8. Sınıf İngilizce Science Testleri

Doğru cevap: D

A fair test changes only one variable. Here, the fertilizer is the only thing that should differ. All other conditions must stay the same.

1. Çözüm: A fair test changes only one variable. Here, the fertilizer is the only thing that should differ. All other conditions must stay the same.

Doğru cevap: A

Temperature generally affects reaction rate, but not in a fixed way like “definitely double.” The effect depends on factors such as activation energy and reactants. Therefore, the claim is too certain.

1. Çözüm: Temperature generally affects reaction rate, but not in a fixed way like “definitely double.” The effect depends on factors such as activation energy and reactants. Therefore, the claim is too certain.

Doğru cevap: B

An outlier may be an error or an important finding. The correct approach is to recheck and repeat measurements. Then you decide using evidence.

1. Çözüm: An outlier may be an error or an important finding. The correct approach is to recheck and repeat measurements. Then you decide using evidence.

Doğru cevap: C

Both materials are at room temperature, but metal conducts heat better. It draws heat from your hand faster, so you feel colder. Wood transfers heat more slowly.

1. Çözüm: Both materials are at room temperature, but metal conducts heat better. It draws heat from your hand faster, so you feel colder. Wood transfers heat more slowly.

Doğru cevap: D

A placebo-controlled experiment reduces bias and allows comparison. A large sample size increases reliability. This provides stronger evidence than opinions or single cases.

1. Çözüm: A placebo-controlled experiment reduces bias and allows comparison. A large sample size increases reliability. This provides stronger evidence than opinions or single cases.

Doğru cevap: A

A fair test changes only one variable: the fertilizer. All other conditions must be controlled, and repeating increases reliability. Therefore, B is the best design.

1. Çözüm: A fair test changes only one variable: the fertilizer. All other conditions must be controlled, and repeating increases reliability. Therefore, B is the best design.

Doğru cevap: B

The formation of a solid (precipitate) is a strong sign of a chemical reaction. Cloudiness alone is not enough, but the solid at the bottom supports a reaction. So B is correct.

1. Çözüm: The formation of a solid (precipitate) is a strong sign of a chemical reaction. Cloudiness alone is not enough, but the solid at the bottom supports a reaction. So B is correct.

Doğru cevap: C

Gravity still acts in orbit. Astronauts feel weightless because they are constantly falling toward Earth while moving forward, staying in orbit. They fall together with the spacecraft, so there is no normal force.

1. Çözüm: Gravity still acts in orbit. Astronauts feel weightless because they are constantly falling toward Earth while moving forward, staying in orbit. They fall together with the spacecraft, so there is no normal force.

Doğru cevap: D

During a phase change, temperature can remain constant while energy breaks intermolecular forces. After the change completes, temperature rises again. This matches option C.

1. Çözüm: During a phase change, temperature can remain constant while energy breaks intermolecular forces. After the change completes, temperature rises again. This matches option C.

Doğru cevap: A

A thermometer measures temperature, a balance measures mass, and a measuring cylinder measures volume. The other options mix up the quantities and instruments. Therefore, B is correct.

1. Çözüm: A thermometer measures temperature, a balance measures mass, and a measuring cylinder measures volume. The other options mix up the quantities and instruments. Therefore, B is correct.