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?

Which of the subsequent is (are) an endothermic process(es)?

1. Dilution of sulphuric acid
2. Sublimation of dry ice
3. Condensation of water vapours
4. Evaporation of water

identical volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?

Hydrogen is used in manufacture

The Lustrous non-metal

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: Al and Cl₂

The electronic configuration of an element is found to be 2, 4. How many bonds can one carbon atom form in a compound?

Ethane is

The name of the fourth member of alkane series.

Which of the following gives the accurate increasing order of the atomic radii of O, F and N?

The electronic confgurations of three elements X, Y and Z are: X : 2 Y : 2, 8, 7 Z : 2, 8, 2 Which of the following is true regarding these elements?

When air is blown from mouth into a test tube suppress lime water, the lime water turns milky due to the presence of:

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

Assertion (A): Variation is useful for the survival of species over time. Reason (R) : Populations of organisms fill well-defined places in the ecosystem, using their ability to reproduce

What is the mode of asexual reproduction in Rhizopus

The development foetus takes place in mother’s body from

Which one is a Feasible progeny in F2 generation of pure bred tall plant with round seed and dwarf plant with wrinkled seeds?

In human males, all the chromosomes are match up perfectly except one. These unpaired chromosomes are:

1. Large chromosome
2. Small chromosome
3. Y chromosome
4. X chromosome

Milk is a colloid that contains globules of fat and protein. When a beam of light is directed at a glass of milk the light is scattered. That is a great example

The effect seen Color of the sky during Sunrise and Sunset

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

The instrument used for measuring electric current is:

The unit of electric power may also be expressed as

For a current in a long straight solenoid N and S-poles are created at the two ends. Among the subsequent declaration , the incorrect declaration is:

To determine the direction of force experienced by a current carrying conductor placed in a uniform magnetic feld.