# class 10 science mcq online test term 1

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Q. 1)  When light is incident from air on a
rectangular glass slab and , then the angle
of incidence will be:

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(a) 0°
(b) 45°
(c) 90°
(d) depends on the refractive index of glass

Explanation: When light is incident on a
glass slab and , it means that light is incident
normally on the glass interface. Therefore,
angle of incidence = 00.

Q. 2)  Which of the following statement is incorrect  regarding the significance of the chemical  equations?

(a) A chemical equation provides both
qualitative and quantitative details of a
chemical change.

(b) A chemical equation tells about the
names of various reactants and products.

(c) A chemical equation provides
information regarding the relative
number of molecules (or atoms) of
reactants and products, involved in the
reaction.

(d) A chemical equation provides the
information about the density of product  formed.

Answer: (d) A chemical equation provides the  information about the density of product
formed.

Rise of Nationalism in Europe Class 10 very short one mark Questions and Answers

## class 10 science mcq online test

Q. 3)  Among the following, the correct balanced  equation is

(a) 3Fe + 4H2O → Fe3O4 + 4H2
(b) Zn + HCl → ZnCl2 + H2
(c) N2 + H2 → NH3
(d) C + O2 → CO

Answer:  (a) 3Fe + 4H2O → Fe3O3 + 4H2

Explanation: A balanced chemical equation
occurs when the number of atoms involved
in the reactant side is equal to the number of
atoms in products side.

Q. 4)  In which of the following equation, the mass  is not same on both the sides?

(a) Word equation           (b) Skeletal equation
(c) Balanced equation    (d) Both (a) and (b)

Answer:  (d) Both (a) and (b)

Explanation: In both word and skeletal
equation the mass is not same on both the
sides.

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Q. 5)  How is input of energy represented in
chemical equation?

(a) delta (D)                (b) nu (µ)
(c) hν                            (d) Both (a) and (c)

Answer:  .(d) both (a) and (c)

Explanation: The greek letter delta (D)
represent the input of heat energy while
formula ‘hν’ describe the input of light as
energy source.

Q. 6)  Photosynthesis occurs in

(a) Endoplasmic reticulum
(b) Golgi body
(c) Stomata
(d) Chloroplast

Explanation: Photosynthesis takes place in
the cell organelles found in green plants called
chloroplast which contain chlorophyll

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Q. 7)  The carbohydrates which are not used
immediately by plants is stored in the form
of :

(a) Glycogen                     (b) Starch

Explanation: Starch serves as the internal
energy reserve to be used as and when
required by the plant

Q. 8)  Which of the following are functions of
stamata:

(I) Exchange of gases

(II) Transpiration

(III) Prevents loss of water at night

(IV)Translocation

(a) Both I and II

(b) Both I and III

(c) I, II and III

(d) I, III and IV

Explanation: Stomata allow the exchange of
gases (CO2 and O2) with the atmosphere.
Evaporation of water from the leaf surface
occurs through the stomata. Thus, the stomata help in the process of transpiration. Based on the climatic conditions, it closes or opens its pores to maintain the moisture balance. Stomata remains open during the day and closed at night. This closure at night prevents water from Escaping through open pores.

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Q. 9) Distance of an object from the mirror is:

(a) 20 cm (b) 30 cm
(c) 50 cm (d) 60 cm

Q. 10) Which of the following is not a chemical Change

(a) Getting salt from sea water
(b) Ripening of fruits and vegetables
(c) Formation of curd from milk
(d) Burning of coal

Answer: (a) Getting salt from sea water

Explanation: The changes, which can give back the reactants by reverse process are called physical changes. hence, getting of salt from sea water is a physical change.

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Q. 11) Hydrogen chloride gas is prepared by the reaction between substances labelled A and B in the figure below. On a humid day, the gas is usually passed through a guard tube containing C.

Identify the substances A, B and C and select
the row containing the correct labelling of
the substances A, B and C.

Answer: (a) A = H2SO4, B = NaCl, C = CaCl2

Explanation: Hydrogen chloride gas is prepared by the reaction between sodium chloride (B) and conc sulphuric acid (A).
2NaCl + H2SO4 → Na2SO4 + 2HCl
On a humid day, the gas is passed through a
guard tube containing calcium chloride (C) as
calcium chloride will dry the gas by absorbing
the moisture.

Q. 12) An element X having atomic number 13 forms a compound with element Y having
atomic number 9. The cations and anions
formed will be:

(a) 3[X+] and [Y3-]

(b) [X3+] and 3[Y- ]

(c) 3[X+] and 3[Y- ]

(d) [X3+] and [Y3-]

Answer: (b) [X3+] and 3[Y– ]

Explanation: The electronic configuration of X and Y will be:X: 2, 8, 3
Y: 2, 7 The compound formed between X and Y will be an ionic compound as transfer of electrons will take place from X (being a metal) to Y (being a non-metal).
The formula of compound formed will be XY3. The ions formed will be:
X → X3+ + 3e–
3Y + 3e– → 3[Y– ]
So, the cation formed will be [X3+] and anion
formed will be 3[Y- ]

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Q. 13) Baking soda is:

(a) sodium hydrogen carbonate
(b) sodium hydroxide
(c) sodium carbonate decahydrate
(d) calcium oxychloride

Answer: . (a) sodium hydrogen carbonate

Q. 14) When a few drops of phenolphthalein is added to a solution having pH 10.5, then
the colour:

(a) changes to blue
(b) changes to pink
(c) changes to red
(d) does not change

Explanation: A solution with pH 10.5 is alkaline in nature and therefore when phenolphthalein is added, it changes to pink colour.

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Q. 15) Photosynthesis is considered an:

(a) Endothermic Reaction
(b) Exothermic Reaction
(c) Physical Reaction
(d) Endothermic and Physical Reaction

Explanation: Photosynthesis is an endothermic reaction because energy, in the form of sunlight is absorbed during the process of formation of glucose by green plants

Q. 16) Which part of alimentary canal receives bile from the liver?

(a) Stomach (b) Small intestine
(c) Large intestine (d) Oesophagus

Explanation: Bile is secreted by the liver and is stored in the gall bladder from where it enters the small intestine via a common duct.

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Q. 17) Select the incorrect statements about
lymph:

(I) It is also called tissue fluid

(II) It is similar to RBC of blood

(III) It drains into blood capillaries

(IV)It carries digested and absorbed fat from  intestines

(a) Both (II) and (IV)

(b) Both (I) and (IV)

(c) Both (I) and (III)

(d) Both (II) and (III)

Answer: (d) Both (II) and (III)

Explanation: Lymph is similar to the plasma of blood but colourless and contains less protein. It drains into lymphatic capillaries.

Q. 18) Which of the following are true about breathing?

(I) The diaphragm and muscles attached to  ribs relax during inhalation.

(II) The thorax moves upwards and outwards  during inhalation, thereby decreasing  the volume inside thoracic cavity.

(III) During exhalation, the muscles of
diaphragm and ribs relax.

(IV)The thoracic cavity contracts and comes  back to its original size during exhalation.

(a) Both (I) and (III)

(b) Both (II) and (III)

(c) Both (I) and (IV)

(d) Both (III) and (IV)

Answer: (d) Both (III) and (IV)

Explanation: The diaphragm and muscles
attached to ribs contract during inhalation. The
thorax moves upwards and outwards during
inhalation, thereby increasing the volume
inside thoracic cavity.

### class 10 science mcq chapter 1

Q. 19) The transport of soluble products of
photosynthesis is called:

(a) Transpiration
(b) Exhalation
(c) Translocation
(d) Nutrition

Explanation: The transport of soluble products
of photosynthesis is called translocation and it
occurs in the phloem

Q. 20) Select the correct statements:

(I) The centre of curvature C of a spherical mirror is a part of the mirror.

(II) The centre of curvature of a concave mirror lies in front of it.

(III) The centre of curvature of a concave mirror lies behind the mirror.

(IV)The centre of curvature of a convex
mirror lies behind the mirror.

(a) Both (I) and (II) (b) Both (II) and (III)
(c) Both (I) and (IV) (d) Both (II) and (IV)

Answer: (d) Both (II) and (IV)

Explanation: The centre of curvature of a
spherical miror is not a part of the mirror
as it is the centre of the sphere of which the
reflecting surface is a part.

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Q. 21) A pole of height 1.8 m stands in front of a larger vertical plane mirror. The distance of the image from the pole at a distance of 1.5 m from the mirror is:

(a) 1.8 m (b) 1.5 m
(c) 1.2 m (d) 3.0 m

Explanation: In case of plane mirror, the image is as far behind mirror as the object is in front. Therefore, the distance of the image from the man = 1.5 m + 1.5 m = 3 m

Q. 22) Which of the following metals do not react with oxygen even at high temperature?

(III) Zinc (IV)Gold

(a) Both (I) and (II) (b) Both (II) and (III)
(c) Both (I) and (III) (d) Both (II) and (IV)

Answer: (d) Both (II) and (IV)

Explanation: Metals such as silver and
gold do not react with oxygen even at high
temperatures as they are relatively inert

## class 10 science mcq chapter 3

Q. 23) Select the correct observations when calcium is treated with water:

(I) Ca reacts with cold water

(II) Ca reacts with hot water

(III) Ca does not react either with cold water  or with hot water.

(IV)Ca starts floating as the bubbles of
hydrogen gas stick to its surface.

(a) Both (I) and (II)

(b) Both (I) and (IV)

(c) Both (II) and (IV)

(d) Both (III) and (IV)

Answer: (b) Both (I) and (IV)

Explanation: Ca reacts with cold water and
calcium starts floating because the bubbles
of hydrogen gas formed stick to the surface of
the metal.
Ca + 2H2O → Ca(OH)2 + H2

Q. 24) Select the correct statements regarding metal oxides:

(I) Ca reacts with cold water

(II) Ca reacts with hot water

(III) Ca does not react either with cold water  or with hot water.

(IV)Ca starts floating as the bubbles of
hydrogen gas stick to its surface.

(a) Both (I) and (II)

(b) Both (I) and (IV)

(c) Both (II) and (IV)

(d) Both (III) and (IV)

Answer: (a) Both (I) and (III)

Explanation: Metal oxides are basic in nature
as they react with acids to form salt and water.
For example, CuO + 2HCl → CuCl2 + H2O

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Q. 25) The danger signals are red in colour because it is:

(a) strongly scattered by fog or smoke
(b) least scattered by fog or smoke
(c) least absorbed by fog or smoke
(d) strongly absorbed by fog or smoke

Answer: (b) least scattered by fog or smoke

Explanation: The danger signals are red in
colour because it isleast scattered by fog or
smoke. Therefore, it can be seen in the same
colour even at a distance.

Q. 26) The air layer of atmosphere whose
temperature is less than the hot layer
behave as optically:

(a) denser medium
(b) rarer medium
(c) inactive medium
(d) either denser or rarer medium

Explanation: Colder air have higher refractive
index than hotter air.

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Q. 27) Which of the following statement do not correctly represent the use of sodium
hydroxide?

(a) It is used in paper making

(b) It is used to rayon and acetate fibers

(c) it is used in killing bacteria in drinking wastes and in swimming pool

(d) It is used in detergents and soaps to remove greases.

Answer: (c) it is used in killing bacteria in drinking waster and in swimming pool

Explanation: Chlorine gas is used in killing
bacteria in drinking water and in swimming
pool.

Q. 28) The event that does not occur in
photosynthesis

(a) Absorption of light energy by chlorophyll

(b) Conversion of light energy to chemical  energy

(c) Splitting of water molecules into
hydrogen and oxygen

(d) Oxidation of carbon to carbon dioxide

Answer: (d) Oxidation of carbon to carbon dioxide

Explanation: During photosynthesis, reduction
of carbon dioxide to carbohydrates takes place.

## class 10 science mcq chapter 6

Q. 29) The direction of diffusion of carbon dioxide and oxygen gases in plants depends on:

(I) Environmental conditions

(II) Plant requirements

(III) Rate of transpiration

(IV)Amount of ATP available

(a) Both (I) and (II)

(b) Both (II) and (III)

(c) Both (I) and (IV)

(d) Both (II) and (IV)

Answer: (a) Both (I) and (II)

Explanation: The direction of diffusion of
carbon dioxide and oxygen gases in plants
depends on the environmental conditions and
the requirements of the plant

Q. 30) The blood vessel that collects the blood from different organs and brings it back to the
heart is:

(a) Arteries (b) Veins
(c) Capillaries (d) Lymph