CBSE Class 10 Science Sample Paper 2013 Set 04

Que. 1 Acetic acid was added to four test tubes containing the following chemicals:

        a. Sodium carbonate

        b. Blue litmus solution

        c. Lime water

        d. Distilled water

Que. 2 On adding concentrated NaOH solution to a test tube containing phenolphthalein, the colour change observed by a student would be:

        a. Pink to colourless

        b. Pink to blue

        c. Colourless to pink

        d. Red to blue

Que. 3 A student while observing the properties of acetic acid would report that this acid smells like

        (i) vinegar and turns red litmus blue

        (ii) rotten egg and turns red litmus blue

        (iii) vinegar and turns blue litmus red

        (iv) rotten egg and turns blue litmus red

VSA

Que. 5 Give one example of a unisexual flower.

Que. 6 Draw the electron dot structure of the gas molecule which is liberated when zinc metal is treated with aqueous NaOH solution.

Que. 7 Find the period and group of the element whose atomic number is 12.

Que. 8 Refractive index of two material medium X and Y are 1.3 and 1.5 respectively. In which of the two, the light would travel faster?

Que. 9 Write in one word or at the most in one sentence about the following

         (i) Mirrors used by dentists to examine teeth

         (ii) The smallest distance, at which the eye can see objects clearly without strain.

Que. 10 List two differences between acquired and inherited traits.

Que. 11 State how would you distinguish between Acetic acid and Ethanol in your laboratory. Give chemical equation of the reactions shown by them. Write the chemical equations involved.

Please refer to attached file for CBSE Class 10 Science Sample Paper 2013 Set D