Science Class 10 MCQ Part 1

Some crystals of copper sulphate were dissolved in water. The colour of the solutionobtained would be:

a) Green b) Red

c) Brown d) Blue

The correct sequence of anaerobic reactions in yeast is

a) Glucose $\displaystyle \xrightarrow{{Cytoplasm}}$ Pyruvate $\displaystyle \xrightarrow{{Mitochondria}}$ Lactic acid

a) Glucose $\displaystyle \xrightarrow{{Cytoplasm}}$ Pyruvate $\displaystyle \xrightarrow{{Mitochondria}}$ Ethanol

c) Glucose $\displaystyle \xrightarrow{{Cytoplasm}}$ Pyruvate $\displaystyle \xrightarrow{{Cytoplasm}}$ Lactic acid

d) Glucose $\displaystyle \xrightarrow{{Cytoplasm}}$ Pyruvate $\displaystyle \xrightarrow{{Cytoplasm}}$ Ethanol + Carbondioxide

A student added zinc granules to copper sulphate solution taken in a test tube. Out of the following, the correct observations made by the student will be
- Zinc granules have no regular shape.
- Zinc granules have silvery grey colour.
- The colour of zinc granules changed to brownish-black.

a) C only b) B only

c) A only d) All of these

The focal length of the concave mirror in the experimental set up, shown below, equals

10.3 cm b) 11.0 cm

c) 12.2 cm d) 1.7 cm

Name the blood vessel which carries deoxygenated blood from the heart to the lungs.
- Capillaries b) Pulmonary vein

c) Pulmonary artery d) Aorta

A student, while doing the experiment, on tracing the path of a ray of light passing through a rectangular glass slab, measured the three angles marked as θ1, θ2 and θ3 in the figure. His measurements could be correct if he were to find:

a) θ1 > θ2 but θ2 = θ3 b) θ1 > θ2 > θ3

c) θ1< θ2 but θ1 = θ3 d) θ1< θ2 < θ3

Which of the following statements is correct regarding the propagation of light of different colours of white light in air?

a) All the colours of the white light move with the same speed

b) Red light moves fastest

c) Blue light moves faster than green light

d) Yellow light moves with the mean speed as that of the red and the violet light

In order to complete the diagram of stomatal apparatus given below, nuclei should be drawn in the parts marked.

A, B and C b) A and B c) A and C d) B and C
At noon the sun appears white as

a) light is least scattered

b) all the colours of the white light are scattered away

c) red colour is scattered the most

d) blue colour is scattered the most

The chemical formula of baking soda is:

a) MgCO₃ b) Na₂CO₃

c) MgSO₄ d) NaHCO₃

Which liquid did a student use for putting a drop on the slide before placing the coverslip while preparing a temporary mount of leaf epidermal peel?

a) Water b) Iodine

c) Glycerine d) Safranin

Which of the following can undergo a chemical reaction?

a) CuSO₄ + Fe b) ZnSO₄ + Fe

c) MgSO₄ + Fe d) MgSO₄ + Pb

The clear sky appears blue because

a) Violet and blue lights get scattered more than lights of all other colours by the atmosphere.

b) Blue light gets absorbed in the atmosphere.

c) Light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

d) Ultraviolet radiations are absorbed in the atmosphere.

In which of the following group/ groups of animals, the heart does not pump oxygenated blood to different parts of the body?

a) Amphibians only b) Amphibians and reptiles only

c) Pisces only d) Pisces and amphibians

The speed of light, in a given medium, is 2/3rd of its speed in a vacuum. The absolute refractive index of the medium is equal to:

a) b)

c) d)

Decomposition of vegetable matter into compost is an example of:

a) Endothermic reaction b) Combination reaction

c) Redox reaction d) Exothermic reaction

Which of the following pictures depict the correct image formation

a) b)

When a light passes through a prism, it splits into its component colours. This phenomenon is called.

a) Reflection b) Spectrum

c) Dispersion d) Refraction

The deviation in the path of ray of light can be produced

a) By a glass prism but not by rectangular glass slab.

b) By a glass prism as well as a rectangular glass slab.

c) By a rectangular glass slab but not by a glass prism.

d) Neither by a glass prism nor by rectangular glass slab.

To show experimentally that CO₂ is given out during respiration, student must use

a) KOH solution b) C₂H₅OH

c) Ca(OH)₂ solution d) Al(OH)₃ solution

KOH is a strong base since in solution it forms

a) more number of K⁺ ions b) more number of OH^– ions

c) less number of OH^– ions d) less number of K⁺ ions

Choose the forms in which most plants absorb nitrogen

i. Proteins

Nitrates and Nitrites
1. Urea
1. Atmospheric nitrogen

a) (i) and (ii) b) (iii) and (iv)

c) (i) and (iv) d) (ii) and (iii)

An object is kept at a distance more than twice the focal length (F) from a concave mirror. The image will be formed at a distance:

a) Between F and 2F b) Equal to F

c) More than 2F d) Less then F

Twinkling of stars is due to atmospheric

a) dispersion of light by water droplets

b) internal reflection of light by clouds

c) refraction of light by different layers of varying refractive indexes

d) scattering of light by dust particles

25. Given below are certain chemical properties of substances.

It turns blue litmus red.
It turns red litmus blue.
It reacts with zinc and a gas evolves.
It reacts with solid sodium carbonate to give brisk effervescence.

Which out of these properties are shown by dilute hydrochloric acid?

a) A, C and D only b) A and C only

c) B, C and D only d) A and B only

Which of the following salts contains water of crystallization?
- Gypsum
- Washing Soda
- Blue vitriol
- Plaster of Paris

a) C and D b) B and D

c) A and B d) A, B, C and D

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

a) Scattering of light b) Total internal reflection of light

c) Dispersion of light d) Reflection of light from the earth

Which one of the following elements symbolized as A and B is a metal: ²³₁₁A,⁴⁰₂₀B?

a) Neither A nor B is a metal b) Both A and B are metals

c) A is metal d) B is metal

A student took two test tubes containing 2 ml of dilute hydrochloric acid and added zinc granules to test tube (A) and solid sodium carbonate to test tube (B) as shown below:

The correct observation would be

a) Rapid reaction in both the test tubes b) No reaction in any of the test tubes.

c) Slow reaction in (A) and rapid reaction in (B)

d) Rapid reaction in (A) but a slow reaction in (B)

Silver articles on exposure become black. It is an example of

a) Oxidation reaction b) Corrosion

c) Reduction reaction d) Redox reaction

31 Assertion (A): Plaster of Paris is used by doctors by setting fractured bones.

Reason (R): When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass.

a) Both A and R are true and R is the correct explanation of A.

b) Both A and R are true but R is not the correct explanation of A.

c) A is true but R is false.

d) A is false but R is true.

Assertion (A): Magnesium chloride is an ionic compound.

Reason (R): Metals and nonmetals are formed by mutual transfer of electrons.

Both A and R are true and R is the correct explanation of A.
1. b) Both A and R are true but R is not the correct explanation of A.

c) A is true but R is false.

d) A is false but R is true.

Assertion (A): Blood of insects is colourless.

Reason (R): The blood of insect does not play any role in transport of oxygen.

Both A and R are true and R is the correct explanation of A.
1. b) Both A and R are true but R is not the correct explanation of A.

c) A is true but R is false.

d) A is false but R is true.

Assertion (A): Refractive index of glass with respect to air is different for red light andviolet light.

Reason (R): Refractive index of a pair of media depends on the wavelength of light used.

Both A and R are true and R is the correct explanation of A.
1. b) Both A and R are true but R is not the correct explanation of A.

c) A is true but R is false.

d) A is false but R is true.

Assertion (A): The twinkling of stars is due to the fact that the refractive index of the earth’s atmosphere fluctuates.

Reason (R): When light propagates from one medium to another its direction of propagation changes.

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

b) Both A and R are true but R is not the correct explanation of A.

c) A is true but R is false.

d) A is false but R is true.

Which of the following gives the correct increasing order of acidic strength?
- Hydrochloric acid < Water < Acetic acid

b) Water < Acetic acid < Hydrochloric acid

c) Water < Hydrochloric acid < Acetic acid

d) Acetic acid < Water < Hydrochloric acid

Which of the following can be best used to find the focal length of a lens?
- light from window of our lab b) light from a distant tree

c) object at a distance of 10 cm for a focal length of 30 cm

d) light from sun

38 A student performed the starch test on a leaf. Some steps involved are shown below.

The correct sequence of steps should be

a) (i), (iii), (iv), (ii) b) (iv), (iii), (ii), (i)

c) (i), (ii), (iii), (iv) d) (ii), (iii), (iv), (i)

Refraction cannot cause bending as light moves from one surface to another if the incident and refraction angles i and r are related as:

a) i = r = 90^ob) i = 0^o = r = 90^o

c) i ≠ r = 0^od) i = r = 0^o

Which of the following is(are) true when HCl (g) is passed through water?
- It does not ionise in the solution as it is a covalent compound.
- It ionises in the solution
- It gives both hydrogen and hydroxyl ion in the solution
- It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule

a) (iii) and (iv) b) (iii) only

c) (i) only d) (ii) and (iv)

Four students reported the following observation tables for the experiment, to trace the path of a ray of light passing through a glass slag for different angles of incidence. The observations, likely to be correct are those of student.

a) IV b) III

c) I d) II

If two lenses of power P1 and P2 are put in contact, what will be the net power?

a) P1 × P2 b) P1 – P2

c) P1/ P2d) P1 + P2

43. Match the following with correct response

Column A Column B

(i) Insects (a) Gills

(ii) Earthworm (b) Trachea

(iii) Fishes (c) Lungs

(iv) Mammals (d) Skin

c) (i) – (a), (ii) – (c), (iii) – (b), (iv) – (d) b) (i) – (d), (ii) – (a), (iii) – (c), (iv) – (b)

c) (i) – (c), (ii) – (b), (iii) – (d), (iv) – (a) d) (i) – (b), (ii) – (d), (iii) – (a), (iv) – (c)

A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the
- lens and the object b) object and the screen

c) lens and the screen d) None of these

Choose the correct path of urine in our body
- Kidney → Ureter → Urethra → Urinary bladder

b) Urinary bladder → Kidney → Ureter→ Urethra

c) kidney → Urinary bladder → Urethra → Ureter

d) Kidney → Ureters → Urinary bladder → Urethra

With an increase in the thickness glass slab the lateral displacement:
- Remains same b) Increases
- Decrease d) Zero

47. Match the following with correct response.

(a) Atmospheric refraction (i) Twinkling of star

(b) Scattering of light (ii) Rainbow

(d) Tyndall effect (iv) White colour of clouds

c) (a) – (i), (b) – (iii), (c) – (ii), (d) – (iv) d) (a) – (ii), (b) – (iv), (c) – (i), (d) – (iii)

c) (a) – (iii), (b) – (ii), (c) – (iv), (d) – (i) d) (a) – (iv), (b) – (i), (c) – (iii), (d) – (ii)

48. Which of the following metal reacts neither with cold water nor with hot water but reacts with hot steam to produce hydrogen gas?

a) Mg b) Fe

c) Ca d) Na

Question No. 49 to 52 are based on the given text. Read the text carefully and answer the questions:

In electrolysis, the electric current is used to carry out decomposition. Hence it is an electrolytic decomposition. During the electrolysis of water, the reaction involved is:

2H₂O(l) ⟶ 2H₂ (g) + O₂ (g)

During electrolysis, the charges carried by anode and cathode are respectively:
- +ve, -ve

b) -ve, +ve

c) each -ve

d) each +ve

The gases released respectively at anode and cathode during electrolysis of water is:
- H₂, O₂

b) O₂, no gas at the cathode

c) H₂, no gas at the cathode d) O₂, H₂

The volume of gas collected at the cathode during the electrolysis of water is:
- same as the volume of gas collected the anode
- half of the volume of gas collected at at the anode

c) double of the volume of gas collected at the anode

d) one-fourth of volume of gas collected at the anode

Which is the most popular method of hydrogen production according to the pie chart given below?

a) Oil reforming	b) Electrolysis
c) Methane steam reforming	d) Coal gasification

Question No. 53 to 56 are based on the given text. Read the text carefully and answer the questions:

Sanjay studied about blood circulation in humans. He wanted to observe the flow of blood and was about to cut his finger a bit. He suddenly realized that this could be fatal.

What is the correct route for blood flow in a human?

a) left auricle → left ventricle → right ventricle → right auricle → lungs

b) left auricle → left ventricle → lungs → right ventricle → right auricle

c) right auricle → right ventricle → lungs → left auricle → left ventricle

d) right auricle → right ventricle → left ventricle → left auricle → lungs

The diagram shows the vertical section through the heart:

What are the functions of the numbered blood vessels?

carries blood to body-1, carries blood to lungs-2, carries blood from lungs- 3, carries blood from body-4

b) carries blood to body-2, carries blood to lungs-4, carries blood from lungs- 3, carries blood from body-1

c) carries blood to body-3, carries blood to lungs-1, carries blood from lungs-4, carries blood from body-2

d) carries blood to body-1, carries blood to lungs-3, carries blood from lungs-4, carries blood from body-2

The table shows the characteristics of blood in one blood vessel of the body.

oxygen concentration	carbon dioxide concentration	pressure
high	low	high

Which blood vessel contains blood with these characteristics?

Pulmonary vein b) Vena cava

c) Aorta d) Pulmonary artery

The colour of blood is red due to the presence of
- Haemoglobin b) Xanthophyll

c) Hemocyanin d) Chlorophyll

Question No. 57 to 60 are based on the given text. Read the text carefully and answer the questions:

Metal has various physical properties which include metallic lustre that they have shining surfaces in their pure state. Metal can be easily beaten into thin sheets. They are ductile can drown into wire due to which metal can be given different shapes according to their needs. Metal is a good conductor of heats and has high melting and boiling point.

Which of the following is the least reactive metal?
- Lead b) Sodium

c) Copper d) Silver

The metal which is most ductile ________.
- aluminium b) magnesium

c) gold d) copper

Which of the following metal exist in a liquid state?
- Calcium b) Mercury

c) Sodium d) Potassium

Which of the following metal is a poor conductor of heat?
- All of these b) Copper

c) Lead d) Silver

Science Class 10 MCQ Part 1

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