CBSE Class 7 - Science SA2 Sample Question Paper (2016-17)

CBSE Class 7 - Science SA2 Sample Question Paper (2016-17)

CBSE Class 8 - Maths SA2 Sample Question Paper (2016-17)(#cbsepapers)

CBSE Class 8 - Maths SA2 Sample Question Paper (2016-17)

CBSE Class 8 - Science -SA2 Sample Question Paper (2016-17)

CBSE Class 8 - Science SA2 Sample Question Paper (2016-17)

CBSE Class 9 Chemistry - Questions based on Mole Concept (#cbsenotes)(#class9SA2Chemistry)

Questions Based on Mole Concept

CBSE Class 9 Chemistry

Q1: Fill in the blank.

The mole (mol) is the amount of a substance that contains as many elementary entities as there are atoms in exactly ________ of C₁₂


Answer: 12g or 12 grams.



Q2: I owe you 1 mole of rupees. How many rupees do I have to pay for you?


Answer: 6.022 × 10²³ rupees.


Q3: Is mole a unit?

Answer: No, it is a large constant number called Avagadro's constant (N) = 6.022 × 10²³


Q4: Atomic mass of Na is 23u. What is the mass of 1 mole of Na atoms? Is there any name for this?

Answer: 23g. It is also called the molar mass of Na atoms.



Q5: Atomic mass of oxygen(O) is 16u. What's its molar mass?

Answer: 16g.



Q6: What is the molecular mass of Water molecule (H₂O)?

Answer: Atomic mass of H = 1u
The atomic mass of O = 16u

The molecular mass of H₂O = mass of 2 atoms of H + mass of 1 atom of O
= 2 × 1u + 16u
= 18u



Q7: What is the molar or gram molecular mass of water?

Answer: Molecular mass of Water (H₂O) = 18u
Gram molecular mass = 18g or 18 grams



Q8: How many moles will be in 45g of water(H₂O)?

Answer: Molecular mass of H₂O = 18u
Mass of 1 mole of H₂O = 18g
No. of moles in 45g of H₂O = 45 ÷ 18 = 2.5 moles



Q9: How many atoms of Hydrogen are there in 2 moles of water?

Answer: 1 molecule of H₂O has H-atoms = 2 atoms
1 mole of H₂O has H-atoms = 2-mole atoms
2 moles of H₂O has H-atoms = 2 × 2 = 4 moles of atoms
= 4 × 6.022 × 10²³
= 24.088 × 10²³
= 2.4088 × 10²⁴ H-atoms


Q10: How many grams of SiO₂ are present in 0.8 mol? (molecular mass of SiO₂ = 60.1u)

Answer: Molecular mass of SiO₂ = 60.1u
1 mole of SiO₂ = 60.1g
0.8 mol of SiO₂ = 60.1 × 0.8 = 48.1g



Q11: Under standard temperature pressure conditions, what is the volume of 1 mol of gas?

Answer: 22.4 litres or 22.4l


Q12: How many mol of CO₂ (carbon dioxide) are present in 55.5 L ?

Answer: 1 mol of CO₂ = 22.4 l
55.5 litres contains = 55.5/22.4
= 2.48 mol of CO₂


Q13: What will be the mass of 12.044 × 10²³ molecules of O₂?

Answer: Molecular mass of O₂ = 2 × 16u = 32u
∴ 1 mol of O₂ = 32g
⇒ 6.022 × 10²³ O₂ molecules have mass = 32g
  12.044 × 10²³ molecules of O₂ = 32 × 12.044 × 10²³ / (6.022 × 10²³)
  = 32 × 2
  = 64g


Q14: Calculate the mass of glucose in 2 × 10²⁴ molecules. Molecular mass glucouse is 180u

Answer: Molecular mass of glucouse = 180u
Gram molecular mass of glucouse = 180g
⇒ 1 mole (6.022 × 10²³) molecules = 180g
2 × 10²⁴ molecules will have mass = 180 × 2 × 10²⁴ / (6.022 × 10²³)
= 180 × 2 × 10 / 6.022 = 597.7 g


Q15: Write formula to calculate Number of moles 

(a) of monoatomic substance, if its mass is given
(b) of a molecular substance, if its mass is given
(c) of a monoatomic substance, if number of atoms are given
(d) of a molecular substance, if number of molecules are given


Answer:
(a)

No. of moles =	mass
	atomic mass

(b)

No. of moles =	mass
	molecular mass

(c)

No. of moles =	no. of atoms
	6.022 × 10²³

(d)

No. of moles =	no. of molecules
	6.022 × 10²³

CBSE Class 9 - कक्षा ९ - Hindi(B) हिंदी (ब) - कविता - नए इलाके में (प्रश्नोत्तर )

कविता - नए इलाके में 

कक्षा ९ - Hindi(B) हिंदी (ब) 

प्रश्नोत्तर 

प्र १: नए बसते इलाके में कवि रास्ता क्यों भूल जाता है ?

उत्तर : नव निर्माण ही  कवि का रास्ता भूलना मुख्य कारण है । इसके अतिरिक्त अन्य कारण है :
१. नित्य नए मकान बनना
२. नए इलाकों का बसना
३. बनाए गए निशानों का न मिलना
४. नए परिवर्तन से कवि का दिशा भ्रमित हो जाना


प्र २ : कविता में कौन कौन से पुराने निशानों का उल्लेख किया गया है ?

उत्तर : कविता में निम्नलिखित पुराने निशानों का उल्लेख किया गया है :
(क) पीपल का पुराना  पेड़
(ख) ढहा हुआ मकान
(ग) खाली जंमीन का टुकड़ा
(घ) बिना रंग वाले लोहे के फाटक का एक मंजिला घर


प्र ३: 'नए इलाके में' कविता के रचियता का नाम लिखिए ?

उत्तर : अरुण कमल

CHAPTER REVISION TEST - CLASS XI - PHYSICS (Work, Energy and Power) (#cbsenotes)

Work, Energy and Power

CHAPTER REVISION TEST 

CLASS XI - PHYSICS 

Q1: When an air bubble rises in water, what happens to its potential energy? [1]

Q2: A spring is cut into two equal halves. How is the spring constant of each half affected? [1]

Q3: What should be the angle between the force and the displacement for maximum and minimum work? [1]

Q4: The momentum of an object is doubled. How does it’s. K.E. change? [1]

Q5: What is work done in holding a 15kg suitcase while waiting for a bus for 15 minutes?  [1]

CBSE Class 10 - हिंदी (ब)/ Hindi(B) Marking Scheme (नमूना उत्तर पत्र ) of SA2 Sample Question Paper (2016-17) (#cbsepapers)

CBSE Class 10 - हिंदी (ब)/ Hindi(B) Marking Scheme (नमूना उत्तर पत्र ) of SA2 Sample Question Paper (2016-17)

☛See Hindi (B) SA2 Sample Question Paper (2016-17)

CBSE Class 10 - हिंदी (ब) / Hindi(B) Sample Question Paper (2016-17)

CBSE Class 10 - हिंदी (ब)/ Hindi(B) Sample Question Paper (2016-17)

☛See Hindi (B) SA2 Marking Scheme Of Sample Question Paper (2016-17)

CBSE Class 10 - NTSE Stage-1 Language Test-2 (#ntse)(#englishquiz)(#cbsenotes)

NTSE Stage-1 Language Test-2

Direction: in question Nos. 1 – 6, Choose the alternative which expresses the meaning of the given idioms/phrases.


Q1: Once in a blue moon

(a) every month
(b) always
(c) rarely
(d) after mid night



Q2: Keep body and soul together

(a) to maintain life
(b) to be free from disease
(c) to live in a joint family
(d) to have fun in life

GGS INDRAPRASTHA UNIVERSITY Common Entrance Test for Graduate Courses (2017-18)

GGS INDRAPRASTHA UNIVERSITY, DELHI Applications Invited for Common Entrance Test for Graduate Courses

Guru Gobind Singh Indraprastha University, Delhi has commenced Admission process for 2017-18. You may apply for Common Entrance Test (CET) for various graduate courses.

Important Courses are listed below:

Sl.No	CET Name	CET Code	Last Date of Application (UPTO 4 PM)	CET Date	CET Time	Date of Declaration of Result (Latest by)
1.	BTECH	131	4th April, 2017 Tuesday	23rd April, 2017 Sunday	2.00 PM to 4.30 PM	9th May, 2017 Tuesday
2.	BJMC	126	4th April, 2017 Tuesday	29th April, 2017 Saturday	2 PM to 4.30 PM	16th May, 2017 Tuesday

CBSE Class 12 - Maths Sample Question Paper with Marking Scheme (2016-17)(#cbsepapers)

CBSE Class 12 - Maths Sample Question Paper with Marking Scheme (2016-17)

CBSE Class 7 - Maths (SA2) Sample Question Paper (2016-17)

CBSE Class 7 - Maths (SA2) Sample Question Paper (2016-17)

CBSE Class 11/12/NEET/AIPMT Plants Of Interests Having Specific Features (#neet)(class11biology)(#biologyquiz)(#cbsenotes)

Plants Of Interests Having Specific Features

Plants Of Special Interests
(image credits: wikipedia)

Very Short Q & A


Q1: Name the largest Angiosperm.

Answer: Eucalyptus sps.


Q2: Name the smallest Angiosperm.

Answer: Lemma


Q3: Name the Largest seed.

Answer: Lodoicea


Q4: Which plant has the largest leaf?

Answer: Victoria amazonica


Q5: Name the biggest orchid.

Answer: Grammato phyllum speciosum

CBSE Class 6 - Geography - CH 7 - Our Country India (#cbsenotes)(#NCERTAnswers)

Our Country India

Q & A based on NCERT Class 6 Geography - Chapter  7  


Q1: Define peninsula

Answer: It is a piece of land that is surrounded by water on three sides. e.g. India


Q2: What are the geographical boundaries of India?

Answer: In the north it is bounded by lofty Himalayas, the Arabian sea in the west, the Bay of Bengal in the east and the India ocean in the south.


Q3(NCERT): Name the major physical divisions of India.

Answer: The major physical divisions of India are:
• The Great Himalayas or Himadri
• The Northern Great Plains
• The Coastal Plains
• The Peninsular Plains
• The Islands


Q4: Name the the second most populous country of the world

CBSE Class 10 - Marking Scheme Of SA2 Science Sample Question Paper (2016-17)(#cbsepapers)

CBSE Class 10 - Marking Scheme Of (SA2) Science Sample Question Paper (2016-17)

☛See Science Sample Question Paper (2016-17)

CBSE Class 8 - SA2 Maths Sample Question Paper (2016-17) (#cbsepapers)

CBSE Class 8 - SA2 Maths Sample Question Paper (2016-17)

CBSE Class 8 - Maths - CH3 - Understanding Quadrilaterals (Worksheet) (#cbsenotes)

Understanding Quadrilaterals

(Worksheet)

The worksheet helps you identify a specific quadrilateral based on its properties.

☛Directions: Fill in the blanks

① A simple closed curve made up of only line segments is called a ________.
 


② A _________ of a polygon is a line segment connecting two non- consecutive vertices.
 


③ A _______ _______ is a polygon in which no portion of its any diagonal is in its exterior.
 


④ A quadrilateral is a polygon having only ________ sides.
 

CBSE Class 10 - Science Sample Question Paper (2016-17) (#cbsepapers)(#cbsenotes)

CBSE Class 10 - Science Sample Question Paper (2016-17)

☛See also Marking Scheme of SA2 Science Sample Question Paper (2016-17)

CBSE Class 10: NTSE Stage 1 - English Language Test

English Language Test

Delhi NTSE Stage 1 (2015-16)

☛Direction: Choose the word that is opposite in meaning to the given words in question Nos. 1 – 6

Q1: Collision

(a) Compassion
(b) Agreement
(c) Perfection
(d) Conflict




Q2: Grudge

(a) modest
(b) hatred
(c) affection
(d) eternal



Q3: Insolvent

(a) alluring
(b) irrational
(c) defaulter
(d) affluent

CBSE Class 12 - Accountancy Sample Question Paper with Answers (2016-17) (#cbsepapers)

CBSE Class 12 - Accountancy Sample Question Paper with Answers  (2016-17)