
C. 36V
D. 15V
46
The circuit above illustrates a standard resistor R, voltage source E and a lamp L connected in series. If the temperature of R is increased, the brightness of the lamp will
A. Increases sharply
B. decrease slightly
C. remain the same
D. increase gradually
47. The energy required to separate the nucleus in an atom completely is known as
A. mass defect of the atom
B. electron binding energy
C. excitation energy
D. nuclear binding energy
48. Which of the following statement is the major advantage of nuclear over nuclear fission?
A. Nuclear fusion releases more energy
B. More neutrons are released in fusion than in fusion
C. Fusion does not release as much dangerous radiation as fission
D. Fusion reaction occur more readily than fission
49. An aluminium foil is placed across a beam of radiation from a radioactive source. Which of the following types of radiation will be stopped by it.
A. Alpha and beta particle
B. Alpha and gamma particles
C. Beta and gamma particles
D. Gamma particles only
50. An element of nucleon number P and atomic number Q emits an alpha particle from its nucleus. The resultant number of the new element formed are respectively
A. P – 4 and Q + 2
B. P – 4 and Q – 2
C.P +2 and Q +2
D. P+2 and Q – 2