Question

State True or False:-

1)Radiation do not require any medium.
2)Litmus is a synthetic dye.
3)Iron and rust are the same substances.
4)Deserts have many large mammals.
5)Climate changes over long time. ​

Answer 1

Answer:

True

True

False

True

True

Answer 2

1) Radiation do not require any medium.

Answer : True

• As, radiation is the mode of heat transfer in which heat is radiated or transmitted from one place to another in the form of rays or waves. It does not require any material medium. It takes place by electromagnetic radiation.

2)Litmus is a synthetic dye.

Answer : False

• Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often adsorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity.

3)Iron and rust are the same substances.

Answer :  False

• Iron and rust are different substances. Rust is iron oxide.

4)Deserts have many large mammals.

Answer : False

• Different species of mammals have evolved to live in nearly all terrestrial and aquatic habitats on Earth. Mammals inhabit every terrestrial biome, from deserts to tropical rainforests to polar icecaps. Many species are arboreal, spending most or all of their time in the forest canopy.

5)Climate changes over long time. ​

Answer : True

• Scientists have predicted that long-term effects of climate change will include a decrease in sea ice and an increase in permafrost thawing, an increase in heat waves and heavy precipitation, and decreased water resources in semi-arid regions.