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Physics
UTME / JAMB 2017
Heat Energy & Temperature
Solution
If silicon is doped with phosphorus, what type of semiconductor material will be formed?
A
Zener material
B
P-n junction
C
n-type
D
p-type
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
When silicon is doped with a trivalent atom. A p-type semi-conductor will be formed when silicon is doped with a pentavalent atom such as arsenic, a n-type semi-conductor will be formed
Phosphorous is a pentavalent element, so it will produce a o -type semi-conductor
Source: Myschool Past Questions Archive (Record #46440)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
Which of the following statements about matter is not correct?
A
Molecules of solids move more freely than molecules of liquids and gases
B
Molecules of solids are more closely packed than those of liquids
C
Energy is required to break the intermolecular forces of attraction between molecules
D
Molecules of liquids move about within the liquid and they are in constant motion
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
All other properties of the different states of matter holds except that the molecules of solids don't move freely due to the fact that the particles in the solids are closely packed so it inhibits free motion.
Source: Myschool Past Questions Archive (Record #49916)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Which of the following processes is not a surface phenomenon?
A
Condensation
B
Evaporation
C
Photo Emission
D
Thermionic Emission
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #49946)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
The angle at which a projectile must be fired to cover maximum range is
A
30°
B
45°
C
60°
D
90°
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The formula is \(\frac{v^{2}sin2\theta}{g}\)
And the sine graph is highest at 1 with its inverse as 90^\circ. Hence, \(2\theta\) = 90^\circ
\(\theta\) = 45^\circ
Source: Myschool Past Questions Archive (Record #49961)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
A body can undergo the following types of motion except
A
random
B
rotational
C
translational
D
relative
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Relative motion is the calculation of the motion of an object with regard to some other moving object. Hence, relative motion is not a type of motion.
Source: Myschool Past Questions Archive (Record #49964)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
A vapour whose molecules are in dynamic equilibrium with those of its own liquid is said to be
A
unsaturated
B
gaseous
C
saturated
D
diffused
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
A saturated vapour is one which is in a dynamic equilibrium with its own liquid.
Source: Myschool Past Questions Archive (Record #49993)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
Which of the following statements about the 3rd overtone of a vibrating air column of an open pipe is correct? It has
A
4 nodes
B
5 nodes
C
3 antinodes
D
4 antinodes
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The 3rd overtone for an open pipe has 5 antinodes and 4 nodes.
Source: Myschool Past Questions Archive (Record #50010)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Which of the following pairs of concepts constitutes complementary variables as expressess by the Heinsberg uncertainty principle?
A
Momentum and time
B
Energy and acceleration
C
Position and momentum
D
Velocity and Momentum
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #50095)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
The nucleon number of an atom is the total number of
A
electrons and protons
B
electrons and neutrons
C
neutrons minus electrons
D
protons and neutrons
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #50096)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Which of the following statements is/ are correct?
I. Gravitational potential due to a mass at a point a distance r away is proportional to \(r^{2}\)
II. Gravitational field strength is a vector quantity
III. Gravitational intensity is proportional to the weight of a unit mass.
A
I, II and III
B
III only
C
II only
D
I only
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #50065)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
A particle is dropped from a vertical height h and falls freely for a time t. With the aid of a sketch, explain how h varies with \(t^2\)
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
.
Source: Myschool Past Questions Archive (Record #52881)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
A particle is projected horizontally at 15ms\(^{-1}\) from a height of 20m. Calculate the horizontal distance covered by the particle just before hitting the ground. [g= 10ms\(^{-2}\)]
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Let R represent the horizontal distance covered at time t.
Using h = ut + \(\frac{1}{2}gt^2\)
but U\(_v\) = 0
h = \(\frac{1}{2} gt^{2}\)
20 = \(\frac{1}{2} \times 10 \times t^2\)
20 = 5t\(^2\)
t\(^2\) = \(\frac{20}{5}\) = 4
t = 2s
Range(R) = U\(_x\) x t
= 15 x 2
= 30m
or
R = u x \(\sqrt{\frac{2h}{g}}\)
= 15 x \(\sqrt{\frac{2 \times 20}{10}}\)
= 15 x \(\sqrt{4}\)
= 15 x 2
= 30m
Source: Myschool Past Questions Archive (Record #52882)
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
List three phenomena which can be explained by the molecular theory of matter.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(i) Osmosis
(ii) Brownian motion
(iii) Diffusion
(iv) Capilarity
(v) Viscosity
Source: Myschool Past Questions Archive (Record #52883)
Physics
UTME / JAMB 2017
Heat Energy & Temperature
Which of the following is not true of an electrical charge?
A
Negative charge means deficit electrons
B
Negative charge means excess of electrons
C
electric current means movement of electrons
D
All of the above
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2017
Heat Energy & Temperature
Solution
You are provided with cells, a potentiometer, an ammeter, a voltmeter, a bulb, a key, a jockey, and other necessary materials.
i. Measure and record the e.m.f E of the battery.
ii. Set up a circuit as shown in the diagram above.
iii. Close the key K and use the jockey to make a firm.
iii. Contact at J on the potentiometer wire such that PJ = x= 10cm.
iv. Take and record the voltmeter reading V and the () Corresponding ammeter reading.
v. Evalute log V and log I.
vi. Repeat the procedure for five other values of x = 20 cm, 30 cm, 40 cm, 50 cm, and 60 cm.
vii. Tabulate your readings.
viii. Plot a graph with log I on the vertical axis and log V on the horizontal axis.
ix. Determine the slope s, of the graph.
x. Determine the intercept, c, on the vertical axis.
xi. State two precautions taken to ensure accurate results.
(b)i. How is the brightness of the bulb affected as x increases?
ii. List two electrical devices whose actions do not obey Ohm's law.
A
Visible, ultraviolet, X-ray
B
X-ray, visible, ultraviolet
C
Ultraviolet, visible, X-ray
D
X-ray, ultraviolet, visible
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
S/N
I/A
V/V
LogV/V
LogI/A
1.0
0.10
0.30
-0.552
-1.000
2.0
0.15
0.50
-0.301
-0.823
3.0
0.20
0.70
-0.154
-0.698
4.0
0.25
0.80
-0.096
0.602
5.0
0.30
0.90
-0.045
0.522[
Slopes S = \(\frac{\bigtriangleup \text{logI}}{\bigtriangleup \text{logV}}\) = \(\frac{\text{logl}_{2}} {\text{logV}_{2}}\) - \(\frac{\text{logl}_{1}}{\text{logV}_{2}}\)
S = \(\frac{-1.00 - (-0.70)}{-0.15 - (0.50)}\) = \(\frac{0.30}{0.10}\)
S= 3
PRECUATIONS
1. avoided parallax error when reading ammeter and voltmeter
2. opened the key when readings are not being taken to ensure that the cells do not run down.
3. ensured that the jockey is not dragged along the potentiometer wire.
(b)i. As x increases, the brightness of the bulb increases. As x increases, voltage and current through the bulb also increases, hence brightness increases
ii. Electrical devices whose action does not obey ohm's law. They are: Diode, Capacitor, Transistor, Thermistor and Thyristor.
SEE GRAPH ABOVE
Source: Official Exam / Past Question Archive