Q1. Give one example of Döbereiner’s Triad. Ans. Li, Na, K 7 23 39 Q2. How many triads could Döbereiner identify from the existing elements then? Ans. Döbernier could identify only three triads. Q3. What is the limitation of Döbereiner triads? Ans. He failed to arrange all the elements in triads having same chemical properties. … Read more
VERY SHORT ANSWER TYPE QUESTIONS (1 Mark) Q1. What is a hydrocarbon?Ans. It is a compound of hydrogen and carbon. Q2. Give different forms in which carbon occurs in nature.Ans. Carbon occurs in free form e.g., graphite and diamond in combined form like carbon dioxide, carbonates, etc.In earth’s crust–0.02% and in atmosphere–0.03%. Q3. Name two … Read more
Important Questions With Answers 1. How is the eye lens held in its position? Ans: – Ciliary muscles hold the eye in position. 2. What is meant by near point? Ans: – The nearest point up to which an eye can see clearly is called the near point of the eye. 3. What is meant … Read more
Here we are providing numerical assignment on class 10 science chapter human eye and colourful world. Answers are also provided for reference. Numerical Problems on Human Eye and Colourful World Class 10 Science · The Human Eye N Eye Defects Practice Set 1 Apply lens formula $\frac{1}{v} – \frac{1}{u} = \frac{1}{f}$ for vision correction Ch … Read more
Class 10 Biology How Do Organisms Reproduce Important Questions Very Short Answer Questions [1 Marks] 1. Define reproduction. Ans. The process of producing new individuals of the same species by existing organisms, i.e., parents, is known as reproduction. 2. Name two organisms that show asexual reproduction. Ans. Amoeba and yeast show asexual reproduction. 3. … Read more
Very Short Answer Questions [1 marks] 1. Define lens.Ans. A piece of optical material bounded by one or two spherical surfaces is called lens. 2. Why is a convex lens called converging lens? Ans. It is because a parallel beam of light on passing through it converges at a point. 3. Define optical centre of a … Read more
Very Short Answer Questions Blue and red litmus papers are placed simultaneously in a colourless aqueous solution. It is found that the colour of both litmus papers is red. What is the nature of the solution and why? A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with … Read more
Q1. Which of the following is a green house gas? (a) Nitrogen dioxide (b) Sulphur dioxide (c) Carbon dioxide (d) Carbon monoxide Q2. Floods can be prevented by (a) afforestation … Read more
I. VERY SHORT ANSWER TYPE QUESTIONS (1 Mark) Q1. Define heredity. Ans. Heredity deals with the inheritance of characters from one generation to the next. Q2. Define variations. Ans. Variations are differences that occur between the organisms of the same species in spite of the same basic feature. Q3. How does the creation of variations in … Read more
Very Short Answer Type Questions: 1. Define electric work. 2. What is the unit of electric work? Define it, in relation to quantity of charge and potential difference. 3. Name two bigger units of electric work. 4. What do you understand by the term current electricity? 5. Define the term “electric current”. 6. How is … Read more
