CBSE 10 Science Questio Paper-2023 Set-3 by Pavan | Practice Test to Test Your Knowledge
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  2. Practice Tests
  3. CBSE 10 Science Questio Paper-2023 Set-3
CBSE 10 Science Questio Paper-2023 Set-3

CBSE 10 Science Questio Paper-2023 Set-3

This mock test includes actual CBSE Class 10 Science board exam questions from the year 2023 set 3, helping students understand exam trends and practice real paper formats

2025-07-30
Pavan Pavan
CBSE Class 10 Science 2023 Grade 10

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

Which of the following is an example of an endothermic process?

A
Formation of slaked lime
B
Decomposition of vegetable matter into compost
C
Dissolution of ammonium chloride in water
D
Digestion of food in our body

What is formed when zinc reacts with sodium hydroxide?

A
Sodium oxide
B
Sodium zincate
C
Zinc hydroxide
D
Zinc oxide

Which of the following is a metal with the lowest density?

A
Lithium
B
Lead
C
Magnesium
D
Aluminium

Which plant bears unisexual flowers?

A
Mustard and Papaya
B
Hibiscus and Watermelon
C
Mustard and Hibiscus
D
Watermelon and Papaya

Which of the following reactions occurs when a bacterium divides into two?

A
DNA copying with small inaccuracies
B
DNA copying with large inaccuracies
C
Reproduction without any inaccuracies
D
No inaccuracies in DNA copying

What is the first step in the breakdown of glucose during aerobic respiration?

A
Glycolysis
B
Krebs cycle
C
Electron transport chain
D
Fermentation

Which of the following is the correct explanation of why the clear sky appears blue?

A
Scattering of blue light
B
Absorption of light by the atmosphere
C
Reflection of sunlight by clouds
D
Refraction of light by air

What is the hormone released in humans during scary situations?

A
Adrenaline
B
Insulin
C
Thyroxine
D
Cortisol

Which of the following statements is true about the magnetic field?

A
Magnetic field lines always intersect
B
Magnetic field lines are imaginary lines
C
Magnetic field lines do not exist
D
Magnetic field lines are parallel

What is the relationship between the readings of ammeter A1 and A3 in the given circuit diagram?

A
A1 and A3 show equal readings
B
A1 is half of A3
C
A3 shows double the reading of A1
D
A1 and A3 show inverse readings

Which of the following is true for a convex mirror with an object placed at infinity?

A
The image formed is virtual and diminished
B
The image formed is real and diminished
C
The image formed is real and enlarged
D
The image formed is virtual and magnified

What is the power of a lens with a focal length of 10 cm?

A
0.1 diopter
B
1 diopter
C
10 diopters
D
0.5 diopters

Which of the following elements has the highest atomic number?

A
Lithium
B
Carbon
C
Oxygen
D
Uranium

Which muscle controls the movement of food from the mouth to the stomach?

A
Smooth muscle
B
Skeletal muscle
C
Cardiac muscle
D
Voluntary muscle

What is the main reason for cramps during vigorous exercise?

A
Lactic acid accumulation in muscles
B
Lack of oxygen in muscles
C
Dehydration
D
Excessive stretching of muscles

What is formed when silver chloride is exposed to sunlight?

A
Silver oxide
B
Silver metal
C
Silver nitrate
D
Silver sulfide

What is the main function of the sphincter muscles?

A
To control the movement of food
B
To break down food
C
To filter blood
D
To absorb nutrients

What is the formula for calculating the magnification of an object?

A
Magnification = Image size / Object size
B
Magnification = Object size / Image size
C
Magnification = Focal length / Object distance
D
Magnification = Object distance / Focal length

What happens when an object is placed at the focus of a concave mirror?

A
The image is real and diminished
B
The image is virtual and magnified
C
The image is real and enlarged
D
No image is formed

What type of lens is used to correct hypermetropia?

A
Concave lens
B
Convex lens
C
Bifocal lens
D
Cylindrical lens

When and where does a rainbow appear in the sky? Draw a labelled ray diagram to show its formation.

A
When sunlight is refracted through raindrops in the sky.
B
When sunlight is absorbed by raindrops.
C
When light is scattered in the atmosphere.
D
When light reflects off the surface of water.

What is scattering of light? Why does the clear sky appear blue?

A
Scattering of light occurs when light interacts with molecules in the atmosphere, causing shorter wavelengths (blue) to scatter more.
B
Scattering occurs when light is absorbed by dust particles, and longer wavelengths scatter more.
C
Scattering is the reflection of light on water molecules.
D
Scattering occurs when light passes through transparent objects.

What is observed when aqueous solutions of potassium iodide and lead nitrate are mixed together? Name the type of reaction and write the chemical equation for the reaction that occurs.

A
A yellow precipitate of lead iodide is formed. This is a double displacement reaction. The equation is: Pb(NO3)2 + 2KI → PbI2 + 2KNO3
B
A white precipitate of lead chloride is formed. This is a double displacement reaction. The equation is: PbCl2 + KI → PbI2 + KCl
C
No reaction occurs.
D
A blue precipitate of lead nitrate is formed.

When copper powder is heated in a watch glass, a black substance is formed. Why is this black substance formed? Name it.

A
The black substance is copper oxide (CuO), formed due to oxidation of copper in the presence of oxygen.
B
The black substance is copper nitrate, formed by the reaction of copper with nitric acid.
C
The black substance is carbon dioxide, formed due to the reaction of copper with carbon.
D
The black substance is copper chloride, formed by copper reacting with chlorine.

Mendel crossed a pure tall pea plant (TT) with a pure short pea plant (tt) and obtained all tall plants in F1 generation. What is the gene combination present in the plants of F1 generation?

A
Tt
B
TT
C
tt
D
Tt or tt

What is the ratio of the plants obtained in the F2 generation when F1 plants are self-pollinated?

A
3:1
B
1:2:1
C
2:2
D
4:0

Explain how harmful chemicals enter our bodies through the food chain. Why is the concentration of these harmful chemicals found to be maximum in human beings?

A
Harmful chemicals enter the body through consumption of contaminated plants or animals. The concentration increases as it moves up the food chain due to biomagnification.
B
Harmful chemicals are absorbed directly by the skin. The concentration increases as they are stored in the liver.
C
The chemicals enter through the digestive system and are filtered by kidneys, which filter the highest amount in humans.
D
Harmful chemicals are only absorbed through the lungs, and the concentration is regulated by the immune system.

A student has focused the image of an object of height 3 cm on a white screen using a concave mirror of focal length 12 cm. If the distance of the object from the mirror is 18 cm, find the values of the following: (i) Distance of the image from the mirror (ii) Height of the image.

A
Image distance = -36 cm, Height of image = 6 cm
B
Image distance = 36 cm, Height of image = 6 cm
C
Image distance = 36 cm, Height of image = -6 cm
D
Image distance = -36 cm, Height of image = -6 cm

Define power of a lens. The focal length of a lens is 10 cm. Write the nature of the lens and find its power.

A
Power = 1/focal length. For a focal length of 10 cm, the power is +1 diopter. The lens is converging.
B
Power = 1/focal length. For a focal length of 10 cm, the power is -1 diopter. The lens is diverging.
C
Power = focal length^2. For a focal length of 10 cm, the power is 10 diopters.
D
Power = focal length x 2. For a focal length of 10 cm, the power is 20 diopters.

Explain the directional movement due to growth in response to touch in a pea plant.

A
The plant bends towards the source of touch due to the growth of cells on the opposite side of the stem.
B
The plant grows away from the touch stimulus, resulting in bending in the opposite direction.
C
The plant's growth is unaffected by touch and remains upright.
D
The plant stops growing upon receiving touch stimuli.