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901.

Heat chapter is not showing. But my question is related to states of matter. Why are ice cubes kept in thermocol boxes?

Answer»

Heat chapter is not showing. But my question is related to states of matter. Why are ice cubes kept in thermocol boxes?

902.

a large block of ice 10cm thick with a vertical hole drilled through it is floating in a lake.the minimum length of the rope required to scoop out a bucket full of water through the hole is(density of ice=0.9g/cm^3)

Answer» a large block of ice 10cm thick with a vertical hole drilled through it is floating in a lake.the minimum length of the rope required to scoop out a bucket full of water through the hole is(density of ice=0.9g/cm^3)
903.

Which of these is a physical and irreversible change?(a) burning of a paper(b) evaporation of water(c) breaking of a glass tumbler(d) lighting of an electric bulb

Answer» Which of these is a physical and irreversible change?

(a) burning of a paper

(b) evaporation of water

(c) breaking of a glass tumbler

(d) lighting of an electric bulb
904.

What is the structure of isopropyl

Answer» What is the structure of isopropyl
905.

Identify the processes A, B and C with respect to the following figure:

Answer»

Identify the processes A, B and C with respect to the following figure:


906.

Question 23Match the items of Column A with the items of Column B.

Answer» Question 23

Match the items of Column A with the items of Column B.


907.

What is the Dimensional formula for moment of couple?

Answer» What is the Dimensional formula for moment of couple?
908.

Question 2 (d) State whether the following statement is true or false: The process of removing seed from cotton is called ginning.

Answer»

Question 2 (d)

State whether the following statement is true or false:
The process of removing seed from cotton is called ginning.

909.

How does internal erg change in case of ideal, positive and negative solutions?

Answer» How does internal erg change in case of ideal, positive and negative solutions?
910.

Explain electrical conductivity of metals. [3 MARKS]

Answer»

Explain electrical conductivity of metals. [3 MARKS]

911.

How to read a clinical thermometer?

Answer»

How to read a clinical thermometer?

912.

What happens to the snow on mountain? How is it a part of water cycle. THANK YOU FOR ANSWERING

Answer»

What happens to the snow on mountain? How is it a part of water cycle.

THANK YOU FOR ANSWERING

913.

List three properties of mixtures.

Answer» List three properties of mixtures.
914.

What is petroleum refining?

Answer» What is petroleum refining?
915.

What is Compton effect?

Answer» What is Compton effect?
916.

Give one example for each of the following types of changes:(a) physical changes.(b) chemical changes(c) reversible changes(d) irreversible changes

Answer» Give one example for each of the following types of changes:

(a) physical changes.

(b) chemical changes

(c) reversible changes

(d) irreversible changes
917.

Jyothi plans to measure the temperature of hot water with a clinical thermometer. Is it right or wrong? Why?

Answer» Jyothi plans to measure the temperature of hot water with a clinical thermometer. Is it right or wrong? Why?
918.

A mixture of ammonium chloride and salt is separated by the process of ______________. The volatile component in this case is ______________.

Answer»

A mixture of ammonium chloride and salt is separated by the process of ______________. The volatile component in this case is ______________.


919.

If 2x + 3y = 5 and 3x + 2y = 10, then x – y = ____________ .

Answer» If 2x + 3y = 5 and 3x + 2y = 10, then x – y = ____________ .
920.

what is salt bridge?

Answer» what is salt bridge?
921.

What fraction of the surface of a crystal of Cd at T=298K consists of vacancies?Enthalpy of sublimation (Cd)=113.02 kJ mol-1. Energy needed to form a vacancy is approximately 60% of enthalpy of sublimation

Answer» What fraction of the surface of a crystal of Cd at T=298K consists of vacancies?Enthalpy of sublimation (Cd)=113.02 kJ mol-1. Energy needed to form a vacancy is approximately 60% of enthalpy of sublimation
922.

What are the significant figures in 2.60?

Answer» What are the significant figures in 2.60?
923.

Question 1Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?(a) Minerals(b) Water(c) Soil(d) Plastic

Answer» Question 1

Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?



(a) Minerals

(b) Water

(c) Soil

(d) Plastic


924.

Fibre is a -

Answer»

Fibre is a -



925.

Ma'am , when I was watching a video about transparent, opaque and translucent , they were telling when we are taking tissue paper it is opaque but when we put water above, it becomes translucent..when I was taking test for this chapter , I got a question and I typed transparent. But it was correct answer, and was showing solution transparency .. so my doubt is what is the difference between transparent and transparency ?

Answer» Ma'am , when I was watching a video about transparent, opaque and translucent , they were telling when we are taking tissue paper it is opaque but when we put water above, it becomes translucent..when I was taking test for this chapter , I got a question and I typed transparent. But it was correct answer, and was showing solution transparency .. so my doubt is what is the difference between transparent and transparency ?
926.

why the min value of |x-a| + |x-b| =a-b

Answer» why the min value of |x-a| + |x-b| =a-b
927.

lwater cycle

Answer» lwater cycle
928.

Why we are unable to move on ice?

Answer» Why we are unable to move on ice?
929.

A glass filled with ice cubes was placed on a table. After a while, water droplets appeared on the glass surface. Which of these sentences is/ are TRUE? i) This phenomenon is known as condensation. ii) This proves that water vapour is present in the air. iii) This is also observed when a hot object vapour in the open.

Answer»

A glass filled with ice cubes was placed on a table. After a while, water droplets appeared on the glass surface.

Which of these sentences is/ are TRUE?
i) This phenomenon is known as condensation.
ii) This proves that water vapour is present in the air.
iii) This is also observed when a hot object vapour in the open.


930.

The figure shows what type of change?

Answer»

The figure shows what type of change?




931.

An electric bulb converts electrical energy into ___ energy.

Answer»

An electric bulb converts electrical energy into ___ energy.


932.

Sieving is not used when components of a mixture have:

Answer»

Sieving is not used when components of a mixture have:


933.

Question 5What are the types of natural fibres? Explain each with suitable examples.

Answer»


Question 5



What are the types of natural fibres? Explain each with suitable examples.



934.

29 Why in SiO2 Ppi-Ppi bonding is absent.

Answer» 29 Why in SiO2 Ppi-Ppi bonding is absent.
935.

Why at azeotropic composition liquids and vapour have same composition

Answer» Why at azeotropic composition liquids and vapour have same composition
936.

What happens when light falls on transparent object like glass

Answer» What happens when light falls on transparent object like glass
937.

What is ppm?

Answer» What is ppm?
938.

Question 22 (ii)Fill in the blanks(ii) The synthetic fibres are also known as ___ fibres.

Answer» Question 22 (ii)

Fill in the blanks



(ii) The synthetic fibres are also known as ___ fibres.
939.

What keeps the wool-yielding animals warm?

Answer»


What keeps the wool-yielding animals warm?



940.

Question 27It is said, “CO2 contributes to global warming.” Explain.

Answer»

Question 27

It is said, “CO2 contributes to global warming.” Explain.



941.

The process of changing water vapour into water is called

Answer» The process of changing water vapour into water is called
942.

Which of the following gases cause the harmful greenhouse effect?

Answer»

Which of the following gases cause the harmful greenhouse effect?



943.

Which of the following is used during filtration for removing insoluble impurities from a liquid mixture?

Answer»

Which of the following is used during filtration for removing insoluble impurities from a liquid mixture?


944.

By which phenomenon, water droplets are obtained under a plate that has been used to cover a vessel containing milk that has just been boiled?

Answer»

By which phenomenon, water droplets are obtained under a plate that has been used to cover a vessel containing milk that has just been boiled?


945.

What does pi indicate in mediating particle of strong force

Answer» What does pi indicate in mediating particle of strong force
946.

21. Two elements P and Q combine to form a compound. If P has 2 electrons and Q has 6 electrons in their outermost shell, what will be formula of the compound formed? (1)PQ (2)P2Q (3)P2Q3 (4)PQ2

Answer» 21. Two elements P and Q combine to form a compound. If P has 2 electrons and Q has 6 electrons in their outermost shell, what will be formula of the compound formed? (1)PQ (2)P2Q (3)P2Q3 (4)PQ2
947.

What is n-factor & how to find it?

Answer» What is n-factor & how to find it?
948.

styrene with NB

Answer» styrene with NB
949.

Why is the burning of a candle considered to be an irreversible change, even though we get back the wax after cooling it?

Answer» Why is the burning of a candle considered to be an irreversible change, even though we get back the wax after cooling it?
950.

What is NAM and NAG?

Answer» What is NAM and NAG?