NCERT Solutions for Class 9 Science Chapter 4 – Structure of the Atom
1)What are canal rays?
Soln:
Canal rays are radiations which are positively charged and was the key in the discovery of proton, another positively charged subatomic particle.
2) If an atom contains one electron and one proton, will it carry any […]
General Question: Illustrate the relationship between a mole, Avogadro’s number and Mass.
Q1. A reaction is taking place wherein, 5g of sodium carbonate reacts with 7.2 gm of ethanoic acid. The products are 4.2g carbon dioxide, 3g water and 5g […]
NCERT Solutions for Class 9 Science Chapter 1 – Matter in our Surroundings
Text Questions:
1) Which of the following is matter? Chair, air, love, smell, hate, almond, thought, cold, cold drink, smell of perfume.
Soln:
Chair, Air, Almond, Cold drink.
2) Give a reason for the following observation: The smell of hot sizzling food […]
CBSE has been announced the result of JEE Main 2017 on April 27. All of the applicants who participate in the engineering entrance examination can access their result in online mode. The scores of the applicants has been published in JEE Main 2017 result. The status of those applicants who have qualified for the second […]
JEE Main Syllabus 2018 gives details of the topics and chapters covered for section-wise weightage of JEE Main 2018 paper. JEE Main 2018 syllabus will be announced by CBSE. With the help of JEE Main syllabus 2018, the aspiring candidates will have a clear understanding on what to study and what to avoid. JEE Main 2018 […]
CBSE Syllabus is the list of topics and subtopics to be covered in the course of study during an academic year. CBSE syllabus includes the summary and gist of content to be gone through during teaching and learning process in a particular grade or class. CBSE issues syllabus booklets for classes 9, 10, 11 and 12. […]
ICSE Syllabus is extremely comprehensive and thorough. Great emphasis is laid on the learning of science, humanities and language. Although the volume of the syllabus is something students often complain about during school days, it really helps them cope up with higher education and competitive preparation later in life.
ICSE Syllabus focuses on […]
Exercise – 13.1
Q.1: Q and R are events such as P(Q) = 0.6 , P(R) = 0.3, P(Q∩R) = 0.2. Determine the value of P(QR) and P(
Short answer questions:
Sol. Here , edge of there metallic cubes are 3 cm, 4cm, and 5cm.
Volume of single cube =
1. If perimeter of a circle is equal to that of a square, What would be the ratio of their areas.
Here, perimeter of circle = 2πr and perimeter of square = 4a
∴2
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