Tuesday, May 17, 2016

Class 12 - Physics - Chapter 4: Moving Charges and Magnetism (VSQA)

Moving Charges and Magnetism

Very Short Q & A

Class 12 - Physics - Chapter 4: Moving Charges and Magnetism (VSQA)

Q1: Define Magnetic Field.

Answer: The space around a magnet within which its effect is experienced is called Magnetic Field (B).


Q2: What is the SI unit of magnetic field?

Answer: Tesla. Another unit is Newton Ampere-1 metre-1


Q3: What is a solenoid?

Answer: A solenoid is a circular coil of a large number of turns, such that the turns of solenoid run parallel to its length. It acts similar to a bar magnet.


Q4: What is Lorentz force?

Answer: The total force on a charge (q) moving with a velocity (v) in the presence of magnetic and electric field (B and F) respectively is called Lorentz force.


Q5: What is a cyclotron?

Answer: It is a machine to accelerate charged particles or ions to high energies


Q6: What is the operational definition of one ampere?

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Friday, May 13, 2016

CBSE Class 8 - Science - METALS and NON Metals : Question and Answers

METALS and NON Metals : 
Question and Answers

Prachi Class 8 Science Textbook Solutions

CBSE Class 8 - Science - METALS and NON Metals : Question and Answers
Activity Series


Q1: Identify the type of elements which are neither malleable nor ductile.

Answer: Non-metals (eg Carbon, Phosphorous, Sulphur, Nitrogen) are neither malleable nor ductile.


Q2: Name a property which is common to the metals occurring near the bottom of the reactivity series.

Answer: These (Silver, Gold and Platinum) are least reactive metals and are found in free state in the earth's crust.


Q3: Name a metal that is kept under kerosene.

Answer: Sodium.


Q4: What type of reaction is the reaction between copper sulphate solution and zinc plate?

Answer: It is a displacement reaction.
        Zn + Copper Sulphate ---------> Zinc Sulphate + Copper

(Explanation: Zinc is more reactive than copper, Therefore Zn displaces Cu.)



Q5: An oxide of sulphur turns blue litmus red. Is it acidic or basic?

Answer: Acidic

Wednesday, May 4, 2016

CBSE Class 10 - Physics - CH 12 Electricity (Worksheet)

Electricity

CBSE Class 10 - Physics - CH 12 Electricity (Worksheet)

Worksheet


Fill in the blanks

1. The source of all electricity is ______. It’s SI unit is _________.


2. The net charge flowing through a cross section of a conductor in unit time is called ________.


3. Electric potential difference between points in an electric circuit is the ______ _______ to move a unit charge from one point to other. i.e. 1V = ____/1C.


4. Current is measured in Amperes using _______.


5. If 90 coulombs charge passes through the conductor for 5 minutes, then the current in the conductor is _____.


6. A _________ is an electronic measuring instrument the combines several measuring functions (electric potential difference, electric current and electric resistance) in one unit.


Friday, April 29, 2016

CBSE Class 9: Biology - Chapter - Fundamental Unit of Life - Quiz on Cell Organelles

Quiz on Cell Organelles

Identify the labelled parts of cell and name them.
Answer given below.
Image Attribution: By Kelvinsong (Own work) [CC0], via Wikimedia Commons


Read the following questions. Each question gives you a hint about a cell organelle, identify and write down its name.


Q1: Jelly like substance containing particles and other organelles. What is it?

Q2: A partially permeable layer prevents cell contents from escaping controls what substances enter and leave the cell. Identify?

Q3: A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.

Q4: Contains green colour pigment, traps light energy. Present in some plant cells.

Q5: Appear brown dots either present freely in cell or bound to a membrane and make proteins.

Wednesday, April 27, 2016

CBSE Class 8 - Geography - LAND, SOIL, WATER, NATURAL VEGETATION AND WILDLIFE RESOURCES (NCERT Chapter Solutions)

LAND, SOIL, WATER, NATURAL VEGETATION AND WILDLIFE RESOURCES

CBSE Class 8 - Geography - LAND, SOIL, WATER, NATURAL VEGETATION AND WILDLIFE RESOURCES (NCERT Chapter Solutions)

NCERT Chapter Solutions and other Q & A



Q1. Which are the two main climatic factors responsible for soil formation?

Answer: Temperature and rainfall


Q2: Write any two reasons for land degradation today.

Answer:

  i. deforestation,
  ii. overgrazing,
  iii. overuse of chemical feritilisers or pesticides,
  iv. landslides and floods
  v. urbanization on arable land


Q3: Why is land considered an important resource?

Answer: Land is considered as an important resource because:

i. it provides habitation to a wide variety of flora and fauna.
ii. We use it for various purposes such as agriculture, forestry, mining, building houses and roads, and setting up industries.


Q4: What type of land is sparsely populated or uninhabitated?

Answer: The land having rugged topography, steep slopes of the mountains, low-lying areas susceptible to water logging, desert areas, thick forested areas are normally sparsely populated or uninhabited.


Q5: Name any two steps that government has taken to conserve plants and animals.

Answer: Two steps taken by the government to conserve plants and animals:
i. Setting up national parks, wildlife sanctuaries and biosphere reserves to protect natural vegetation and wildlife. e.g. the Kaziranga National Park in Assam.

ii. Ban on killing or hunting of animals lions, tigers, deer, great Indian bustards and peacocks.

iii. Prohibited trade of the species of plants and animals protected under the international agreement CITES.

Saturday, April 23, 2016

CBSE Class 8 - Living Science (CCE Edition) : Crop Production (Text Book Answers)

Living Science (CCE Edition) : Crop Production 

CBSE Class 8 - Living Science (CCE Edition) : Crop Production (Text Book Answers)

Textbook Answers



Multiple Choice Questions (pg 20)

Q: Which of these is not a cereal?...


Answers:

1: (a) Gram
Explanation: Gram is a legume (pulses) while others are cereals

2: (a) Wheat
Explanation: Wheat is a rabi (winter) crop.

3: (a) organic nutrients
Explanation: Compost is made of dead and decaying organic matter.

4: (a) Wilt
Explanation: Wilt is caused by bacteria while others are fungal infections.

5: (c) it prevents soil erosion.
Explanation: Ploughing loosens soil so that more air can fill up the spaces.

6: (d) All of these

7: (d) ploughing
Explanation: Manuring or Fertilizers or Field Fallowing add nutrients.

8: (b) Combine



VERY SHORT ANSWER QUESTIONS (One word answers) - Pg 20-21

Q1. About how many years ago did agriculture begin?...


Thursday, April 21, 2016

CBSE Class 8 - Civics - Chapter 1: The Indian Constitution (Questions and Answers)

Chapter: The Indian Constitution

CBSE Class 8 - Civics - Chapter 1: The Indian Constitution (Questions and Answers)

Q & A based on NCERT chapter




       Want to download the latest Constitution of India document (March 4, 2016). Click here.


Q1: What is a constitution?

Answer: A constitution is document consisting of basic rules or principles according to which the people of a country are governed.


Q2: What purposes are served by Indian Constitution?

Answer: The constitution serves several purposes such as:

  (i)  It lays out certain ideals which form the basis of kind of country we aspire to live in.
  (ii) It helps serve basic set of rules to govern the nation.
  (iii) It defines the nature of political system. It provides guidelines how government should be elected and its machinery should work.
  (iv)  It ensures that a dominant group does not use its power against other, less powerful people or groups.


Q3: Name the national goals laid out by our constitution.

Answer: Democracy, Secularism and Socialism.


Q4: In which of the following situations is a minister misusing his power:

a) refuses to sanction a project of his ministry for sound technical reasons;
b) threatens to send his security staff to rough up his neighbour.
c) calls up the police station asking them not to register a complaint that is likely to be filed against his relative.

Answer: Case (b) and (c) where the minister is misusing his power.


Q5: How does Indian constitution guarantees the right to equality to all citizens?

Answer: The Indian Constitution guarantees the right to equality to all persons and says that no citizen can be discriminated against on grounds of religion, race, caste, gender, and place of birth. It is a Fundamental right.