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 42
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 43
waec2004
A body is dropped from a certain height above the ground level, falls with uniform
Aspeed
Bvelocity
Cacceleration
Dretardation
View Explanation & Discuss
Question 44
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 45
waec2004
The speed of an object in rectilinear motion can be determine from the
Aarea under a velocity-time graph
Barea under a distance-time graph
Cslope of a distance-time graph
Dslope of a velocity-time graph
View Explanation & Discuss
Question 46
waec2004
A machine of velocity ratio 5 is used in lifting a load with an effort of 500N. If the machine is 80% efficient. Determine the magnitude of load
A2500N
B2000N
C900N
D625N
View Explanation & Discuss
Question 47
waec2004
An elastic string of force constant 200N m-1 is stretched through 0.8m within its elastic limit. Calculate the energy stored in the string
A64.0J
B80.0J
C128.0J
D160.0J
View Explanation & Discuss
Question 48
waec2004
On which of the following factor does the viscosity of a liquid depend? i. Nature of the liquid. ii. Temperature of the liquid. iii. Area of the liquid surface
Ai and ii only
Bii and iii only
Ci and iii only
Di, ii and iii
View Explanation & Discuss
Question 49
waec2004
A steel needle floating on water, sinks when kerosine is added to the water. This is because the kerosine
Aincreased the surface tension of the water
Breduces the density of the water
Creduces the surface tension of the water
Dreduces the upthrust on the needle
View Explanation & Discuss
Question 50
waec2004
A diver is 5.2m below the surface of water of density 1000Kgm-3. If the atmospheric pressure is 1.02 x 105pa. Calculate the pressure on the diver [g = 10ms-2]
A6.20 x 104 pa
B1.02 x 105 pa
C1.54 x 105 pa
D5.20 x 105 pa
View Explanation & Discuss
Question 51
waec2004
Which of the following concept is not an evidence of the particle nature of matter?
Adiffusion
Bbrownian motion
Cdiffraction
Dcrystallization
View Explanation & Discuss
Question 52
waec2004
The diagram above represent displacement D, versus time, t graph of a progressive wave. Deduce the frequency of the wave
A20 Hz
B10 Hz
C5 Hz
D4 Hz
View Explanation & Discuss
Question 53
waec2004
Calculate the change in volume when 90g of ice is completely melted. [density of water = 1g cm-3, density of ice = 0.9cm-3]
A0.00cm3
B9.00cm3
C10.00cm3
D90.00cm3
View Explanation & Discuss
Question 54
waec2004
An object weighs 60.0N in air, 48.2N in a certain liquid X, and 44.9N in water, Calculate the relative density of X
A3.300
B1.279
C0.932
D0.782
View Explanation & Discuss
Question 55
waec2004
Which of the following statements about the mass and the weight of a body is not correct? its
Amass is a scalar quantity
Bweight is a function of the gravitational pull on it
Cmass on earth and on the moon is the same
Dweigh at the equatior and at the poles is the same
View Explanation & Discuss
Question 56
waec2004
The molecular structure of a liquid is such that
Athe molecules have unlimited freedom of movement
Bmolecular movement is restricted to vibration only
Cintermolecular collisions take place
Dall molecules moves move with the same speed
View Explanation & Discuss
Question 57
jamb2004
If a force of 50N stretches a wire from 20m to 20.01m, what is the amount of force required to stretch the same material from 20m to 20.05m?
A250N
B200N
C100N
D50N
View Explanation & Discuss
Question 58
jamb2004
A cell whose internal resistance is 0.5Ω delivers a current of 4A to an external resistor,The loss voltage of the cell is
A1.250V
B2.000V
C8.000V
D0.125V
View Explanation & Discuss
Question 59
jamb2004
Calculate the angle of minimum deviation for a ray which is refracted through an equiangular prism of refractive index 1.4
A600
B290
C990
D900
View Explanation & Discuss
Question 60
jamb2004
A man exerts a pressure of 2.8 x 103Nm-2 on the ground and has 4 x 10-2m2 of his feet in contact with the ground. The weight of the man is
