CBSE Class 10 Science Sample Paper 2019 Set B

SECTION - A

Q.1 Predict the maximum number of valence electrons possible for atoms in first period of periodic table. 

Q.2 In a beetle population, the number of green beetles is more than blue and red beetles.

Give a reason behind this situation. 

Q.3 Name the source of energy from which an ecosystem gets energy. 

Q.4 Recycling is considered as a welcome practice to deal with the environmental problems. Justify this statement with two arguments. 

Q.5 What is Chipko Movement ? Why should we conserve forest ? 

Q.6 A converging lens has a focal length of 250 mm. Calculate its power and express it according to sign convention.

Q.7 For plants like banana and oranges that have lost their capacity to produce seeds a different ways are used for increasing their number. Explain the method used for such plants. 

Q.8 Write structure of ethyl alcohol (ethanol) and identify its functional group. Give chemical equation of its reaction with

(i) sodium (ii) excess conc H₂SO₄ at 443 K 

Q.9 The atomic number of Na and Mg is 11 and 12 respectively and they belong to the same period.

(a) Which one would have smaller atomic size ?

(b) Which one would be more electropositive ?

(c) To which group would each one belong ?

Please click the below link to access CBSE Class 10 Science Sample Paper 2019 Set B