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

Why are oil and fat containing food items fushed with nitrogen while packing?

to prevent reduction

To prevent rancid

to increase oxidation

none of these

2 / 25

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Designate the accurate observation:

The surface of metal becomes shiny.

The reaction mixture turns milky.

Odour of a pungent smelling gas is recorded.

A colourless and odourless gas is evolved

3 / 25

Which of the following is not a mineral acid?

Hydrochloric acid

Citric acid

Sulphuric acid

Nitric acid

4 / 25

Hydrogen is used in manufacture

of ammonia for fertilizers and as Rocket fuel.

soaps

dyes

none

5 / 25

The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

X is a metal

Y is a non-metal and Z is a metal

6 / 25

which metal is more reactive?

calcium

sodium

both 1 & 2

none of these

7 / 25

Cation is formed when:

Atom gains electrons

Atom loses electrons

Proton is lost by the atom

Atom shares electrons

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 among the following elements has the largest atomic radii?

Na

Mg

K

Ca

11 / 25

Three elements B, Si and Ge are:

Metals

Non-metals

Metalloids

Metal, non-metal and metalloid

12 / 25

Single circulation, i.e., blood fows through the heart only once during one cycle of passage through the body, is manifested by:

Labeo, Chameleon, Salamander

Hippocampus, Exocoetus, Anabas

Hyla, Rana, Draco

Whale, dolphin, turtle

13 / 25

Which of the following is an important component of haemoglobin

calcium

potassium

Sodium

Iron

14 / 25

Choose the precise statement(s) on budding in yeast from the following:

A parent cell divides into two or more daughter cells and here the parent identity is lost

In this the elongated nucleus divides to form two or more daughter nuclei.

A bud arises from a particular region on a parent body

After detaching from the parent body the bud grows into a new independent individual

15 / 25

Characters transmitted from parents to ofspring are present in:

Cytoplasm

RIbosome

Golgi complex

Genes

16 / 25

The number of chromosomes in parents and ofsprings of a particular species remains unchanged due to

Doubling of chromosomes during gamate formation.

Halving of chromosomes during gamate formation

Halving of chromosomes during zygote formation

Doubling of chromosomes during gamate formation

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

A trait in an organism is infuenced by:

Paternal DNA only

Maternal DNA only

Both maternal and paternal DNA

Neither paternal nor maternal DNA

19 / 25

The sky appears black to an astronaut

Because there is no refraction

Because there is no reflection

Because there is no scattering light

none

20 / 25

The SI unit of Power of a lens is

Hertz

Dipotre

newton

none

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

The commercial unit of electrical energy

kilo hour

watt hour

kilowatt hour

none

23 / 25

The device used for detecting and indicating an electric current.

Ammeter

voltmeter

galvanometer

potentiometer

24 / 25

The magnetic feld inside a long straight solenoid carrying current is:

uneven

zero

same at all points

None of these

25 / 25

A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid:

will decrease

will remains same

will increase

will become zero

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

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