Waraqaalee qormaataa

Qormaata galuumsa kutaa 12ffaa Fiiziksii, bara 2018 A.L.I (2026), maxxansa 1

Gaaffilee dhugaa qormaata galuumsa yunivarsiitii kutaa 12 kan Fiiziksii, akkuma barattoonni bara 2018 A.L.I itti fudhatanitti. Tokkoon tokkoon gaaffii deebii sirrii fi ibsa qaba. Qormaanni bara 2018 A.L.I maxxansa adda addaatiin bahe. Fuulli kun maxxansa 1 qaba; kaan gadi aanee tarreeffamaniiru.

Bilisaan shaakaluu jalqabaa Waraqaa gaaffii

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Eenyutu fudhata
2018 A.L.I (2026), maxxansa 1
Bara qormaataa
Gaaffilee 46 deebii waliin
Kuusaa kana keessa

Gaaffilee qormaata kanaa yaalaa

Deebii banuun dura tokkoon tokkoon gaaffii ofii keessaniin deebisaa. Ibsi gara kutaa kitaaba barnootaa sirriitti waan qajeelchuuf, yeroo gaaffii dogoggortan fuula kam irra deebi'uu akka qabdan ni beektu.

Gaaffii 1

Which of the following is not true about uniform motion?

A.It covers equal interval of distance at equal interval of time in a fixed direction.
B.Its speed remains constant throughout its motion along straight line.
C.Its acceleration stays uniform throughout its motion on its way at a given time.
D.Its graph is a straight line with constant positive slope.

Deebii fi ibsa ilaalaa

Deebii: C Its acceleration stays uniform throughout its motion on its way at a given time.

Maaliif

Uniform motion means the velocity never changes. If the velocity never changes then the acceleration is zero at every moment, so describing the motion as having an acceleration that stays uniform does not fit. Options A and B are two ways of saying the speed and the direction stay the same, and D is the straight line a constant speed gives on a distance time graph. Option D is the one that tempts, because a sloping line looks like something is speeding up, but on a distance time graph a constant slope is what constant speed looks like.

Gaaffii 2

Two students walk from school to home. Student A takes a short cut in straight line, but student B follows the road which curves around a hill. Which one is true?

A.Student A has greater distance but the same displacement
B.Student B has greater distance but the same displacement
C.Student A has greater displacement but the same distance.
D.Both distance and displacement are the same for both students.

Deebii fi ibsa ilaalaa

Deebii: B Student B has greater distance but the same displacement

Maaliif

Displacement is the straight line from start to finish. Both students begin at the school and end at the same home, so their displacements are the same. Distance is the length of the path actually walked, and the road curving around the hill is longer than the straight short cut, so student B covers more distance. Option A says the right thing with the names swapped: A is the one who took the short cut, so A cannot be the one with the greater distance.

Gaaffii 5

Which statement is wrong about average velocity and instantaneous velocity?

A.Average velocity depends on total displacement, instantaneous velocity does not.
B.Average velocity and instantaneous velocity are equal when an object moves in straight line with constant velocity.
C.The speed shown on a speedometer at a moment represents instantaneous velocity.
D.The average velocity expresses motion of an object at specific moment in time.

Deebii fi ibsa ilaalaa

Deebii: D The average velocity expresses motion of an object at specific moment in time.

Maaliif

Instantaneous velocity is the velocity at one moment. Average velocity is the total displacement divided by the total time for a whole trip. Statement D hands the description of instantaneous velocity to average velocity, so D is the wrong one. Option A can look suspicious, but it is true: the average needs the whole displacement, while the instantaneous value needs only what is happening at that instant.

Gaaffii 6

If the force of attraction between two point masses at a distance r is 250N, what will be the new force if the distance between them decreases by quarter for the same masses? (G = 6.67×10⁻¹¹ Nm²/kg²)

A.1600N
B.8000N
C.4000N
D.1200N

Deebii fi ibsa ilaalaa

Deebii: C 4000N

Maaliif

Newton's law of gravitation gives

F = \frac{Gm_1m_2}{r^2}

, so the force depends on

1/r^2

. When the separation drops to a quarter,

r

becomes

r/4

, so

r^2

becomes

r^2/16

and the force becomes 16 times larger:

F' = 16 \times 250 = 4000\ \text{N}

. The value of

G

is not needed, because the masses do not change and only the ratio matters. Option B, 8000 N, would need the force to grow 32 times, and no reading of the change in distance gives that factor.

Gaaffii 7

All are dimensionless except

A.Specific gravity
B.Young's modulus
C.Strain
D.Index of refraction

Deebii fi ibsa ilaalaa

Deebii: B Young's modulus

Maaliif

Young's modulus is stress divided by strain. Strain is one length divided by another, so it carries no unit, which leaves Young's modulus with the unit of stress,

\text{N/m}^2

. The other three are all ratios of two like quantities: specific gravity compares two densities, strain compares two lengths, and the index of refraction compares two speeds. Option C, strain, is the tempting pick, but it is the very quantity whose lack of a unit is what gives Young's modulus its unit.

Gaaffii 8

Which of the following is necessarily true?

A.If the velocity of an object is zero, then acceleration is also zero.
B.If acceleration of an object is zero then its velocity is also zero.
C.Deceleration means that acceleration is necessarily negative.
D.The instantaneous acceleration has the same value as the average acceleration if the motion is uniformly accelerated motion.

Deebii fi ibsa ilaalaa

Deebii: D The instantaneous acceleration has the same value as the average acceleration if the motion is uniformly accelerated motion.

Maaliif

In uniformly accelerated motion the acceleration holds the same value at every moment, so the value at any instant equals the value averaged over any interval. That makes D true. A fails at the top of a thrown ball's flight, where the velocity is zero while gravity still pulls. B fails for a car at steady speed, where the acceleration is zero but the velocity is not. Option C is the tempting one: deceleration means the speed is falling, and for a body moving in the negative direction a positive acceleration is what slows it, so a deceleration is not always a negative acceleration.

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Qormaatilee Fiiziksii biroo bara 2018 A.L.I

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Yaadannoon gabaabaan Fiiziksii kutaa 12 kaardii 28 qaba. Tokkoon tokkoon boqonnaa boqonnaadhaan kitaaba biyyaalessaa irraa qophaa'ee seericha, mallattoowwan isaa maal bakka akka bu'an fi dogoggora qabxii nama dhabsiisu ni ibsa.

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Kunneen gaaffilee dhugaa qormaata galuumsa Fiiziksii bara 2018 A.L.I ti?

Eeyyee. Qormaata galuumsa yunivarsiitii biyyaalessaa kan Fiiziksii barattoonni bara 2018 A.L.I (2026) fudhatan irraa fudhataman. Kuusaan keenya gaaffilee isaa 46 qaba; tokkoon tokkoon isaanii deebii fi ibsa gara kitaaba barnootaatti qajeelchu qabu.

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