WAEC - Physics (2013)

1
The rising of a liquid in an open and ended glass tube of narrow bore is
Svare
(C)
capillarity
2
Which of the following units is equivalent to the watt?
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(B)
kgm²s^-3
3
Which of the following statements about pressure in a liquid is correct?
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(A)
the pressure in a liquid increases with depth
4
Solid friction, like viscosity is
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(D)
in opposition to motion
5
The slope of a linear distance-times graph represents
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(C)
speed
6
A body of mass 2kg is released from rest on a plane inclined at an angle of 60° to the horizontal. Calculate the acceleration of the body down the plane.[g = 10ms\(^{-2}\)]
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(D)
8.7ms^-2
7
The total area under a force-velocity graph represents
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(C)
power
8
A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms\(^{-2}\)]. Calculate the speed of projection
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(C)
12.0ms^-1
9
A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms^-2]. Determine the potential energy of the body at the maximum height of its motion
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(A)
0.36J
10
The maximum displacement on either side of the equilibrium position of an object in simple harmonic motion represents
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(B)
amplitude
11
From Newton's first law of motion,
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(C)
the net force acting in uniform linear motion is zero
12
A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x \(10^10Nm^{-2}\), g = 10m\(s^{-2}\), \(\pi\) = 3.142]`
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(B)
5.5 x 10^-2J
13
The velocity ratio of an inclined plane
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(B)
increases with decrease in the angle of inclination
14
Which of the following types of thermometer is used for the calibration of other thermometers?
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(B)
constant volume gas thermometer
15
The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?
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(A)
i and ii only
16
Highly polished silvery surfaces are
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(B)
poor absorbers and good emitters of radiation
17
The volume of a given mass of gas at 27^oC and 800 mmHg is 76cm². Calculate its volume at s.t.p
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(B)
72.8 cm³
18
Ice of mass 10g at 5°C was completely converted to water at 0°C, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 336 Jg\(^{-1}\)]
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(C)
3465J
19
An electric heater has a resistance of 50\(\Omega\). When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings
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(D)
96000J
20
When salt is dissolved in water, the freezing point of the water
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(B)
decreases
21
The equation of a certain progressive transverse wave is y = 2 sin 2 \(\pi ( \frac{t}{0.01} - \frac{x}{30})\), where x and y are in cm and t in seconds. Calculate the period of the wave.
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(B)
0.010s
22
At which position should an object be placed in front of a concave mirror in order to obtain an image which is of the same size as the object?
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(A)
at the centre of curvature
23
Images formed by a convex mirror are always
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(B)
behind the mirror
24
The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface
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(D)
42^o
25
A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance
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(B)
12cm
26
Which of the following statements about the Galilean telescope is not correct?
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(A)
the final image is inverted
27
Which of the following radiations has it's frequency lower than that of infrared radiation?
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(D)
radio waves
28
A string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled.
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(C)
28Hz
29
Which of the following statements about waves in pipes is correct?
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(C)
only odd harmonics are possible in closed pipes
30
When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?
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(A)
negative charges flows to the ground through the person's body
31
A charge of 2.0 x 10\(^{-5}\) C experiences a force of 80N in a uniform electric field. Calculate the magnitude of the electric field intensity
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(B)
4.0 x 10⁶ NC^-1
32
A potential difference of 12V is applied across the ends of a 6\(\Omega\) resistor for 10 minutes. Determine the quantity of heat generated
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(C)
14400J
33
Which of the following instruments is used to determine the accurate value of the electromotive force of a cell?
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(D)
potentiometer
34
The capacitance of parallel plates capacitors varies
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(C)
inversely as the distance between the plates
35
Which of the following devices does not makes use of eddy current for its action? A/An
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(D)
induction coil.
36
A coil of inductance 0.12 H and resistance 4\(\Omega\), is connected across a 240V, 50Hz supply. Calculate the current through it. [\(\pi\) = 3.142]
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(A)
6.3A
37
The work function of a metal is 2.56 x 10^-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10^-19J, h = 6.6 x 10^-34Js]
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(C)
1.12 x 10¹⁵Hz
38
The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called
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(C)
work function
39
Which of the following particles are termed nucleons in a neutral atom?
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(A)
protons and neutrons
40
Which of the following statements about the use of radioisotopes is not correct? They are used to
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(A)
induce mutations in plants and animals to obtain new and improved varieties
41
Which of the following phenomena supports the theory that waves have a particle nature?
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(B)
photoelectric effect
42

A block of wood of mass 5kg is pulled on a platform by a force of 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the acceleration of the block
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(B)
5.6ms^-2
43
Four co-planar forces of magnitudes 10N, 17N, 6N and 20N act at point O as shown in the above diagram. Determine the magnitude of the resultant force
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(D)
5.0N
44

The outlet of a bicycle pump is used to inflate a football as illustrated in the diagram above. Why does the pressure of the air inside the pump increases as the pump handle is slowly pushed downward at constant temperature?
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(C)
frequency of collision of the air molecules with the walls of the pump is increased
45
The diagram above illustrates a waveform. Which of the point on the waveform are in phase?
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(D)
Q and S