8. Sınıf İngilizce Science Testleri

Doğru cevap: C

A fair test changes only one variable: the fertilizer. Both groups must be similar and kept under the same conditions. Then any difference in growth can be linked to the fertilizer.

1. Çözüm: A fair test changes only one variable: the fertilizer. Both groups must be similar and kept under the same conditions. Then any difference in growth can be linked to the fertilizer.

Doğru cevap: D

A pH of 2 shows the liquid is strongly acidic. Acids commonly react with some metals and release a gas (often hydrogen). Colourless does not mean neutral.

1. Çözüm: A pH of 2 shows the liquid is strongly acidic. Acids commonly react with some metals and release a gas (often hydrogen). Colourless does not mean neutral.

Doğru cevap: A

An increase in temperature means the water gains (absorbs) thermal energy. Heating transfers energy from the heat source to the water. The starting temperature does not need to be 0°C.

1. Çözüm: An increase in temperature means the water gains (absorbs) thermal energy. Heating transfers energy from the heat source to the water. The starting temperature does not need to be 0°C.

Doğru cevap: B

Without air resistance (in a vacuum), all objects fall with the same acceleration. In air, factors like shape and surface area affect air resistance. So heavier does not always mean faster.

1. Çözüm: Without air resistance (in a vacuum), all objects fall with the same acceleration. In air, factors like shape and surface area affect air resistance. So heavier does not always mean faster.

Doğru cevap: C

Higher temperature increases particle speed. This leads to more frequent and more energetic collisions. Therefore, the reaction rate generally increases.

1. Çözüm: Higher temperature increases particle speed. This leads to more frequent and more energetic collisions. Therefore, the reaction rate generally increases.

Doğru cevap: D

A controlled experiment changes only one variable. Here, only the fertilizer differs between the two identical groups. This makes the results reliable.

1. Çözüm: A controlled experiment changes only one variable. Here, only the fertilizer differs between the two identical groups. This makes the results reliable.

Doğru cevap: A

A single percentage is not enough for a definite claim. Scientists need a control group, sample size, and repeatable results. So the cautious conclusion is best.

1. Çözüm: A single percentage is not enough for a definite claim. Scientists need a control group, sample size, and repeatable results. So the cautious conclusion is best.

Doğru cevap: B

Observations are what you directly measure or sense. Saying a reaction occurred is a conclusion based on evidence. That makes it an inference.

1. Çözüm: Observations are what you directly measure or sense. Saying a reaction occurred is a conclusion based on evidence. That makes it an inference.

Doğru cevap: C

Reliability improves when results are consistent across repeated trials. Multiple trials reduce the effect of random errors. Averaging supports a more accurate conclusion.

1. Çözüm: Reliability improves when results are consistent across repeated trials. Multiple trials reduce the effect of random errors. Averaging supports a more accurate conclusion.

Doğru cevap: D

Bubbles can indicate gas formation. Gas production is a common sign of a chemical change. The other options make unsupported generalizations.

1. Çözüm: Bubbles can indicate gas formation. Gas production is a common sign of a chemical change. The other options make unsupported generalizations.