CBSE Class 10 Science Question Paper Solved 2019 Set M

CBSE Class 10 Science Question Paper Solved 2019 Set M. 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. State Ohm’s law.

2. Name any two nutrients that the spent slurry has in the biogas plant.

SECTION B

3. Draw a labelled ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror. Mark the angle of incidence and angle of reflection on it.

4. A compass needle is placed near a current carrying straight conductor. State your observation for the following cases and give reasons for the same in each case :

(a) Magnitude of electric current is increased.

(b) The compass needle is displaced away from the conductor.

5. Out of HCl and CH₃COOH, which one is a weak acid and why ? Explain with the help of an example.

OR

‘‘Sodium hydrogen carbonate is a basic salt.’’ Justify this statement. How is it converted into washing soda ?

SECTION C

6. Define genetics. Why is decrease in the number of surviving tigers a cause of concern from the point of view of genetics ? Explain briefly.

7. A concave mirror has a focal length of 20 cm. At what distance from the mirror should a 4 cm tall object be placed so that it forms an image at a distance of 30 cm from the mirror ? Also calculate the size of the image formed.

OR

A real image 2/3rd of the size of an object is formed by a convex lens when the object is at a distance of 12 cm from it. Find the focal length of the lens. 8.2 g of ferrous sulphate crystals are heated in a dry boiling tube.

(a) List any two observations.

(b) Name the type of chemical reaction taking place.

(c) Write balanced chemical equation for the reaction and name the products formed.

OR

You might have noted that when copper powder is heated in a china dish, the reddish brown surface of copper powder becomes coated with a black substance.

(a) Why has this black substance formed ?

(b) What is this black substance ?

(c) Write the chemical equation of the reaction that takes place.

(d) How can the black coating on the surface be turned reddish brown ?

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