CBSE CLASS 12 - PHYSICS - RAY OPTICS AND OPTICAL INSTRUMENTS - Very Short Question Answers (#cbsenotes)

RAY OPTICS AND OPTICAL INSTRUMENTS

CBSE CLASS 12 - PHYSICS

Very Short Question Answers

Q1: What is the focal length and power of a plane glass plate?

Answer: Focal length of plane glass is infinite and its power = 0.


Q2: What is the mathematical relation between object distance (p) and image distance (i) in a plane mirror?

Answer: i = -p


Q3: An object is placed at the focus of  concave lens. Where will its image be formed? 

Answer: The real image will be formed at infinity.


Q4: If the speed of light were the same in all media, would refraction still occur when light passes from one medium to another? 

Answer: No change in speed of light causes bending of light rays in refraction.

CBSE Class 7 Maths - Data Handling - NCERT EXERCISE 3.4 (#cbsenotes)

Data Handling

EXERCISE 3.4

CBSE Class 7 Maths

Q1: Tell whether the following is certain to happen, impossible can happen but not certain.
(i) You are older today than yesterday.
(ii) A tossed coin will land heads up.
(iii) A die when tossed shall land up with 8 on top.
(iv) The next traffic light seen will be green.
(v) Tomorrow will be a cloudy day.

Answer:
(i) It is certain to happen.
(ii) It can happen but not certain.
(iii)It is impossible.
(iv) It can happen but not certain.
(v)  It can happen but not certain.

CBSE Class 9 - English (Communicative) - Poetry - The Seven Ages - Summary (#cbseNotes)

The Seven Ages - Summary

Seven Ages Sculpture at Queen Victoria Street
credits: By Lonpicman (Own work)
[CC BY-SA 3.0 () or GFDL], via Wikimedia Commons

About The Poet:

William Shakespeare is viewed as the best author ever. He Paints a distinctive and clear impression of individuals. He gives a philosophical yet straightforward perspective of human life.

Summary:

The poem is a correlation nearby individual life with that to a drama.  Just like a man plays many parts in a melodrama, the man plays many parts as he progresses through different phases of his life. Like a movie or theatre play has entrances and exits thus life also bicker in life and death respectively. With their birth, men and women came to live and play competent extraordinary roles and flow away with death. The parts performed by them are generally seven.

CBSE Class 11 Chemistry -Syllabus (2017-18) (#cbsenotes)

Chemistry -Syllabus (2017-18)

CBSE Class 11 Chemistry

Here presents the prescribed syllabus for Class 11 Chemistry for the curriculum 2017-18.

CBSE Class 10 Chemistry - CH2 Acids and Bases - Very Short Questions and Answers (#cbsenotes)

Acids and Bases  

Very Short Questions and Answers

Class 10 Science - Chemistry

Q1: What is an acid?

Answer: Acid is a compound which yields hydrogen ions (H⁺) or Hydronium (H₃O⁺) ions , when dissolved in water.


Q2: What is the pH value of acids?

Answer: Less than 7 (i.e. 0 to < 7)


Q3: What is the taste of acids?

Answer: Sour


Q4: What happens to blue litmus paper when it comes in contact with acid solution?

Answer: It turns into red.


Q5: On the basis of origin, how acids are classified as?

Answer: Organic acids and Mineral acids.

CBSE Class 10/9/8 - English - Reading Comprehension (Set-8) (#cbsenotes)

Reading Comprehension

(NTSE 2015) Read the comprehension passage and answer the following questions:

Marie Curie was one of the most accomplished scientists in history. Together with her husband, Pierre, she discovered radium, an element widely used for treating cancer and studied uranium and other radioactive substances. Pierre and Marie’s amicable collaboration later helped to unlock the secrets of the atom.

Marie was born in 1867 in Warsaw, Poland, where her father was a professor of Physics. At an early age, she displayed a brilliant mind and blithe personality. Her great exuberance for learning prompted her to continue with her studies after high school. She became disgruntled, however, when she learned that the university in Warsaw was closed to women, Determined to receive a higher education, she defiantly left Poland and in 1891 entered the Sorbonne, a French university, where she earned her master’s degree and the doctorate in Physics.

CBSE Class 12 Chemistry - Syllabus (2017-18) (#cbsenotes)

Chemistry -Syllabus (2017-18)

CBSE Class 12 Chemistry

Here presents the prescribed syllabus for Class 12 Chemistry for the curriculum 2017-18.