During a thunderstorm, lightning and thunder occurred simultaneously in the atmosphere. An observer on the earth surface's sees the lightning flash shortly before hearing the thunder. This is because the
Aatmospheric pressure is higher at the surface than at the higher altitudes
Bspeed of sound is less than that of light
Ctemperature of the atmosphere decreases with altitude
Datmospheric density decreases with altitude
View Explanation & Discuss
Question 12
waec2004
A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera
A0.18m
B0.50m
C1.62m
D18.00m
View Explanation & Discuss
Question 13
waec2004
The image of an optical pin placed at the principal focus of a concave mirror will be formed
Abetween the principal focus and the pole
Bat the centre of the curvature
Cbetween the principal focus and the centre of curvature
Dat infinity
View Explanation & Discuss
Question 14
waec2004
A wave travelling from water to glass suffers a change in its speed at the common boundary. Which of the following properties explains this observation?
Adispersion
Brefraction
Cinterference
Ddiffraction
View Explanation & Discuss
Question 15
waec2004
The basic difference between a transverse wave and a longitudinal wave travelling in the same direction in a medium is in the
Aamplitude of the wave
Bwavelength of the wave
Cdirection of vibration of the particles of the medium
Dperiod of vibration of the particle of the medium
View Explanation & Discuss
Question 16
waec2004
The temperature of 900cm3 of an ideal gas at a pressure of 114cm Hg is 27oC. Calculate its volume at 76cm Hg and 0oC
A50.0cm3
B546.0cm3
C659.3cm3
D1228.5cm3
View Explanation & Discuss
Question 17
waec2004
On a basis of the kinetic theory, an increase in the temperature of a fixed volume of an ideal gas causes
Aa incease in the number of gas molecules
Ba decrease in the density of the gass
Can increase in the average speed of the gas molecules
Da decrease in pressure exerted by the gas
View Explanation & Discuss
Question 18
waec2004
A faulty barometer reads 72.6cm Hg when the atmospheric pressure is 75.0cm Hg. Calculate the atmospheric pressure when the barometer reads 72.0cn Hg
A79.4cm Hg
B74.38cm Hg
C74.2cm Hg
D69.4cm Hg
View Explanation & Discuss
Question 19
waec2004
When a metal ball is heated through 30oC,its volume becomes 1.0018cm3. If the linear expansivity of the material of the ball is 2.0 x 10-5 K-1, calculate its original volume
A1.0000cm3
B1.0020cm3
C1.0036cm3
D1.0180cm3
View Explanation & Discuss
Question 20
waec2004
On a cold day, a concrete floor feels colder to the bear foot then a mat on the same floor because the
Ais better conductor of heat than the foot
Bmat loses heat to the bare foot at a faster rate
Cmat is better conductor of heat than the floor
Dconcrete floor is a better conductor of heat than the mat
View Explanation & Discuss
Question 21
waec2004
Which of the following values on the absolute scale of temperature is the ice point?
A0K
B32K
C100K
D273k
View Explanation & Discuss
Question 22
waec2004
When compared with water, mercury is preferred as a thermometric liquid because
Ahas a higher density
Bhas lower specific heat capacity
Cexhibits anomalous thermal expansion
Dcontains molecules which have very strong adhesive forces
View Explanation & Discuss
Question 23
waec2004
A loaded spring performs simple harmonic motion with an amplitude of 5cm. If the maximum acceleration of the load is 20cm s-1, calculate the angular frequency of the motion
A2 rad s-1
B4 rad s-1
C5 rad s-1
D10 rad s-1
View Explanation & Discuss
Question 24
waec2004
A ball bearing is projected vertically upwards from the ground with a velocity of 15ms-1. Calculate the time taken by the ball to return to the ground [g = 10ms-1]
A1.5s
B3.0s
C5.0s
D7.5s
View Explanation & Discuss
Question 25
waec2004
The bob of a single pendulum has a mass of 0.02kg. Determine the weight of the bob [g = 10ms-2]
A0.02N
B0.20N
C20.00N
D200.00N
View Explanation & Discuss
Question 26
waec2004
A force acting on a body causes a change in the momentum of the body from 12kg ms-1 to 16kg ms-1 in 0.2s. calculate the magnitude of the force
A140.0N
B20.0N
C4.0N
D0.8N
View Explanation & Discuss
Question 27
waec2004
A body of mass 8kg moving with a speed of 30ms-1 is brought to rest in 2.5s by a constant retarding force. Calculate the magnitude of the force
A240N
B96N
C20N
D9N
View Explanation & Discuss
Question 28
waec2004
A body is dropped from a certain height above the ground level, falls with uniform
Aspeed
Bvelocity
Cacceleration
Dretardation
View Explanation & Discuss
Question 29
waec2004
A body is said to be moving with uniform acceleration if it experiences equal
Aincrease in velocity at equal time intervals
Bdecreases in velocity at equal time intervals
Cincreases in speed at equal time intervals
Ddecreases in speed at equal time intervals
View Explanation & Discuss
Question 30
waec2004
The speed of an object in rectilinear motion can be determine from the
