CBSE Class 10 Science Question Paper Solved 2019 Set O

CBSE Class 10 Science Question Paper Solved 2019 Set O. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. If the potential difference across the two ends of a conductor is 5 V and the current through it is 0·2 A, then what is the resistance of the conductor ?

2. Write the major hazard of nuclear power generation.

SECTION B

3. Draw a labelled ray diagram to show the path of the reflected ray corresponding to the ray which is incident obliquely to the principal axis, towards the pole of a convex mirror. Mark the angle of incidence and angle of reflection on it.

4. What is the principle of an electric motor ? State the rule which is applied to determine the direction of force experienced by a current carrying conductor when kept in a magnetic field.

5. Name the acid present in ant sting and give its chemical formula. Also give the common method to get relief from the discomfort caused by the ant sting.

OR

A student prepared solutions of (i) an acid and (ii) a base in two separate beakers but forgot to label the solutions and litmus paper is not available in the laboratory. Since both the solutions are colourless, how will he distinguish between the two using (a) phenolphthalein and (b) methyl orange ?

SECTION C

6. What is a food chain ? Why is the flow of energy in an ecosystem unidirectional ? Explain briefly.

OR

(a) Why should National Parks be allowed to remain in their pristine form ?

(b) Why is reuse of materials better than recycling ?

7. What is a dam ? List two main advantages and two ill effects of constructing a big dam.

8. (a) Write two water conducting tissues present in plants. How does water enter continuously into the root xylem ?

(b) Explain why plants have low energy needs as compared to animals. 

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper Solved 2019 Set O.