CBSE Class 8 - Science Ch 13 - Sound (Worksheet)

Sound

Worksheet

Prolonged Use of Headphones and loud music can make you deaf

Write True or False for the senses given below. Also rewrite the false statements correctly:



1. Sound is a mechanical wave.

______________________________________________________


2. Sound can travel through vacuum.

_______________________________________________________



3. Sound is produced by a vibrating body.

_______________________________________________________



4. The maximum displacement of a body from its mean position is called amplitude of oscillation.

________________________________________________________


5. Loudness of a sound is measured in Hertz.

_______________________________________________________

CBSE Class 10 - Physics - Reflection of Light By Plane and Spherical Mirrors (V Short Q and A)

Reflection of Light By Plane and Spherical Mirrors

Laughing Mirrors use combination of Spherical Mirrors and Plane Mirrors.
Is this image real or virtual?

Very Short Question Answers (Based on NCERT Chapter)

Q1: What is the position of the object, when we get a diminished image with a concave mirror?

Answer: Beyond C (centre of curvature)

Q2: What are Marginal rays?

Answer: The rays which strike the mirror surface near the periphery are called marginal rays.

Q3: What type of rear mirrors are used by drivers in automobiles?

Answer: Convex mirrors

Q4: What is the relation between the radius of curvature (R) and focal length (f) of a concave mirror?

Answer: R = 2f

Q5: What is a focal length in case of spherical mirrors?

Answer: It is the distance between focal length and focus.

Q6: An object is moving with a speed v towards a plane mirror, what is the speed of the image?

CBSE Class 7 - Geography - CH 9 Life In The Temperate Grasslands (NCERT Solutions)

Life In The Temperate Grasslands

NCERT Chapter Solutions

Prairies - Temperate Grasslands in USA

Q1: What are the Temperate Grasslands of North America called?

Answer: The temperature grasslands of North America are called Prairies.



Q2: What are the cattle farms in the North American Grasslands known as?

Answer: The cattle farms in North America are known as Ranches.



Q3: Name the rivers that drain the Velds.

Answer: The tributaries of rivers Orange and Limpopo drain the Velds.



Q4: When is the rainy season in the Velds?


Answer: In the summer month from November  to February.



Q5: What is the major occupation of the people of the South African grasslands?

Answer: Sheep rearing  

CBSE Class 8 - Science - CH 15 - Some Natural Phenomena (Worksheet)

Some Natural Phenomena

Tsunami hits at San Jose: picture by Angela Riddock

Worksheet based on Class 8 NCERT Chapter 15

Fill in the blanks with appropriate words given below:

seismograph, Ritcher scale, static, earthquake, positive, earthing, thunder, Like charges, seismic waves, unlike charges, electroscope

1. _______ electricity consists of electric charges which do not flow.


2. A glass rod when rubbed with a piece of silk cloth gets charged with ________ charge.


3. Seismic waves are recorded by an instrument called ____________.


4. An explosive sound heard during lightning is termed as _________.


5. _____ _______ repel each other while ______ _______ attract each other.

CBSE Class 7 - Geography - CH8 - HUMAN ENVIRONMENT INTERACTIONS: THE TROPICAL AND THE SUBTROPICAL REGION (NCERT Solution)

HUMAN ENVIRONMENT INTERACTIONS:

THE TROPICAL AND
THE SUBTROPICAL REGION

One Horn Rhinoceros - Found at Assam
image credits: wikipedia 

NCERT Chapter Solutions

Q1: Name the continent in which the Amazon Basin located.

Answer: Amazon Basin is located in South  America.

Q2: What are the crops grown by the people of Amazon Basin?

Answer: The crops grown by the people of Amazon basin are:
(i) Coffee 
   (ii) Maize 
  (iii) Cocoa.

Q3: Name the birds that you are likely to find in the rain-forests of the Amazon.

Answer: Birds likely find in rain forests of Amazon basin are:
   (i) Toucans, 
  (ii) Humming birds,
  (iii) birds of paradise with their brilliantly coloured plumage.


Q4: What are the major cities located on the River Ganga?

Answer: (i) Allahabad (ii) Kanpur (iii) Varanasi
(iv) Haridwar (v) Patna (vi) Kolkatta.

CBSE Class 6 - 8 : संज्ञा – विकार कारक

संज्ञा – विकार कारक

प्रश्न.1 कारक किसे कहते है?

उतर- संज्ञा या सर्वनाम के जिस रूप से वाक्य के किसी दुसरे शब्द के साथ उसका संबंध जाना जाए, वह कारक कहलाता है|

प्रश्न.2. कारक के कितने  भेद होते है?

उतर- कारक के आठ भेद होते है:

        1. कर्ता कारक 

  2. कर्म कारक

3. करण कारक 

        4. संप्रदान कारक

        5. अपादान कारक

        6. संबंध कारक

        7. अधिकरण कारक

        8. संबोधन कारक

प्रश्न. 3. करता कारक किसे कहते है?

उतर- संज्ञा या सर्वनाम के उस भेद को करता कहते है जिससे क्रिया के करने वाले का भोड़ होता है| 

प्रश्न.4. कर्म कारक किसे कहते है?

उतर- जिस शब्द पर क्रिया का प्रभाव पड़े, उसे कर्म कारक कहते है|

प्रश्न.5. कर्ण कारक किसे कहते है?

उतर- करता जिस साधन की सहायता से काम करता है, उसे कर्ण कारक कहा जाता है|

Quiz on Sobriquets

Quiz on Sobriquets

A sobriquet is a nickname often more popular than the real name of a person or place or thing. It is usually a familiar name not a pseudonym.

Test your knowledge how many Sobriquets do you know?


Q1: Name the Indian political leader who is also popularly called 'Loknayak'?

(a) Mohandas Karamchand Gandhi
(b) Jayprakash Narayn
(c) Atal Bihari Bajpai
(d) Vallabh Bhai Patel


Q2: Who is also known as Frontier Gandhi?

(a) Mohandas Karamchand Gandhi
(b) Feroz Gandhi
(c) Abdul Gaffar Khan
(d) C R Das


Q3: Who is popularly called Iron Lady?

(a) Margaret Thatcher
(b) Madonna
(c) Indira Gandhi
(d) Lady Gaga


Q4: Who is also called as Grand Old Man of India?

(a) Rabindra Nath Tagore
(b) Subhash Chander Bose
(c) Vallabh Bhai Patel
(d) Dada Bhai Naroji


Q5: Who is often called as the king of Rock n Roll?

(a) Michael Jackson
(b) Bruce Springsteen
(c) Elvis Presley
(d) George Michael