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 12
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 13
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 14
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 15
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 16
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 17
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 18
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 19
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 20
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\(^{-1}\)
A155oC
B160oC
C169oC
D179oC
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Question 21
waec2016
The diagram given is used to determine the
Aboiling point of water
Batmospheric pressure
Cupper fixed point of a thermometer
Damount of water in the atmosphere
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Question 22
waec2016
Which of the following statements correctly defines the boiling point of a liquid? The temperature at which the
Asaturated vapour pressure equals the atmospheric pressure
Bmolecules leaves the liquid at a rate equal to the rate at which they return
Cmolecules leave the liquid at a rate higher than that at which they return
Dmolecules leave the liquid at a rate lower than the rate at which they return
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Question 23
waec2016
In the clinical thermometer, the function of the kink is to i. Prevent the back flow of mercury after use. ii. Ensure the back flow of mercury after use. iii. Maintain the thermometric property of mercury. iv. Allow the temperature attained to be read.
Ai only
Bi and ii only
Ci and iv only
Diii and iv only
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Question 24
waec2016
The mouth piece of a telephone handset converts
Aelectrical energy to sound energy
Bsound energy to electrical energy
Csound energy to radiowave
Dradiowave to sound energy
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Question 25
waec2016
Resonance occurs when one vibrating object causes a second object to vibrate at its own natural
Aamplitude
Bspeed
Cfrequency
Dintensity
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Question 26
waec2016
When a body is thrown vertically upwards, its velocity at the maximum height is
Amaximium
Bzero
Cdouble its initial value
Dhalf its initial value
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Question 27
waec2016
A plank is placed along the path on which a wheel barrow containing sand is pushed at a construction site to prevent it from sticking as illustrated in the diagram given. The large area of the plank prevents the wheel barrow from getting stuck by
Aincreasing the reaction on the ground
Bincreasing the pressure on the ground
Cdecreasing the pressure on the ground
Ddecreasing the weight on the ground
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Question 28
waec2016
A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by suspending a mass of 120g at the 10cm mark. Calculate the mass of the metre rule.
A60g
B80g
C120g
D200g
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Question 29
waec2016
At a birthday party, the celebrant pops a corked fruit wine. If the cork shoots out of the bottle at an angle of 40o to the horizontal and travels a horizontal distance of 4.50m in 1.25s. Calculate the initial speed of the cork.
A4.2ms-1
B4.7ms-1
C5.6ms-1
D7.1ms-1
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Question 30
waec2016
The two person of a body undergoing a uniformly accelerated motion are (10s, 10ms-1) and (30s, 50ms-1). On the velocity-time graph pf the body.
