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

When hydrogen sulphide gas is passed through a blue solution of copper sulphate a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remain in the solution. The reaction is an example of a:

Combination reaction

Displacement reaction

Decomposition reaction

Double displacement reaction

2 / 25

When copper turning are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because copper ?

Displaces silver from the solution

Forms a blue colored complex with AgNO₃

Is oxidized to Cu₂₊

Is reduced to Cu₂₊

3 / 25

Which of the following solutions in water does not conduct electricity?

Hydrochloric acid

Sodium chloride

Glucose

Sulphuric acid

4 / 25

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

Marble

Limestone

Baking soda

Lime

5 / 25

Why should we not throw small pieces of sodium into a sink in the laboratory? Because of

endothermic reaction

exothermic reaction

oxidation

none of these

6 / 25

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: Li and O₂

Li₂O

Lio₂

Li₃O

LiO₃

7 / 25

Carbon exists in the atmosphere in the form of:

Only carbon monoxide

Carbon monoxide in traces and carbon dioxide

Only carbon dioxide

Coal

8 / 25

From which of the following substance pencil lead is formed?

Charcoal

Wood

Lead

Graphite

9 / 25

The number of covalent bonds in the molecule of ethane.

4

7

3

1

10 / 25

Arrange these elements in increasing order of their atomic radii

Boron Lithuim Beryllium

Beryllum Lithium Boron

Lithium Beryllium Boron

Lithuim Boron Beryllium

11 / 25

The valency of an element vary across a period

increases

Decreases

Remains constant

increases/decreases

12 / 25

Which of the following is an inappropriate statement?

Organisms grow with time.

Organisms must repair and maintain their structure.

Movement of molecules does not take place among cells.

Energy is essential for life processes.

13 / 25

How many chambers are there in the heart of an amphibian?

2

3

4

6

14 / 25

The number of chromosomes in parents and offsprings of a particular species remains constant due to: Halving of chromosomes during gamete formation

Doubling of chromosomes after zygote formation

Halving of chromosomes during gamete formation

Doubling of chromosomes after gamete formation

Halving of chromosomes after gamate formation

15 / 25

In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

Filaments

Hyphae

Rhizoids

Roots

16 / 25

What is the mode of asexual reproduction in hydra?

Fragmentation

Binary Fission

Spore Formation

Regeneration Or Budding

17 / 25

A trait in an organism is infuenced by:

Paternal DNA only

Maternal DNA only

Both maternal and paternal DNA

Neither paternal nor maternal DNA

18 / 25

If a round, green-seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY), the seeds production in F1 generation are:

Round and yellow

Round and green

Wrinkled and green

Wrinkled and yellow

19 / 25

The red colour of the sun at the time of sunrise and sunset is because:

red colour is least scattered

blue colour is least scattered

red colour is most scattered

blue colour is most scattered

20 / 25

Why is red used as the stopping light at traffic signals?

Because of shorter wavelength

Because of longer wavelength

Because of no wavelength

none

21 / 25

Astigmatism can be corrected

convex lens

concave lenses

cyclindrical lens

bifocal lens

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

Magnetic effect of current was identified by:

Oersted

Faraday

Bohr

Ampere

25 / 25

To determine the direction of force experienced by a current carrying conductor placed in a uniform magnetic feld.

Fleming left hand rule

Fleming right hand rule

ohms law

none

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

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