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Ask QuestionPosted by Tripti Aggarwal 7 years, 1 month ago
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Ritesh Mahant 7 years, 1 month ago
Gaurav Seth 7 years, 1 month ago
Malaria is a mosquito-borne parasitic infection spread by Anopheles mosquitoes. The Plasmodium parasite that causes malaria is neither a virus nor a bacterium – it is a single-celled parasite that multiplies in red blood cells of humans as well as in the mosquito intestine.
Posted by Sumit Shukla 7 years, 1 month ago
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Sneha Yadav 7 years, 1 month ago
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Sukhdeep Singh 7 years, 1 month ago
Yogita Ingle 7 years, 1 month ago
Isotopes have the following uses:
(i) Treatment of diseases—Radioactive isotopes are used for the treatment of dreadful diseases like cancer. Cobalt-60 is used to kill malignant cells in patients suffering from cancer.
(ii) Radioactive isotopes are used in chemical analysis.
(iii) Diseases in plants are investigated by using radioactive isotopes.
(iv) Production of energy : Uranium-235 can be subjected to fission process and thus production of electricity.
(v) Dating of plants, animals/human beings obtained from ancient times after excavation by using carbon-14.
Posted by Karan Lal 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
- The movement of a plant part in response to light is called photoperiod
- Genetically modified crops are the crops from the plants used in agriculture, in which the DNA has been modified using genetic engineering techniques. In most cases, the aim is to introduce a new trait to the plant which does not occur naturally in the species.
Posted by Kajal Joon 7 years, 1 month ago
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Aarish Hassan 7 years, 1 month ago
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Posted by Nitesh Sharma 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
When lead nitrate is heated it forms lea oxide (solid) and nitrogen dioxide (gas) and oxygen (gas)
2Pb(NO3)2 (solid) {tex}\;\xrightarrow{heat}{/tex} 2PbO (solid) + 4NO2 (gas) + O2 (gas)
Posted by Nitesh Sharma 7 years, 1 month ago
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Posted by Nitesh Sharma 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
Lead (II) nitrate is a white ionic salt. It's soluble in water, and can be formed by reacting lead (II) oxide with nitric acid. Lead (II) nitrate is considered toxic, due to its lead content.
The formula for lead (II) nitrate is Pb(NO3)2.
Posted by Nitesh Sharma 7 years, 1 month ago
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Kajal Joon 7 years, 1 month ago
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Chiraju Goyal 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
The repeated multiple reflections of sound in any big enclosed space is known as reverberation.
The reverberation can be reduced by covering the ceiling and walls of the enclosed space with sound absorbing materials, such as fibre board, loose woollens, etc.
Posted by Shubham Dabral 7 years, 1 month ago
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Posted by Sahista Sheikh 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
When a candle burns, both physical and chemical changes occur.
Physical Changes in Burning Candle: On heating, candle wax melts and form liquid wax. It is a physical change. Since it again turns into solid wax on cooling. This is a reversible change.
Chemical Changes in Burning Candle: When you light the candle, the wax present near the wick will melt. Wick absorbs the liquid wax. The liquid wax vaporizes due the heat produced by the flame. This wax vapor near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapours, heat and light. This is an irreversible change.
Posted by Sonu Raj Bhaskar 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
G = GM / R²
g = G × (4/3 π R³ ρ) / R²
[∵ M = Volume × Density = (4/3) πR³ × ρ]
g = 4πGρR / 3
ρ = 3g / (4πGR)
Average density of Earth is 3g / (4πGR)
Posted by Aditya Kaashyap 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
- In 1897; J. J. Thomson, a British physicist, proposed that atom contains at least one negatively charged particle. Later this particle was named as electron. Thomson called those particles ‘corpuscles’.
- Ernest Goldstein in 1886 discovered the presence of new radiation in gas discharge tube even before the identification of electron. He called these rays as Canal Rays. His experiment led to the discovery of proton.
- In 1932 J. Chadwick discovered another subatomic particle called neutron. Neutron is present in the nucleus of all atoms.
Posted by Mansi Singh 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
CFCs (ChloroFluoroCarbons) are the chemicals used in airconditioners and refrigerators which cause destruction of ozone layer present in the stratosphere of the atmosphere.
CFCs form active chlorine in the presence of UV radiations. Radicals produced are Cl and ClO. These radicals destroy ozone by converting it into oxygen. Oxygen just is a gas which remains in the atmosphere.
Sonu Raj Bhaskar 7 years, 1 month ago
Posted by Prashant Sharma 5 years, 11 months ago
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Yogita Ingle 7 years, 1 month ago
A part of CBSE's revised grading pattern for students of classes 9 and 11, the OTBA takes part in Summative Assessment II. Each year CBSE revises and provides suitable learning kit for the students to prepare for the OTBA exams.
Posted by Babalpreet Kaur 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
The limitations of Rutherford’s model of the atom are following:
(a) It does not explain the stability of atom.
(b) It does not explain the spectrum of hydrogen and other atoms.
Posted by Shivam Kumar 7 years, 1 month ago
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Posted by Pranjali Singhai 7 years, 1 month ago
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Gaurav Seth 7 years, 1 month ago
The atomic number is 5 as the atomic number means the number of proton present. The mass number is 5+6=11 as mass number is the sum of proton and neutron. So the electronic configuration of it is 2,3.
Posted by Rahul Pal 7 years, 1 month ago
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Gaurav Seth 7 years, 1 month ago
Initial Velocity( u) = 12 m/s
Final Velocity ( v) = 0 m/s
It comes to rest in 6 sec
To find : a= ?
distance covered in this time period = ?
Solution
v = u + at
0 = 12 + a× 6
-12/6= a
a= -2 m/sec²
distance
( I ) s= ut +1/2 at²
(II) 2as = v²-u²
by II formula
2×(-2) × s= (0)²-(12)²
-4s= -144
s= 36 m
by l formula
s = (0)×6+1/2×(2)(6)²
s= 0+1(36)
s=36 m
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