Light: Shadows and Reflections — Science STD 7 — Question

A cold steel spoon is dipped into a cup of hot coffee, it will transfer heat to its other end or not? If yes then by which process?

Banana is a fruit without seeds. Give reason.

If we say that a train is moving at 40 kilometres per hour, what do you mean by this statement?

Deforestation can increase the earth’s temperature. Is it true? Give reason.

Write the colour of copper sulphate solution obtained when Iron nails are dipped in it?

State Four characteristics which are included in the physical properties of matter.

Define peristalsis?

Out of the two given clocks, a pendulum clock or a quartz clock. Mention which of the clock between the given ones requires an electric cell for its working?

It is preferred to use two thin blankets rather than one thick blanket. Explain the reason.

State the consequence when one food chain is disturbed in an ecosystem.