Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 1501–1515 of 5315 verified questions
Sort by:
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
Water is unsuitable for use as a thermometric liquid because it
A
expands unevenly between 0oC and 40oC
B
has narrow temperature range
C
has a concave meniscus
D
maintains a fixed density
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Water's freezing point is 0^\circC and its boiling point is 100^\circC at standard atmospheric pressure, which provides a limited temperature range for measurement compared to other liquids used in thermometers. Other liquids like mercury can measure a wider range of temperatures.
Source: Myschool Past Questions Archive (Record #45446)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Diagram
Solution
The diagram above illustrates a block ans tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E
Attached Figure / Diagram
A
22.2N
B
38.0N
C
67.0N
D
75.0N
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Given; VR = 6, e = 75%, MA = ?
e = \(\frac{\text{MA}}{\text{VR}} \times \frac{100}{1}\)
MA =\(\frac{75 \times 6}{10}\)
MA = \(\frac{9}{2}\)
MA = \(\frac{L}{E} = \frac{100}{E}\)
\(\frac{9}{2} = \frac{100}{E}\)
9E = 100
E = \(\frac{200}{9}\)
= 22.2N
Source: Myschool Past Questions Archive (Record #45449)
Physics
WAEC / WASSCE 2015
Thermal Physics
Solution
A quantity of hot water at 100oC is added to 400g of water at 10oC until the temperature of the mixture is 60oC.
Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]
A
200g
B
320g
C
400g
D
500g
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Heat lost by hot water = Heat gained by cold water
M x 4200 x (100 - 60 = 0.4 x 4200 x (60 - 10)
4200m x 40 = 0.4 x 4200 x 50
40m = 0.4 x 50
m = \(\frac{0.4 \times 50}{40}\) = 0.5kg
= 500g
Source: Myschool Past Questions Archive (Record #45450)
Physics
WAEC / WASSCE 2015
Electricity and Magnetism
Diagram
Solution
A battery of emf 24V is connected to three resistor P, Q and R as illustrated in the diagram. Determine the voltage across the resistor Q
Attached Figure / Diagram
A
5v
B
10v
C
14v
D
24v
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
E - V1 + V2
24V = 14V + VQP
VQP = 4 + 14V
VQP =10V
Source: Myschool Past Questions Archive (Record #45452)
Physics
WAEC / WASSCE 2015
Waves and Optics
Red light travels faster than blue light when both of them pass through a glass prism because the
A
refractive index of red light is grester than that of blue light
B
refractive index of blue light is greater than that of red light
C
red light is more intense than the blue light
D
blue light is more intense than the red light
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 #45516)
Physics
WAEC / WASSCE 2015
Waves and Optics
Solution
An object is placed 20cm from a concave mirror of focal length 15cm. Calculate the linear magnification of the image formed
A
0.5
B
1.5
C
2.0
D
3.0
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(\frac{1}{U} + \frac{1}{V} = \frac{1}{F}\)
\(\frac{1}{V} = \frac{1}{F} - \frac{1}{U}\)
\(\frac{1}{V} = \frac{1}{15} - \frac{1}{20}\)
\(\frac{1}{V} = \frac{\text{4 - 3}}{60}\)
\(\frac{1}{V} = \frac{1}{60}\)
V = 60cm
M = \(\frac{V}{U} = \frac{60}{20}\)
M = 3.0cm
Source: Myschool Past Questions Archive (Record #45523)
Physics
WAEC / WASSCE 2015
Waves and Optics
All electromagnetic waves in a vacuum have the same
A
wavelength
B
frequency
C
speed
D
amplitude
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 #45526)
Physics
WAEC / WASSCE 2015
Electricity and Magnetism
Diagram
The diagram given illustrates two charged particles W and X. The charges on W and x are respectively
Attached Figure / Diagram
A
negative; negative
B
negative; positive
C
positive; positive
D
positive; negative
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 #45531)
Physics
WAEC / WASSCE 2015
Waves and Optics
Solution
An alternating current supply is connected to an electric lamp which lights with the same brightness as it does with direct current source emf 6v. The peak potential difference of the a.c supply is
A
4.6v
B
6.0v
C
8.5v
D
12.0v
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Vo = V\(\_{rms}\) x \(\sqrt{2}\)
Vo = 6 x 1.414
Vo = 8.484
= 8.5v
Source: Myschool Past Questions Archive (Record #45536)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance 20\(\Omega\). Calculate the power loss in the cable.
A
120 w
B
360 w
C
720 w
D
2400 w
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Power - IV
I = \(\frac{P}{V}\)
= \(\frac{12000}{2000}\)
I = 6A
Power loss = I\(^2\)R = 6\(^2\) x 20
= 720 W
Source: Myschool Past Questions Archive (Record #45546)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following statements is correct? When capacitors of different values are connected in series
A
the same charge flows through them
B
the same voltage appears across each capacitor
C
different quantities of charges flow through them in different voltages across them
D
different quantities of charges flows through them with the same voltage across them
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 #45547)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following statements about a three-pin plug is/are correct. i. The brown wire is the live wire. ii. The fuse is connected to the live wire. iii. The earth wire is coloured blue
A
i only
B
ii only
C
i and ii only
D
i, ii and iii
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 #45548)
Physics
WAEC / WASSCE 2015
Electricity and Magnetism
Solution
A wire of cross-sectional area 0.60mm2 has a restivity of 7.2 x 10-7 \(\Omega\). Calculate the length of wire that will have a resistance of 3\(\Omega\).
A
0.25m
B
2.50m
C
3.60m
D
36.00
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
R = \(\frac{PL}{A}\)
C = \(\frac{RA}{P}\)
C = \(\frac{0.60 \times 10^{-6} \times 3}{7.2 \times 10^{-7}}\)
C = 2.50m
Source: Myschool Past Questions Archive (Record #45553)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
in a nuclear fission process, the mass defect was 1.2 x 10-5kg. Calculate the energy released. [speed of the light in vacuum = c = 3.0 x 108ms-1]
A
1.08 x 1011J
B
5.20 x 1011J
C
1.08 x 1012J
D
2.50 x 1013J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
E - Mec2
E = 1.2 x 10-5 x (3 x 108)2
E = 1.08 x 1012J
Source: Myschool Past Questions Archive (Record #45567)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following statements about diode is correct?
A
reverse bias diodes have low resistance
B
forward bias diodes have high resistance
C
forward bias diodes produce high current
D
forward bias diodes function as a result of heat
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #45569)