P-1 Space Missions — Science STD 10 — Question

Obtain the relation between the refractive index of the second medium with respect to the first medium and the refractive index of the first medium with respect to the second medium.

Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.

Name three products of the chlor-alkali process. State two uses of each of these products.

Take a rectangular cardboard with two holes. Take a coil of large numbers of turns. Insert the coil through the holes such that the turns are normal to the plane of the cardboard. Connect two ends of the coil in series with battery, a key and a rheostat as shown in figure 5.15. Sprinkle iron filings uniformly on the cardboard. Plug the key, tap the cardboard gently. Note your observations.

State the Cartesian sign convention for refraction of light (image formation) by a lens.

What is a spectrum? Why do we get a spectrum of seven colours when while light is dispersed by a prism?
(OR)
Explain how a spectrum is formed.

What substances are contained in gastric juice? What are their functions?

Identify the type of disaster. 
(a) Terrorism (b) Soil erosion (c) Hepatitis (d) Forest fire (e) Famine (f) Theft

With a neat labelled diagram, describe the pattern of magnetic lines of force due to a current through a circular loop. Also explain how the magnetic field depends on the number of turns (n) in the loop.

3, 1, 2 electrons are in valence shells of X, Y, Z elements. From this information, state the group in which they belong and write their valencies.