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

Which of the following reactions is an endothermic reaction?

Burning of coal.

Decomposition of vegetable matter into compost

Process of respiration.

Decomposition of calcium carbonate to form quick lime and carbon dioxide

3 / 25

Which of the following substances will not give carbon dioxide on treatment with dilute acid?

Marble

Limestone

Baking soda

Lime

4 / 25

Name the acid along present in ant sting

methanoic acid

sulphuric acid

Hydrochloric acid

none

5 / 25

2 ml each of conc. HCl, HNO₃, and a mixture of conc. HCl and conc. HNO3 in the ratio of 3:1 were taken in test tubes labelled as : A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be:

AI

Au

Cu

Pt

2 and 4

1

2

1 and 3

6 / 25

Name two metals having melting point less than 310 K (37°C).

gold & silver

mercury & silver

cesium (Cs) and gallium (Ga).

none of these

7 / 25

The compounds formed by the sharing of electron pairs between two atoms.

covalent compounds

ionic compounds

both 1 & 2

none

8 / 25

The compounds have low melting and boiling points.

covalent compounds

ionic compounds

molecular compounds

both 1 & 2

9 / 25

Rich conductors of electricity.

covalent compounds

ionic compounds

molecular compounds

All of these

10 / 25

Arrange the following elements in sequence of their increasing non-metallic character Li, O, C, Be and F.

F < O < C < Be < Li

Li < Be < C < O < F

F < O < C < Be < Li

F < O < Be < C < Li

11 / 25

What type of oxide would Eka-aluminium form?

EO₃

E₃O₂

E₂O₃

EO

12 / 25

Anaerobic process:

Takes place in yeast during fermentation.

Takes place in the presence of oxygen.

Produces only energy in the muscles of human beings.

Produces ethanol, oxygen and energy.

13 / 25

Human skin is impermeable to gas because

to minimise the loss of water from the skin

to maximise the loss of water from the skin

to minimise /maximise the loss of water from the skin

none of these

14 / 25

Fertilisation is the process of

Transfer of male gamete to female gamete

Fusion of nuclei of male and female gamete.

Adhesion of male and female reproductive organs

The formation of gametes by a reproductive organ

15 / 25

Name the organ that produces sperms in human males.

Testes

Testosterone

Both 1 & 2

None Of These

16 / 25

Tubectomy does not prevent the spread of sexually transmitted diseases.

True

False

Not sure

Don’t know

17 / 25

The maleness of a child is determined by:

The X chromosome in the zygote

The Y chromosome in the zygote

The cytoplasm of the germ cell which determines the sex

Sex is determined by chance

18 / 25

Select the group which shares the maximum number of common characters

Two species of a genus

Two genera of a family

Two individuals of a species

Two genera of two families

19 / 25

Which of the following statements is correct regarding the propagation of light of diferent colours of white light in air?

Red light moves the fastest.

Blue light moves faster than green light

All the colours of the white light travel with the same speed. (d)

Yellow light moves with the mean speed as that of red and the violet light.

20 / 25

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

is scattered the most by smoke or fog

is scattered the least by smoke or fog

is absorbed the most by smoke or fog

moves the fastest in air

21 / 25

The defect in a person can see nearby objects but not far away objects

Far-sightedness

Myopia

Astigmatism

none

22 / 25

Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is

current

voltage

resistance

None of these

23 / 25

Insulators consists of:

No resistance

High resistance

Small resistance

Variable resistance

24 / 25

The commercial motors use a soft iron core on which the coil is wound because

to increase the power of the electric motor

to decrease the power of the electric motor

to reduce the power of the electric motor.

none

25 / 25

Which of the following is not attracted by a magnet:

Steel

cobalt

nickel

brass

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

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