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Physics
UTME / JAMB 2015
Current Electricity & Electric Circuits
Solution
The device in which one circuit controls another, especially if the current in the second circuit is large or dangerous is known as
A
Electromagnetic devices
B
Magnetic relay device
C
None at all
D
Sextant
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Magnetic relay device :is the device that controls a circuit (i.e one circuit )if a current in the second circuit is large or dangerous
Source: Myschool Past Questions Archive (Record #40840)
Physics
UTME / JAMB 2015
Gas Laws & Heat Transfer
Solution
Heat transfer in the surrounding without a material medium is possible through?
A
Conduction
B
Convection
C
Radiation
D
Expansion
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Conduction, convection of heat or electricity through a material medium is required but radiation requires no material medium for heat transfer
Source: Myschool Past Questions Archive (Record #40842)
Physics
UTME / JAMB 2015
Calorimetry, Latent Heat & Change of State
Solution
Quantities of heat Q can be measured using a container called
A
Thermometer
B
Measuring cylinder
C
Calorimeter
D
Meter rule
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Calorimeter is an apparatuses used for measuring the heat (Q) generated or absorbed by change of phase (state) or other physical change
Source: Myschool Past Questions Archive (Record #40850)
Physics
UTME / JAMB 2015
Current Electricity & Electric Circuits
Solution
Lodestone is a natural magnet, it points at
A
N – W when suspended freely
B
N–S when suspended freely
C
S – E when suspended freely
D
S–W when suspended freely
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Lodestone is a natural magnet it points approximate at N – S when suspended freely
Source: Myschool Past Questions Archive (Record #40851)
Physics
UTME / JAMB 2015
Gas Laws & Heat Transfer
Solution
What type of electromagnetic radiation can be used to take photographs in the haze?
A
Radio waves
B
infrared rays
C
Visible light
D
Gamma rays
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Infrared rays are easily detected by special photographic films and it can be used for taking picture in haze
Source: Myschool Past Questions Archive (Record #40852)
Physics
UTME / JAMB 2015
Linear Motion, Projectiles & Kinematics
Solution
If a mango fruit dropped at a height of 50 meters. How long does it reach the ground? (take g = 10m/s2)
A
2 sec
B
3 sec
C
4sec
D
3.2sec
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
From S = ut + ½gt2
u = 0ms-1
50 = (0 × t) + ½(10)(t2)
50 = 5.0t2
t2 =50/5
t = √10
t = 3.2sec
Source: Myschool Past Questions Archive (Record #40854)
Physics
UTME / JAMB 2015
Calorimetry, Latent Heat & Change of State
Solution
A zinc has a heat capacity of 40 J/K, what is the mass of the zinc, given that the specific heat of zinc is 380 J/kg k
A
0.11kg
B
0.12kg
C
0.13kg
D
0.14kg
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Heat capacity (o) = mass (kg) specific heat of a substance (C2)
i.e Q = MC
where Q = 40 J/L, m = ?(380 J/Kgk)
40 = m × 380
m = 0.11kg (Approx)
Source: Myschool Past Questions Archive (Record #40855)
Physics
UTME / JAMB 2015
Linear Motion, Projectiles & Kinematics
Solution
If a ball released from a height of 20m, How long would it take the ball to reach the ground? (assures g = 10m/s)
A
2sec
B
3sec
C
35sec
D
2.4sec
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Using the equation
S = ut + ½ gt2
H = s = 20m, t = ?
G =10m/s2, u = 0m/s
20 = 0 × t × ½ × 10 t
20 = 5t
i.e 5t2 = 20
t = 20/5 = 4
t = 4 (squaring both sides)
√ t2 = √4
= 2sec
∴ t = 2sec
Source: Myschool Past Questions Archive (Record #40857)
Physics
UTME / JAMB 2015
Work, Energy, Power & Simple Machines
Solution
If the velocity ratio of a machine is 5. What is its ratio of x and y?
A
2 : 5
B
1 : 5
C
5 : 1
D
3 : 1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Velocity Ratio (V.R) = distance moved by the effort (x)÷ distance moved by the load (y)
i.e. V.R = x/y
v. R = 5, x/y = ?
i.e x/y = 5/1; , where x = 5, y = 1
x : y = 5 : 1
Source: Myschool Past Questions Archive (Record #40859)
Physics
UTME / JAMB 2015
Work, Energy, Power & Simple Machines
Solution
If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT?
A
4:01
B
1:04
C
5:01
D
2:01
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Mechanical advantage (M.A) of a machine is the ratio of its load to effort
Mathematically
Mechanical advantage (M.A) = Load (L) ÷ Effort (E)
In symbol M.A = L/E
Note:Mechanical (advantages has no S.I unit)
If M.A = 4 then,
L/E = 4/1
The ratio of load to effort = 4 : 1 respectively
Source: Myschool Past Questions Archive (Record #40860)
Physics
UTME / JAMB 2015
Temperature, Thermometry & Thermal Expansion
Solution
For a best result using temperature to achieve an accurate measurement, it is best to use
A
Mercury thermometer
B
gas thermometer
C
clinical thermometer
D
alcohol thermometer
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Gas thermometers are considered best for use to achieve an accurate temperature than others, such as liquid in glass thermometers such as mercury, clinical and alcohol thermometer
Source: Myschool Past Questions Archive (Record #40862)
Physics
UTME / JAMB 2015
Current Electricity & Electric Circuits
Solution
A structural engineer stood on a top of a building releasing a light and heavy object to the ground which of the following statement is true?(Neglect Air Resistance)
A
Both the light and heavy subject reach the ground at the same time
B
The light object get to the ground first before the heavy object
C
The heavy object to the ground first before the light object
D
None get to the ground first
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
(Neglect of Air resistance)
Note: Both objects reach the ground at the same time
Source: Myschool Past Questions Archive (Record #40864)
Physics
UTME / JAMB 2015
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
If an object whose mass is 3kg moves in a circular path of a radius 0.7m, records a speed at 2m/s. What is the result of the angular velocity?
A
4 rads–1
B
1rads–1–1
C
3–1rads–1
D
4rads–1–1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
M= 3kg, r = 0.7m, v = 2m/s
v = wr
w = angular velocity
r = radius in an tangential circular
v = speed of an object
W = V/δ = 2/ 0.7 = 2.85
W = 2.853rads–1 (total interest whole number)
W = &approx.; 3rads–1Angular velocity (w) = 3rads–1
Source: Myschool Past Questions Archive (Record #40867)
Physics
UTME / JAMB 2015
Reflection, Refraction & Dispersion of Light
Solution
The optical instrument which is suitable for viewing a nearby objects is ………..?
A
Telescope
B
sextant
C
microscope
D
periscope
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Microscope is used for nearby object
Source: Myschool Past Questions Archive (Record #40869)
Physics
UTME / JAMB 2015
Current Electricity & Electric Circuits
Solution
The symbol −10X used to represent which of the particles?
A
Proton
B
Neutron
C
Electrons
D
Atoms
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Electron: A sub–atomic particle haring a negative charge and orbiting the nucleus (note: the symbol 0–1e represent the particle of an electrons.)
Source: Myschool Past Questions Archive (Record #40871)