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 242
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 243
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 244
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 245
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 246
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 247
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 248
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 249
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.
A0.5ms-2
B2.0ms-2
C10.0ms-2
D40.0ms-2
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Question 250
waec2016
The diagram given illustrates a force-distance graph for the motion of a wooden block. Determine the work done on the block when moved through a distance of 5m.
A4J
B15J
C5J
D100J
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Question 251
waec2016
An object of volume 400cm3 and 2.5gcm-3 is suspended from a spring balance with half its volume immersed in water. Determine the reading on the spring balance. (Density of water = 1gcm-3)
A1200g
B1000g
C800g
D400g
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Question 252
waec2016
Which of the following substances lowers the surface tension of water?
Ametal
Bsand
Cdetergent
Dpaper
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Question 253
waec2016
A ball is dropped from the top of a tower. Due to air resistance,it reaches terminal velocity. Which of the following statement(s) about its motion is/are correct? i. The acceleration of the ball is zero. ii. The net force on the ball is zero. iii. The velocity of the ball increases.
Ai only
Bi and ii only
Cii and iii only
Di, ii and iii
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Question 254
waec2016
The diagram given, represents the graph of stress against strain for an elastic wire. The point Q on the graph is the
Aelastic linit
Bbreaking point
Cyield point
Dproportional limit
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Question 255
waec2016
A student measures the volume of a liquid using a measuring cylinder. What else needs to be measured by the student in order to determine the density of the liquid?
Adepth of the liquid in the cylinder
Bmass of the cylinder
Cmass of the liquid
Dtempersture of the liquid
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Question 256
waec2016
The dimensions of momentum are
AMLT
BML-1T-1
CMLT-1
DML-1T
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Question 257
waec2015
Two angles of a pentagon are in the ratio 2:3. The others are 60o each. Calculate the smaller of the two angles
A72o
B100o
C120o
D144o
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Question 258
waec2015
\(^{226}_{88}Ra\) emits two alpha particles to produce polonium(po) nuclide. The correct formula for the nuclide?
A\(^{224}_{86}po\)
B\(^{222}_{86}po\)
C\(^{222}_{84}po\)
D\(^{218}_{84}po\)
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Question 259
waec2015
Which of the following radiations constitutes a stream of electrons?
ARamma rays
BX-rays
CCathode rays
DRadio waves
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Question 260
waec2015
Which of the following statements about diode is correct?
