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

Identify the reducing agent in the following reactions 4NH₃ + 5O₂ → 4NO + 6H₂O

O₂

NH₃

NO

H₂O

2 / 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

3 / 25

Common salt other than being used in kitchen can also be used as the raw material for making:

Washing soda

Bleaching powder

Baking soda

Slaked lime

1 and 3

1 and 2

1, 2 and 3

1, 3 and 4

4 / 25

The source of lactic acid is

curd

milk

butter

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 organic compounds having functional group are known as:

Aldehyde

Ketone

Carboxylic acids

Alcohol

8 / 25

Which of the following substance produces brisk effervescence with baking soda solution?

Ethanoic acid

Table salt

Vinegar

Sunflower oil

9 / 25

Which of the following is the molecular formula of cyclobutane?

C4H10

C4H6

C4H8

C4H4

10 / 25

Which among the following elements has the largest atomic radii?

Na

Mg

K

Ca

11 / 25

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

F < C < O < Be < Li

F < O < C < Be < Li

Li < Be < C < O < F

Li < Be < C < F < O

12 / 25

If salivary amylase is lacking in the saliva, which of the subsequent events in the mouth cavity will be affected?

Proteins breaking down into amino acids

Starch breaking down into sugars

Cats breaking down into fatty acids and glycerol.

Absorption of vitamins

13 / 25

Select the event that does not materialise in photosynthesis.

Absorption of light energy by chlorophyll

Reduction of carbon dioxide to carbohydrates

Oxidation of carbon to carbon dioxide

Conversion of light energy to chemical energy

14 / 25

Characters that are transmitted from parents to ofspring during reproduction

Only similarities with parents

Only variations with parents

Both similarities and variations with parents

Neither similarities nor variations

15 / 25

Which of the following is a Bacterial STD?

Warts

Syphilis

Hiv-Aids

All Of These

16 / 25

Blocking of fallopian tubes prevents ?

Pregnancy

Sexually transmitted diseases

Genetic uniformity

None Of These

17 / 25

What is the phenotypic ratio obtained in Mendels dihybrid cross

9:3:3:1

9:3:2:1

9:3:1:1

9:9:3:1

18 / 25

Which of the following statement is inappropriate?

For every hormone there is a gene.

For every protein there is a gene.

For production of every enzyme there is a gene.

For every molecule of fat there is a gene.

19 / 25

Power of a lens is the measure of the degree of

divergence of light ray

convergence of light ray

convergence or divergence of light ray.

none

20 / 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

21 / 25

Visible spectrum is the band of coloured components of a

red light beam

white light beam

blue light beam

black light beam

22 / 25

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly

10 to the power of 20

10 to the power of 16

10 to the power of 18

10 to the power of 23

23 / 25

True test of charge is

Attraction only

Repulsion only

Both attraction and repulsion

None of the above

24 / 25

A coil of many circular turns of wire wrapped in the shape of a cylinder

Bar magnet

solenoid

horse shoe magnet

none

25 / 25

The law states that if the forefinger indicates the direction of the magnetic field and thumb shows the direction of motion of conductor, then the middle finger will show the direction of induced current

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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