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Class 10 Science PT 1 Exam 2023-24

Total questions: 84

Worksheet time: 1hrs 25mins

Name
Class
Date
1.

Which of the statements about the reaction below are incorrect?

2PbO(s) + C(s) → 2Pb(s) + CO2(g)

i. Lead is getting reduced.

ii. Carbon dioxide is getting oxidized.

iii. Carbon is getting oxidized.

iv. Lead oxide is getting reduced.→

a)

(i) and (ii)

b)

(i) and (iii)

c)

(i), (ii) and (iii)

d)

(iv) only

2.

Which of the following is not a balanced equation?

a)

H2+ O2→H2O

b)

Mg + CuSO2→MgSO4+ Cu

c)

NaOH + HCI→NaCI + H2O

d)

Zn + S ⟶ ZnS

3.

Aluminum reacts with copper sulphate to produce

a)

Cu and Al2(SO4)3

b)

CuO and Al2(SO4)3

c)

Cu, Al2S3Al2S3 and SO2

d)

CuO, Al2S3Al2S3 and SO2

4.

What happens when dilute HCl is added to iron filings? Tick the correct answer.

a)

Chlorine gas and iron hydroxide are produced.

b)

Iron salt and water are produced.

c)

Hydrogen gas and iron chloride are produced.

d)

No reaction takes place.

5.

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

i. It is an endothermic reaction

ii. It is an exothermic reaction

iii. The pH of the resulting solution will be more than seven

iv. The pH of the resulting solution will be less than seven

a)

(i) and (ii)

b)

(ii) and (iii)

c)

(i) and (iv)

d)

(iii) and (iv)

6.

Which among the following are endothermic processes?

i. Reaction of quick lime with water

ii. Dilution acid with water

iii. Evaporation of water

iv. Sublimation of solid ammonium chloride

a)

(i) and (ii)

b)

(ii) and (iii)

c)

(i) and (iv)

d)

(iii) and (iv)

7.

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involve?

i. Displacement reaction

ii. Precipitation reaction

iii. Combination reaction

iv. Double displacement reaction

a)

(i), (iii)

b)

(ii), (iii)

c)

(iii)

d)

(ii), (iv)

8.

The electrolytic decomposition of water gives H2and O2 in the ratio of

a)

1:2 by volume

b)

2:1 by volume

c)

1:2 by mass

d)

8:1 by mass

9.

Which of the following is not a physical change?

a)

Boiling of water to give water vapour

b)

Melting of ice to give water

c)

Dissolution of salt in water

d)

Combustion of Liquefied Petroleum Gas (LPG)

10.

Which of the following are exothermic processes?

1. Reaction of water with quick lime

2. Dilution of an acid

3. Evaporation of water

4. Sublimation of camphor (crystals)

a)

1 and 2

b)

2 and 3

c)

1 and 4

d)

3 and 4

11.

Which of the following product is formed when calcium oxide reacts with water?

a)

Slaked lime

b)

Carbon dioxide

c)

Calcium oxide

d)

Oxygen gas

12.

What is the another name of quick lime?

a)

Calcium hydroxide

b)

Calcium oxide

c)

Carbon dioxide

d)

Sodium oxide

13.

What is the chemical name for slaked lime?

a)

Calcium carbonate

b)

Calcium oxide

c)

Calcium hydroxide

d)

Carbon monoxide

14.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All of the above

15.

In which of the following category will you put the reaction of heating of ferrous sulphate?

a)

Decomposition reaction

b)

Combination Reaction

c)

Displacement reaction

d)

All of the above

16.

In which of the following category will you put the reaction of heating of calcium carbonate?

a)

Decomposition reaction

b)

Thermal decomposition reaction

c)

Endothermic reaction

d)

All of the above.

17.

Which of the following product is formed after heating of limestone?

a)

Calcium oxide

b)

Calcium carbonate

c)

Hydrogen gas

d)

All of the above

18.

What happens when silver chloride is put under sunlight?

a)

Silver metal and chlorine gas are formed

b)

Silver metal and hydrogen gas are formed

c)

Only silver metal is formed

d)

Only hydrogen gas is formed

19.

Which of the following is formed when lead nitrate is put under thermal decomposition?

a)

Lead oxide

b)

Nitrogen dioxide

c)

Oxygen gas

d)

All of the above

20.

What happens when carbon dioxide is passed in lime water?

a)

Lime water turns milky because of formation of calcium carbonate

b)

Lime water turns milky because of formation of water

c)

Lime water turns red because of formation permanganate

d)

Lime water turns red because of formation of copper sulphate

21.

Which of the following gives energy while respiration?

a)

Burning of coal

b)

Burning of natural gas

c)

Burning of oxygen

d)

Burning of glucose

22.

Why magnesium ribbon is cleaned before burning?

a)

To remove dust

b)

To remove magnesium oxide

c)

To remove ribbon oxide

d)

All of the above

23.

What is the name of reaction in which both oxidation and reduction takes place?

a)

Combination reaction

b)

Thermal decomposition

c)

Displacement reaction

d)

Redox reaction

24.

Which of the following is termed as endothermic reaction?

a)

Reaction in which heat is evolved

b)

Reaction in which heat is absorbed

c)

Reaction in which there is loss of oxygen

d)

Reaction in which there is gain of hydrogen

25.

Which of the reaction is used in black and white photography?

a)

Combination reaction

b)

Decomposition reaction

c)

Displacement reaction

d)

Oxidation reaction

26.

Which of the following is the first site for the exchange of inhaled air?

a)

Blood capillaries of lungs

b)

Alveoli of lungs

c)

Left auricle of the heart

d)

Blood capillaries adjacent to body cells

27.

Lymph does not comprise of

a)

Red Blood Corpuscles

b)

Lymphocytes

c)

Leucocytes

d)

Nitrogenous Waste

28.

Crocodiles have ______ chambered heart.

a)

two

b)

three

c)

four

d)

none of these

29.

An enzyme 'X' that converts starch to simple sugars is also the first enzyme to mix with food in the digestive tract. Identify 'X'

a)

Pepsin

b)

Amylase

c)

Lipase

d)

None of these

30.

Which among of the following substances are reabsorbed in the nephron?

a)

Urea, Uric acid, Amino acid

b)

Glucose, Amino acids, Salts

c)

Glucose, Urea, Creatinine

d)

KCl, Urea, Glucose

31.

How is food transported to the food vacuole of paramecium?

a)

By movement of cilia

b)

By pseudopodia

c)

Food vacuole directly captures the food

d)

By contractile vacuole

32.

The process of obtaining food to meet the energy demands of the body is known as _____.

a)

Excretion

b)

Respiration

c)

Nutrition

d)

Circulation

33.

The process that involves oxidation of food to release energy is known as _____

a)

Breathing

b)

Excretion

c)

Circulation

d)

respiration

34.

what could be the possible explanation for the evolution of a four-chambered heart in mammals as opposed to a two-chambered heart in fishes?

a)

In fishes oxygenation of blood takes place in heart.

b)

Fishes have efficient gills.

c)

Fishes can store more energy than mammals.

d)

Fishes do not require energy to maintain their body temperature.

35.

What happens to the unused carbohydrates produced in the plant body?

a)

Gets broken down and dissipated as heat.

b)

Transported to stem in the form of glycogen.

c)

Expelled from plant body through excretion.

d)

Stored in the form of starch for future use.

36.

Saliva in the mouth converts _______ into _______________.

a)

Proteins, amino acids

b)

glycogen, glucose

c)

starch, maltose

d)

fats, vitamins

37.

Name the tissue in a leaf where plastids are present_____

a)

Endodermis

b)

Epithelial cell

c)

Mesophyll

d)

Mitochondria

38.

Name the tissue responsible for the transportation of sugar and amino acids in plants.

a)

Xylem

b)

Stomata

c)

root hairs

d)

Phloem

39.

Assertion: Lungs become empty after the forceful expiration.

Reason: The forcefully exhaled air is called the residual volume of air.

a)

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

b)

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

c)

A is true but R is false.

d)

Both A and R are false.

40.

A: The length of the small intestine in cows is longer than in tigers.

R: Cellulose digestion takes lesser time than the digestion of flesh.

a)

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

b)

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

c)

A is true but R is false.


d)

A is false but R is true.

41.

A: Walls of the intestine have numerous villi.

R: These villi increase the surface area of digestion.

a)

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

b)

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

c)

A is true but R is false.

d)

A is false but R is true.

42.

A: Lipase helps in the emulsification of fats.

R: Lipase hydrolyses fats and oils.

a)

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


b)

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


c)

A is true but R is false.

d)

A is false but R is true,

43.

A: When air is passed through lime water, it turns milky.

R: air contains 78% nitrogen and 21% oxygen.


a)

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

b)

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

c)

A is true but R is false.

d)

A is false but R is true.

44.

Choose the correct function of the given structure.

a)

Gaseous exchange

b)

Absorbs salt and water.

c)

Reabsorption of urea and uric acid

d)

none of these

45.

Identify the structure.

a)

Nephron

b)

Alveolar sac

c)

Alimentary canal

d)

None of these

46.

Bouncing of a light ray when it strikes a reflecting surface is called.........

a)

Refraction

b)

Dispersion

c)

Reflection

d)

Diffraction

47.

which of the following is not a property of the image formed by a [lane mirror?

a)

virtual and erect

b)

Object size = image size

c)

object distance = image distance

d)

Real and inverted

48.

Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the above figure.

The correct way of measuring accurate focal length of the mirror is

a)

A

b)

B

c)

C

d)

D

49.

which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in the figure 10.6?

a)

A

b)

B

c)

C

d)

D

50.

Convex mirror is also called as

a)

converging mirror

b)

diverging mirror

c)

plane mirror

d)

silver mirror

51.

The relation between focal length and radius of curvature is

a)

R = 2f

b)

1/f = 2R

c)

f = R/2

d)

R = 2/f

52.

The point on the spherical mirror at the middle of the surface is called

a)

focus

b)

centre of curvature

c)

pole

d)

radius of curvature

53.

The focal length of a plane mirror is ........

a)

infinite

b)

zero

c)

1m

d)

100m

54.

A convex mirror has a focal length 12 cm. Then its radius of curvature is ........ cm

a)

24

b)

12

c)

6

d)

1.2

55.

When the object is in between the centre of curvature (C) and focus (F) of a concave mirror, then the position of the image is ...........

a)

At focus

b)

At the centre of curvature

c)

at infinity

d)

beyond the centre of curvature

56.

Which of the following characteristic of an image formed for a convex mirror?

a)

Enlarged size

b)

virtual image

c)

Real image

d)

inverted image

57.

Which mirror is shown in the figure?

a)

convex mirror

b)

concave mirror

c)

plane mirror

d)

silver mirror

58.

When the object is at infinity, a point sized image is formed at ................ by the convex mirror

a)

focus behind the mirror

b)

focus in front of the mirror

c)

radius of curvature

d)

principal axis

59.

The image formed by a concave mirror when the object is placed between the pole and the focus is ......

a)

virtual, erect and magnified

b)

virtual, erect and diminished

c)

real, inverted and magnified

d)

real, inverted and diminished

60.

The angle of incidence of a ray of light passing through the centre of curvature of a concave mirror is ........... degree

a)

105

b)

180

c)

90

d)

0

61.

According to laws of reflection,

a)

angle of incidence > angle of reflection

b)

angle of incidence < angle of reflection

c)

angle of incidence = angle of reflection

d)

both 1 and 2

62.

Where will be the images of the Sun or the moon are formed by a concave mirror?

a)

Focus

b)

Pole

c)

centre of curvature

d)

beyond centre of curvature

63.

What is the size of the image formed when an object is kept at the focus in front of concave mirror?

a)

enlarged

b)

diminished

c)

highly enlarged

d)

highly diminished

64.

Which of the following is a concave mirror?

a)
b)
c)
d)
65.

Light enters the eye through a thin membrane called the

a)

Iris

b)

Pupil

c)

Retina

d)

Cornea

66.

Following controls and regulates the amount of light entering the eye

a)

Iris

b)

Pupil

c)

Retina

d)

Corena

67.

An image is formed on

a)

Iris

b)

Pupil

c)

Retina

d)

Cornea

68.

The shape of eye-ball is nearly _________________

a)

Elliptical

b)

Oval

c)

Circular

d)

Spherical

69.

_________________ send signals to the brain

a)

Optical nerve

b)

Aqueous Humour

c)

Viterous humour

d)

Eye lens

70.

When the light is very bright, the diameter of pupil

a)

Expends

b)

Contract

c)

Remain same

d)

All of these

71.

When an object is placed closer to eye ____________

a)

the ciliary muscles contract

b)

curvature of the eye lens increases

c)

Eye lens become thicker

d)

All of the above

72.

To see an object comfortably and distinctly, we must hold it about _______ cm from our eyes.

a)

10

b)

25

c)

15

d)

infinity

73.

The ability of the eye lens to adjust its focal length is called

a)

Accommodation

b)

Accomplish

c)

Composition

d)

None of the above

74.

The farthest point upto which the eye can see objects clearly is ____________ for a normal eye.

a)

25 cm

b)

15 cm

c)

infinity

d)

1 km

75.

Following is far-sightedness

a)

Myopia

b)

Hypermetropia

c)

Presbyopia

d)

All of the above

76.

The person who is suffering from the following disease cannot donate eyes.

a)

diabetes

b)

asthma

c)

hypertension

d)

tetanus

77.

The person who is suffering from _____________ requires bi-focal lens.

a)

(a) Hypermetropia

b)

(b) Myopia

c)

both option(a) and (b)

d)

none of these

78.

Following is true for Hypermetropia

a)

It can be corrected by using a convex lens

b)

It may arise when focal length of eye lens is too long

c)

it may arise when eyeball has become too small

d)

all of above

79.

Having two eyes facilitates in

A: Increasing the field of view

B: Bringing three-dimensional view

C: Developing the concept of distance/size

Then the correct option is/are

a)

A only

b)

A and B only

c)

B only

d)

A,B and C

80.

the black opening between the aqueous humour and the lens is called

a)

retina

b)

iris

c)

cornea

d)

pupil

81.

The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called

a)

far-sightedness

b)

near-sightedness

c)

presbyopia

d)

All of above

82.

Myopia and Hypermetropia can be corrected by

a)

Concave and plano-convex lens

b)

Concave and convex lens

c)

Convex and concave lens

d)

Plano-concave lens for both defects.

83.

The image formed on the retina of the human eye is

a)

virtual and inverted

b)

real and inverted

c)

virtual and erect

d)

real and erect

84.

When the light rays enters the eye, most of the refraction occurs at the

a)

crystalline lens

b)

outer surface of cornea

c)

iris

d)

pupil

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