The radius of a wheel is 30.0 cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine. Assuming 100% efficiency
A600.0N
B40.0N
C24.0N
D20.0N
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Question 363
waec2011
Which of the following statements correctly defines a simple machine? A device
Athat can produce electric current
Bwhich can only carry people from one place to another
Cwith which work can be done easily
Dwhich changes the state of rest or of uniform motion of an object
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Question 364
waec2011
A coin is pushed from the edge of a laboratory bench with a horizontal velocity of 15.0 ms-1. If the height of the bench from the floor is 1.5m, calculate the distance from the foot of the bench to the point of impact with the floor [g = 10ms-2]
A0.75m
B2.25m
C8.22m
D15.00m
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Question 365
waec2011
An object of mass 5.0 kg moves with a velocity of 10ms-1. Calculate its momentum.
A50.0 kgms-1
B15.0 kgms-1
C2.0 kgms-1
D0.5 kgms-1
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Question 366
waec2011
Two simple pendulum A and B of equal lengths and of masses 5g and 20g respectively are located in the same environment. The periods TA and TB of their respective oscillations are related by the equations
ATA = 4TB
BTA = \(\frac{1}{4} T_B\)
CTA = TB
DTA = 5TB
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Question 367
waec2011
A body of mass 120g placed at the 10cm mark on a uniform metre rule makes the rule settle horizontally on a fulcrum places at 35cm mark. Calculate the mass of the rule
A60g
B80g
C120g
D200g
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Question 368
waec2011
A stone of mass 300g is released from rest from the top of a bulding of height 100m. Determine the kinetic energy gained by the stone when it is a quarter way down from the point of release.[g = 10 ms-2]
A750.0J
B225.0J
C75.0J
D22.5J
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Question 369
waec2011
Which of the following propeties is not considered in choosing mercury as a thermomemetric liquid?
Adensity
Bexpansivity
Cconductivity
Dopacity
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Question 370
waec2011
In the absence of gravitational force, the weight of the body is
Aits mass
Bzero
Cits density
Dits volume
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Question 371
waec2011
The area under a velocity-time graph represents
Afinal velocity attained
Bdistance covered
Cacceleration
Dworkdone
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Question 372
waec2011
The property of a fluid that is used to determine its suitability as a lubricant is its
Acapillarity
Bviscocity
Csurface tension
Drelative density
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Question 373
waec2011
The pressure in a liquid
Ais the same at all points in the liquid
Bdecreases with depth
Cis the same in all directions at a given point
Dis equal to the atmospheric pressure
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Question 374
waec2011
A metal rod of density 7000 kgm-3 and cross-sectional area of 0.001257m2 has a mass of 1.76kg. Calculate its length.
A0.20m
B0.25m
C0.40m
D0.50m
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Question 375
waec2011
The density P of a spherical ball of diameter d and mass m is given by
AP = \(\frac{3m}{4 \pi d^3}\)
Bp = 4\(\pi md^3\)
Cp = \(\frac{6m}{\pi d^3}\)
Dp = \(\frac{3m}{2 \pi d^3}\)
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Question 376
waec2011
Which of the following statements is not correct?
Amolecules of ice, water and water vapour have equal intermolecular distances
Bmolecules of ice, water and water vapour do not differ in the structure of their molecules
Cmolecules of water vapour attract each other with forces far less than the forces of attraction between water molecules
Dwater is less compressible than water vapour
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Question 377
waec2010
Neutrons are used to induce artificial radioactivity because they
Aare energetic
Bhave no charge
Chave no mass
Dare ionizing
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Question 378
waec2010
A nuclide represented as \(^{70}_{32}X\) has a neutron-proton ratio of
A0.5
B0.8
C1.2
D1.5
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Question 379
waec2010
In a cathode ray tube, the function of the x-plates is to
Adeflect the electron beam horizontally
Bdeflect the electron beam vertically
Creflect the electron beam
Dgenerate sinusoid waves
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Question 380
waec2010
Oxidation of the filament in a light bulb is prevented by the introduction of
