CBSE Class 10 Science Last minute quiz

Quiz

1. Pb + CuCl₂ → PbCl₂ + Cu. The above reaction is an example of:

(a) Combination (b) Decomposition (c) Double displacement (d) Displacement

2. Identify the non-metal which is lustrous.

(a) Sulphur (b) Oxygen (c) Nitrogen (d) Iodine

3. The complete oxidation of ethanol gives:

(a) Acetic acid/ethanoic acid (b) CO₂ and water (c) Ethanal (d) Acetone/Ethanone

4. Which of the following is not a chemical reaction?

(a) Souring of milk (b) Dissolution of sugar in water (c) Rusting of iron (d) Digestion of food

5. Identify the totally impossible outcome of Mendel’s Experiment (cross-breeding purebred tall and short pea plants):

(a) 3 tall 1 short plant (b) 24 tall and 8 short plants (c) 8 tall and 0 short plants (d) 4 tall plants and 1 medium-height plant

6. Who have a perfect pair of sex chromosomes?

(a) Girls only (b) Boys only (c) Both girls and boys (d) It depends on many other factors

7. Every food chain in the ecosystem begins with.......... which is the original source of food.

(a) Saprophytes (b) Parasites (c) Producers (d) Herbivores

8. Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?

(a) Sonorousness (b) Malleability (c) Ductility (d) Conductivity

9. The number of isomers of pentane is:

(a) 2 (b) 3 (c) 4 (d) 5

10. Name the substances that build up in the muscles during vigorous physical exercise and may cause cramps.

(a) Ethanol + Carbon dioxide + Energy (b) Lactic acid + Energy (c) Carbon dioxide + Water + Energy (d) Pyruvate

11. The longest fiber on the cell body of a neuron is called:

(a) Sheath (b) Cytoplasm (c) Axon (d) Dendrites

12. Vegetative propagation refers to the formation of new plants from:

(a) Stem, flowers and fruits (b) Stem, leaves and flowers (c) Stem, roots and flowers (d) Stem, roots and leaves

13. A section of DNA providing information for one protein is called:

(a) Nucleus (b) Chromosomes (c) Trait (d) Gene

14. What is the order of the waste management hierarchy, from most to least favoured?

(a) Prevention-Recycle-Reuse-Disposal (b) Prevention-Reuse-Disposal-Recycle (c) Prevention-Disposal-Reuse-Recycle (d) Prevention-Reuse-Recycle-Disposal

15. Two heater wires of equal length are first connected in series and then in parallel with a battery. The ratio of heat produced in the two cases is:

(a) 2:1 (b) 1:2 (c) 4:1 (d) 1:4

16. What amount of energy will be received by omnivorous if herbivorous is receiving 200KJ from the producer?

(a) 2KJ (b) 20KJ (c) 50KJ (d) 100KJ

17. Assertion (A): Zinc carbonate is heated strongly in the presence of air to form zinc oxide and carbon dioxide.
Reason (R): Calcination is the process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide.

(a) Both A and R are true, and R is the correct explanation of A. (b) Both A and R are true, and R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true.

18. Assertion (A): Pyruvate is a six-carbon molecule.
Reason (R): It is prepared in the cytoplasm as the first step to cellular respiration.

(a) Both A and R are true, and R is the correct explanation of A. (b) Both A and R are true, and R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true.

19. Assertion: Accumulation of variation in a species increases the chances of its survival in a changing environment.
Reason: Accumulation of heat resistance in some bacteria ensures their survival even when the temperature in the environment rises too much.

(a) Both A and R are true, and R is the correct explanation of A. (b) Both A and R are true, and R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true.

20. Assertion: The crown fires are most destructive as they burn the tree top.
Reason: Due to crown fire the temperature of that area may rise up to 700 degrees Celsius.

(a) Both A and R are true, and R is the correct explanation of A. (b) Both A and R are true, and R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true.

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