# Important MCQ question of science class 10

In this post “Important MCQ question of science class 10” we will share with you most important class 10 mcq of science for class 10 term 1 board exam. In this post “Important MCQ question of science class 10” we will share with you most important class 10 mcq of science for class 10 term 1 board exam.

## mcq questions for class 10 science

Q. 1) The ray which is least deviated by a prism is:.

(a) Violet ray (b) Green ray
(c) Red ray (d) Yellow ray

Explanation: Red colour is least deviated by a
prism as the refractive index of glass is least
for red.

Q. 2) The colour of light which has the minimum velocity in the glass prism is:

(a) Red (b) Green
(c) Blue (d) Violet

Explanation: Violet has the least wavelength
among the colours of the visible spectrum. It
has the minimum velocity.

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

## mcq questions for class 10 science biology

Q. 3) The angle of deviation (D) of a prism is :

(a) The angle between incident and refracted ray

(b) The angle between the emergent and refracted ray

(c) The angle between the incident and
emergent ray

(d) The angle between emergent ray and prism surface

Answer: (c) The angle between the incident and emergent ray.

Explanation: The angle between the emergent
ray and the incident ray is known as the
angle of deviation of a prism as shown in the
following figure:

Q. 4) Zinc and silver nitrate reacts to form:

(a) Ag + Zn(NO3)3
(b) ZnNO3 + Ag
(c) AgNO3 + Zn(NO3)2
(d) Zn(NO3)2 + Ag

Explanation: Zn is more reactive than Ag.

## mcq questions for class 10 science chemistry

Q. 5) The table below gives the pH values of some substances in two columns.

The correct matching of substances and their pH value is:

(a) I – (c); II – (b); III – (a); IV – (d)

(b) I – (b); II – (a); III – (c); IV – (d)

(c) I – (d); II – (b); III – (a); IV – (c)

(d) I – (b); II – (d); III – (a); IV – (c)

Answer: (d) I – (b); II – (d); III – (a); IV – (c)

Q. 6) Arrange the following metals in the
decreasing order to reactivity Na, K, Cu and
Ag.

(a) Na > K > Cu > Ag
(b) K > Cu > Na > Ag
(c) Ag > Cu > Na > K
(d) K > Na > Cu > Ag

Answer: (d) K > Na > Cu > Ag

Explanation: The decreasing order of reactivity of the given metals in K > Na > Cu > Ag

## mcq questions for class 10 science physics

Q. 7) Which of the following is decomposed by sunlight?

(a) CuCl2 (b) AgBr
(c) ZnSO4 (d) AlCl3

Explanation: 2AgBr sunlight  →  2Ag + Br2

Q. 8) . The strength of a basic solution can be
increased by:

(b) by decreasing OH–  ions

(d) by reducing H+ ions

Explanation: The strength of base depends on
number of OH– ion produced on adding water.
So by adding OH– ions, the strength of basic
solution can be increased.

## Important MCQ question of science class 10

6. A small amount of sodium hydroxide
solution is added to a small piece of
granulated zinc metal in a test tube. Which
of the following represent correct equation?

(a) Zn(s) + NaOH → Na2ZnO2 + H2
(b) Zn(s) + NaOH → Zn(OH)2 + NaOH
(c) ZnO + NaOH → Na2ZnO2 + H2
(d) Zn + NaOH → No reaction

Answer: (a) Zn(s) + NaOH → Na2 ZnO2 + H2

Explanation: Sodium hydroxide solution is
added to a few pieces of granulated zinc metal
taken in a test tube.
Zn(s) + 2NaOH(aq) → Na2ZnO2(aq) + H2(g)
Zinc sodium sodium zincate Hydrogen
hydroxide

Q. 7) Which of the following is represent in a chemical change?

(a) Remain constant in temperature
(b) Change in colour
(c) Evolution of a gas
(d) Both (b) and (c)

Answer: (d) both (b) and (c)

Explanation: Change in temperature, change
in colour and evolution of gas are the examples
of chemical changes as they cause the change
the chemical structure of the reactants.

Q. 8. ) What is aqua-regia?

(a) It is mixture of conc. HNO3 and H2SO4 (1 : 3)

(b) It is a mixture of HCl and HNO3
(3 :1)

(c) It is a mixture of HCl and H2SO4
(3 : 1)

(d) It is a mixture of HNO3 and H2SO4 (1 : 3)

Answer: (b) It is a mixture of HCl and HNO3 (3 : 1)

Explanation: It is mixture of conc. HCl and
conc. HNO3 in the ratio of 3 : 1

Q. 9. )Acid rain water flowing into a river affects aquatic life by:

(a) contaminating the water
(b) lowering the pH of water
(c) increase the pH of water
(d) deposit harmful metals into water bodies

Answer: (b) lowers the pH of water

Explanation: Acid rain water, if mixed with
river water, will lowers its pH below 5.6, i.e.,
makes river water acidic. While the living body
works normally within a pH range of 7-7.8.
That’s why. flow of acid rain water into a river
makes the survival of aquatic life in the river
difficult.

Q. 10.) What type of a chemical reaction is represented by the following equation:
3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4

(a) Displacement Reaction
(b) Decomposition Reaction
(c) Precipitation Reaction
(d) Combustion Reaction

Explanation: The given reaction represent both Precipitation reaction or double displacement reaction.

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Q. 11) Select the correct match below:

Answer: (d) Internal energy reserve in plants : Starch; Internal energy reserve in human :
Glycogen

Explanation: Internal energy reserve in plants is starch and its glycogen in case of human beings.

Q. 12) Tracheal rings present in throat ensure that:

(a) the air-passage must collapse
(b) the air-passage does not collapse
(c) the air-passazge does not expand
(d) the food-passage does not collapse

Answer: (b) the air-passage does not collapse

Explanation: The given structure are rings
of cartilage, which are present in the throat.
These ensure that the air-passage does not
collapse.

Q. 13) Roots of the plants absorb water from the soil through the process of:

(a) Diffusion (b) Transpiration
(c) Osmosis (d) Both (a) and (b)

Explanation: Plants absorb water from the soil
by osmosis. They absorb mineral ions by active
Root hair cells are adapted for taking up water
and mineral ions by having a large surface
area to increase the rate of absorption.

Q. 14) Study the diagram of the human alimentary canal given below in which four parts have been labelled as A, B, C and D.

Select the options that correctly identify the
parts and their functions or structure.

(I) A: Gall Bladder: stores pancreatic juice

(II) B: Liver: Secretes bile juice

(III) C: Pancreas: Secretes pancreatic juice

(IV): D: Large intestines: Site for complete

digestion of carbohydrates, proteins and fats

(a) Both (I) and (II)

(b) Both (II) and (III)

(c) Both (I) and (IV)

(d) Both (II) and (IV

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

Explanation: Part labelled A is gall bladder
and it stores bile. Part D is large intestine and
it absorbs water from the digested food. Small
intestine is the site of complete digestion of
carbohydrates, proteins and fats.

## mcq questions for class 10 science cbse

Q. 15) Which blood vessels have thick and elastic walls?

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

Explanation: Arteries have thick elastic walls
as they carry blood away from the heart to
various parts of the body and blood comes out
of the heart with very high pressure.

Q 16 ) When the magnification of converging lens is +1, then the image formed is:

(a) real inverted and of the same size as that  of the object

(b) virtual, erect and of the same size as  that of the object

(c) real inverted and bigger than the size of  the object

(d) virtual erect and bigger than the size of  the object

Answer: (b) virtual, erect and of the same size as that of the object

Q. 17) A person standing in front of mirror found that his image is of same height. this implies that the mirror is:

(a) concave (b) plane
(c) convex (d) either (a) or (b)

Answer: (d) either (a) or (b)

Explanation: Plane mirror always form
image, of the same size as an object. In case
of concave mirror, when an object is placed at
radius of curvature the size of image equal that
of an object.

## mcq questions for class 10 science term 1 2021

Q. 18) According to the new cartesian sign
convention:

(a) focal length of concave mirror is negative that of convex mirror is positive

(b) focal length of concave mirror is positive and that of convex mirror is negative

(c) focal length of both concave and convex mirrors is negative

(d) focal length of both concave and convex mirrors is positive

Answer: (a) focal length of concave mirror is negative and that of convex mirror is positive

Explanation: : In case of concave mirror, the
centre of curvature and focus lie in front of
the surface of the mirror. Thus, the radius
of curvature and focal length are taken as
negative.

Q. 19) Name the phenomena due to which we see a delayed sunset.

(a) Atmospheric reflection
(b) Internal reflection
(c) Atmospheric refraction
(d) Internal refraction

Explanation: The Advancement in sunrise and
delayed sunset are the two phenomena that
are caused due to the atmospheric refraction
process. In this process the Sun appears to rise
early by 2 minutes and set by 2 minutes late.

Q. 20) The colour of sky as seen by an astronaut in space would be black due to:

(a) No scattering of light taking place in space

(b) No atmospheric refraction taking place in space

(c) No dispersion of light taking place in space

(d) Both (b) and (c)

Answer: (a) No scattering of light taking place in space

Explanation: The sky would appear to be black to astronaut in space as there is no atmosphere to scatter the sun’s light.

Q. 21) Which of the metals react with dilute Nitric acid and evolve hydrogen gas?

(I) P (II) Mg
(III) Mn (IV) Zn

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

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

Explanation: H2 gas is not evolved when a metal reacts with HNO3 (nitric acid) as HNO3
is a strong oxidizing agent and oxidizes the H2
produced to water and is itself reduced to any
of the oxides of nitrogen. However, Mg and Mn are exceptions as they react with very dilute Nitric acid to evolve H2 gas.

## mcq questions for class 10 science term 1 2021 board exam

Q. 22) The changes that do not happen to the food in the small intestine before its absorption are:

(a) proteins are converted to amino acids

(b) Carbohydrates are converted to glucose

(c) Fats are emulsified

(d) Fats are converted to fatty acids and  glycerol

Explanation: The emulsification of fat takes
place by the action of bile salts.

Q. 23) The part of nephron that filters the blood passing through it is:

(a) Bowman’s capsule
(b) Glomerulus
(c) Renal artery
(d) Collecting duct

Explanation: Glomerulus are the bundle of
blood capillaries present in the Bowman’s
capsule. One end of the glomerulus is
attached to the renal artery (it brings dirty

Q. 24) Select the correct statements :

(I) Effect of root pressure in transport of  water is more important during day.

(II) Effect of root pressure in transport of  water is more important at night.

(III) Transpiration pull is the major driving  force in the movement of water in xylem  during the day.

(IV)Transpiration pull is the major driving  force in the movement of water in xylem  during the night.

(a) Both I and III

(b) Both II and III

(c) Both I and IV

(d) Both II and IV

Answer; (C) (b) Both II and III

Explanation : The effect of root pressure in
transport of water is more important at night
as during the day, transpiration pull is the
major driving force in the movement of water
in xylem

Q. 25) In the human heart, the oxygen rich blood from the lungs first comes to:

(a) Left atrium
(b) Left ventricle
(c) Right atrium
(d) Right ventricle

Explanation: In the human heart, the oxygen
rich blood from the lungs first comes to the left
atrium which relaxes when it collects the blood from where it goes to the left ventricle and is then pumped out to the body.

Q. 26) Which of the following are not uses of
concave mirror:

(a) In search lights