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Physics
NECO SSCE 2000
Reflection, Refraction & Dispersion of Light
Solution
The image obtained on the screen of a pin-hole camera becomes less sharply defined when the
A
object is moved farther from the pin-hole
B
screen is moved farther from the pin-hole
C
object is made smaller
D
illumination is made more intense
E
pin-hole is made larger.
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
In a pinhole camera, a very small pinhole produces a sharp image because light rays from each point on the object pass through a single tiny opening and hit the screen in a small, focused area.
When the pinhole is made larger, rays from the same object point can travel through different parts of the hole and spread out over a wider area on the screen. This results in blurred spots (larger circles of confusion) instead of sharp points, making the image less sharply defined.
Although a larger pinhole allows more light and makes the image brighter, it sacrifices sharpness.
Source: Myschool Past Questions Archive (Record #42795)
Physics
NECO SSCE 2000
Calorimetry, Latent Heat & Change of State
Solution
Which of the following statements about evaporation and boiling is FALSE?
A
Evaporation may take place at any temperature.
B
In evaporation, vapour escapes only from the surface of a liquid
C
The temperature remains constant as long as the liquid is boiling
D
The temperature at which boiling takes place can be altered by changing the external pressure
E
The rate of evaporation does not depend on temperature.
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Differences between Evaporation and Boiling
Evaporation
Boiling
Evaporation is a normal process that occurs when the liquid form changes into the gaseous form; while causing an increase in the pressure or temperature.
Boiling is an unnatural process where the liquid gets heated up and vaporized due to continuous heating.
Evaporation usually occurs on the heated liquid’s surface.
Boiling usually occurs on the entire mass of the heated liquid.
The bubbling effect is not visible in evaporation.
The bubbling effect is visible during the process of boiling.
produces a cooling effect.
does not produce a cooling effect.
The process of evaporation is slow.
The process of boiling is much quicker.
Source: Myschool Past Questions Archive (Record #42797)
Physics
NECO SSCE 2000
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following is/areNOT affected by a magnetic field?
I. Alpha particle
II. Cathode rays
III. Neutrons
A
I only
B
II only
C
III only
D
I and II only
E
I,II & 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 #42800)
Physics
NECO SSCE 2000
Units, Measurements & Dimensional Analysis
The smallest unit on the sleeve of a micrometer screw gauge is 0.5mm. There are fifty divisions on the thimble of the screw gauge.
What is the smallest length that can be measured with this instrument?
A
0.05cm
B
0.01cm
C
0.005cm
D
0.001cm
E
0.0001cm
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 #42803)
Physics
NECO SSCE 2000
Current Electricity & Electric Circuits
The length of a side of a metallic cube at 20° C is 5.0cm. Given that the linear expansively of the metal is 4.0 × 10-5K-1, find the volume of the cube at 120° C
A
124.50cm3
B
125.00cm3
C
126.00cm3
D
126.25cm3
E
126.50cm3
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 #42805)
Physics
NECO SSCE 2000
Linear Motion, Projectiles & Kinematics
A boy moving with a velocity of 3 ms-1 is brought to rest by a constant force after travelling 15m. Calculate the retardation.
A
0.15ms-2
B
0.30ms-2
C
0.60ms-2
D
3.33ms-2
E
6.66ms-2
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 #42806)
Physics
NECO SSCE 2000
Current Electricity & Electric Circuits
Solution
A block of a substance X will sink in a liquid V but float liquid Z. Which of the following statements is NOT correct about the densities of the three substances?
A
Density of liquid Z is greater than that of X
B
Density of liquid V is less than that of liquid X
C
Density of liquid Y is less than that of liquid Z
D
Liquid Z has the greatest density of all the three substances.
E
If liquids V and Z do not mix, liquid Z will float on liquid V.
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The density of liquid Y is less than that of liquid Z.
Source: Myschool Past Questions Archive (Record #42807)
Physics
NECO SSCE 2000
Scalars, Vectors & Relative Motion
Solution
I. A scalar quantity has only magnitude
II. A scalar quantity has both magnitude and direction
III. A vector quantity has both magnitude and direction
IV. A vector quantity has only magnitude.
Which of the above statement is/are correct?
A
I only
B
l and II only
C
l and III only
D
II and III only
E
II and III only
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
A scalar quantity has a magnitude only, which means it tells you how much of something there is, but it does not provide any information about direction.e.g temperature.
A vector quantity includes both magnitude and direction. This means it tells you how much and also which way something is happening. e.g velocity
Therefore, I and III are correct.
Source: Myschool Past Questions Archive (Record #42808)
Physics
NECO SSCE 2000
Current Electricity & Electric Circuits
An electric bell operated within an evacuated bell jar enables us to infer correctly that
A
light waves require a medium for transmission
B
sound waves do not require a medium for transmission
C
light waves do not require a medium for transmission but sound waves do
D
light waves travel much faster than sound waves
E
light waves and sound waves travel at the same speed
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 #42809)
Physics
NECO SSCE 2000
Units, Measurements & Dimensional Analysis
A boy ran a distance of 200m in 24s. His average speed was 8.3ms-1. Which of the following is correct about the units in which the statements above are expressed?
A
All the units are fundamental.
B
All the units are derived
C
All the units except one are S.I units
D
Two of the units are fundamental and one derived.
E
None of the units is S.I units.
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 #42810)
Physics
NECO SSCE 2000
Units, Measurements & Dimensional Analysis
A boy ran a distance of 200m in 24s. His average speed was 8.3ms-1. Which of the following is correct about the units in which the statements above are expressed?
A
All the units are fundamental.
B
All the units are derived
C
All the units except one are S.I units
D
Two of the units are fundamental and one derived.
E
None of the units is S.I units.
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: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2000
Work, Energy, Power & Simple Machines
Solution
A body of mass 0.6kg is thrown vertically upward from the ground with a speed of 20ms\(^{-2}\). Calculate its;
(i) potential energy at the maximum height reached.
(ii) kinetic energy just before it hits the ground.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Kinetic energy at point of projection = \(\frac{1}{2} mv^2 \times 0.6 \times 20^2\) = 120J
or
V\(^2\) = U\(^2\) - 2gs
S = \(\frac{v^2 - U^2}{-2g}\) = \(\frac{0^2 - 2062}{-2 \times 10}\)
= 20cm
P.E. = mgs or mgh 0.6 x 10 x 20 = 120J
ii) Kinetic energy in reaching ground = Potential energy at highest point = 120J.
Source: Myschool Past Questions Archive (Record #54134)
Physics
WAEC / WASSCE 2000
Linear Motion, Projectiles & Kinematics
Solution
What is a projectile? Give four examples of projectiles in everyday life
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
A projectile is an object or body launched into the air and allowed to move on its own or moving freely under gravity. Examples are - a shot arrow, a thrown javeline, a fired bullet, a kicked football etc.
Source: Myschool Past Questions Archive (Record #54135)
Physics
WAEC / WASSCE 2000
Elasticity, Density, Pressure & Fluids
Solution
a) Define the term surface tension
(b) Calculate the force required to lift a needle 4cm long off the surface of water if the surface tension of water is 7.3 x 10\(^{-4}\) NM\(^{-1}\)
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
a) Surface tension is defined as a force per unit length perpendicular to any line on the surface of the liquid OR Property of a liquid which makes the surface of liquid behave like an elastic skin.
(b) Surface tension =\(\frac{F}{2L}\)
F = 7.3 x 1\(^{-2}\) x 2 x 0.04 = 5.8 x 10\(^{-3}\)N
Source: Myschool Past Questions Archive (Record #54136)
Physics
WAEC / WASSCE 2000
Current Electricity & Electric Circuits
Solution
State any three properties of matter which are common to all substances.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(i) Matter is made up of tiny particles, molecules or atoms
(ii) Matter occupies space
(iii) Matter possesses inertia, mass or weight
(iv) Matter exerts pressure.
Source: Myschool Past Questions Archive (Record #54137)