Acids, Bases and Salts CBSE Class 7 Important Question and Answers

Acids, Bases and Salts
1.Name the following:
(i) Substances which furnish hydronium ion in solution.
Ans. Acids
(ii) Substances which turn blue litmus solution red.
Ans.Acids

CBSE Class X Sample paper Science 2016

CBSE Sample Paper-03
SUMMATIVE ASSESSMENT –I
SCIENCE (Theory)
Class – X


1.What happens when a chemical reaction occurs?
2. Name the excretory unit of kidney.
3. There are two electric bulbs (i) marked 60 W, 220 V and (ii) marked 100 W, 220 V. Which one
of the two has a higher resistance?

Science Class 10 Sample paper 2016

 CBSE Sample Paper-02
SUMMATIVE ASSESSMENT –I
SCIENCE (Theory)
Class – X

 Time allowed: 3 hours Maximum Marks: 90
General Instructions:
a) All questions are compulsory.
b) The question paper comprises of two sections, A and B. You are to attempt both the sections.
c) Questions 1 to 3 in section A are one mark questions. These are to be answered in one word
or in one sentence.
d) Questions 4 to 6 in section A are two marks questions. These are to be answered in about 30
words each.
e) Questions 7 to 18 in section A are three marks questions. These are to be answered in about
50 words each.
f) Questions 19 to 24 in section A are five marks questions. These are to be answered in about
70 words each.
g) Questions 25 to 27 in section B are 2 marks questions and Questions 28 to 36 are multiple
choice questions based on practical skills. Each question of multiple choice questions is a one
mark question. You are to select one most appropriate response out of the four provided to
you.



1.Why does milk become sour if kept for a long time?
2. Name the respiratory organs of: (i) fish, (ii) mosquito, (iii) earthworm.

Class X Science Sample Paper 2016

 CBSE Sample Paper 2016
SUMMATIVE ASSESSMENT –I
SCIENCE (Theory)
Class – X
Q1/ What happens when a chemical reaction occurs?

2. Name the two stages of photosynthesis.

3. What is meant by the statement, “Potential difference between points A and B in an electric
field is 1 volt”?

Microorganisms Friends and Foe Class 8 CBSE Ncert Solutions

1. Fill in the blanks . 
a. Microorganisms can be seen with the help of a microscope .
b. Blue green algae fix nitrogen directly from air to enhance fertility of soil.
 c. Alcohol is produced with the help of yeast .
d. Cholera is caused by bacteria

CELL - STRUCTURE AND FUNCTIONS Class 8 CBSE NCERT Solutions

NCERT Book Solutions of Cell Structure and Functions

1. Indicate whether the following statements are True or False.
a. Unicellular organisms have one celled body. True
b. Muscle cells are branched. False
 c. The basic living unit of an organism is an organ. False
d. Amoeba has irregular shape. True

Magnetic Effects of Electric Current Class 10 CBSE Important Question and Answers

Q1.State the factors on which strength of magnetic field at a point due to a current carrying conductor depends?
Ans. The factors on which strength of a magne tic field at a point depends.
(1) Amount of current (I) flowing through the conductor
(2) Distance (r) from the current carrying conductor.

Control and Coordination CBSE Class X Scinece Exemplar Solutions

Control and Coordination 
Solutions of Science Exemplar Problems 
Multiple Choice Questions
1. Which of the following statements is correct about receptors?
(a) Gustatory receptors detect taste while olfactory receptors detect smell
(b) Both gustatory and olfactory receptors detect smell
(c) Auditory receptors detect smell and olfactory receptors detect taste
(d) Olfactory receptors detect taste and gustatory receptors smell

CHAPTER 3: NAZISM AND THE RISE OF HITLER Important Question and Answers

Q.1. Describe what happened to Germany after its defeat in the First World War.
Ans.1- World War I, ended with the Allies defeating Germany and the Central powers inNovember 1918. 2-The Peace Treaty at Versailles with the Allies was a harsh and humiliating treaty. Germany lost its overseas colonies, a tenth of its population, 13 per cent of its territories, 75 per cent of its iron and 26 per cent of its coal to France, Poland, Denmark and Lithuania. 3-The Allied Powers demilitarised Germany to weaken its power. Germany was forced to pay compensation amounting to 6 billion.

Q.2.Give reasons for Hitler’s rise to power.
Ans (i) The economic crisis: Germany had to face a great economic crisis after the First WorldWar. Many soldiers were no longer in service, so they became unemployed. Trade and commerce was ruined. Germany was in the grip of unemployment and starvation. (ii) Exploiting the mentality of the Germans: The Germans had no faith in democracy. It was against their culture and tradition. They at once gave their support to a strong man like Hitler who could transfer their dreams into reality. (iii) Making the best use of his personal qualities: Hitler was a powerful orator, an able Organiser.

CHAPTER 3: NAZISM AND THE RISE OF HITLER CBSE Class 9

BIRTH OF THE WEIMER REPUBLIC:
Germany fought the First World War (1914–1918) along with the Austrian empire and against the Allies (England, France and Russia). Germany initially made gains by occupying France and Belgium. However, the Allies won defeating Germany and the Central Powers in 1918.A National Assembly met at Weimer and established a democratic constitution with a federal structure. The republic, however, was not received well by its own people largely because of the terms it was forced to accept after Germany’s defeat at the end of the First World War. Many Germans held the new Weimer Republic responsible for not only the defeat in the war but the disgrace at Versailles.

The French Revolution:Important Question and Answers

Important Question and Answers from The French Revolution Class 9 CBSE

Q.1. what was the subsistence crisis? Why did it occur in France during the Old Regime?
Ans. 1- The population of France was on the rise. It rose from 23 million in 1715 to 28 million in 1789.This led to increase in the demand for food grains.
2-The production of food grains could not keep pace with the demand and the price of bread which was
thestaple diet of the majority Rose rapidly.
3- The wages also did not keep pace with the rise in prices. The gap between the Rich and the poor widened. This led to the subsistence crisis.

The French Revolution Class 9 CBSE Important Notes

 Important Notes of The French Revolution:
Chapter 1 Class 9

CONCEPTS
The French Society during the Late 18th Century
The French Society Comprised:1st Estate: Clergy, 2nd Estate: Nobility, 3rd Estate: Big businessmen,merchants,
court officials, peasants, artisans, landless labourers, servants, etc.
Some within the Third Estate were rich and some were poor.
The burden of financing activities of the state through taxes was borne by the Third Estate alone.
The Struggle for Survival: Population of France grew and so did the demand for grain. The gap between the rich
and poor widened. This led to subsistence crise

Class X Science Exemplar Solutions:Acids Bases and Salts

EXEMPLAR PROBLEMS – SCIENCE Class X Acids Bases And Salts solutions
 

Ans. Lactic Acid: Curd
        Acetic Acid: Vinegar
       Citric Acid: Lemon
       Oxalic Acid: Tomato

Acids Bases and Salts MCQs

Multiple Choice Questions from Acids Bases and Salts

1. What happens when a solution of an acid is mixed with a solution
of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place
(a) (i) only (b) (i) and (iii)
(c) (ii) and (iii) (d) (i) and (iv)

2. An aqueous solution turns red litmus solution blue. Excess
addition of which of the following solution would reverse the
change?
(a) Baking powder
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid

Weather, Climate and Adaptations of Animals to Climate Class 7 CBSE

Key and Important notes of  Weather, Climate and Adaptations of Animals to Climate Class 7 CBSE

Weather: It is the day to day condition of the atmosphere at a place influenced by factors like humidity,temperature, wind speed, precipitation. It is a complex phenomenon that it can vary over very short period of times, therefore it is very hard to predict weather

Humidity: It is the amount of water vapour present in the atmosphere and is measured by a hygrometer

Class 7 Water a Precious Resource MCQs

Water a Precious Resource CBSE Class 7 Science

Key and Important notes of Water a precious Resource
 
World Water Day: 22 March is celebrated as World Water day. It's purpose is to attract the attention of everybody towards the Importance of conserving water.

Minimum Required Water: According to Research b y United Nations, each individual requires about 50 litres of water per day to go through daily tasks

Novels, Society and History CBSE Class 10 Important Question and Answers

Short Answer Questions

What do you know about Anandamath?
Ans. It is a novel written by Bankimchandra.This novel is about Hindu militia that fights Muslims to establish Hindu Kingdom

Democracy and Diversity CBSE Class X Political Science

1.What did the African American athlete do in order t o draw international attention to Black poverty in the Mexico Olympics?
Ans.A. Johan Carlos and Tommie Smith of US were Black Americans.
B. They were similar and but different from Peter Norm an who was white from Australia.
C. But they were all athlete who stood up against racial discrimination.

Water Resources CBSE Class Ten Geography

1.Why are multipurpose projects called as temples of modern world
Ans.Jawaharlal Nehru proudly proclaimed the dams as the ‘Temples of the modern India’ due to the following reasons:
 A.It would integrate development of agriculture and the village economy with rapid industrialization and growth of the urban economy.
B.They not only help in irrigation but also help in e lectricity generation, water supply for domestic and industrial uses, flood control, re creation, inland navigation and fish breeding.

Electricity CBSE Class X

Important notes of Class 10 Physics chapter electricity.

How to write a Factual Description

How to write a factual description

What is factual description
Factual description is a piece of writing that describes a person,place thing, or an event factually.In such a description,although the emphasis is on objectivity and facts, there is a lot of scope for creativity and innovation.