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Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
Which of the following is a stringed instrument?
A
Flute
B
Trumpet
C
Piano
D
Drum
E
Organ
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 #26266)
Physics
WAEC / WASSCE 1994
Heat Energy & Temperature
Solution
The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?
A
330
B
238
C
146
D
119
E
73
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
238 - 92 = 146
Source: Myschool Past Questions Archive (Record #26273)
Physics
UTME / JAMB 1994
Heat Energy & Temperature
Solution
A boat travels due east at a speed 40ms\(^{-1}\)s across a river flow due south at 30ms\(^{-1}\)s. What is the resultant speed of the boat?
A
1.3ms-1
B
10.0ms-1
C
50.0ms-1
D
70.0ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
R\(^2\) = 40\(^2\) + 30\(^2\)
= 1600 + 900 = 2500
R = \(\sqrt{2500}\) = 50m/s
Source: Myschool Past Questions Archive (Record #27859)
Physics
UTME / JAMB 1994
Heat Energy & Temperature
Solution
A motor vehicle is brought to rest from a speed of 15ms-1 in 20 seconds. Calculate the retardation.
A
0.75ms-1
B
1.33ms-2
C
5.00ms-2
D
7.50ms-2
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Retardation = \(\frac{u - v}{t}\)
= \(\frac{15 -0}{20}\)
= 0.75ms-1
Source: Myschool Past Questions Archive (Record #27861)
Physics
UTME / JAMB 1994
Heat Energy & Temperature
Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, Which of the following observations is correct
A
The two kettles will cool down at the same rate
B
the polished kettle cools down more quickly by conduction
C
the kettle covered with soot cools down more quickly because it is a good radiator
D
the kettle covered with soot cools down more quickly by the process of heat convection
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 #27913)
Physics
UTME / JAMB 1994
Heat Energy & Temperature
In the curve above, PQRST represents an alternating voltage of frequency 50Hz. The time interval between points P and R on the graph is
A
25s
B
1/50s
C
1/100s
D
1/200s
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: Official Exam / Past Question Archive
Physics
UTME / JAMB 1994
Heat Energy & Temperature
Solution
An object is placed directly below a glass block of thickness 3.0cm. Calculate the lateral displacement of the object if the refractive index of the glass is 1.5.
A
1.0cm
B
1.5cm
C
2.0cm
D
2.5cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
1.5 = \(\frac{3}{\text {apparent displacement}}\)
Apparent depth = 2cm
displacement = 3 - 2
= 1cm
Source: Myschool Past Questions Archive (Record #27927)
Physics
UTME / JAMB 1994
Heat Energy & Temperature
Diagram
Solution
What is the reading of the vernier calipers shown above
Attached Figure / Diagram
A
1.79cm
B
1.73cm
C
1.39cm
D
1.34cm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
the vernier scale reading is the division on the vernier that tallies exactly with a division in the main scale
Source: Myschool Past Questions Archive (Record #41721)
Physics
UTME / JAMB 1994
Heat Energy & Temperature
Diagram
Solution
The fig above shows a uniform wood of weight 200Nand length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. calculate the tension in the cord if the wood is horizontal
Attached Figure / Diagram
A
10N
B
20N
C
100N
D
200N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Tension in the spring = Tsin 30
Taking a moment about the pivot
200 x 25 = T sin 30 x 50
5000 = T x 0.5 x 50 (since sin 30 = 0.5)
5000 = T x 25
T = \(\frac{5000}{25}\) = 200N
Source: Myschool Past Questions Archive (Record #41722)
Physics
WAEC / WASSCE 1993
Heat Energy & Temperature
Which of the following is a derived unit?
A
Ampere
B
Kilogramme
C
Second
D
Ohm
E
Kelvin
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 #24995)
Physics
WAEC / WASSCE 1993
Heat Energy & Temperature
Solution
A body timed 20 oscillations of a certain pendulum three times and obtained 44.3s, 45.5s and 45.7s respectively. Calculate the mean period of oscillation of the pendulum
A
0.13s
B
2.22s
C
2.26s
D
44.30s
E
45.17s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\text{Given times: } 44.3 \, \text{s}, \, 45.5 \, \text{s}, \, 45.7 \, \text{s}\)
Sum the total times:
\(\text{Total time} = 44.3 + 45.5 + 45.7 = 135.5 \, \text{s}\)
Calculate the mean time for 20 oscillations:
\(\text{Mean time} = \frac{135.5 \, \text{s}}{3} = 45.17 \, \text{s}\)
Find the mean period of oscillation (for one oscillation):
\(\text{Mean period} = \frac{45.17 \, \text{s}}{20} = 2.2585 \, \text{s}\)
Thus, the mean period of oscillation of the pendulum is approximately 2.26 seconds.
Source: Myschool Past Questions Archive (Record #24996)
Physics
WAEC / WASSCE 1993
Heat Energy & Temperature
Solution
How far will a body move in 4 seconds if uniformly accelerated from rest at the rate of 2 ms-2?
A
32m
B
24m
C
16m
D
1.2m
E
5m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
S = ut + \(\frac{1}{2}\) at\(^2\) = 0 + \(\frac{1}{2}\) x 2 x 4\(^2\) = 16m
Source: Myschool Past Questions Archive (Record #25002)
Physics
WAEC / WASSCE 1993
Heat Energy & Temperature
Solution
A solid metal cube of side 10 cm is heated from
10oC to 60oC. lf the linear expansivity of the metal is 1.2 x 105K-1, calculate the increase in its volume.
A
0.6cm3
B
1.2 cm3
C
1.8 cm3
D
3.6 cm3
E
6.0cm3.
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Δv = 3αvΔθ = 3 x 1.2 x 10-5 x 1000
X(60 – 10) = 1.8cm
Source: Myschool Past Questions Archive (Record #25005)
Physics
WAEC / WASSCE 1993
Heat Energy & Temperature
An image which cannot be formed on a screen is said to be
A
inverted
B
real
C
virtual
D
erect
E
blurred
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 #25009)
Physics
WAEC / WASSCE 1993
Heat Energy & Temperature
In the normal use of a simple microscope, a person sees an
A
inverted, virtual and magnified image
B
erect, virtual and magnified image
C
erect, real and magnified image
D
inverted, real and magnified image
E
inverted and real image the same size as the object.
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 #25011)