P-1 Space Missions — Science STD 10 — Question

A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker? Is it a strong or a weak acid?

What is total internal reflection?

Keeping the resistance constant, the potential difference applied across the ends of a component is halved. By how much does the current change?

The period with electrons in the shells, K, L and M.

What is the chemical name of bleaching powder?

Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.

Write chemical equation for the following events: Electrolysis of alumina is done.

State any one characteristic of gravitational force

Name the five things which contain carbon essentially?

State one use of concave mirror based on the formation of image as in case (z) above.