A constant force acts on a body of mass 50kg and changes its speed from 20ms-1 to 90ms-1 in 10 seconds. Calculate the magnitude of the force applied.
A590N
B500N
C450N
D350N
E180N
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Question 1122
neco2005
Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will
Ahave any one force being the equilibrant of the other two
Bmake a body move randomly
Cmake a body oscillate
Dmove a body along a straight line
Erotate a body about its axis
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Question 1123
neco2005
Radio receivers are tuned using
Aelectromagnets
Belectric motors
CInductors
Dvariable capacitors
Evariable resistors
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Question 1124
neco2005
An electric motor primary converts
Aelectrical energy to chemical energy
Belectrical energy to heat energy
Celectrical energy to mechanical energy
Dmechanical energy to electrical energy
Emechanical energy to light energy
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Question 1125
neco2005
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
AII only
BI and II only
CII and III only
DI and III only
EI, II, and III
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Question 1126
neco2005
Which of the following radiations has the shortest wavelength?
AInfrared rays
BLight waves
CMicrowaves
DUltraviolet rays
EX-rays
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Question 1127
neco2005
Which of the following is/are longitudinal wave(s)?
I. Light waves from the sun
II. Sound waves in the air
III. Waves on a vibrating string
AI only
BII only
CI and II only
DI and III only
EII and III only
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Question 1128
neco2005
A radio station broadcasts at a frequency of 400 kHz. If the speed of the wave is 3.0 ×10\(^{-8}\)ms\(^{-1}\), calculate the wavelength of the radio wave.
A1.3 × 102m
B3.0 × 102m
C2.4 × 102m
D5.0 × 102m
E7.5 × 10-14m
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Question 1129
neco2005
A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is
AFs cos θ
BFs cosec θ
CFs sec θ
DFs sin θ
EFs tan θ
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Question 1130
neco2005
Which of the following will reduce the frequency of oscillation of a simple pendulum?
ADecreasing the length of the string
BIncreasing the amplitude of oscillation
CIncreasing the length of the string
DIncreasing the mass of the bob
EReducing the mass of the bob.
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Question 1131
neco2005
Which of the following statements is correct?
AAlpha particles have a large mass and high penetrating power
BAlpha particles have a small mass and a low penetrating power
CBeta partials have no mass and a high penetrating power
DBeta particles have a large mass and a low penetrating power
EGamma rays have no mass and a high penetrating power
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Question 1132
neco2005
The charge of an alpha particle can be neutralized by
A1 beta particle
B2 photons of gamma rays
C2 beta particles
D4 beta particles
E4 photons of gamma rays
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Question 1133
neco2005
Which of the following is used for shielding radioactive fallout?
AAluminum
BLead
CIron
DPlastic
EWood
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Question 1134
neco2005
Which of the following is a percussion Instrument?
AFlute
BGuitar
CPiano
DTrumpet
EXylophone
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Question 1135
neco2005
Which of the following statements is/are correct in any machine?
I. The velocity ratio is usually greater than the mechanical advantage.
II. Efficiency work inputwork outputIII. The velocity ratio is independent of friction.
AI only
BIII only
CI and II only
DI and III only
EII and III only
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Question 1136
neco2005
An object of mass 5.0 cg moving with a velocity of 12ms-1 due north hits a stationary body of mass 7.0kg. If they stick together after collision and move with velocity V due north, calculate the magnitude of V.
A12ms-1
B7ms-1
C6ms-1
D5ms-1
E4ms-1
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Question 1137
neco2005
Which of the following is NOT a component of an a.c. generator?
AArmature
BCarbon brushes
CMagnet
DSlip ring
ESplit rings
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Question 1138
neco2005
Which of the following is a non-renewable energy source?
ACoal
BHydro
COcean waves
DSolar
ETides
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Question 1139
neco2005
The escape velocity of an object from the gravitational field of a planet
I. Increases with the mass of the object
II. Increases with the mass of the planet
III. Is smaller on the moon than on the earth. Which of the above statements is/are correct?
AI only
BII only
CI and II only
DII and III only
EI, II and III
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Question 1140
neco2005
The mercury column in a simple mercury barometer is of height 5m above the mercury in a reservoir. If the tube is replaced with one whose radius is twice that of the first tube, what will be the height of the mercury column in the new tube?
