Pripremni Test Iz Fizike - VII Razred
Pripremni test iz fizike za učenike 7. Razreda. Rješavanjem ovog testa učenici se spremaju za testiranje na redovnoj nastavi iz sljedećih nastavnih tema: Interakcija Struktura supstancijeDA BI POČELI SA RJEŠVANJEM, UNESITE VAŠE IME I KLIKNITE TIPKU "Start"
Questions and Answers
- 1.
Mjerna jedinica za masu tijela je:
Explanation
The correct answer is "kilogram, kg" because the kilogram is the standard unit of measurement for mass. It is a metric unit and is used to measure the amount of matter in an object. The abbreviation "kg" is commonly used to represent the kilogram in scientific and everyday contexts.Rate this question:
- 2.
Mjerna jedinica za silu je:
Explanation
The correct answer is "njutn, N". The explanation is that the unit of force is called the newton, symbolized by the letter N. It is named after Sir Isaac Newton, a famous physicist who made significant contributions to the study of forces and motion. The newton is defined as the amount of force required to accelerate a one-kilogram mass at a rate of one meter per second squared.Rate this question:
- 3.
Mjerna jedinica za težinu tijela je:
Explanation
The correct answer is "njutn, N". This is because the unit of measurement for body weight is expressed in newtons (N).Rate this question:
- 4.
Mjerne jedinice za gustinu i zapreminu tijela su:
- A.
Kilogram po metru kubnom, kubni metar
- B.
Kilogram kroz metar na kvadrat, metar na treću
- C.
Kilogram po kubnom metru, metar kvadratni
Correct Answer
A. Kilogram po metru kubnom, kubni metarExplanation
The correct answer is "kilogram po metru kubnom, kubni metar." This is because the units for density are typically expressed as mass per unit volume, which is represented by "kilogram per cubic meter." The second part of the answer, "kubni metar," refers to cubic meter, which is a unit used to measure volume.Rate this question:
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- 5.
Gravitacionu silu izražavamo u Njutnima (N)!
- A.
TAČNO!
- B.
NETAČNO!
Correct Answer
A. TAČNO!Explanation
The given statement states that gravitational force is expressed in Newtons (N), which is correct. Newton is the unit of measurement for force, and gravitational force is measured in Newtons as it is a type of force. Therefore, the answer "TAČNO!" is correct.Rate this question:
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- 6.
Masa tijela je:
- A.
Mjera interakcije između tijela
- B.
Mjera inertnosti tijela
- C.
Mjera zapremine tijela.
Correct Answer
B. Mjera inertnosti tijelaExplanation
The correct answer is "mjera inertnosti tijela". Inertia is the property of an object to resist changes in its state of motion. The mass of an object is a measure of its inertia, meaning that objects with larger mass have greater resistance to changes in their motion. Therefore, mass is a measure of inertia of an object, and this is the most appropriate explanation for the given answer.Rate this question:
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- 7.
Ako je tijelo inertnije, onda možemo reći da ima:
- A.
Veću masu
- B.
Manju masu
Correct Answer
A. Veću masuExplanation
If a body is more inert, it means that it has a greater resistance to changes in its state of motion. This resistance is directly related to the mass of the body. Therefore, if a body is more inert, it implies that it has a greater mass.Rate this question:
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- 8.
Sila je fizička veličina potpuno određena:
- A.
Intenzitetom i pravcem
- B.
Intenzitetom i smjerom
- C.
Intenzitetom, pravcem i smjerom
- D.
Pravcem i smjerom
Correct Answer
C. Intenzitetom, pravcem i smjeromExplanation
The correct answer is "intenzitetom, pravcem i smjerom" (intensity, direction, and sense). This means that the quantity of force (intensity), the path along which it acts (direction), and whether it is a push or pull (sense) are all necessary to fully determine the physical quantity called force.Rate this question:
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- 9.
Mjera inertnosti tijela je:
- A.
Zemljina teža
- B.
Težina tijela
- C.
Gustina tijela
- D.
Masa tijela
Correct Answer
D. Masa tijelaExplanation
The correct answer is "masa tijela". Mjera inertnosti tijela refers to the measure of inertia of an object, which is directly related to its mass. Inertia is the property of an object to resist changes in its motion, and it is directly proportional to the mass of the object. Therefore, the mass of an object determines its inertia, making it the correct answer in this context.Rate this question:
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- 10.
Da li se brzina tijela mijenja kada se ono kreće po inerciji?
- A.
Da!
- B.
Ne!
Correct Answer
B. Ne!Explanation
When an object is moving in inertia, it means that no external force is acting on it. According to Newton's first law of motion, an object in motion will continue to move at a constant velocity unless acted upon by an external force. Therefore, the speed of the object will not change when it is moving in inertia. Hence, the correct answer is "Ne!" (No!).Rate this question:
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- 11.
Dječak je trčao, sapleo se i pao. Da li je pao naprijed ili nazad? Zašto?
- 12.
Privlačne sile između molekula istovrsnih čestica nazivaju se:
- A.
Sile adhezije
- B.
Sile kohezije
- C.
Nuklearne sile
Correct Answer
B. Sile kohezijeExplanation
The correct answer is "sile kohezije" (cohesive forces). These forces refer to the attractive forces between molecules of the same substance. They are responsible for holding the molecules together and creating surface tension. Adhesive forces, on the other hand, refer to the attractive forces between molecules of different substances. Nuclear forces, on the other hand, refer to the forces that hold atomic nuclei together.Rate this question:
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- 13.
Napisati kako glasi Prvi Njutnov zakon (zakon inercije)!
- 14.
Težina tijela je:
Correct Answer
sila kojom tijelo djeluje na horizontalnu podlogu ili zateže konac o koji je obješeno.
sila kojom tijelo (pod dejstvom zemljine teže) djeluje na horizontalnu podlogu ili zateže konac o koji je obješeno.Explanation
The correct answer is that the weight of an object is the force with which the object acts on a horizontal surface or pulls on a suspended string. This is because weight is the force exerted by gravity on an object, and it is directed towards the center of the Earth. When an object rests on a horizontal surface or is suspended by a string, the weight of the object is balanced by an equal and opposite force exerted by the surface or the string. Therefore, the weight of the object is the force with which it acts on the surface or the string.Rate this question:
- 15.
Sila Zemljine teže je:
Correct Answer
sila kojom Zemlja privlaći sva tijela
sila kojom Zemlja privlači sva tijela koja se nalaze na površini i iznad površine Zemlje.Explanation
The correct answer is the force with which the Earth attracts all objects, and the force with which the Earth attracts all objects that are located on the surface and above the surface of the Earth. This means that the Earth's gravitational force acts on all objects, regardless of their location in relation to the Earth's surface.Rate this question:
- 16.
Tri osnovna agregatna stanja su:
Correct Answer
čvrsto, tečno i gasovito
čvsto, tečno i gasno
gasovito, čvrsto i tečno
gasovito, tečno i čvrsto.Explanation
The correct answer is "čvrsto, tečno i gasovito". This answer correctly lists the three basic states of matter: solid, liquid, and gas.Rate this question:
- 17.
Koja od sljedećih tvrdnji nije tačna:
- A.
Molekuli formiraju atome
- B.
Atomi formiraju molekule
- C.
Elektroni se nalaze u atomskom omotaču
Correct Answer
A. Molekuli formiraju atomeExplanation
The correct answer is "Molekuli formiraju atome." This statement is not true because atoms form molecules, not the other way around. Molecules are formed when two or more atoms chemically bond together. Atoms, on the other hand, are the basic units of matter and cannot be broken down into smaller particles by ordinary chemical means. Elektroni se nalaze u atomskom omotaču (Electrons are located in the atomic shell) is a true statement as electrons are found in the electron shells or orbitals surrounding the nucleus of an atom.Rate this question:
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- 18.
U kojem agregatnom stanju su međumolekulske sile najjače:
- A.
Gasovitom
- B.
Tečnom
- C.
čvstom
Correct Answer
C. čvstomExplanation
U čvrstom agregatnom stanju, međumolekulske sile su najjače. U ovom stanju, molekule su blizu jedna drugoj i imaju snažne interakcije među sobom. Ove sile uključuju dipol-dipolne interakcije, vodikove veze i Londonove disperzijske sile. U gasovitom stanju, molekule su daleko jedna od druge i imaju vrlo slabe međumolekulske sile. U tečnom stanju, međumolekulske sile su jače nego u gasovitom stanju, ali slabije nego u čvrstom stanju.Rate this question:
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- 19.
Gravitaciono međudjelovanje je uvijek:
- A.
Privlačno.
- B.
Odbojno
Correct Answer
A. Privlačno.Explanation
Gravitaciono međudjelovanje je uvijek privlačno jer gravitacija je sila koja privlači tijela jedno prema drugome na temelju njihove mase. Prema zakonu gravitacije, veće tijelo će privlačiti manje tijelo s većom silom. Ovo se može primijetiti u svakodnevnim situacijama, poput toga kako Zemlja privlači objekte prema sebi ili kako Mjesec privlači oceane što rezultira plimnim valovima. Odbijanje gravitacijskog međudjelovanja nije moguće prema trenutnom razumijevanju fizike.Rate this question:
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- 20.
Težina tijela na Zemlji iznosi 49,05 N. Njegova masa iznosi:
- A.
49 kg
- B.
5 kg
- C.
4,5 kg
Correct Answer
B. 5 kgExplanation
The weight of an object on Earth is equal to the mass of the object multiplied by the acceleration due to gravity (9.8 m/s^2). In this case, the weight of the body is given as 49.05 N. Since weight = mass x acceleration due to gravity, we can rearrange the formula to find the mass. Dividing the weight by the acceleration due to gravity (49.05 N / 9.8 m/s^2) gives us a mass of approximately 5 kg.Rate this question:
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