Monday, December 5, 2016

CBSE Class 7 - Geography - Ch5 - Water (Short Q and A)

WATER


CBSE Class 7 - Geography - Ch5 - Water (Short Q and A)
image credits: wikimedia commons

Short Q & A based on NCERT Chapter


Q1: What is precipitation?

Answer: The condensation of water vapour in the form of water droplets or ice-crystals and its falling on the earth’s surface is known as precipitation.


Q2: Define glacier.

Answer: The moving mass of ice is called glacier.


Q3: What is the taste of sea water?

Answer: The taste of sea water is salty.


Q4: Why is sea water saline?

Answer: Sea water is saline due to the dissolution of large amount of salt in it.


Sunday, December 4, 2016

CBSE Class 8/9/10 - English Grammar - Forms of Preposition

Prepositions

CBSE Class 8/9/10 - English Grammar - Forms of Preposition

Prepositions are words which show the relationship between two words in a sentence.

The relationship can include
- direction,
- place (or a particular point or location),
- time,
- manner,
- cause and
- amount (or degree).

☛Note: The preposition is almost always before the noun or pronoun and hence it is called a preposition.

FIVE FORMS OF PREPOSITION

There are five forms of prepositions i.e.

Simple Prepositions
Compound Prepositions
Double Prepositions
Participle Prepositions
Phrase Prepositions

CBSE Class 11/AIPMT - Plant Nutrition (MCQs)

Plant Nutrition

Biology Quiz
CBSE Class 11/AIPMT - Plant Nutrition (MCQs)
Azolla - an aquatic fern has Nitrogen Fixing capability

MCQs for AIPMT/CEET/Pre Medical


Q1: Nitrifying bacteria converts

(a) atmospheric nitrogen into soluble forms
(b) convert ammonia to nitrate
(c) ammonia to nitrogen
(d) nitrate to nitrogen.


Q2: Amino acids are mostly synthesized from

(a) mineral acids
(b) fatty acids
(c) volatile acids
(d) alpha-ketoglutaric acid


Q3: Which of the following is a micro-nutrient for plants?

(a) Pottassium
(b) Iron
(c) Iodine
(d) Zinc


Q4: If a plant’s younger leaves are yellowing but older one remains green, what could be the most probable cause of plant’s blight?

(a) Improper sunlight
(b) Lack of nitrogen fixing bacteria in soil
(c) Deficiency of immobile mineral nutrient
(d) Deficiency of mobile mineral nutrient


Q5: Enzyme involved in nitrogen assimilation is ___________.

Saturday, December 3, 2016

CBSE Class 9 - Science - Work Power and Energy (ENERGY TRANSFORMATIONS) - Worksheet

ENERGY TRANSFORMATIONS

CBSE Class 9 - Science - Work Power and Energy (ENERGY TRANSFORMATIONS) - Worksheet


Worksheet

Give examples for the following scenarios of energy transformations. You may choose the answer(s) from the following list of words

solar cell, turbine, mixer, fan, steam engine, automobiles, green plants, nuclear reactor, electric bulb, torch, electric bulb, microphone, loudspeaker, geyser, heater, car battery, inverter, LPG


SNo.    Energy Transformation
From ⟶ To
     Give Example
1. Mechanical ⟶ Electrical          _________
2. Electrical ⟶ Mechanical      _________
3. Electrical ⟶ Heat      _________
4. Heat ⟶ Mechanical      _________
5. Electrical ⟶ Light      _________
6. Electrical ⟶ Sound      _________

Friday, December 2, 2016

CBSE Class 8 Maths - Linear Equations In One Variable (Q and A)

Linear Equations In One Variable

Class 8

Q & A based on Class 8 NCERT Chapter 

CBSE Class 8 Maths - Linear Equations In One Variable (Q and A)


Q1(MCQ): If 3x – 4 (64 – x) = 10, then the value of x is

(a) –266
(b) 133
(c) 66.5
(d) 38



Answer: (d)38
  3x - 256 + 4x =10
  7x = 10 + 256 = 266
  x = 266/7 = 38


Q2: Three consecutive even numbers whose sum is 156 are 51, 52 and 53.
State if the above statement is True or False

Answer: False

Let the three consecutive even numbers be x, x+2, x+4
∴ x + x+ 2 + x+4 = 156
⇒ 3x + 6 = 156
⇒ 3x = 156 - 6 = 150
⇒ x = 150 /  3 = 50
Thus numbers are 50, 51, 52


Q3: Fifteen added to thrice a whole number gives 93. The number is __________.

Answer: 26



Q4: x = –12 is the solution of the linear equation 5x –3(2x + 1) = 21+x (True or False)


Thursday, December 1, 2016

CBSE Class 9 - Maths - Quadrilaterals (Questions and Answers)

Quadrilaterals 

CBSE Class 9 - Maths - Quadrilaterals (Questions and Answers)


Class 9 NCERT Exemplar Problems and Solutions

Question 1: If angles A,B,C and D of a quadrilateral ABCD, taken in order, are in the ratio 3:7:6:4 then ABCD is a trapezium. Is this statement true? Give reason for your answer.

Solution: Since, the angles are in the ratio 3:7:6:4,

Let these angles be 3x,7x,6x and 4x.

∵Since sum of angles of a quadrilateral is 360°,

∴3x+7x+6x+4x=360°

⇒ 20x=360°

⇒x=18°

∴The angles are:
   ∠A=3×18°=54°,
  ∠B=7×18°=126°,
  ∠C=6×18°=108° and
 ∠D=4×18°=72°

Since ∠A+∠B=54°+126°=180°. Thus, the sum of co-interior angles is 180°formed by lines AD,BC and transversal AB, ∴, AD∥BC.

So,ABCD is a trapezium.

Hence, the given statement is true.

CBSE Class 6-10 - English Grammar - Error Correction - Subject-Verb Agreement

Error Correction - Subject-Verb Agreement

English Grammar


CBSE Class 6-10 - English Grammar - Error Correction - Subject-Verb Agreement


The verb in a sentence has to agree with the number of the subject.

Rule 1: A singular subject takes a singular verb.
e.g.

A girl _______ (dance/dances) beautifully.  [Answer: dances]

This article _________ (has/have) three paragraphs.  [Answer: has]


Rule 2: A plural subject takes a plural verb.

e.g.

Those girls __________ (dance/dances) beautifully.   [Answer: dance]

These articles _________ (has/have) single paragraph only.  [Answer: have]


Rule 3: If two singular nouns are joined by 'and' and used as the subject, it takes plural verb.

e.g.
Mohan and Sudama  _________ (was/were) fast friends.   [Answer: were]

He and I _________(am/are) going to welcome them. [Answer: are]


Exceptions: Words used in pairs like 'bread and butter', 'bag and baggage' are considered singular and take singular verbs.

e.g. Blogging ______ (is/are) my bread and butter now.