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

Which reaction takes place when layer of silver deposit on copper wire when dipped in silver nitrate solution?

Mention whether it is a physical or chemical changes: -Evaporation of petrol

The chemical used in manufacture of soaps

Common name calcium sulphate hemihydrate

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

Name two metals having melting point less than 310 K (37°C).

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

The compounds formed by the sharing of electron pairs between two atoms.

UnSaturated hydrocarbons contains

Which of the following declaration about the modern periodic table is accurate?

Arrange these elements in decreasing order of their atomic radii

In the excretory system of human beings, some substances in the beginning fitrate such as glucose, amino acids, salts and water are selectively reabsorbed in:

The hormone whose level in the blood is responsible for the above diabetes

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

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

which of the following is a viral STD?

From the list given below, select the character which can be acquired but not inherited:

In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2  generation will be:

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

The defect the eye cannot focus objects both horizontally and vertically at the same time

Visible spectrum is the band of coloured components of a

The resistivity does not change if:

The maximum resistance which can be made using four resistors each of 2 Ohm

Which of the following declaration is not correct about the magnetic field?

when an iron core is inserted into a current carrying solenoid