The stress experienced by a wire of diameter \(\frac{\text{y}}{\pi}\)m loaded by a weight y\(^2\)N is
Trả lời
(C)
4\(\pi\)Nm\(^{-2}\)
2
Under which conditions is work done
Trả lời
(C)
A boy climbs onto a table
3
The mechanical advantage of the machine shown above
Trả lời
(C)
30.0
4
Rainbow is formed when sunlight undergoes
Trả lời
(C)
dispersion
5
Find the value of a capacitor with voltage 5V and 30C.
Trả lời
(B)
6f
6
When a bus is accelerating, it must be
Trả lời
(B)
changing its velocity
7
The friction due to air mass can be reduced by
Trả lời
(A)
streaming
8
Which of the following operates based on magnetic effect of electric current?
Trả lời
(C)
Dynamo
9
When a charged ebonite rod is brought near a charged glass rod, there will be
Trả lời
(A)
attraction
10
Pilots uses aneroid barometer to know the height above sea level because
Trả lời
(B)
Small and convenient
11
A light ray passing from air into water at an angle of 30º from the normal in air would
Trả lời
(D)
make an angle less than 30\(^0\) from the normal in water
12
A solid cube of aluminum is 1.5cm on each edge. The density of aluminum is 2700kgm\(^{-1}\). Find the mass of the cube.
Trả lời
(B)
9.1g
13
The value of R required to make the galvanometer measure voltage up to 40V in the diagram above
Trả lời
(B)
1990\(\Omega\)
14
5 X 10\(^{-3}\)kg of liquid at its boiling point is evaporated in 20s by the heat generated by a resistor of 2\(\Omega\) when a current of 10A is used. The specific latent heat of vaporization of the liquid is
Trả lời
(B)
8.0 x 10\(^5\)Jkg\(^{-1}\)
15
If the S.V.P of water vapour was 13.5mmHg at 33ºC and 7.3mmHg at 7ºC. Find the percentage relative of the air on a day when average air temperature was 33ºC and dew point was 7ºC.
Trả lời
(C)
54%
16
Electrolysis can be investigated using
Trả lời
(D)
Voltameter
17
A wheelbarrow inclined at 60º to the horizontal is pushed with a force of 150N. What is the horizontal component of the applied force
Trả lời
(B)
75N
18
In a solar panel, solar beam is concentrated by using
Trả lời
(A)
Concave mirror
19
A rectifier is a device that changes
Trả lời
(D)
A.C to D.C
20
The dimension of young's modulus,E is given by
Trả lời
(C)
ML\(^{-1}\)T\(^{-2}\)
21
The moon's acceleration due to gravity is \(\frac{1}{6}\) of the earth's value. The weight of a bowling ball on the moon would be
Trả lời
(B)
\(\frac{1}{6}\) of its weight on the earth
22
If a sheet of an insulating material is inserted between the plates of an air capacitor, the capacitance will
Trả lời
(C)
increase
23
288KJ is conducted across two opposite faces of a 3m cube of temperature gradient 90ºCm\(^{-1}\) in 7200s. Calculate the thermal conductivity.
Trả lời
(A)
4.9 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
24
A sonometer's fundamental note is 50Hz, what is the new frequency when the tension is four times the original?
Trả lời
(B)
100Hz
25
Which of the following is not a part of model rocket?
Trả lời
(D)
Not recovery devices
26
A thick glass tumbler cracks when boiling water is poured into it because
Trả lời
(A)
The inside expands more rapidly than the outside
27
How much joules of heat are given out when a piece of iron, of mass 60g and specific heat capacity 460JKg\(^{-1}\)K\(^{-1}\), cools from 75ºC to 35ºC
Trả lời
(D)
1104J
28
The energy of light of frequency 2.0 x 10\(^{15}\)Hz is (h = 6.63 x 10\(^{-34}\)Js)
Trả lời
(B)
1.33 x 10\(^{-18}\)J
29
A mass of gas at 40mmHg is heated from 298k to 348k at constant volume. Cal the pressure exerted by the gas.
Trả lời
(B)
46.71mmHg
30
The distance between two successive crests of a water wave is 0.25m. If a particle on the surface of the water makes four complete vertical oscillations in one second. Calculate the speed of the wave.
Trả lời
(D)
1ms\(^{-1}\)
31
The thermometer whose thermometric property is change in volume with temperature is
Trả lời
(D)
Liquid-in-glass thermometer
32
In a series resonant circuit, the current flowing in the circuit is
Trả lời
(A)
maximum
33
If a body in linear motion changes from point P to Q, the motion is
Trả lời
(A)
Translational
34
Which of these gas laws is equivalent to workdone
Trả lời
(C)
Boyle's law
35
The process of adding impurities to a semiconductor material to increase its conductivity is
Trả lời
(C)
Doping
36
A load of 300N is to be lifted by a machine with a velocity ratio of 2 and an efficiency of 60%. What effort will be applied to lift the load?
Trả lời
(C)
250N
37
The average translational kinetic energy of gas molecules depends on
Trả lời
(A)
Temperature only
38
The fourth overtone of a closed pipes is 900Hz, its fundamental frequency is
Trả lời
(B)
100Hz
39
A cell of internal resistance of 2\(\Omega\) supplies current through a resistor, X if the efficiency of the cell is 75%, find the value of X.
Trả lời
(C)
6\(\Omega\)
40
In voltage measurement, the potentiometer is preferred to voltmeter because it
Trả lời
(B)
consumes negligible current
41
Which of the following is the best as shaving mirror?
Trả lời
(A)
Concave mirror
42
A refrigerator uses 150W. If it is kept on for 336 hours non-stop, what is the energy consumed in KWh?
Trả lời
(B)
50.40KWh
43
What is the inductance reactance of a coil of 7H when connected to a 50Hz a.c circuit?
Trả lời
(A)
2200\(\Omega\)
44
If a charge ion goes through a combined electric field E and magnetic field B, the resultant emergent velocity of the ion is
Trả lời
(A)
\(\frac{E}{B}\)
45
In electrolysis, when same quantity of electricity is passed through different electrolytes, mass of substances deposited is proportional to
Trả lời
(B)
Chemical equivalent
46
If the rate of evaporation is y, and the rate of condensation is x, then, a vapour is saturated when
Trả lời
(C)
x = y
47
The degree of precision of a vernier caliper is
Trả lời
(B)
0.01cm
48
According to kinetic theory of gases, the pressure exerted by the gas on the wall is equal
Trả lời
(B)
rate of change of momentum imparted by the walls per second per unit area
49
The property by which a material returns to its original shape after the removal of force is called
Trả lời
(A)
Elasticity
50
The energy in a moving car is an example of
Trả lời
(D)
Kinetic energy
51
A hydrometer of mass y kg and volume 2y x 10\(^{-5}\)m\(^3\) floats in a fluid with 20% of its volume above the fluid, what is the density of the fluid?
Trả lời
(D)
6.25 x 10\(^4\)kgm\(^{-3}\)
52
Convert 60ºC to degree Fahrenheit
Trả lời
(D)
140.00\(^0\)F
53
What is the least possible error encountered when taking measurement with a metre rule?
Trả lời
(B)
0.5mm
54
At absolute zero temperature, the average velocity of the molecules
Trả lời
(C)
Is zero
55
Calculate the quantity of heat for copper rod whose thermal capacity is 400Jk\(^{-1}\) for a temperature change of 60ºC to 80ºC
Trả lời
(D)
8KJ
56
When a cell of e.m.f 3.06V is connected, the balance of a potentiometer is 75cm, Calculate the new balance of a cell of e.m.f 2.295V
Trả lời
(A)
56.26cm
57
A body is whirled in a horizontal circle at the rate of 800 revolutions per minute. Determine the angular velocity
Trả lời
(D)
26.7\(\pi\)rads\(^{-1}\)
58
If the velocity ratio of a machine is 4, what does it mean?
Trả lời
(B)
Distance moved by effort is 4 times greater than the distance moved by load.
59
Which of the following materials has a very large energy gap band?
Trả lời
(B)
Insulator
60
A red shirt under a red light appears pale because red
Trả lời
(D)
absorbs other colours and reflects red
61
An electron falls from an energy level of -5.44eV to another energy level, E. If the emitted photon is of wavelength 5.68 x 10\(^{-6}\)m, calculate the energy change. [ Plank's constant = 6.63 x 10\(^{-34}\)Js, emitted radiation speed = 3.0 x 10\(^8\)ms\(^{-1}\)]
Trả lời
(C)
3.49 x 10\(^{-20}\)J
62
Using the diagram above, the effective force pushing it forward at an angle 60º is
Trả lời
(A)
25.00N
63
The gravitational force between two objects is 10N, what is the new value of the force if the distance between them is halved?
Trả lời
(C)
40N
64
An ideal transformer has
Trả lời
(B)
No flux leakage
65
Calculate the depth of a swimming pool if the apparent depth is 10cm. ( Refractive index of water = 1.33 )
Trả lời
(C)
13.3cm
66
What will be the weight of a man of mass 60kg standing in a lift if the lift is descending vertically at 3ms\(^2\)?
Trả lời
(D)
420N
67
The gravitational force between two objects masses 10\(^{24}\)kg and 10\(^{27}\)kg is 6.67N. Calculate the distance between them [ G = 6.6 x 10\(^{-11}\)Nm\(^2\)kg\(^{-2}\) ]
Trả lời
(A)
1.0 x 10\(^{20}\)m
68
The tangential force acting on an object that opposes it from sliding freely on the adjacent surface is called
Trả lời
(B)
Friction force
69
Two tuning forks of frequencies 6Hz and 4Hz respectively are sounded together. The beat frequency is
Trả lời
(A)
2Hz
70
The capacitance of a capacitor, C, is inversely proportional to
Trả lời
(C)
distance between plate
71
The value of R in the above circuit to make the galvanometer measure 2A is
Trả lời
(B)
0.256\(\Omega\)
72
An object is placed 25cm in front of a convex mirror has its image formed 5cm behind the mirror. what is the focal length of the convex mirror
Trả lời
(B)
6.25cm
73
In a Hare's apparatus, the height of water and a liquid X are 0.3m and 0.5m respectively. The relative density of x is?
Trả lời
(B)
0.6
74
The quantity of heat required to melt ice of 0.2 kg whose specific latent heat is 3.4 x 10\(^5\)J/Kg is
Trả lời
(A)
6.8 x 10\(^4\)J
75
I It wets glass
II It needs to be coloured
III It has a low density
Water is not suitable for use as a thermometric liquid because
Trả lời
(C)
I, II, and III only
76
The power of a convex lens of focal length 20cm is
Trả lời
(C)
5.00D
77
The charge of magnitude 1.6 x 10 \(^{-19}\)C is placed in a uniform electric field of intensity 1200Vm\(^{-1}\). Calculate its acceleration, if the mass of the charge is 9.1 x 10\(^{-31}\)kg
Trả lời
(A)
2.11 x 10\(^{14}\)ms\(^{-2}\)
78
Calculate the power of an object which moves through a distance of 500cm in 1s on a frictionless surface by a horizontal force of 50N
Trả lời
(D)
250W
79
The defect of the eye lens which occurs when the ciliary muscles are weak is
Trả lời
(C)
Presbyopia
80
The energy stored in the above capacitor is
Trả lời
(A)
2.25J
81
An effort of 40N is applied on a machine to lift a mass of 60kg. Determine the mechanical advantage of the machine [ g = 10ms\(^2\) ]
Trả lời
(D)
15
82
The land and sea breeze is attributed to
Trả lời
(D)
convection
83
A practical application of total internal reflection is found in
Trả lời
(D)
fiber optics
84
Calculate the magnetic force on an electron in a magnetic field of flux density 10T, with a velocity of 3 x 10\(^7\)m/s at 60º to the magnetic field (e = 1.6 x 10\(^{-19}\)C)
Trả lời
(C)
4.16 x 10\(^{-11}\)N
85
Calculate the upthrust on a spherical ball of volume 4.2 x 10\(^{-4}\)m\(^{3}\) when totally immersed in a liquid of density 1028kgm\(^{-3}\)
Trả lời
(B)
4.3N
86
At a pressure of 10\(^5\)Nm\(^{-2}\), a gas has a volume of 20m\(^3\). Calculate the volume at 4 x 10\(^5\)Nm\(^{-2}\) at constant temperature.
Trả lời
(D)
5m\(^3\)
87
A particular household utilizes three electrical appliances for six hours daily if the appliances are rated 80W, 100W, and 120W respectively. Calculate the electrical bills paid monthly if an average month is 31 days. [1kwh = #24.08k]
Trả lời
(C)
₦ 1343.66k
88
A body is pulled on a horizontal surface with a rope inclined at 30º to the vertical. If the effective force pulling the body along the horizontal surface is 15N, calculate the tension on the rope.
Trả lời
(A)
30N
89
Newton's law of cooling is valid only for a
Trả lời
(A)
small temperature range
90
When thermal energy in a solid is increased, the change in state is called
Trả lời
(A)
melting
91
I clear II sharp III poor IV dark
Which of the above happens when the hole of a pinhole camera is diminished?
Trả lời
(B)
II only
92
A blacksmith heated a metal whose cubic expansivity is 3.9 x 10\(^{-6}\)K\(^{-1}\). Calculate the area expansivity.
Trả lời
(B)
2.6 x 10\(^{-6}\)K\(^{-1}\).
93
The unit of impedance is
Trả lời
(A)
\(\Omega\)
94
If the displacement of a car is proportional to the square of time, then the car is moving with
Trả lời
(A)
Uniform acceleration
95
The equivalent capacitance of the capacitors in the circuit above
Trả lời
(A)
\(\frac{5}{2}\)C
96
Using the diagram above, calculate the relative density of x, if the density of methanol is 800kgm\(^{-3}\)
Trả lời
(B)
0.5
97
The force of attraction between molecules of the same substance is
Trả lời
(A)
cohesion
98
If the pressure on an enclosed gas is doubled and its temperature rises from 27ºC to 127ºC, then its volume will
Trả lời
(D)
decrease by \(\frac{1}{3^{rd}}\)
99
The simple form of the lead acid accumulator often has a negative pole of
Trả lời
(D)
lead plate
100
A monochromatic light is one that
Trả lời
(C)
has one wavelength
101
Bifocal lens is used to correct the eye defect of
Trả lời
(D)
presbyopia
102
A force of 10N extends a spring of natural length 1m by 0.02m, calculate the length of the spring when the applied force is 40N.
Trả lời
(C)
1.08m
103
Infra-red thermometers work by detecting the
Trả lời
(A)
radiation from the body and converting it to temperature
104
The efficiency of a cell with internal resistance of 2\(\Omega\) supply current to a 6\(\Omega\) resistor is
Trả lời
(D)
75%
105
Which of the following measuring instruments operates based on the heating effect of electric current?
Trả lời
(B)
hot wire ammeter
106
What is the colour of red rose under a blue light?
Trả lời
(D)
Black
107
Calculate the value of electric field intensity due to a charge of 4μC if the force due to the charge is 8N
Trả lời
(A)
2.0 x 10\(^6\)NC\(^{-1}\)
108
An accumulator is 90% efficient. If it gives out 2700J of energy while discharging, how much energy does it take in?
Trả lời
(B)
3000J
109
Two capacitors of 0.0003μF and 0.0006μF are connected in series, find their combined capacitance.
Trả lời
(B)
0.0002μF
110
Two points on a velocity-time graph have coordinates (2s, 5m/s) and (4s, 15m/s). Calculate the mean acceleration
Trả lời
(A)
5.0ms\(^2\)
111
An air force jet flying with a speed of 335m/s went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?
Trả lời
(B)
1675m
112
In the diagram above, the galvanometer is converted to
Trả lời
(B)
Ammeter
113
The diaphragm in the camera is similar to what part of the eyes?
Trả lời
(D)
Iris
114
The device for measuring the angle of dip is
Trả lời
(A)
Dip circle
115
The velocity ratio of an inclined plane at 60º to the horizontal is
Trả lời
(B)
1.155
116
The bursting of water pipes during very cold weather, when the water in the pipes form ice could be attributed to
Trả lời
(B)
expansion of water on freezing
117
One of these is not the use of an electroscope
Trả lời
(B)
measuring ionization current in air
118
As per Faraday's laws of electromagnetic induction, an e.m.f is induced in a conductor whenever
