Periodic Properties (I)
Diversity in the living world
Solid State (P)
Reproduction in organisms
U&D, Vector, Kinematics (11th)
Periodic Properties (I) , Atomic Structure (P) , Nomenclature (O)
Diversity in the living world, Reproduction in organisms
PART - I
The quantities which can be measured by an instrument and by means of which we can describe the laws of physics are called physical quantities.
Types of physical quantities :
Seven physical fundamental quantities
(4) electric current,
(5) thermodynamic temperature
(6) amount of substance
(7) luminous intensity
(i) Metre : 1m = 1,650, 763.73 wavelengths in vaccum, of radiation corresponding to organ-red light of krypton-86.
(ii) Second : 1s = 9,192, 631,770 time periods of a particular form Ceasium - 133 atom.
(iii) Kilogram : 1kg = mass of 1 litre volume of water at 4°C
(iv) Ampere : It is the current which when flows through two infinitely long straight conductors of negligible cross-section placed at a distance of one metre in vacuum produces a force of 2 × 10–7 N/m between them.
(v) Kelvin : 1K = 1/273.16 part of the thermodynamic temperature of triple point of water.
(vi) Mole : It is the amount of substance of a system which contains as many elementary particles (atoms, molecules, ions etc.) as there are atoms in 12g of carbon - 12.
(vii) Candela : It is luminous intensity in a perpendicular direction of a surface of of a black body at the temperature of freezing point under a pressure of 1.013 × 105 N/m2.
By learning in meritnation I got B2, but by learning topper learning I got A1... so which is the best. This is awesome to learn and easy to study science. At 1st term I got B2 but at 2nd term I got A1.
Manoj Vijay CBSE class IX
Excellent Faculty! I have been studying from topperlearning.com since Class IX and have consistently scored above 90% in my these 4 years.I studied throughout nights to achieve my goal.Moreover, becoming Rank 1 on topperlearning boosted my confidence to high skies.Thank you topperlearning, without you I would not have been able to score 91.2% in Class XII Boards(2015) and CGPA 9.8 in my Class X Boards(2013). Hope that topperlearning will continue to help students throughout India, creating a brighter future for them. Regards, Vivek Saahil
Vivek Saahil CBSE class XII Science
I like topper learning because I can understand the level I have prepared for my subject and study better.
Mohanapriya Saravanakumar CBSE class X
Topperlearning is really a very good helping tool. Every time I had doubts related to any concept in PCM I posted it and immediately my problem was solved. It also helped me in scoring good ranks in competitive exams too. The topper faculty is very good. The teachers explained each and every concept in depth. My favourite teacher is Physics teacher
Sahibdeep Singh Sodhi CBSE class XII Science
We all know that audio-visual medium is a better way of explaining and educating the students. It not only makes learning fun but also gives the message more clearly and precisely. Topper is a very good amalgamation of good teaching and good learning methods.
Sonia Malik, Professor
VV DAV School, New Delhi class ALL Class
Queries asked on Sunday and after 7 pm from Monday to Saturday will be answered after 12 pm the next working day.