P-1 Metallurgy — Science STD 10 — Question

If 90 W bulb is connected to a circuit with potential difference of 360 V, find the current flowing through the bulb.

Why is LPG considered a better fuel than coal?

Write notes : Displacement Reaction

To obtain a magnified real image of a small film strip, which type of lens is used? Where is the film strip placed to obtain the image on the screen?

What is a salt? Give the names and formulae of any two salts. Also name the acids and bases from which these salts may be obtained.

What is done with the segregated waste?

Explain the formation of scum when hard water is treated with soap.

Identify from the following reactions the reactants that undergo oxidation and reduction.

Find the heat produced in calorie when a current of 0.2 A is passed through a wire of resistance 20.9 Ω for 10 minutes.

What is biogas? Name the major component of biogas.