[ Question Bank ] - 2022 — Science STD 10 — Question

Moving from left to right, the size of the atom decreases.

Isotopes have similar chemical properties.

Appendix is useless to humans.

While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.

Ore contains some impurities, these are called gangue.

Bauxite reacts with sodium hydroxide in the Bayer’s process.

• Right

• Wrong

State whether the following statement is true or false:
The magnetic field inside a long circular coil carrying current will be parallel straight lines.

The electricity meter in the domestic electric circuit measures electrical energy consumption in kilowatt·hours.

Animals belonging to phylum Annelida perform locomotion with the help of tube-feet.

State whether the following statement is true or false:
The planets twinkle at night due to atmospheric refraction of light.