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Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Diagram
The effective capacitance between points X and Y in the diagram below is 1.0μF, What is the value of the capacitance C, measured in micro-farad?
Attached Figure / Diagram
A
5.0μF
B
4.0μF
C
3.0μF
D
1.0μF
E
0.5μF
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 #25096)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Which of the following is a wind instrument?
A
Guitar
B
Organ
C
Violin
D
Piano
E
Harp
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 #25101)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Which of the following is not a product of nuclear fission?
A
Alpha particle
B
Beta particle
C
Gamma ray
D
X-ray
E
Neutron
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 #25107)
Physics
WAEC / WASSCE 1995
Heat Energy & Temperature
Which of the following cannot be explained by the molecular theory of matter?
A
Conduction
B
Radiation
C
Convection
D
Evaporation
E
Expansion
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 #25108)
Physics
UTME / JAMB 1995
Heat Energy & Temperature
Solution
When a ball rolls on a smooth level ground, the motion of its center is
A
translational
B
oscillatory
C
random
D
rotational
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
A ball rolling along a smooth surface observes translational motion at the center while the rest of the body rotates round the center.
Source: Myschool Past Questions Archive (Record #27753)
Physics
UTME / JAMB 1995
Heat Energy & Temperature
Total eclipse of the sun occurs when the
A
earth is between the moon and the sun
B
sun is between the moon and the earth
C
moon is between the sun and the earth
D
ozone layer is threatened
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 #27840)
Physics
UTME / JAMB 1995
Heat Energy & Temperature
Which of the following is required to convert a milliammeter to an ammeter?
A
A high resistance in parallel
B
A high resistance in series
C
A low resistance in parallel
D
A low resistance in series
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 #27855)
Physics
UTME / JAMB 1995
Heat Energy & Temperature
Solution
The resultant capacitance in the fig above is
A
15.0µF
B
9.8µF
C
1.3µF
D
0.8µF
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Capacitors in parallel = 4\(\mu\)f + 2 \(\mu\) f = 6\(\mu\) f
Capacitors in series =\(\frac{1}{C_{eff}}\) = \(\frac{1}{C_1} + \frac{1}{C_2} + \frac{1}{C_3} + \frac{1}{C_4}\)
\(\frac{1}{C_{eff}}\) = \(\frac{1}{2} + \frac{1}{3} + \frac{1}{6} + \frac{1}{4}\) = \(\frac{6 + 4 + 2 + 3}{12}\)
\(\frac{1}{C_{eff}}\) = \(\frac{15}{12}\)
C\(_{eff}\) = \(\frac{12}{15}\) = 0.8\(\mu\) f
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
Solution
(a) State the laws of electromagnetic induction
(b) Explain how one of the laws illustrates the principle of conservation of energy
(c)(i) Draw a labelled diagram of a simple d.c. electric motor and explain how it works.
(ii) State two reasons why the efficiency of an electric motor is less than 100%.
A
0\(cm^3\)
B
9\(cm^3\)
C
10\(cm^3\)
D
90\(cm^3\)
E
100\(cm^3\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
(a) Whenever there is a change in the magnetic flux linked with a circuit an electromotive force is induced, the strength of which is proportional to the rate of change of the flux linked with the circuit. Lenz's law states that the direction of the induced current is always such as to oppose the charge producing it.
(b) Lenz's law illustrates the law of conservation of energy. In this case mechanical energy i.e kinetic energy, due to the motion of the bar magnet is changed to electrical energy in the form of induced current.
(c)
A simple d.c. electric motor can supply direct current (d.c.) by using a split - ring commutator.The brush (-) touches one half of the split ring X while the other brush (+) touches the other half Y. As the coil rotates it cuts through the magnetic flux linking the magnets and current is induced which flows through the coil as shown in the diagram. As the coil rotates past the vertical Y moves round to touch (-) while X moves round to touch (+). This action reverses the connections to the external resistance connected to (-) and (+). The reverse happens when the current is just zero (coil vertical) so instead of the current reversing in the external resistance, it continues to flow in the same direction.
c(ii) (1) Part of the current is wasted in form of heat due to the resistance of the coil and this reduces efficiency;
(2) Friction between the moveable parts of the motor makes the efficiency to reduce.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
which of the following is a scalar quantity?
A
Tension
B
Weight
C
Impulse
D
Upthrust
E
Distance
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #26241)
Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
In which of the following simple machines is the effort applied between the load and the fulcrum?
A
Scissors
B
Pliers
C
Wheel barrow
D
Sugar tongs
E
Nutcrackers
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 #26244)
Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
Solution
A tap supplies water at 30°C while another supplies at 86°C. If a man wishes to bath with water at 44°C, calculate the ratio of mass of hot water to that of cold water required
A
1:3
B
3:1
C
3:7
D
7:3
E
15:8
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(M_Hc\theta_{H} = M_cc\theta_c\)
\(M_h(86-44) = M_c(44-30)\) thus giving 1:3
Source: Myschool Past Questions Archive (Record #26249)
Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
A hygrometer is an instrument used to measure
A
Dew point
B
Temperature
C
Relative density
D
Relative humidity
E
Vapour pressure
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 #26251)
Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
The inability of the eye to focus near objects is known as
A
Long sight
B
Astigmatism
C
Presbyopia
D
Glaucoma
E
Short sight
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 #26254)
Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
Which of the following is not a part of an A.C generator?
A
Carbon brushes
B
Slip rings
C
Commutator
D
Field magnet
E
Armature
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 #26258)