CBSE Class 10 Science Sample Paper 2018 Set J

SECTION – A

1. Write one equation for a decomposition reaction where energy is supplied as heat.

2. What is represented by JC^-1?

3. Tooth enamel is one of the hardest substances in our body.How does it undergo damage due to eating chocolates and sweets?

4. Define refractive index in terms of speed of light?

5. Identify the substance oxidized and reduced in 4Na + O₂ → Na₂O.

6. Draw a diagram to show the dispersion of white light by a glass prism?

7. How is bleaching powder prepared? Why does bleaching powder

1) smell strongly of chlorine?

2) not dissolve completely in water?

8. Describe an activity with a neat diagram to show that a magnetic field is generated around a straight current carrying wire.

9. Draw ray – diagrams to describe the nature, position and relative size of the image formed?

1) By a convex lens for the object when it is placed at 2F₁.

2) By a concave mirror for the object when it is placed between pole P and focus F.

10. Draw the structural formula of a compound with two carbon atoms in following cases.

a) An alkane

b) An alcohol

c) An unsaturated hydro carbons.

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