CBSE Class X – Science Chemistry + Biology + Physics Exam (Full Syllabus)

This test is designed based on NCERT Syllabus for Class 10 Topics of Science – Chemistry , Biology and Physics

Each time random 25 questions will be displaced from the question bank of 500 + Questions
So we recommend you to retake the quiz till you have mastered all the questions

1 / 25

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed. Identify the brown gas X evolved.

X is nitrogen dioxide gas (NO<sub>2</sub>) that has evolved as brown, choking fumes

X is copper oxide gas that has evolved as brown, choking fumes

X is oxygen gas that has evolved as brown, choking fumes.

none of these

2 / 25

Calcium oxide reacts vigorously with water to produce slaked lime. CaO(s) + H₂O(l) → Ca(OH)₂(aq) This reaction can be classified as:

Combination reaction

Exothermic reaction

Endothermic reaction

Oxidation reaction

1 and 3

3 and 4

1, 3 and 4

1 and 2

3 / 25

To preserve tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

Acidic

Neutral

Basic

Corrosive

4 / 25

What types of ions are formed when an acid is dissolved in water ?

H+ ions are formed

H<sub>2</sub>0 +

OH- ions

None

5 / 25

What occurs when calcium is treated with water?

It does not react with water.

It reacts violently with water. I

t reacts less violently with water.

Bubbles of hydrogen gas formed stick to the surface of calcium.

3 and 4

1 and 3

2 and 3

1 and 4

6 / 25

Hydrogen gas is not evolved when a metal reacts with nitric acid because

nitric acid is a strong oxidising agent.

nitric acid is a strong reducing agent.

nitric acid is a strong neutralising agent.

non of these

7 / 25

Which of the followings is the major constituent of the liquefied petroleum gas?

Methane

Ethane

Propane

Butane

8 / 25

Which of the following statements about graphite and diamond is true?

They have the same crystal structure

They have the same degree of hardness

They have the same electrical conductivity

They can undergo the same chemical reactions

9 / 25

The molecular formula of Ethanol

C₂H₆OH

C₂H₇OH

C₂H₅OH

C₂HOOH

10 / 25

Where would you establish the element with electronic confguration 2, ǫ in the modern periodic table?

Group 8

Group 2

Group 18

Group 10

11 / 25

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following classification does the element belong?

Metal

Metalloid

Non-metal

Left-hand side element

12 / 25

Is it necessary to separate oxygenated and deoxygenated blood in mammals and birds.

Yes

No

May be yes

May be no

13 / 25

Name an enzyme present in pancreatic juice

Trypsin

lipase

lipase & Trypsin

none of these

14 / 25

What is the mode of asexual reproduction in Amoeba?

Binary Fission

Fragmentation

Budding

Regeneration Or Budding

15 / 25

In flowers,what is the female reproductive part called as?

Pistil Or Carpel

Ovaries

Filaments

Stigma

16 / 25

Which pollination increases genetic uniformity and decreases variations

Cross Pollination

Self Pollination

Both 1 & 2

None Of These

17 / 25

Assertion (A) : A single copy of ‘T’ is enough to make the plant tall. Reason (R) : Tallness trait (T) in Mendel’s experiment is a dominant trait.

Both (A) and (R) are true and (R) is correct explanation of the assertion

Both (A) and (R) are true but (R) is not the correct explanation of the assertion

(A) is true but (R) is false

(A) is false but (R) is true

18 / 25

The major function of cellular DNA is

to store information and pass it to ofspring.

to store information and pass it to parents.

to store information and not pass it to ofspring.

none of these

19 / 25

Arjun remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,Name two observations which can be explained by the above phenomenon.

Rainbow formation,Tyndall effect

Twinkling of stars, advance sunrise, delayed sunset

both 1 &2

none

20 / 25

Why don’t planets twinkle?

Intensity of light entering our eye is infinity

Intensity of light entering our eye is one.

Intensity of light entering our eye is zero.

Intensity of light entering our eye is two.

21 / 25

The colour of scattered light depends on the

size of the scattering particle

frequency of the scattering particle

distanceof the scattering particle

22 / 25

Ohm’s law express that:

Resistance increases as current increases

Resistance decreases as current increases

Resistance increases as voltage increases

Current increases as voltage increases

23 / 25

The rate at which electrical work is done or the rate at which electrical energy is consumed

Electrical power

electrical inductivity

electrical resistivity

none

24 / 25

The nature of magnetic field line passing through the centre of current carrying circular loop is:

circular

ellipse

parabolic

straight line

25 / 25

when an iron core is inserted into a current carrying solenoid

strength of the magnetic field produced inside the solenoid remains unchanged

strength of the magnetic field produced inside the solenoid decreases

strength of the magnetic field produced inside the solenoid increases

no effect

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CBSE Class X – Science Chemistry + Biology + Physics Exam (Full Syllabus)

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