## CBSE Class 10 Science MCQs for Term 1

Class 10 Science MCQ: CBSE has begun with the conduction of the Class 10 Term-1 exam and has scheduled the Class 10 Science Exam for 02nd December 2021. With only 2 days left for the exam, the students must practice as much as Class 10 Science MCQs to boost up their preparation and confidence to appear in the real Term-1 Exam. Solving Science MCQ Class 10 for Term-1 will help the students to have an idea of how the questions can be asked and how much time they should give to each question.

## Science MCQs for Class 10 Term-1

In the below article, we have provided you with some important questions as per the new exam pattern Do go through these Class 10 Science MCQs for Term-1 and excel your preparation done so far. Till now, CBSE has conducted one-time descriptive exams and this is the first time CBSE has divided papers into Term-1 & Term-2. There will be Multiple-Choice Questions in Term-1 and helping you to better understand the pattern, practice these Class 10 Science MCQ as per CBSE Term-1 Syllabus.

## CBSE Class 10th Science MCQ Paper

Practice below given Science MCQ Class 10 Questions for Term-1 Exam to be held on 02nd December 2021 and at the end of the article, we have listed the answers to each question. But we advised you to solve these questions first and then reach out to the answer section.

### CBSE Class 10 Science MCQs for Term 1

Q1. Reema took 5ml of Lead Nitrate solution in a beaker and added approximately 4ml of Potassium Iodide solution to it. What would she observe?

Option A The solution turned red.

Option B Yellow precipitate was formed

Option C White precipitate was formed

Option D The reaction mixture became hot

Q2. Which of the following correctly represents a balanced chemical equation?

Option A Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g)

Option B 3Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g)

Option C 3Fe(s) + H2O(g) → Fe3O4 (s) + H2(g)

Option D 3Fe(s) + 4H2O(g) → Fe3O4 (s) + H2(g)

Q3. In the reaction of iron with copper sulphate solution: CuSO4 + Fe ---> Cu + FeSO4

Which option in the given table correctly represents the substance oxidised and the reducing agent?

Q4. The chemical reaction between copper and oxygen can be categorized as:

Option A Displacement reaction

Option B Decomposition reaction

Option C Combination reaction

Option D Double displacement reaction

Q5. Which of the given options correctly represents the Parent acid and base of Calcium Carbonate?

Q6. Before burning in air, the magnesium ribbon is cleaned by rubbing with sandpaper to:

Option A Make the ribbon surface shinier

Option B Remove the layer of magnesium oxide from the ribbon surface

Option C Remove the layer of magnesium carbonate from the ribbon surface

Option D Remove the moisture from the ribbon surface

Q7. A chemical reaction does not involve:

Option A Formation of new substances having entirely different properties than that of the  reactants

Option B Breaking of old chemical bonds and formation of new chemical bonds

Option C Rearrangement of the atoms of reactants to form new products

Option D Changing the atoms of one element into those of another element to form new products.

Q8. How will you protect yourself from the heat generated while diluting a concentrated acid?

Option A By adding acid to water with constant stirring.

Option B By adding water to acid with constant stirring.

Option C By adding water to acid followed by the base.

Option D By adding base to acid with constant stirring.

Q9. Why is it important to balance a skeletal chemical equation?

Option A To verify the law of conservation of energy.

Option B To verify the law of constant proportion.

Option C To verify the law of conservation of mass.

Option D To verify the l0aw of conservation of momentum.

Q10. Carefully study the diagram of the human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and /or characteristic.

Option A (i) Trachea: It is supported by bony rings for conducting inspired air.

Option B (ii) Ribs: When we breathe out, ribs are lifted.

Option C (iii) Alveoli: Thin-walled sac-like structures for exchange of gases.

Option D (iv) Diaphragm: It is pulled up when we breathe in.

Q11. Identify the option that indicates the correct enzyme that is secreted in locations A, B and C.

Option A (i)-lipase, (ii)-trypsin, (iii)-pepsin

Option B (i)-amylase, (ii)-pepsin, (iii)-trypsin

Option C (i)-trypsin, (ii)-amylase, (iii)-carboxylase

Option D (i)-permease, (ii)-carboxylase, (iii)-oxidase

Q12. Opening and closing of stomatal pore depends on:

Option A Atmospheric temperature

Option B Oxygen concentration around stomata

Option C Carbon dioxide concentration around stomata

Option D Water content in the guard cells

Q13. The graph given below depicts a neutralization reaction (acid + alkali → salt + water). The pH of a solution changes as we add excess of acid to an alkali.

Which letter denotes the area of the graph where both acid and salt are present?

Option A A

Option B B

Option C C

Option D D

Q14. Which of the following mirror is used by a dentist to examine a small cavity in a patient’s teeth?

Option A Convex mirror

Option B Plane mirror

Option C Concave mirror

Option D Any spherical mirror

Q15. Which of the following can make a parallel beam of light when light from a point source is incident on it?

Option A Concave mirror as well as a convex lens.

Option B Convex mirror as well as a concave lens.

Option C Two plane mirrors placed at 90° to each other.

Option D Concave mirror as well as a concave lens.

Q16. Consider these indices of refraction: glass: 1.52; air: 1.0003; water: 1.333. Based on the refractive indices of three materials, arrange the speed of light through them in decreasing order.

Option A The speed of light in water >> the speed of light in air >> the speed of light in glass.

Option B The speed of light in glass >> the speed of light in water >> the speed of light in air.

Option C The speed of light in air >> the speed of light in water >> the speed of light in glass.

Option D The speed of light in glass >> the speed of light in air >> the speed of light in water.

Q17. The figure given below shows a schematic plan of blood circulation in humans with labels (i) to (iv). Identify the correct label with its functions?

Option A (i) Pulmonary vein - takes impure blood from the body part.

Option B (ii) Pulmonary artery - takes blood from lung to heart.

Option C (iii) Aorta - takes blood from the heart to body parts.

Option D (iv) Vena cava takes - blood from body parts to the right auricle.

Q18. Identify the phase of circulation which is represented in the diagram of heart given below. Arrows indicate contraction of the chambers shown.

Option A Blood transferred to the right ventricle and left ventricle simultaneously.

Option B Blood is transferred to the lungs for oxygenation and is pumped into various organs simultaneously.

Option C Blood transferred to the right auricle and left auricle simultaneously.

Option D Blood is received from the lungs after oxygenation and is received from various organs of the body.

Q19. Observe the diagram of the human digestive system.

Match the labelling referred to in column I and correlate with the function in column II.

Option A i.- a) ; ii – b) ; iii – c) ; iv- d)

Option B i.- b) ; ii – c) ; iii – d) ; iv- a)

Option C i.- b) ; ii – d) ; iii – c) ; iv- a)

Option D i.- d) ; ii – a) ; iii – b) ; iv- c)

Q20. If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?

Option A r = v

Option B r > v

Option C r = 1/v

Option D r < v

Q21. Identify Gas A in the following experiment.

Option A Nitrogen

Option B Hydrogen

Option C Oxygen

Option D Carbon dioxide

Q22. Which diagram shows the image formation of an object on a screen by a converging lens?

Option A a

Option B b

Option C c

Option D d

Q23. Vinay observed that the stain of curry on a white shirt becomes reddish-brown when soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What might be the reason for his observation?

i. Soap is acidic in nature

ii. Soap is basic in nature

iii. Turmeric is a natural indicator that gives a reddish tinge in bases

iv. Turmeric is a natural indicator that gives a reddish tinge in acids

Option A i and ii

Option B ii and iii

Option C i and iv

Option D ii and iv

Q24. In which of the following setups would the bulb glow?

Option A i and ii

Option B i and iv

Option C ii, iii and iv

Option D i, ii and iv

Q25. The table shown below gives information about four substances: A, B, C and D.

Identify Ionic compounds from the above-given substances.

Option A A, B

Option B B, C

Option C A, B, D

Option D A, C, D

Question No. 26 to 29 consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

Option A Both A and R are true and R is the correct explanation of A

Optio B Both A and R are true and R is not the correct explanation of A

Option C A is true but R is false

Option D A is False but R is true

Q26. Assertion: Fresh milk in which baking soda is added, takes a longer time to set as curd.

Reason: Baking soda decreases the pH value of fresh milk to below 6.

Q27. Assertion: Decomposition of vegetable matter into compost is an endothermic reaction.

Reason: Decomposition reaction involves the breakdown of a single reactant into simpler products.

Q28. Assertion: Resins and gums are stored in old xylem tissue in plants.

Reason: Resins and gums facilitate the transport of water molecules.

Q29. Assertion: Sky appears blue in the day time.

Reason: White light is composed of seven colours.

Q30. The table given below shows the reaction of a few elements with acids and bases to evolve Hydrogen gas

Which of these elements form amphoteric oxides?

Option A A and D

Option B B and D

Option C A and C

Option D B and D

Q31. 5. One of the following processes does not involve a chemical reaction. That is:

Option A Melting of candle wax when heated

Option B Burning of candle wax when heated

Option C Digestion of food in our stomach

Option D Ripening of banana

Q32. It is necessary to balance a chemical equation in order to satisfy the law of:

Option A Conservation of motion

Option B Conservation of momentum

Option C Conservation of energy

Option D Conservation of mass

Q33. Rusting of iron involves a chemical reaction which is a combination of:

Option A Reduction as well as combination reactions

Option B Oxidation as well as combination reactions

Option C Reduction as well as displacement reactions

Option D Oxidation as well as displacement reactions

Q34. When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

Option A Blue to green.

Option B Green to blue.

Option C Green to brown.

Option D Green to yellow.

Q35. Which of the following gases is used in the storage of fat and oil containing foods for a long time?

Option A Carbon dioxide gas

Option B Nitrogen gas

Option C Oxygen gas

Option D Neon gas

Q36. In which of the following groups of organisms, blood flows through the heart only once during one cycle of passage through the body?

Option A Rabbit, Parrot, Turtle

Option B Frog, crocodile, Pigeon

Option C Whale, Labeo, Penguin

Option D Shark, dogfish, stingray

Q37. What is common between an extensive network of blood vessels around walls of alveoli and in the glomerulus of the nephron?

Option A Thick-walled arteries richly supplied with blood

Option B Thin-walled veins poorly supplied with blood

Option C Thick-walled capillaries poorly supplied with blood.

Option D Thin-walled capillaries richly supplied with blood

Q38. Plants use completely different process for excretion as compared to animals. Which one of the following processes is NOT followed by plants for excretion?

Option A They can get rid of excess water by transpiration.

Option B They selectively filter toxic substances through their leaves.

Option C Waste products are stored as resins and gums in old xylem.

Option D They excrete waste substances into the soil around them.

Q39. If the power of a lens is - 4.0 D, then it means that the lens is a

Option A concave lens of focal length -50 m

Option B convex lens of focal length +50 cm

Option C concave lens of focal length -25 cm

Option D convex lens of focal length -25 m

Q40. Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

Option A 30 cm in front of the mirror

Option B 15 cm in front of the mirror

Option C Between 15 cm and 30 cm in front of the mirror

Option D More than 30 cm in front of the mirror

Q41. In which of the following groups of organisms, food material is broken down outside the body and then absorbed in?

Option A mushroom, green plants, amoeba

Option B yeast, mushroom, bread mould

Option C paramecium, amoeba, cuscuta

Option D cuscuta, lice, tapeworm

Q42. In a person the tubule part of the nephron is not functioning at all. What will its effect be on urine formation?

Option A The urine will not be formed.

Option B Quality and quantity of urine is unaffected.

Option C Urine is more concentrated.

Option D Urine is more diluted.

Q43. If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle 14 be placed from the lens?

Option A -80cm

Option B -40 cm

Option C -40/3 cm

Option D -80/3 cm

Q44. While looking at the above diagram, Nalini concluded the following

i. the image of the object will be a virtual one.

ii. the reflected ray will travel along the same path as the incident ray but in opposite direction.

iii. the image of the object will be inverted.

iv. this is a concave mirror and hence the focal length will be negative.

Which one of the above statements are correct?

Option A i and ii

Option B i and iii

Option C ii, iii and iv

Option D i, ii, iii and iv

Q45. In the below diagram light is travelling through different media. It is noted by a scientist that ∠1= ∠3= ∠4 but ∠2 <∠1. Which of the following statement would be correct?

Option A Medium 1 is denser than medium 3 but it’s density is equal to medium 2.

Option B Medium 2 is the rarest medium.

Option C Medium 3 is denser than medium 1.

Option D Medium 1 and 3 are essentially the same medium, but medium 2 is denser than 1

and 3.

Q46. The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

Option A Copper granules

Option B Magnesium ribbon

Option C Sodium pellets

Option D Aluminium dust

Q47. The neutralization reaction between an acid and a base is a type of:

Option A  Double displacement reaction

Option B  Displacement reaction

Option D  Decomposition reaction

Q48. The chemical reaction between Hydrogen sulphide and iodine to give Hydrogen iodide and sulphur is given below:

The reducing and oxidizing agents involved in this redox reaction are:

Option A Iodine and sulphur respectively

Option B Iodine and hydrogen sulphide respectively

Option C Sulphur and iodine respectively

Option D Hydrogen sulphide and sulphur

Q49. An ant’s sting can be treated with …………which will neutralise the effect of the chemical injected by the ant’s sting into our skin. Choose the correct option from the following to be filled in the blank space:

Option A Methanoic acid

Option B Formic acid

Option C Baking Soda

Option D Caustic Soda

Q50. In the reaction, identify the salt formed NH4OH (aq) + H2SO4 (aq) →  _____  +   2H2O (l)

Option A NH4NO3

Option B (NH4)2SO4

Option C (NH4)3PO4

Option D (NH4)2S