NCERT Solutions : Class 9th Chapter 5 The Fundamental Unit of Life (Science) In Text Questions Class Nine Science . Cell: Fundamental Unit…
NCERT Solutions for Class 9th: Ch 1 Matter in Our Surroundings Science In Text Questions Page No: 3 1. Which of the following are matter? C…
Holograms are among the best things we've ever made. They help us project real-like objects residing miles away. They help us bring our digital…
28 February is celebrated as National Science Day in India. It was on this day in 1928 that Sir C V Raman’s experiments led to the discovery of wha…
Describe the regional variations in the climatic conditions of India with the help of suitable examples. Answer: Indian Peninsular shows wide variat…
Dalton’s Atomic Theory John Dalton, a British Chemists and scientists gave the Atomic Theory in 1808. This theory is popularly known as Dalton’s Ato…
Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water? Answer: In a 20% solution containing 100…
You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separa…
Burning of kerosene in a lantern. Answer: While burning of kerosene in a lantern carbon dioxide, and water vapour is formed, hence it is a Chemical …
Rising of hot air over a radiator. Answer: Since, in rising of hot air over a radiator no new substance is formed, hence it is a Physical change.
Drying of a shirt in the sun. Answer: Drying of shirt in the sun is a Physical change. Since in this change no new substance is formed.
Can you suggest two more solutions which would show the same effect as shown by the milk solution? Answer: Soap bubbles and fog are the colloids, he…
Same results were not observed with a salt solution. Explain. Answer: For scattering of light the size of particles should be large enough. Since th…
Iron filings and sulphur were mixed together and divided into two parts, ‘A’ and ‘B’. Part ‘A’ was heated strongly while Part ‘B’ was not heated. Di…
Can a solution be heterogeneous? Answer: Solution is defined as the homogeneous mixture, hence a solution cannot be heterogeneous. But when a mixtur…
A solution is always a liquid. Comment. Answer: Since, a solution is the homogeneous mixture of two or more substances, thus it is not necessary tha…
Under which category of mixtures will you classify alloys and why? Answer: When constituent particles of a combination of two or more element or com…
Name a non-metal which is known to form the largest number of compounds. Answer: Carbon is a non-metal. It is known to form the largest number of co…
The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope. Answer: Graphite. Graphite is a good conductor of electri…
Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain. Answer: The mixture o…