Magnetic Effects of Electric Current — Science STD 10 — Question

What type of current is given by

1. A dry cell.
2. A Power House generator.

How does construction of dams across the river get linked with production of greenhouse gases?

Danger’ signls are red in colour because the red coloured light having longer wavelength is the least scattered by fog or smoke particles. Due to this the red light can be seen in the same colour even from a distance.
 

A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
Construct a food chain for the pond.
How many links are there in this chain?

What is the SI unit of (i) electric energy, and(ii) electric power?

Why is diamond used for making cutting tools (like glass cutters) but graphite is not?

Buckminsterfullerene is a spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.

1. How many hexagons of carbon atoms are present in one molecule of buckminsterfullerene?
2. How many pentagons of carbon atoms are present in one molecule of buckminsterfullerene?

A person wants to see the full length image of tall building in a small mirror. Which type of mirror is used by him?