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5251.

"In Rutherford's modle if the atom the electrons revolve around the nucleus and the attractive force of the positively charged nucleus would be balanced by the centrifugal force arising due to the rotation of electrons" Please explain me the meaning

Answer»

"In Rutherford's modle if the atom the electrons revolve around the nucleus and the attractive force of the positively charged nucleus would be balanced by the centrifugal force arising due to the rotation of electrons"

Please explain me the meaning

5252.

An atom has an atomic number of 19 and a mass number of 39. How many electron ,protons and neutrons does it have?

Answer»

An atom has an atomic number of 19 and a mass number of 39. How many electron ,protons and neutrons does it have?

5253.

A region of a lake is turned into a dead zone. Identify the correct reason.

Answer»

A region of a lake is turned into a dead zone. Identify the correct reason.


5254.

Choose the non-metallic oxides from the following:

Answer»

Choose the non-metallic oxides from the following:


5255.

Any synthetic fibre can be combined with two or more other fibres. This process is called ___.

Answer» Any synthetic fibre can be combined with two or more other fibres. This process is called ___.
5256.

Which of the following is/are example(s) of corrosion?

Answer»

Which of the following is/are example(s) of corrosion?


5257.

You are a member of the municipal body of your town. Make a list of 5 measures that would help your town to ensure the supply of clean water to all its residents. [5 MARKS]​

Answer» You are a member of the municipal body of your town.
Make a list of 5 measures that would help your town to ensure the supply of clean water to all its residents. [5 MARKS]​
5258.

Substances taking part in a chemical reaction are called ______.

Answer»

Substances taking part in a chemical reaction are called ______.


5259.

The proportion of oxygen and carbon dioxide in the atmosphere is maintained by _______.

Answer»

The proportion of oxygen and carbon dioxide in the atmosphere is maintained by _______.


5260.

When we add some salt in water it looks transparent and as we keep on adding salt the solution get another why did this happens

Answer»

When we add some salt in water it looks transparent and as we keep on adding salt the solution get another why did this happens

5261.

what is a spontaneous combustion?

Answer» what is a spontaneous combustion?
5262.

The clothes of a person working in the kitchen catch fire accicently causing severe burns. The person is most likely wearing clothes made of : (a) flax (b) rayon (c) terylene (d) cotton

Answer»

The clothes of a person working in the kitchen catch fire accicently causing severe burns. The person is most likely wearing clothes made of :

(a) flax (b) rayon (c) terylene (d) cotton

5263.

Explain isotropicity and differentiate between anisotropic and isotropic compounds?

Answer» Explain isotropicity and differentiate between anisotropic and isotropic compounds?
5264.

Why do Gallium and Caesium melt whem kept on palm of your hand?

Answer»

Why do Gallium and Caesium melt whem kept on palm of your hand?

5265.

The S.I unit of work is :

Answer»

The S.I unit of work is :


5266.

The most abundantly found element in the earth's atmosphere is:-

Answer»

The most abundantly found element in the earth's atmosphere is:-


5267.

Which gas is known is also known as black gold

Answer» Which gas is known is also known as black gold
5268.

Which among the following is a clean fuel?

Answer»

Which among the following is a clean fuel?


5269.

Will metals conduct electricity when in liquid form? If yes, will they break up in the process?

Answer» Will metals conduct electricity when in liquid form? If yes, will they break up in the process?
5270.

There is a colour change observed in silver bromide when exposed to sunlight. This is due to

Answer»

There is a colour change observed in silver bromide when exposed to sunlight. This is due to

5271.

An arrow is released vertically upwards attains the maximum height of 5m from the level it is released. If the mass of the arrow is 500 grams, work done by the bow on arrow is greater than which of the following? (Assume, g = 10 m/s2)

Answer»

An arrow is released vertically upwards attains the maximum height of 5m from the level it is released. If the mass of the arrow is 500 grams, work done by the bow on arrow is greater than which of the following? (Assume, g = 10 m/s2)


5272.

Write the advantages of using LPG as fuel

Answer»

Write the advantages of using LPG as fuel

5273.

a person travelling for hyd to delhi in an aeroplane suddenly due to certain situation the window pane is broken . what problem would they face

Answer»

a person travelling for hyd to delhi in an aeroplane suddenly due to certain situation the window pane is broken . what problem would they face

5274.

Difference between : (a) Pure and impure substances (b) Homogeneous and heterogeneous substances

Answer»

Difference between :

(a) Pure and impure substances

(b) Homogeneous and heterogeneous substances

5275.

What is atomic mass? How is amu expressed? [2 MARKS]

Answer»

What is atomic mass? How is amu expressed? [2 MARKS]

5276.

Which is the most reactive metal and the least reactive metal?

Answer»

Which is the most reactive metal and the least reactive metal?

5277.

The suspended particles released by combustion of coal in air may lead to a health disease.

Answer»

The suspended particles released by combustion of coal in air may lead to a health disease.


5278.

Name two non-metals which are used in fireworks (crackers,etc.).

Answer»

Name two non-metals which are used in fireworks (crackers,etc.).

5279.

Water that is fit for drinking is appropriately called ___

Answer»

Water that is fit for drinking is appropriately called ___


5280.

Caesium is a metal with very low melting points. But , we still call it metal as it satisfies the other properties of a metal. The metals Sodium and Potassium does not satisfy many properties of being a metal. But still they are metals..... Why!!!!!!

Answer»

Caesium is a metal with very low melting points. But , we still call it metal as it satisfies the other properties of a metal. The metals Sodium and Potassium does not satisfy many properties of being a metal. But still they are metals..... Why!!!!!!

5281.

Statement 1: Coal petroleum, natural gas all comprises of fossil fuels. Statement 2: They are called fossils as they are made from the dead remains of organic matter.

Answer»

Statement 1: Coal petroleum, natural gas all comprises of fossil fuels.
Statement 2: They are called fossils as they are made from the dead remains of organic matter.


5282.

What are isotope and isobars

Answer» What are isotope and isobars
5283.

The zone that produces light in a candle flame is called

Answer»

The zone that produces light in a candle flame is called

5284.

Which adjective in the given phrase indicates material? The fine sharp silvery metal scraps

Answer»

Which adjective in the given phrase indicates material?

The fine sharp silvery metal scraps


5285.

what is diffusion

Answer»

what is diffusion

5286.

Out of the three substances present in the fire triangle, which is the toughest to be removed in case of fire?

Answer»

Out of the three substances present in the fire triangle, which is the toughest to be removed in case of fire?

5287.

The vapour pressure of water at 300 K in a closed container is 0.4 atm. If the volume of container is doubled, its vapour pressure at 300 K will be:

Answer»

The vapour pressure of water at 300 K in a closed container is 0.4 atm. If the volume of container is doubled, its vapour pressure at 300 K will be:


5288.

What are the uses of sonority property of metals

Answer» What are the uses of sonority property of metals
5289.

What is produced when steam is passed over red hot coke?

Answer»

What is produced when steam is passed over red hot coke?


5290.

What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?

Answer»

What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?


5291.

The element Z burns in air to form an oxide.The aqueous solution of this oxide turns blue litmus to red. (a) carbon (b) calcium (c) iron (d) magnesium

Answer»

The element Z burns in air to form an oxide.The aqueous solution of this oxide turns blue litmus to red.

(a) carbon

(b) calcium

(c) iron

(d) magnesium

5292.

__(Inexhaustible/ Exhaustible) are limited in quantity, and are likely to be finished forever or exhausted.

Answer» __(Inexhaustible/ Exhaustible) are limited in quantity, and are likely to be finished forever or exhausted.
5293.

What is a physical reaction?

Answer» What is a physical reaction?
5294.

Different stages of coal?

Answer»

Different stages of coal?

5295.

Can a body undergo physical as well as chemical change simulteneosely ? Support your answer with an appropriate example ?

Answer» Can a body undergo physical as well as chemical change simulteneosely ? Support your answer with an appropriate example ?
5296.

Is sulphate a metal?

Answer»

Is sulphate a metal?

5297.

Complete the reaction Zn+O2Δ−→ ________

Answer» Complete the reaction Zn+O2Δ ________
5298.

Elements are mostly grouped into metals,non-metals and___ .

Answer»

Elements are mostly grouped into metals,non-metals and___ .

5299.

Which of the following is suggested to plant near sewage ponds?

Answer»

Which of the following is suggested to plant near sewage ponds?


5300.

Why do we store potassium in kerosene ?

Answer» Why do we store potassium in kerosene ?