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Physics
NECO SSCE 2000
Heat Energy & Temperature
In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum.
A
0.14s
B
0.43s
C
2.32s
D
2.40s
E
6.97s
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 #42731)
Physics
NECO SSCE 2000
Thermal Physics
Solution
The clinical thermometer differs from other mercury-in-glass thermometers because it has
I. a constriction
II. a wide range
III. a short range
IV. a narrow bore.
Which of the above are correct?
A
I and II only
B
I and III only
C
III and IV only
D
I,II and III only
E
I, III and IV only
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Correct features of a clinical thermometer (that differ from ordinary mercury-in-glass thermometers):
- I. A constriction — Yes (the kink just above the bulb prevents mercury from falling back on its own after removal from the body).
- III. A short range — Yes (typically 35^\circC to 42^\circC or 43^\circC, suitable only for human body temperature).
Thus, only I and III are correct for what makes the clinical thermometer different.
Source: Myschool Past Questions Archive (Record #42733)
Physics
NECO SSCE 2000
Electricity and Magnetism
If a positively charged glass-rod is used to charge an electroscope X by contact and an electroscope Y by induction, then
A
X and Y will be negatively charge
B
X and Y will be positively charged
C
X will be negatively charged and Y positively charged
D
X will be positively charged and Y negatively charged
E
X will be positively charged and Y will remain uncharged
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 #42737)
Physics
NECO SSCE 2000
Waves and Optics
A wave travels a distance of 20 cm in 3s. The distance between successive crests of the wave is 4cm. What is the frequency of the wave?
A
0.60Hz
B
1.67Hz
C
7.50Hz
D
15.00Hz
E
26.67Hz
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 #42740)
Physics
NECO SSCE 2000
Heat Energy & Temperature
The unit of inductance is
A
Weber
B
Telsa
C
Hertz
D
Henry
E
Farad
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 #42741)
Physics
NECO SSCE 2000
Waves and Optics
Solution
A man at the back of a crowd watches a parade by holding a plane mirror just above his head. The parade passes 6 metres behinde his head and the mirror is 0.25m in front of the man. How far does the image in the mirror appear to be from the man?
A
6.50m
B
6.25m
C
6.00m
D
5.75m
E
5.50m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
In a plane mirror, the image is formed as far behind the mirror as the object is in front of it.
- The parade (object) is 6 m behind the man’s head.
- The mirror is held 0.25 m in front of the man.
So, the total distance from the parade to the mirror is:
6 m + 0.25 m = 6.25 m.
The image will therefore appear 6.25 m behind the mirror.
The man is looking into the mirror, so the distance from the man to the image is:
Distance from man to mirror + Distance from mirror to image
= 0.25 m + 6.25 m
= 6.50 m
Thus, the image of the parade appears to be 6.50 metres from the man.
Source: Myschool Past Questions Archive (Record #42742)
Physics
NECO SSCE 2000
Mechanics and Properties of Matter
Solution
To keep a lorry moving at a constant speed v, requires power p, from the engine. The force provided by the engine is
A
\(\frac{1}{2}\)v
B
pv
C
\(\frac{p}{v}\)
D
pv2
E
\(\frac{p}{v^2}\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Power(p) = Force(F) x velocity(v)
F = \(\frac{\text{power}}{\text{velocity}}\)
Source: Myschool Past Questions Archive (Record #42748)
Physics
NECO SSCE 2000
Electricity and Magnetism
An electric iron rated 250 V has a coil of resistance 125Ω. What is the cost of using it for I hour at 10k per kWh?
A
1.25k
B
2.50k
C
5.00k
D
10.00k
E
20.00k
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 #42752)
Physics
NECO SSCE 2000
Waves and Optics
Solution
The image formed by a converging lens of focal length is of a distance of 2f from the lens. Calculate the lateral magnification produced
A
0.5
B
1
C
1.5
D
2
E
3
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Using the lens formula,
\(\frac{1}{v} + \frac{1}{u} = \frac{1}{f}\)
Where u, v and f are the object distance, image distance and focal length respectively.
\(\therefore \frac{1}{2f} + \frac{1}{u} = \frac{1}{f}\)
\(\frac{1}{u} = \frac{1}{2f} - \frac{1}{f} \implies \frac{1}{u} = \frac{1}{2f}\)
\(u = 2f\)
\(\therefore Magnification = \frac{\text{image distance}}{\text{object distance}}\)
= \(\frac{2f}{2f}\)
= 1
Source: Myschool Past Questions Archive (Record #42755)
Physics
NECO SSCE 2000
Waves and Optics
If the first position of resonance in a resonance tube is 18.0cm from the open end, the distance from the open end to the next position of resonance will be
A
24.0cm
B
27.0cm
C
36.0cm
D
45.0cm
E
54.0cm
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 #42770)
Physics
NECO SSCE 2000
Electricity and Magnetism
Solution
Calculate the peak voltage of a mains supply of r.ms. value 220V.
A
121 V
B
156 V
C
225 V
D
240 V
E
311 V
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
To calculate the peak voltage (\(V_p\)) from the root mean square (RMS) voltage (\(V_{rms}\)), we use the formula:
\(V_p = V_{rms} \times \sqrt{2}\)
Given:
\(V_{rms} = 220 \, \text{V}\)
Calculate the Peak Voltage
\(V_p = 220 \, \text{V} \times \sqrt{2} \approx 220 \, \text{V} \times 1.4142 \approx 311.1 \, \text{V}\)
The peak voltage is approximately:
311 V
Source: Myschool Past Questions Archive (Record #42771)
Physics
NECO SSCE 2000
Electricity and Magnetism
Two 2.0Ω resistors can be combined circuit to give an overall resistance of
A
0.5Ω only
B
1.0 Ω only
C
either 0,5Ω or 1.0 Ω
D
either 1.0Ω or 4.0 Ω
E
either 0.5Ω, 1.0Ω or 4.0Ω
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 #42775)
Physics
NECO SSCE 2000
Heat Energy & Temperature
An astronomical telescope which is being used to view a very distant object is said to be in normal adjustment if
A
the final image is at the near-point
B
the image formed by the objective is before the focus of the eye piece
C
the angular magnification is the ratio of the focal length of the eye-piece lens to that of the objective
D
the foci dl the objective and the eye-piece coincide between the lenses
E
the distance between the objective lens and the eye-piece is equal to the difference between their focal lengths.
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 #42778)
Physics
NECO SSCE 2000
Mechanics and Properties of Matter
A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches him 3s later. Calculate the velocity of sound in air.
A
170 ms-1
B
340 ms-1
C
680 ms-1
D
765 ms-1
E
1530 ms-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 #42781)
Physics
NECO SSCE 2000
Waves and Optics
The image is a plane mirror is
A
inverted, real with a magnificant of \(\frac{1}{2}\)
B
inverted, virtual with a magnification of 1
C
inverted, real with a magnification of 2
D
upright, virtual with a magnificent of 1
E
upright, real with a magnification of 2
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 #42785)