CBSE 10 Science Question Paper-2023 Set-1 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 10 Science Question Paper-2023 Set-1
CBSE 10 Science Question Paper-2023 Set-1

CBSE 10 Science Question Paper-2023 Set-1

This mock test includes actual CBSE Class 10 Science board exam questions from the year 2023 Set-1, 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

20

Marking

Negative

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Questions Preview

When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out. The chemical equation for the reaction involved is:

A
KI + PbNO3 PbI + KNO3
B
2KI + Pb(NO3)2 PbI2 + 2KNO3
C
KI + Pb(NO3)2 PbI + KNO3
D
KI + PbNO3 PbI2 + KNO3

When Sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is:

A
Hydrogen; it gives pop sound with burning match stick.
B
Hydrogen; it turns lime water milky.
C
Carbon dioxide; it turns lime water milky.
D
Carbon dioxide; it blows off a burning match stick with a pop sound.

The acid present in tomato is:

A
Methanoic acid
B
Acetic acid
C
Lactic acid
D
Oxalic acid

A metal ribbon ‘X’ burns in oxygen with a dazzling white flame forming a white ash ‘Y’. The correct description of X, Y and the type of reaction is:

A
X = Ca; Y = CaO; Type of reaction = Decomposition
B
X = Mg; Y = MgO; Type of reaction = Combination
C
X = Al; Y = Al2O3; Type of reaction = Thermal decomposition
D
X = Zn; Y = ZnO; Type of reaction = Endothermic

The name of the salt used to remove permanent hardness of water is:

A
Sodium hydrogen carbonate (NaHCO3)
B
Sodium chloride (NaCl)
C
Sodium carbonate decahydrate (Na2CO3.10H2O)
D
Calcium sulphate hemihydrate (CaSO4.1/2H2O)

When Sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is:

A
Hydrogen; it gives pop sound with burning match stick.
B
Hydrogen; it turns lime water milky.
C
Carbon dioxide; it turns lime water milky.
D
Carbon dioxide; it blows off a burning match stick with a pop sound.

The electron dot structure of chlorine molecule is:

A
Cl-Cl
B
Cl:Cl
C
Cl::Cl
D
Cl—Cl

Which of the following is the acid present in tomatoes?

A
Methanoic acid
B
Acetic acid
C
Lactic acid
D
Oxalic acid

The number of chromosomes in parents and offsprings of a particular species undergoing sexual reproduction remain constant due to:

A
Doubling of chromosomes after zygote formation.
B
Halving of chromosomes after zygote formation.
C
Doubling of chromosomes before gamete formation.
D
Halving of chromosomes at the time of gamete formation.

A metal ribbon ‘X’ burns in oxygen with a dazzling white flame forming a white ash ‘Y’. The correct description of X, Y and the type of reaction is:

A
X = Ca; Y = CaO; Type of reaction = Decomposition
B
X = Mg; Y = MgO; Type of reaction = Combination
C
X = Al; Y = Al2O3; Type of reaction = Thermal decomposition
D
X = Zn; Y = ZnO; Type of reaction = Endothermic

In plants, the role of cytokinin is:

A
Promote cell division.
B
Wilting of leaves.
C
Promote the opening of stomatal pore.
D
Help in the growth of stem.

Which of the following is an incorrect statement about DNA?

A
DNA has the complete information for a particular characteristic.
B
DNA is the molecule responsible for the inheritance of characters from parents to offspring.
C
Change in information will produce a different protein.
D
Characteristics will remain the same even if protein changes.

The acid present in tomatoes is:

A
Methanoic acid
B
Acetic acid
C
Lactic acid
D
Oxalic acid

During adolescence, reproductive phase starts and:

A
General growth rate begins to slow down.
B
Height becomes less.
C
The body weight is reduced.
D
Hair growth decreases.

When Sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is:

A
Hydrogen; it gives pop sound with burning match stick.
B
Hydrogen; it turns lime water milky.
C
Carbon dioxide; it turns lime water milky.
D
Carbon dioxide; it blows off a burning match stick with a pop sound.

Which pair of sex chromosomes will determine a male?

A
XO
B
XX
C
XY
D
YY

One of the events that does not occur during photosynthesis is:

A
Chlorophyll absorbs solar energy.
B
Carbon dioxide is released during the process.
C
Oxygen is released during the process.
D
Carbon dioxide is absorbed during the process.

Observe the following diagram and identify the process and its significance:

A
Evaporation: maintains water contents in leaf cells.
B
Transpiration: creates a suction force which pulls water inside the plant.
C
Excretion: helps in excreting out waste water from the plant.
D
Translocation: helps in transporting materials from one cell to another.

An alpha particle enters a uniform magnetic field as shown. The direction of force experienced by the alpha particle is:

A
Towards right
B
Towards left
C
Into the page
D
Out of the page

During adolescence, reproductive phase starts and:

A
General growth rate begins to slow down.
B
Height becomes less.
C
The body weight is reduced.
D
Hair growth decreases.