CBSE CLASS-10 SCIENCE 2025 QUIZ NO 5 TOTAL QUESTIONS = 20 Mock Test Quiz Free MCQ pyqonline.com

1. The main observations while performing the experiment of burning magnesium ribbon in air are:'

(i) Magnesium ribbon burns with a dazzling white flame.

(ii) A white powder is formed.

(iii) Magnesium ribbon vapourises.

(iv) Aqueous solution of the white powder turns blue litmus to red.

A. (i) and (iv) B. (ii) and (iii) C. (i) and (ii) D. (iii) and (iv)

2. A metal, M, displaces iron from aqueous solution of ferrous sulphate but fails to do so in case of aqueous solution of aluminium sulphate. The metal M is

A. Magnesium B. Copper C. Lead D. Zinc

3. A common feature observed in the crystals of washing soda, copper sulphate, gypsum and ferrous sulphate is that all

A. exhibit basic nature B. exhibit acidic nature C. have fixed number of molecules of water of crystallisation in one formula unit of these salts. D. are coloured

4. A metal, 'X', on treatment with sodium hydroxide liberates a gas 'G'. It also liberates the same gas, 'G' on treatment with dilute sulphuric acid.
Based on above information, 'X' and 'G' respectively are

A. Copper and Sulphur dioxide B. Zinc and Sulphur dioxide C. Zinc and Hydrogen D. Copper and Hydrogen

5. The values of a, b, c and d in the following balanced chemical equation are respectively:

A. 1, 1, 2, 1 B. 1, 1, 1, 2 C. 2, 2, 1, 4 D. 2, 2, 4, 1

6. During electrolytic refining of copper, the anode, the cathode and the electrolyte used respectively are

A. Impure copper, pure copper, acidified copper sulphate solution B. Pure copper, impure copper, sulphuric acid C. Pure copper, impure copper, acidified copper sulphate solution D. Impure copper, pure copper, distilled water

7. If we make carbon skeleton with four carbon atoms, the two different possible skeletons will be

A. B. C. D.

8. Listed below are the steps of nutrition in Amoeba. Select the correct sequence of these steps:

(i) Diffusion of simple nutrients into cytoplasm

(ii) Food vacuole formation

(iii) Formation of finger like temporary extensions of cell surface

(iv) Complex substances broken to simpler ones

(v) Undigested material thrown out of the cell surface

A. (iv), (i), (ii), (iii), (v) B. (iii), (ii), (iv). (i), (v) C. (ii), (i), (iv), (v), (iii) D. (iii), (iv). (i), (ii), (v)

9. Which among the following is not a neural action controlled by the part of human brain labelled 'X' in the figure above?

A. Salivation B. Hunger C. Vomiting D. Blood Pressure

10. The modes of reproduction in Spirogyra and Planaria respectively are

A. Regeneration and budding B. Regeneration and fragmentation C. Fragmentation and regeneration D. Budding and regeneration

11. The plant hormones promoting rapid cell division in seeds and wilting of leaves respectively are

A. Auxins and Abscisic acid B. Cytokinins and Abscisic acid C. Gibberellins and Auxins D. Abscisic acid and Gibberellins

12. In aerobic respiration, the steps are: breakdown of glucose to pyruvate and its further conversion to carbon dioxide. Both processes respectively occur in-

A. Vacuole and Cytoplasm B. Chloroplast and Mitochondria C. Mitochondria and Cytoplasm D. Cytoplasm and Mitochondria

13. In order to obtain large images of the teeth of patients, the dentist holds the concave mirror in such a manner that the teeth are positioned

A. at the focus of mirror. B. between pole and focus of the mirror. C. between focus and centre of curvature of the mirror. D. at the centre of curvature of the mirror.

14. The possible way to restore clear vision of those people whose eyeball has elongated is the use of suitable

A. bifocal lens B. concave lens C. converging lens D. convex lens

15. The examples of natural and manmade (artificial) ecosystems are respectively

A. Forests and ponds B. Crop fields and lakes C. Lakes and gardens D. Crop fields and forests

16. Human activities that are affecting the environment are

A. minimising the use of chloroflurocarbons. B. excessive use of disposable cups and plates. C. maximising the use of reusable utensils for eating food and drinking fluids. D. segregating the wastes into biodegradable and non-biodegradable before disposal.

17. Assertion (A): Silver chloride turns grey in sunlight.
Reason (R) : Decomposition of silver chloride into silver and chlorine takes place by sunlight.

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C. Assertion (A) is true, but Reason (R) is false. D. Assertion (A) is false, but Reason (R) is true.

18. Assertion (A): The embryo gets nutrition from the mother's blood with the help of a special tissue called placenta.
Reason (R): Placenta is a disc which is embedded in the uterine wall.

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C. Assertion (A) is true, but Reason (R) is false. D. Assertion (A) is false, but Reason (R) is true.

19. Assertion (A): The pattern of the magnetic field of a solenoid carrying a current is similar to that of a bar magnet.
Reason (R): The pattern of the magnetic field around a current carrying conductor is independent of the shape of the conductor.

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C. Assertion (A) is true, but Reason (R) is false. D. Assertion (A) is false, but Reason (R) is true.

20. Assertion (A): All organisms can make organic compounds like sugar and starch from inorganic substances using radiant energy of the sun.
Reason (R): The organisms which can produce food by photosynthesis are called producers.

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C. Assertion (A) is true, but Reason (R) is false. D. Assertion (A) is false, but Reason (R) is true.