CBSE Class 10th...

The compound which is a major component of bio-gas and CNG is :

When excess \(CO_2\) is passed through lime water, the milkiness disappears. This is due to the formation of : 

Assertion(A): Changes in packaging have resulted in much of our waste becoming nonbiodegradable.

Reasons(R): Changes in attitude also have a role to play, with more and more things we use becoming disposable.

Assertion(A): Some organisms can make organic compounds like sugar and starch from inorganic substances using the radiant energy of the sun in the presence of chlorophyll

Reasons(R): These organisms are called producers which include all green plants and certain bacteria which can produce food by photosynthesis.

Assertion(A): A cell divides to give rise to two cells.

Reasons: This is a basic event in reproduction in which cells use chemical reactions to build copies of their DNA.

The gas produced when dilute hydrochloric acid is added to a reactive metal is :

The taste or smell of fat change when kept for a long time due to

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Some variants survived due to

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Variation occurs due to:

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Variations leads to:

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Variation and evolution are interrelated

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Variation is prominent in:

The process of peristaltic movements in digestive tube is controlled by

The part of Phloem which is responsible for translocation of food in plants is

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Formula of rusting is

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Rusting of iron is same as ...........in other material.

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Due to corrosion, silver becomes

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Due to corrosion, copper becomes

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Corrosion causes damage to:

The respiratory pigment in human beings is

Which mirror is used as a shaving mirror ?

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

Magnification is given by:

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

The height of object is taken as positive because:

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

If magnification is negative, then image is

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

 ‘v’ is negative when image is:

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

‘f’ is negative for

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

If u = 25 cm, f = 15 cm, mirror is concave, then ν =?

How much energy is given to each coulomb of charge passing through a 6V battery ?

An electric iron of resistance \(20\Omega\) takes a current of 5A .Calculate the heat developed in 30 s.

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Biotic components of ecosystems are:

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Abiotic components are:

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Examples of natural ecosystems are:

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Examples of artificial ecosystems are:

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Several ecosystems combine to form:

The change in colour we observe when a drop of methyl orange is added to \(Mg(OH)_2\)