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

The following reaction is used for the preparation of oxygen gas in the laboratory: 2KClO₃(s) Heat ⎯ → Catalyst ⎯⎯⎯ 2KCl(s) + 3O₂(g) Which of the following statement(s) is/are correct about the reaction?

It is a decomposition reaction and endothermic in nature

It is a combination reaction

It is a decomposition reaction and accompanied by release of heat

It is a photochemical decomposition reaction and exothermic in nature

2 / 25

Which of the subsequent does show an oxidation reaction

Gain of oxygen

Loss of oxygen

Gain of hydrogen

None of the above

3 / 25

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

Wash the hand with a saline solution

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

After washing with plenty of water, apply a solution of sodium hydroxide on the hand

Neutralise the acid with a strong alkali

4 / 25

The source of citric acid is

lemon

vinegar

orange

none

5 / 25

Which one of the following properties is not commonly exhibited by ionic compounds?

Solubility in water

Electrical conductivity in solid state

High melting and boiling points

Electrical conductivity in molten state

6 / 25

Name one non-metal that exist in liquid state at room temperature.

bromine

mercury

Ballium

gold

7 / 25

A molecule of ammonia (NH₃) has:

Only single bonds

Only double bonds

Only triple bonds

Two double bonds and one single bond

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

Which of the following elements would lose an electron with ease?

Mg

Na

K

Ca

11 / 25

Is calcium?

metal

non metal

both

none of these

12 / 25

The opening and closing of the stomatal pore depends upon:

Oxygen

Temperature

Water in guard cells

Concentration of CO2 in stomata

13 / 25

The organ of the circulatory system in humans.

Veins

Nose

Lungs

Kidney

14 / 25

Which of the following is a bacterial STD?

Gonorrhoea

Warts

HIV

None Of These

15 / 25

What do you understand by Puberty?

The age at which the reproductive organs of boys and girls become non functional.

The age at which the reproductive organs of boys and girls become functional.

It is a process of fertilisation in boys and girls.

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 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

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

Arpit 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 ,What is the total time diference on duration of day on earth?

4 minutes

6minutes

8minutes

10minutes

20 / 25

When a fine beam of sunlight enters a smoke filled room, smoke particles become visible due to scattering of light by these particles

Tyndall effect

Dispersion of light

Scattering of light

Reflection of light

21 / 25

The sky appears black to an astronaut as there is no

refraction of light

scattering of light

reflection of light

Dispersion of light

22 / 25

The condition for the credibility of Ohm’s law is that the

Temperature should remain constant

Current should be proportional to voltage

Resistance must be wire wound type

All of the above

23 / 25

At the time of short circuit, the electric current in the circuit

vary continuously

does not change

reduces substantially

increases heavily

24 / 25

A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference:

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

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