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Physics
WAEC / WASSCE 1996
Heat Energy & Temperature
The walls and ceilings of many standard auditoria are covered with perforated pads to
A
increase the intensity of sound waves
B
increase the loudness of sound waves
C
reduce the effect of reverberations of sound waves
D
increase the interference effect of sound waves
E
decrease the frequency of sound waves.
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 #25232)
Physics
WAEC / WASSCE 1996
Heat Energy & Temperature
The refractive index of a medium relative to air is 1.8. Calculate the critical angle for the medium to the nearest degree.
A
18o
B
34o
C
45o
D
68o
E
90o.
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 #25229)
Physics
WAEC / WASSCE 1996
Heat Energy & Temperature
Solution
Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?
A
Carbondioxide gas
B
Liquid sodium metal
C
Concrete shield
D
Graphite rods
E
Boron rods
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Graphite is commonly used as a moderator in nuclear reactors to slow down fast-moving neutrons, making them more likely to induce further fission reactions.
Source: Myschool Past Questions Archive (Record #25255)
Physics
WAEC / WASSCE 1996
Heat Energy & Temperature
Solution
(a) Explain the following terms:
(i) viscosity;
(ii) terminal velocity.
(b)(i) Describe an experiment to determine the terminal velocity of a steel ball falling through a jar of glycerine..
(ii) State two precautions that should be taken to ensure accurate result.
(c) State two
(i) effects of viscosity
(ii) applications of viscosity.
A
Radio wave
B
Gamma ray
C
Infra-red ray
D
Alpha particle
E
X-ray.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
(a)(i) Viscosity is the property of a fluid which tends to prevent or oppose motion of one layer or part over another. It varies with the temperature and nature of the fluid. (ii) A body falling through a fluid eventually attains a steady velocity called terminal velocity. At this point the weight of the body equals the upthrust and viscous force. (b)(i)
Description: A tall glass jar is filled with glycerine anJ supported vertically. Bands (acting as markers) are attached to points A.B.C.D.E and F at equal intervals. The ball is allowed to fall from the top of the jar while the time is noted as the ball passed each marker in turn. It will be observed that the time intervals between A and B, B and C are different while the time intervals for C and D, D and E, E and F are equal. Showing that a steady terminal velocity is reached from C. This ;Weans that
\(\frac{CD}{t} = \frac{DE}{t} = \frac{EF}{t}\) is the terminal velocity.
(ii) Precautions:
(1) Drop the ball gently.
(2) Ball must fall centrally down the glycerine
(c)(i) (1) Viscosity is responsible for the different rates of flow of fluid
(2) Viscosity affects motion of bodies in fluids.
(ii) (1) Viscous liquids are used as lubricants
(2) The knowledge of viscous drag is applied in the design of ships and aircraft.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Which of the following is a fundamental quantity?
A
Heat capacity
B
Electric current
C
Torque
D
Reactance
E
Density
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 #25053)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
A boy cycles continuously through a distance of 1.0 km in 5 minutes. Calculate his average speed
A
0.3ms-1
B
3.3ms-1
C
16.6ms-1
D
20.0ms-1
E
200.0ms-1
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 #25054)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
A student found out from a simple pendulum experiment that 20 oscillations were completed in 38 seconds. What is the period of oscillation of the pendulum?
A
8.0s
B
3.8 s
C
2.0 s
D
1.9 s
E
0.5s
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 #25055)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Solution
The angular speed of an object describing a circle of radius 4m with a linear constant speed of 10 ms-1 is
A
40.00 rad s-1
B
14.00 rad s-1
C
2.50 rad s-1
D
1.58 rad s-1
E
0.40 rad s-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
To find the angular speed (\( \omega \)) of an object moving in a circle, we use the formula:
\(\omega = \frac{v}{r}\)
Given:
- Linear speed (\( v \)) = 10 m/s
- Radius (\( r \)) = 4 m
Substituting the values into the formula:
\(\omega = \frac{10 \, \text{m/s}}{4 \, \text{m}} = 2.5 \, \text{rad/s}\)
The angular speed is \(\omega = 2.50 \, \text{rad/s}\)
Source: Myschool Past Questions Archive (Record #25057)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
At what angle to the horizontal must the nozzle of a machine gun be kept when firing to obtain a maximum horizontal range for the bullets?
A
0.0o
B
22.5o
C
30.0o
D
45. 0o
E
90.0o
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 #25058)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
A car travelling at a uniform speed of 120km h-1 passes two stations in 4 minutes. Calculate the distance between the two stations.
A
8km
B
15km
C
22km
D
30km
E
60km
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 #25060)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
A body weighing 10 N in air is partially immersed in water. It displaces water of mass 0.3 kg. What is the upthrust on the body? (g = 10 ms-2)
A
13.0 N
B
7.0 N
C
3.3N
D
3.0N
E
0.3 N.
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 #25062)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Solution
(a) Define the boiling it of a liquid.
(b) Describe with the a d. labelled diagram, an experiment to determire the boiling point of a small quantity of a liquid.
(c) factors that may affect the boiling point of a liquid
(d) Using the kinetic theory of matter, explain why pure water changes to steam at S.T.P. without any change in temperature, although heat is being supplied to the water.
A
Plastic
B
Wood
C
Textile
D
Aluminium
E
Lead
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
a) The boiling pointer of a liquid is the temperature at which its s.v.p. is equal to the external atmospheric pressure OR The temperature at which a (pure) liquid boils when the atmospheric pressure on it is 760 mm Hg. OR The temperature at which the liquid changes from the liquid to the gaseous state without change in temperature when the atmospheric pressure is normal (760mm Hg).
Method: Some mercury is introduced into J - tube and the entrapped air removed. Some liquid is introduced into the shorter length of the J - tube above the mercury. The beaker and its contents are heated and the water stirred continuously. At a stage when the levels of mercury in the two limbs of the J-tube are the same the temperature is read. At this temperature the s.v.p of the liquid is equal to the atmospheric pressure, and this temperature is the boiling point of the liquid. The process is repeated with the beaker and its contents cooling. The temperature at which the levels of mercury in the two limbs are equal is read and the mean of the two taken.
(c) Pressure on the liquid, impurities in the liquid.
(d) The extra heat supplied during boiling is used in breaking the intermolecular attractions and in mabling the steam expand or enabling the molecules move further apart against the atmospheric pressure. Hence, there is no change in temperature during the change of state.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Which of the following is not self-luminous?
A
Incandescent electric bulb
B
Incandescent fluorescent tube
C
Lighted candle
D
The moon
E
The sun
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 #25077)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Diagram
Calculate the inductance L of the coil in the circuit shown below.
Attached Figure / Diagram
A
14.4H
B
3.8H
C
0.6H
D
0.4H
E
0.2H
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 #25090)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Diagram
Calculate the inductive reactance of the circuit shown above.
Attached Figure / Diagram
A
50.00
B
5.00
C
0.50
D
0.05
E
0.02
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 #25092)