The distance between two points in phase on a progressive wave is 5cm. If the sped of the wave is 0.2ms-1, calculate its period
A4.00s
B2.50s
C0.25s
D0.04s
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Question 502
waec2005
Which of the following statements about a progressive mechanical wave is correct?
Ait can be a plane polarised
Bits energy is localised at specific points of its profile
Cit does not require a material medium for its propagation
Dits frequency remains constant as it travels between different media
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Question 503
waec2005
The pressure exerted by a given mass of gas in a container
Adecreases if the container is heated
Bincreases if the molecules of the gas move faster
Cincreases if the container is doubled
Ddecreases as the kinetic energy of the gas molecules inceases
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Question 504
waec2005
Which of the following statements is correct?
Athe density of a liquid decreases when it expands
Bthe density of a liquid increases when the liquids are heated
Cthe real expansivity of a liquid is less than its apparent expansivity
Da liquid changes to solid when heated to a sufficiently high temperature
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Question 505
waec2005
Which of the following statements about boiling and evaporation at atmospheric pressure is correct?
Aevaporation and boiling of water take place at 100o
Bevaporation of water takes place at a temperature greater than 100oC, while boiling takes place at 100oC
Cevaporation of water takes place at 100oC while boiling takes place at a higher temperature
Dboiling takes place at 100o while evaporation my take place at temperatures lower than 100oC
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Question 506
waec2005
The energy required to change a solid to liquid at constant temperature is called
Athermal capacity
Bhas lower specific heat capacity
Clatent heat of fusion
Dlatent heat of vaporisation
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Question 507
waec2005
Water falls through a height of 50m. Determine the temperature rise at the bottom of the fall. [Neglect energy losses. Specific heat capacity of water = 4200Jkg-1 K-1, g = 10ms2]
A0.119oC
B0.840oC
C1.190oC
D8.400oC
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Question 508
waec2005
An immersion heater rated 400W, 220V is used to heat a liquid of mass 0.5kg. If the temperature of the liquid increases uniformly at the rate of 2.5oC per second, calculate the specific heat capacity of the liquid. [Assume no heat is lost]
A1100Jkg-1K-1
B320Jkg-1K-1
C200Jkg-1K-1
D176Jkg-1K-1
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Question 509
waec2005
A body of mass m, has a specific heat capacity s, and a heat capacity c. If the temperature of the body changes by \(\theta^oC\), Which of the following equation is correct?
Ams\(\theta\) = mv-1
Bms = C
Cms = s\(\theta\)
Dms = c\(\theta\)
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Question 510
waec2005
The lower and upper fixed point of a thermometer are 30mm and 180mm respectively. Calculate the temperature in degrees Celsius when the thermometer reads 45mm
A10.0oC
B15.0oC
C20.0oC
D30.0oC
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Question 511
waec2005
Which of the following source of energy is renewable?
Asun
Bpetroleum
Ccoal
Duranium
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Question 512
waec2005
Which of the following quantities has the same unit as energy?
Apower
Bwork
Cforce
Dmomentum
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Question 513
waec2005
Fuel was consumed at a steady rate of 5.0 x 10-2kg per second in a rocket engine and ejected as a gas with a speed of 4 x 103ms-1. Determine the thrust on the rocket
A20N
B80N
C200N
D800N
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Question 514
waec2005
A body of mass 5kg moving with a velocity of 10ms-1 collides with a stationary body of mass 6kg. If the two bodies stick together and move in the same direction after their collision, calculate their common velocity
A4.55ms-1
B12.00ms-1
C30.00ms-1
D50.00ms-1
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Question 515
waec2005
Which of the following about an object performing simple harmonic motion is correct? Its acceleration
Ais maximum at the extreme ends
Bis constant and directed towards a fixed point
Cis zero when it is displayed from the equilibrum position
Dvaries linearly with the displacement from a fixed point and is directed towards the fixed point
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Question 516
waec2005
The frequency of a swinging pendulum is the
Anumber of complete oscillations the pendulum makes in a second
Bnumber of amplitudes the bob makes in a second
Cangle the bob swings through in a second
Ddistance the bob covers in a second
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Question 517
waec2005
A body starts from rest and accelerates uniformly at 5ms^-2 until it attains a velocity of 25ms-1. Calculate the time taken to attain this velocity
A2.5s
B5.0s
C10.0s
D125.0s
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Question 518
waec2005
Which of the following type of motion does a body undergo when acted upon by a couple?V
Avibrational
Btranslational
Crotational
Drandom
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Question 519
waec2005
Masses,m1 and m2 at the 20-cm and 65-cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m2 : m1
A2 : 1
B3 : 3
C2 : 3
D1 : 2
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Question 520
waec2005
A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine
