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Physics
NECO SSCE 2000
Waves and Optics
Which of the following is/are TRUE of nuclear fission?
I. A heavy nucleus is split into two nuclei of comparable masses
II. Two light nuclei are joined together to form a heavier nucleus
III. The total mass of the products is less than that of the reactants
A
I only
B
II only
C
III only
D
I and III only
E
II and III only
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 #42792)
Physics
NECO SSCE 2000
Waves and Optics
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
Mechanics and Properties of Matter
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
Electricity and Magnetism
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Mechanics and Properties of Matter
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
Mechanics and Properties of Matter
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
Mechanics and Properties of Matter
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
Electricity and Magnetism
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Biology
NECO SSCE 2000
Science of Living Things
The streaming movement of cytoplasm observed in a freshly cut leaf of a water plant is termed
A
amoeboids
B
centrifugal motion
C
ciliary motion
D
cyclosis
E
osmosis
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #41765)
Biology
NECO SSCE 2000
Science of Living Things
Solution
Which of the following sequences best illustrates a food chain in an aquatic habitat ?
A
algae → fungi → toad → snake
B
diatoms → tadpole → fish → kingfisher
C
grass → grasshopper → toad → whale
D
phytoplankton → fish → snake → kingfisher
E
zooplankton → tadpoles → fish → kingfisher
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The food chain Diatoms → Tadpole → Fish → Kingfisher does illustrate an aquatic food chain, showing energy flow from producers (diatoms) through primary (tadpole eats algae/detritus), secondary (fish eats tadpole/invertebrates), and tertiary consumers (kingfisher eats fish) in a water-based habitat.
Source: Myschool Past Questions Archive (Record #41766)
Biology
NECO SSCE 2000
Science of Living Things
Solution
The process which ensures that the chromosome number for each species of organism remains constant from generation to generation is called
A
fission
B
fusion
C
meiosis
D
mitosis
E
oogenesis
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Meiosis ensures that the chromosome number remains constant from generation to generation in sexually reproducing organisms. During meiosis, the chromosome number of a cell is reduced to half, resulting in the formation of gametes (sperm and egg cells) with a haploid number of chromosomes. When these gametes fuse during fertilization, the original chromosome number is restored in the offspring.
While both mitosis and meiosis contribute to maintaining a constant chromosome number across generations, they do so in different ways. Mitosis ensures that the number of chromosomes remains the same in somatic cells, while meiosis reduces the chromosome number by half in germ cells to prevent doubling of chromosomes during fertilization. Meiosis ensures that the chromosome number remains constant by reducing it in gametes and then restoring it through fertilization, while mitosis maintains the same chromosome number within individual organisms.
Source: Myschool Past Questions Archive (Record #41767)