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, the colour of the solution fades and a black precipitate is obtained.Why does the colour of the solution fades?

due to its reaction with hydrogen sulphide gas and results into the formation of colourless solution of sulphuric acid.

due to its reaction with Copper sulphate gas and results into the formation of colourless solution of sulphuric acid.

Both 1 & 2

all of these

2 / 25

Mention whether it is physical or chemical changes : Heating of an iron rod to red hot

physical

chemical

Both 1 & 2

none of these

3 / 25

Which of the following declaration is true for acids?

Bitter and change red litmus to blue

Sour and change red litmus to blue.

Sour and change blue litmus to red

Bitter and change blue litmus to red.

4 / 25

Which of the following statements is correct about an aqueous solution of an acid and a base?

The higher the pH, the stronger the acid

The higher the pH, the weaker the acid

The lower the pH, the stronger the base

The lower the pH, the weaker the base

2 and 4

1 and 3

2 and 3

1 and 4

5 / 25

The composition of aqua-regia is:

Dil. HCI : Conc. HNO₃ 3 : 1

Conc. HCI: Dil. HNO₃ 3 : 1

Conc. HCl: Conc. HNO₃ 3 : 1

Dil. HCl : Dil. HNO₃ 3 : 1

6 / 25

Name a metal that have very low melting points.

Gallium

Tungsten

platinium

Diamond

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

Buckminsterfullerene is an allotropic form of:

Phosphorus

Sulphur

Carbon

Tin

9 / 25

A saturated hydrocarbon undergoes complete combustion and burns with

blue flame

red flame

orange flame

white flame

10 / 25

An element X with atomic number 12 forms a compound with element Y with atomic number 17. The formula of the compound formed is:

XY

XY₂

X₂Y

X₂Y₃

11 / 25

Which of the following is the outermost shell for elements of period 2

K shell

L shell

M shell

N shell

12 / 25

Which of the following statements about the autotrophs is inapropriate:

They synthesize carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

They store carbohydrates in the form of starch

They convert carbon dioxide and water into carbohydrates in the absence of sunlight

They constitute the frst trophic level in food chains

13 / 25

The organ of the circulatory system in humans.

Veins

Nose

Lungs

Kidney

14 / 25

Factors responsible for the rapid spread of bread mould on slices of bread are:

Large number of spores

Availability of moisture and nutrients in the bread

Presence of tubular branched hyphae

Formation of round shaped sporangia

1

2

1 And 2

1 and 3

15 / 25

Which of the following is a Bacterial STD?

Warts

Syphilis

Hiv-Aids

All Of These

16 / 25

Which pollination increases genetic uniformity and decreases variations

Cross Pollination

Self Pollination

Both 1 & 2

None Of These

17 / 25

A cross between a tall plant (TT) and short plant (tt) resulted in progeny that were all tall plants as:

Tallness is the dominant trait

Shortness is the dominant trait

Tallness is the recessive trait

Height of plant is not governed by gene t or t

18 / 25

Which of the subsiquent is not a direct conclusion that can be drawn from Mendels experiment?

Only one parental trait is expressed.

Two copies of each trait are inherited in sexually reproducing organism

For recessive trait to be expressed, both copies should be identical

Natural selection can alter frequency of an inherited trait.

19 / 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

20 / 25

The SI unit of Power of a lens is

Hertz

Dipotre

newton

none

21 / 25

The refractive index of glass is least for

violet color

red color

blue color

white color

22 / 25

To get 2 Ω resistance using only 6 Ω resistors, the number of them required is

2

3

4

6

23 / 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

24 / 25

Direction of rotation of a coil in electric motor is intent by:

fleming’s right hand rule

fleming’s left hand rule

faraday law of electromagnetic inductors

None of these

25 / 25

In electric motor, to make the coil rotating constantly in the identical direction, current is reversed in the coil after every half rotation by a device called:

carbon brush

commutator

slip ring

armature

Your score is

0%

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

Archives

Categories