NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Expert Answers
ALL
Ayushmaan Rocks
Subject: Science
, asked on 27/2/18
Q. Write the disadvantages of hydropower plants?
Answer
3
Sumit Kumar Jha
Subject: Science
, asked on 17/2/18
Q. Two students A and B got the mixture of iron filings and sulphur. 'A' heated the mixture strongly but 'B' kept it as such. They divided the mixture into three parts and did the same tests. Tabulate the observation when
a) Both added HCI to a part of their mixture
b) Both added carbon disulphide to another mixture.
c) Both used magnet to separate the constituents of the mixture.
Q. A pump lifts 420 kg of water every minute through a vertical height of 30 m, assume that g = 10 m/
s
2
a) Calculate the potential energy gained by the water every minute.
b) Explain why the energy needed to operate the pump for one minute is greater than the value you calculated in (a)
c) Calculate the useful power output of the pump.
Answer
2
Eshita Rastogi
Subject: Science
, asked on 14/2/18
how sedimentation in dams causes flooding?
Answer
1
Atreya
Subject: Science
, asked on 12/2/18
Q). Can u tell wether work.is done.or not.done in the 3 following cases.
1.
2.
3.
Answer
4
Champ Jee
Subject: Science
, asked on 11/2/18
What is a solar cell? Why and how is a solar cell application and panel prepared? List two limitations of these panels.
Answer
3
Champ Jee
Subject: Science
, asked on 9/2/18
List any three parameters, which categorizes any source of energy as a good source of energy.
Answer
4
Champ Jee
Subject: Science
, asked on 9/2/18
Write two limitations of solar cells.
Answer
3
Champ Jee
Subject: Science
, asked on 4/2/18
Why in greenhouse effect, the sunrays are able to enter the atmosphere but arent able to get out? I mean the gases are still present when rays enter. Why?
Answer
1
Medha Bhattacharya
Subject: Science
, asked on 2/2/18
Q. Give two examples Of non-conventional sources of energy which don't cause any pollution. Mention two limitations with regard to their use.
Answer
2
Shreya Watwe
Subject: Science
, asked on 2/2/18
How is it that the sun has been radiating continuously for millions of years
Answer
2
Champ Jee
Subject: Science
, asked on 29/1/18
Biomass has been used as fuel since ancient times, how has it been modified to function as a more efficient fuel in recent past?
Answer
1
Champ Jee
Subject: Science
, asked on 29/1/18
Q25.
Answer
3
Champ Jee
Subject: Science
, asked on 29/1/18
Is wave energy also an indirect form of solar enegy?
Answer
1
Champ Jee
Subject: Science
, asked on 29/1/18
What % of solar energy can be converted by a modern solar energy?
Answer
1
Champ Jee
Subject: Science
, asked on 29/1/18
Which part of sunlight is used in heating of solar cooker?
Answer
1
Prev
2
3
4
5
6
Next
What are you looking for?
a) Both added HCI to a part of their mixture
b) Both added carbon disulphide to another mixture.
c) Both used magnet to separate the constituents of the mixture.
Q. A pump lifts 420 kg of water every minute through a vertical height of 30 m, assume that g = 10 m/
a) Calculate the potential energy gained by the water every minute.
b) Explain why the energy needed to operate the pump for one minute is greater than the value you calculated in (a)
c) Calculate the useful power output of the pump.
1.
2.
3.
Q. Give two examples Of non-conventional sources of energy which don't cause any pollution. Mention two limitations with regard to their use.