CBSE Class 7 Science The Ever-Evolving World of Science (Class 7 NCERT New) Quiz 4

1. A student divides minerals into metallic and nonmetallic luster after looking closely. What supported this classification?

A Random guesses without notes B Listening to tapping sounds C Detailed visual observations D Mass measurements of samples

2. Which experiment would most directly test rain formation?

A Grow beans in a dark cupboard B Measure mass of dry soil samples C Shine light through glass prism in class D Heat air plus water in bottle to condense

3. Which record shows accurate measurement practice?

A Volume: about one cup B Length: 12.00 cm with ruler C Time: later in the day D Mass: heavy by feeling

4. In the landscape scene with sun, clouds, rain, mountains, and a lake, which change is MOST likely occurring between the lake and the clouds?

A Wind turns clouds into soil B Rocks dissolve into clouds C Sunlight condenses into lakes D Water evaporates and forms clouds

5. A chocolate bar is warmed and becomes liquid. Which statement explains this change?

A Heating creates new chocolate molecules forever B Pressure removes energy causing solidification C Heating increases particle motion causing melting D Cooling increases heat energy forming liquid

6. Which pair shows a chemical change that cannot easily be reversed by simple cooling or freezing?

A Wax to liquid wax by heat B Chocolate to liquid by warming C Water to ice in a freezer D Raw egg to fried egg in a pan

7. You observe rain falling while the sun shines on a warm day near a lake. Which plan would best collect evidence to explain the water cycle at this place?

A Ask friends which days felt wetter overall B Measure only wind speed once per week C Record temperatures, humidity, and rainfall daily D Guess the weather using a single photo

8. Which example shows an irreversible change?

A Ice melting into liquid water B Wax solidifying after cooling C Chocolate melting into a liquid D An egg cooking into a solid

9. Why is burning wood considered irreversible?

A It produces new substances like ash and gases B The process uses no energy input at all C The wood can be cooled back into logs D Only the shape of the wood changes

10. A candle is melted into liquid wax and then cooled back into a solid. What is the best conclusion?

A It is irreversible because wax was heated B It is reversible because wax changed color C It is reversible because state change is undone D It is irreversible because light was produced