CBSE 10 Science Question paper-2019 by Pavan | Practice Test to Test Your Knowledge
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CBSE 10 Science Question paper-2019

CBSE 10 Science Question paper-2019

This mock test includes actual CBSE Class 10 Science board exam questions from the year 2019, helping students understand exam trends and practice real paper formats.

2025-07-28
Pavan Pavan
CBSE Class 10 Science 2019 Grade 10

Duration

20 min

Questions

30

Marking

Negative

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Questions Preview

If the potential difference across the two ends of a conductor is 5 V and the current through it is 0·2 A, then what is the resistance of the conductor?

A
25 Ω
B
20 Ω
C
15 Ω
D
10 Ω

Write the major hazard of nuclear power generation.

A
Radioactive waste
B
High cost
C
Risk of explosion
D
Noise pollution

Draw a labelled ray diagram to show the path of the reflected ray corresponding to the ray which is incident obliquely to the principal axis, towards the pole of a convex mirror. Mark the angle of incidence and angle of reflection on it.

A
Ray diagram showing reflection in convex mirror
B
Ray diagram showing reflection in concave mirror
C
Ray diagram showing refraction
D
Ray diagram showing diffraction

What is the principle of an electric motor? State the rule which is applied to determine the direction of force experienced by a current carrying conductor when kept in a magnetic field.

A
Lorentz Force Law
B
Fleming’s Left-Hand Rule
C
Right Hand Thumb Rule
D
Faraday’s Law of Induction

What is the chemical formula of the acid present in ant sting? Also, give the common method to get relief from the discomfort caused by the ant sting.

A
Formic acid, Relief by applying baking soda
B
Acetic acid, Relief by applying vinegar
C
Hydrochloric acid, Relief by applying salt
D
Sulfuric acid, Relief by applying aloe vera

What is a food chain? Why is the flow of energy in an ecosystem unidirectional?

A
A sequence of organisms feeding on each other. Energy flows in one direction.
B
A sequence of chemical reactions. Energy can flow in multiple directions.
C
A hierarchy of species in a habitat. Energy circulates in all directions.
D
A type of biological cycle. Energy flows in a cyclic manner.

What is a dam? List two main advantages and two ill effects of constructing a big dam.

A
Dams store water. Advantages: irrigation, flood control. Ill effects: displacement, ecosystem disruption.
B
Dams produce electricity. Advantages: clean energy, tourism. Ill effects: pollution, water shortage.
C
Dams increase water level. Advantages: power generation, water purification. Ill effects: climate change, landslides.
D
Dams regulate river flow. Advantages: trade, transportation. Ill effects: acidification, decreased biodiversity.

What is the principle of an electric motor? State the rule which is applied to determine the direction of force experienced by a current carrying conductor when kept in a magnetic field.

A
Lorentz Force Law
B
Fleming’s Left-Hand Rule
C
Right Hand Thumb Rule
D
Faraday’s Law of Induction

How does the nervous system perform the function of control and coordination in human beings?

A
By sending electrical signals
B
By secreting hormones
C
By controlling involuntary muscles
D
By regulating body temperature

What is the genetic cause of concern due to the decrease in the number of surviving tigers?

A
Inbreeding depression
B
Gene mutation
C
Natural selection
D
Gene flow

What is the formula of ferrous sulphate and its reaction with heat?

A
FeSO4, Decomposes to form Fe2O3
B
FeSO4, Forms iron oxide
C
FeSO4, No reaction upon heating
D
FeSO4, Forms sulfur dioxide

In the reaction between copper and oxygen, what is the black substance formed?

A
Copper oxide
B
Copper sulfate
C
Copper chloride
D
Copper hydroxide

In the industrial process for the manufacture of sodium hydroxide, which gas is formed as a by-product?

A
Chlorine
B
Oxygen
C
Nitrogen
D
Carbon dioxide

What is the type of ore that reacts with dilute hydrochloric acid to produce brisk effervescence?

A
Carbonate ore
B
Sulphide ore
C
Oxide ore
D
Silicate ore

What is the chemical equation when sodium reacts with water?

A
2Na + 2H2O → 2NaOH + H2
B
Na + H2O → NaOH + H2
C
Na2 + H2O → NaOH
D
Na + 2H2O → NaOH + 2H2

What is the focal length of a concave mirror and the image formed when an object is placed at a distance of 30 cm?

A
Concave mirror forms an inverted image.
B
Concave mirror forms an erect image.
C
Concave mirror does not form an image.
D
Concave mirror forms a diminished image.

Which of the following is a property of a convex lens?

A
It converges light rays
B
It diverges light rays
C
It bends light rays towards the source
D
It does not affect light rays

A concave mirror of focal length 20 cm forms a real image of a 5 cm object at a distance of 30 cm. What is the nature of the image?

A
Inverted and real
B
Erect and virtual
C
Inverted and virtual
D
Erect and real

What is the type of image formed by a convex lens when the object is placed beyond 2F?

A
Inverted and diminished
B
Erect and magnified
C
Inverted and magnified
D
Erect and diminished

In an experiment with a convex lens, when the object is at infinity, the image formed is at what location?

A
At the focal point
B
At twice the focal point
C
At the center of curvature
D
At infinity

What is the primary reason for the increased levels of carbon dioxide in the atmosphere?

A
Deforestation
B
Overpopulation
C
Industrialization
D
Burning fossil fuels

What is the basic principle of the process of filtration?

A
Separation of components based on solubility
B
Separation of components based on particle size
C
Separation of components based on density
D
Separation of components based on polarity

What is the common method used to get relief from the discomfort caused by an ant sting?

A
Apply baking soda
B
Apply ice
C
Apply vinegar
D
Apply honey

What is the type of image formed by a concave mirror when the object is placed at the focal point?

A
No image formed
B
Inverted and real
C
Erect and virtual
D
Inverted and magnified

In the process of electrolysis, what is the role of the electrolyte?

A
To conduct electricity
B
To produce a current
C
To separate ions
D
To balance charge

What is the chemical equation for the formation of sodium hydroxide from sodium and water?

A
2Na + 2H2O → 2NaOH + H2
B
Na + H2O → NaOH + H2
C
Na + 2H2O → NaOH + 2H2
D
Na2 + H2O → NaOH

What is the role of sulfuric acid in the production of hydrogen gas?

A
It reacts with zinc to produce hydrogen gas
B
It decomposes water to produce hydrogen
C
It reacts with sodium chloride to form hydrogen
D
It reacts with potassium to produce hydrogen

What happens when zinc reacts with dilute hydrochloric acid?

A
Zinc dissolves to form zinc chloride and hydrogen gas
B
Zinc forms a white precipitate
C
Zinc forms a green solution
D
No reaction occurs

What is the chemical formula of sodium carbonate?

A
Na2CO3
B
NaCO3
C
Na2O
D
NaCl

What is the difference between self-pollination and cross-pollination?

A
Self-pollination occurs within the same flower, cross-pollination occurs between different flowers
B
Self-pollination requires insects, cross-pollination does not
C
Self-pollination produces genetically diverse offspring
D
Cross-pollination is more common in monocots