কাজ
খুশকি, সোরিয়াসিস, Seborrheic dermatitis, মাথার ত্বকের সেবোরোইক ডার্মাটাইটিস চিকিৎসায় নির্দেশিত হয়।
0 Answers
ভাব-সম্প্রসারণের নিয়ম কি কি?
ভাব-সম্প্রসারণের ক্ষেত্রে কয়েকটি দিকের প্রতি বিশেষ দৃষ্টি দেওয়া প্রয়োজন। যেমন : প্রদত্ত চরণ বা গদ্যাংশটি একাধিকবার অভিনিবেশসহকারে পড়তে হবে। লক্ষ্য হবে প্রচ্ছন্ন বা অন্তর্নিহিত ভাবটি কী, তা সহজে অনুধাবন করা...
1 Answers 6 views
List any two uses of coal ?
Coal is a fossil fuel which are used on the basis of their types Steam coal - also known as thermal coal - is mainly used in power generation. Coking coal - also...
1 Answers 1 views
Although coal and petroleum are produced by degradatioin of bio- mass, yet we need to conserve them. Why?
Both the energy sources coal and pertoleum take millions of years for their formation. As these resources are being utilised at a much faster rate than their formation, they will...
1 Answers 1 views
Describe the distribution of coal in India.
The distribution of coal in India is more abundant on the eastern side of the country. In India, coal occurs in rock series of two main geological ages—Gondwana and tertiary....
1 Answers 1 views
Thermodynamically the most stable form of carbon is (a) diamond (b) graphite (c) fullerenes (d) coal
(b) Graphite is thermodynamically the most stable form of carbon.
1 Answers 1 views
Identify and state the type of transformation of energy in the following cases: (a) When coal is burnt. (b) In a thermal power plant
(a) Chemical energy stored in coal is converted to heat energy. (b) Chemical energy of fuel is first converted into heat energy than to kinetic energy and finally to electrical energy.
1 Answers 1 views
Identify the solutions among the following mixtures. (a)Soil (b)Sea water (c) Air (d)Coal (e) Soda water.
Solutions among the following mixtures. (b) Sea water (c) Air (e) Soda water.
1 Answers 1 views
Describe how coal is formed from dead vegetation. What is this process called?
Millions of years ago, dense forests got buried under the soil due to natural processes like storms, floods, and earthquakes. These got compressed as more and more soil got deposited...
1 Answers 1 views
Fill in the blanks: (a) Burning of wood and coal causes _________of air. (b) A liquid fuel used in homes is ___________.
(a) Burning of wood and coal causes pollution of air. (b) A liquid fuel used in homes is LPG. (c) Fuel must be heated to its ignition temperature before it starts burning. (d)...
1 Answers 1 views
Why gas masks are used by miners in coal mines while working ?
[Hint : To absorb poisonous gases.]
1 Answers 1 views