Two different materials, rubbed against each other acquired opposite charges when separated. This is an example of charging by
Ainduction
Bfriction
Cconduction
Dconvection
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Question 232
waec2016
The p.d across a parallel-plate capacitor is 103V. If the distance between the two plates is 10cm. Calculate the magnitude of the electric field strength between the plates.
A1.0 x 104Vm-1
B1.0 x 105Vm-1
C1.5 x 105Vm-1
D2.0 x 105Vm-1
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Question 233
waec2016
A man and his friend have masses 70kg and 60kg respectively. If they are seated 1.0m apart, calculate the gravitational force of attraction between them. (G = 6.67 x 10-11 Nm2 kg-2)
A1.59 x 10-14 N
B2.80 x 10-7 N
C1.30 x 10-2 N
D6.30 x 1013 N
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Question 234
waec2016
The electricity meters in houses measure energy unit consumed in
Akilowatt-hour
Bvolt
Campere
Dcoulomb
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Question 235
waec2016
An aluminium cable of diameter 4 x 10-3m and resistivity 3.0 x 10-8\(\omega\)m has a resistance of 21\(\Omega\). Calculate the length of the cable. (\(\pi = 3.14\))
A8.0 x 102m
B8.8 x 103m
C8.0 x 104m
D8.8 x 104m
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Question 236
waec2016
An astronomical telescope has objectives and eye-piece lenses of focal length 3.5m and 5cm respectively. Determine the magnifying power of the telescope when in normal adjustment
A70.0
B17.5
C7.0
D0.7
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Question 237
waec2016
The pair of musical instruments that works on the vibration of air in pipes is
Apiano and the organ
Bguitar and the flute
Ctrumpet and the violin
Dflute and the trumpet
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Question 238
waec2016
The diagram given illustrates the waveform of a note produced by vibrations in an air column of length L. If the speed of sound in air is V, derive an expression for the frequency of the notes
A\(\frac{V}{L}\)
B\(\frac{5VL}{2}\)
C\(\frac{5L}{4V}\)
D\(\frac{5V}{4L}\)
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Question 239
waec2016
Complementary colours are those which
Ahave the same refractive index
Bhave the same wavelength
Cadd-up to produce black light
Dadd-up to produce white light
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Question 240
waec2016
Total internal reflection. i. is a phenomenon of refraction of light. ii. occurs when light rays travel into a denser medium. iii. occurs when the critical angle is just exceeded. iv. is a phenomenon of reflection of light. Which of the statements above are correct?
Ai and ii only
Bi and iii only
Ci, ii and iii only
Di, iii and iv only
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Question 241
waec2016
The image formed by a concave mirror is real, inverted and magnified, when object is placed
Aat the focus
Bat the centre of curvature
Cbeyond the centre of curvature
Dbetween the centre of curvature and the focus
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Question 242
waec2016
X-rays and infrared rays are both electromagnetic. Which common property do the waves have? Both waves
Aare longitudinal
Bhave same frequency
Chave the same wavelength
Dtravel at the same speed in a vacuum
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Question 243
waec2016
The distance between two successive trough of a wave is 0.4m. If the frequency of the source is 825Hz, Calculate the speed of the wave
A165.0 ms-1
B330.0ms-1
C41.5ms-1
D85.0ms-1
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Question 244
waec2016
Given that v, f and \(\lambda\) are the velocity, frequency and wavelength of a wave respectively. Which of the following equations is correct?
Av = f2\(\lambda\)
Bf = \(\frac{v}{\lambda}\)
Cf = \(\frac{v}{\lambda^2}\)
D\(\lambda = \frac{f}{v^2}\)
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Question 245
waec2016
A pressurized perfume bottle is left on the window pane of a room. What happens to he gas molecules of the perfume on a sunny day? They
Aexpand
Bcollide less often
Cmove more rapidly
Dcontract
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Question 246
waec2016
Which of the following statements is correct about the effect of dissolved salt on the freezing point of water?
Athe freezing point is lowered
Bthe freezing point is increased
Cthere is no change in the freezing point
Dthe change in the freezing point depends on the temperature of the surrounding
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Question 247
waec2016
The continuous stirring in the method of mixtures to determine the specific thermal capacity of a substance ensures
Acontinuous dissipation of heat to the room
Buniform distribution of thermal energy to all parts of the mixture
Cthat the thermal energy is confined to the mixture
Dthat there is rapid heat exchange
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Question 248
waec2016
A mercury-in-glass thermometer read 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm
A13oC
B20oC
C33oC
D38oC
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Question 249
waec2016
An aluminium rod of length 1.8m at 10°C is heated to proceed produce a difference in length of 0.007m. Calculate the temperature to which it is heated. (Linear expansivity of aluminium = 2.3 x 10\(^{-5}\)K\(^{-1}\)
