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

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.Name the type of reaction taking place.

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

Which of the following gives the exact increasing order of acid strength?

The chemical formula for plaster of Paris is :

The metals that float when dealt with water are:

Name a metal which is highly malleable

From which of the following substance pencil lead is formed?

The compounds have low melting and boiling points.

The molecular formula of the fourth member of alkane series.

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following classification does the element belong?

Arrange these elements in decreasing order of their atomic radii

In which part of the alimentary canal food is ultimately digested?

The opening and closing of the stomatal pore depends upon:

Fertilisation is the process of

Slides of binary fission in Amoeba and budding in yeast were given for observa group of students. Some of the observations reported by the group are given below:

1. Cytokinesis was observed in the yeast cell.
2. A chain of buds were observed in Amoeba.
3. Single cell of Amoeba and single cell of yeast were undergoing binary fission and budding respectively
4. Elongated nucleus was dividing to form two daughter nuclei in Amoeba

Blocking of fallopian tubes prevents ?

What is the phenotypic ratio obtained in Mendels dihybrid cross

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that:

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

Power of a lens is

Visible spectrum is the band of coloured components of a

A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is:

The commercial unit of electrical energy

The instrument that use to direct electric current in the circuit is known as:

The commercial motors use a soft iron core on which the coil is wound because