
Energy and Electric Charge Quiz
Mathematics
3rd Grade
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20 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 4 pts
O que afirma a 1ª lei da termodinâmica sobre a energia?
A energia pode ser criada e destruída.
A energia não pode ser criada ou destruída, apenas transformada.
A energia é sempre perdida em um sistema.
A energia é encontrada apenas em seres vivos.
Answer explanation
The 1st law of thermodynamics states that energy cannot be created or destroyed, only transformed from one form to another. This means energy is conserved in a closed system, making the correct choice the second option.
2.
MULTIPLE CHOICE QUESTION
1 min • 4 pts
Se você tem 5 Joules de energia e usa 2 Joules, quanta energia resta?
3 Joules
7 Joules
2 Joules
5 Joules
Answer explanation
You start with 5 Joules of energy. After using 2 Joules, you subtract 2 from 5, which leaves you with 3 Joules. Therefore, the correct answer is 3 Joules.
3.
MULTIPLE CHOICE QUESTION
1 min • 4 pts
Zoe estava fazendo um experimento de ciências e precisava identificar que tipo de carga tem um elétron. Que tipo de carga ela deve registrar?
Positiva
Negativa
Neutra
Dupla
Answer explanation
An electron carries a negative charge, which is fundamental to its identity. This negative charge is opposite to the positive charge of protons, making it essential for the structure of atoms and the nature of electricity.
4.
MULTIPLE CHOICE QUESTION
1 min • 4 pts
Olivia e Anika estão fazendo um experimento de ciências sobre eletricidade. Qual das seguintes é um tipo de carga elétrica que elas devem considerar?
Magnética
Positiva
Gravitacional
Térmica
Answer explanation
Positive is a type of electric charge, while magnetic, gravitational, and thermal refer to different forces or properties. Electric charges can be positive or negative, making positive the correct choice.
5.
MULTIPLE CHOICE QUESTION
1 min • 4 pts
Qual é a fórmula da Lei de Ohm?
Answer explanation
Ohm's Law states that voltage (V) is equal to the current (I) multiplied by the resistance (R). Therefore, the correct formula is V = IR, which describes the relationship between these three electrical quantities.
6.
MULTIPLE CHOICE QUESTION
1 min • 4 pts
Charlotte está usando um circuito elétrico em seu projeto de ciências. O circuito tem uma tensão de 10V e uma resistência de 2Ω. Qual é a corrente que passa pelo circuito?
5A
20A
2A
10A
Answer explanation
Using Ohm's Law (V = IR), we can find the current (I). Rearranging gives I = V/R. Substituting the values: I = 10V / 2Ω = 5A. Therefore, the correct answer is 5A.
7.
MULTIPLE CHOICE QUESTION
1 min • 4 pts
O que acontece com a energia em uma lâmpada quando ela é ligada?
Ela desaparece.
Ela é transformada em luz e calor.
Ela se torna energia sonora.
Ela permanece a mesma.
Answer explanation
When a light bulb is turned on, electrical energy is transformed into light and heat energy, which is why it emits light and gets warm.
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