CBSE Class 10 - Maths - Arithmetic Progressions ( Questions and Answers)

Arithmetic Progressions

Class 10 NCERT Exemplar Chapter Solutions

Q 1(MCQ): In an AP, if d=-4,a_n=7 and a_n=4, then a is equal to

(a) 6

(b) 7

(c) 20

(d) 28

Answer: (d) In an AP, a_n=a+(n-1)d
⇒ 4=a+(7-1) (-4)
⇒ 4=a+6(-4)
⇒ 4+24=a
∴ a=28


Q 2(mcq): In an AP, if a=3.5,d=0 and n=101, then a_n will be
(a) 0

(b) 3.5

(c) 103.5

(d) 104.5

Answer: (b) 3.5
For an AP, a_n =a+(n-1)d=3.5+(101-1)×0
∴ =3.5


Q 3(mcq): The list of numbers are -10,-6,-2,2,.... is

(a) an AP with d=-16

(b) an AP with d=4

(c) an AP with d=-4

(d) not an AP

Answer: (b) The given numbers are -10,-6,-2,2...is
Here, a₁ = -10,
          a₂ = -6,
          a₃ = -2
    and a₄ =2...

Since, a₂ - a₁ = -6-(-10)

           = -6+10=4

   a₃-a₂= -2-(-6)

           =-2+6=4

   a₄-a₃=2-(-2)
            =2+2=4
Each successive term of given list has the same difference i.e.,4.
So, the given list forms an AP with common difference, d=4.


Q 4(mcq): The first four terms of an AP whose first term is -2 and the common difference is -2 are

(a) -2,0,2,4

(b) -2,4,-8,16

(c) -2,-4,-6,-8

(d) -2,-4,-8,-16

Answer: (c) -2,-4,-6,-8
Let the first four terms of an AP are a,a+d,a+2d and a+3d.
Given, that first term, a=-2 and common difference, d=-2, then we have an AP as follows
     -2,-2,-2,-2+2(-2),-2+3(-2)
= -2,-4,-6,-8

CBSE Class 9 - Geography - Natural Vegetation and Wildlife (Q and A)

NATURAL VEGETATION AND WILDLIFE

Munnar Hills (Kerala)

Q & A based on Class 9 NCERT Chapter

Q1: Name the different types of vegetation identified in India.

Answer:  The following major types of vegetation may be identified in India.
 ⅰ Tropical Rain Forests
 ⅱ Tropical Deciduous Forests
 ⅲ Tropical Thorn Forests and Scrubs
 ⅳ Montane Forests
 ⅴ Mangrove Forests


Q2: Mention any three features of the tropical evergreen forests.

Answer:
① These forests are found in the areas of heavy rainfall, i.e., Western Ghats, the Island groups of Lakshadweep, Andaman and Nicobar, upper parts of Assam and Tamil Nadu coast.

②The trees in these forest reach great heights up to 60 metres or even above.

③ As such, these forests appear green all the year round. It is because there is no definite time for trees to shed their leaves.


Q3: Why is natural vegetation in large part of India no more natural?

5 Things Parents Must Take Care While Meeting School Authorities

5 Things Parents Must Take Care While Meeting School Authorities

Here is the info-graphic listing five important points you must take care  while meeting School Authorities. Be it admission interaction or interview or parent teachers meeting, school authorities do assess parents and try to find out the parents level of commitment to the child.

CBSE Class 9 - Science -Work Energy and Power - Question Bank

Work Energy and Power

Question Bank

Here is the compilation of questions asked in CBSE Examination papers in last five years.



Q1: Is it possible that a body is displaced and yet its work is done is zero? If yes write an example?

Q2: If the net work done on a particle is zero, is it possible the particle has uniform speed? How?

Q3: A body is moving on a straight road against a frictional force of 5N. After travelling a distance of 1.5 km he forgot to take the correct path at a roundabout of radius 100m. He moves the circular path of 1½ cycles then he moves forward up to 2km. Calculate the work done by him.

Q4: A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force. Let us take it that the force acts on the object through displacement. What is the work done in this case?
Q5: When do we say that work is done?

Q6: Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Q7: Define 1J of work.

Q8: A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

Q9: What is the kinetic energy of an object?

Q10: Write an expression for the kinetic energy of an object?

CBSE Class 9/10 - ENGLISH GRAMMAR - CLOZE TEST-3

CLOZE TEST-3

ENGLISH GRAMMAR

Directions: In the following passage there are blanks, each of which has been numbered. These numbers are printed below the passage and against each, five words are suggested, one of which fits the blank appropriately. Find out the appropriate word in each case.

(✍Following Passage appeared in Indian Bank PO Exam 2010)

Passage

The World Diabetes Congress has determined that India has the largest number of diabetics in the world. Apart from the loss of productivity, the …(1)… burden is alarming – $ 2.8 billion annually. Sedentary jobs, …(2)… of electronic entertainment, changing diet patterns and …(3)… dependence on automobiles have driven the activity …(4)… of Indians’ lives especially in cities.

The …(5)… is, therefore, to make people physically …(6)… and requires interventions which impact a large …(7)… of the population. Admittedly physical activity is a …(8)… of choice and is strongly driven by …(9)… preferences. But policy making needs to shift to …(10)… moderate levels of physical activity in the daily lives of people. One way to accomplish this is to create walk-able communities that give residents a variety of destinations within walking distance.


1.
(A) economic
(B) finance
(C) subsidy
(D) physical
(E) health

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

WATER

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.

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

Prepositions

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.

① Simple Prepositions
② Compound Prepositions
③ Double Prepositions
④ Participle Prepositions
⑤ Phrase Prepositions