• Male, 41 Years
• Activity Score1200

## Aritra D

Associated for 4 Years 5 Months
English, Mathematics and Science Tutor for ICSE and CBSE
• I go to Student's Home
• Online
• Qualification:
M.Phil, M.A, B.A, 12th, 10th
• Experience:
Almost 16 years of teaching English, Maths and Science as a Tutor (face-to-face) and 8 years as a Professor of English (both Regular and Distance). I am also an author for English and Science books.
• Teaches:
Physics, Mathematics, English, BA Tuition, SSC Exams, SSB Exam, NDA, LIC, UGC Net, TET, SET, NET
• Board:
CBSE/ISC
• Areas:
• Pincode:
700028
Profile Details

#### Qualification :

 M.Phil Rabindra Bharati University - [RBU], Kolkata 2010 M.A Rabindra Bharati University - [RBU], Kolkata 2005 B.A BB College, Asansol 2003 12th BB College, Asansol 2000 10th St. Patrick's HS School, Asansol 1998

#### Total Experience :

21 Years

Almost 16 years of teaching English, Maths and Science as a Tutor (face-to-face) and 8 years as a Professor of English (both Regular and Distance). I am also an author for English and Science books.

#### Tutoring Option:

I Can Manage Both

#### Tutoring Approach:

My approach is simple. First, I explain the context and then provide relevant and necessary information. Also, I guide my students to write to-the-point and brief answers.

#### Hourly Fees [INR]:

200.00

 Class 11 - 12 Mathematics, Physics, English, CBSE/ISC INR 150.00 /hour College Level English, BA Tuition INR 200.00 /hour Test Preparation NET, TET, SET, UGC Net INR 300.00 /hour Competitive Exams SSC Exams, SSB Exam, NDA, LIC INR 250.00 /hour
Educational Resources

## Notes written by me [19]

##### Comparison Of Quantities
• File(s) contain : 1

Mathematical topics like: 1. Percentage 2. Comparison 3. Profit and Loss 4. Simple Interest

##### Notes On English Literature Practice
• File(s) contain : 5

This notes will help students to practice English Literature and obtain good marks.

##### Notes On English Lesson For Practice
• File(s) contain : 4

The students who wants to get good marks in their exam, this practice lesson will help them a lot.

##### Practice Notes On English Literature
• File(s) contain : 10

The Notes that will help students to preapare their English Literature for their Board Exam.

##### English Literature Notes For Class 12
• File(s) contain : 10

By take through Notes, the students will get knowledge how to write a Journal and prepare them accordingly.

##### Notes On English Words And Meaning
• File(s) contain : 10

The Notes will help student to know the meaning of the words and how to use them.

##### Heat Transfer
• File(s) contain : 1

Physics for Class 8 for ICSE and CBSE.

##### Light
• File(s) contain : 1

Physics for Class 8 for ICSE and CBSE students.

##### Energy
• File(s) contain : 1

Physics for Class 8 for ICSE and CBSE students.

##### Force And Pressure
• File(s) contain : 1

Physics for Class 8 ICSE and CBSE students.

##### Matter
• File(s) contain : 1

Physics for Class 8 students of ICSE and CBSE.

##### Competitive
• File(s) contain : 1

SSC-CGL

##### Gravitation
• File(s) contain : 1

Physics: For CBSE and ICSE Students.

##### Determinants
• File(s) contain : 1

Mathematics: For ICSE and CBSE Students.

##### Gravitation
• File(s) contain : 1

Physics of ICSE and CBSE board for Class 9 and 10 students.

##### English Literature
• File(s) contain : 1

M.Phil Dissertation on Beat Literature.

##### English Literature
• File(s) contain : 1

Study Material on English Literature.

##### English Literature
• File(s) contain : 3

Study Notes for BA and MA students of English Literature.

##### Literature For MA Students
• File(s) contain : 1

Study Notes for Students pursuing English Literature at BA and MA level.

• ## Question: There are two circles. AB is diameter of the largest circle, P and Q are centres...

Posted in: Mathematics | Date: 14/09/2017

Given, AB is the diameter of the larger circle.

P and Q are the Centres of the smaller circles.

M is the point where the circles with centres P and Q touch each other.

So, AB = AM + MB     ----------------------------- (i)

Thus, AM is the diameter of the circle with centre P

So, AM = AP + PM

= PM + PM (AP = PM, both being radii of the circle with centre P)

= 2PM ----------------------------- (ii)

And MB is the diameter of the circle with centre Q

So, MB = MQ + QB

= MQ + MQ (MQ = QB, both being radii of the circle with centre Q)

= 2MQ ----------------------------- (iii)

From (i), AB = AM + MB

= 2PM + 2MQ (from ii and iii)

AB = 2(PM + MQ)

or, PM + MQ = AB/2

or, MQ = AB/2 - PM

= (AB - 2PM)/2

• ## Question: A mixture of 25 kg of spirit and water contains 20% water. How much water must b...

Posted in: Mathematics | Date: 27/09/2017

Total weight of mixture = 25 kg Total weight of water = 20% of 25 kg = 5 kg. Now, 20% weight = 5 kg Let the extra amount of water be 'x' kg. Thus, (5+x)/(25+x)×100 = 33.33 Or, 500 + 100x = 33.33x + 833.35 Or, (100 - 33.33)x = 833.35 - 500 Or, 66.67x = 333.35 Or x = 5 kg. So, the weight of water required to be added = 5 kg.

• ## Question: The ratio of males to females in a village is 3 : 2. 20% of the males and 25% of...

Posted in: Mathematics | Date: 27/09/2017

Let the total population be 'x'. Now, males:females = 3:2 Sum of ratios = 3+2 = 5 So, males = 3x/5 And females = 2x/5. No. Of male graduates = 20% of 3x/5 = (20/100)(3x/5) = 3x/25 No. Of female graduates = 25% of 2x/5 = (25/100)(2x/5) = x/10 Thus, no. Of graduates = 3x/25 + x/10 = 11x/50. Thus, no. Of non-graduates = x - 11×/50 = 39x/50 Hence, percentage of non-graduates = (39x/50)/(x)×100 = 39×2 = 78% So, the correct answer is Option D.

• ## Question: Out of 15 marbles in a bag, 5 are white. If we add some more white marbles in th...

Posted in: Mathematics | Date: 17/10/2017

The No. of marbles kept originally = 15

no. of white marbles = 5

Thus, fraction of white marbles = 5/15 = 1/3

Let the number of white marbles added be 'x'.

Thus, (5+x)/(15+x) = 3/5

or, 5(5 + x) = 3(15 + x)

or, 25 + 5x = 45 + 3x

or, 5x - 3x = 45 - 25

or, 2x = 20

or, x = 10.

So, the correct option is (D).

• ## Question: In an acute angled triangle ABC as shown in the figure, AM is the median on BC a...

Posted in: Mathematics | Date: 17/10/2017

There are mistakes and missing informations in the question. Where is M? Are you sure that it is AM and not AD? Also, isn't <CAB = 90 degrees?

• ## Question: In the given figure, a sphere completely fits into a cylinder. What is the ...

Posted in: Mathematics | Date: 18/10/2017

Surface Area of a Sphere = 4πr^2

Curved Surface Area of Cylinder = 2πrh

Thus, ratio of Surface Area of a Sphere : Curved Surface Area of Cylinder = 4πr2 : 2πrh

= 2r : h

= d : h

So, the correct option is (A).

• ## Question: In the following figure, ABC is an isosceles triangle such that PQ = PR. Having ...

Posted in: Mathematics | Date: 07/11/2017

Option B. OM = 2 cm and OQ = 7 cm

• ## Question: If mode of the given data is 2, what is the value of x + y? 1, 2, 5, 5, ...

Posted in: Mathematics | Date: 07/11/2017

Given, Mode = 2

So, 3x - 10 = 2

or, 3x = 10 + 2

or 3x = 12

or, x = 4

And 4y + 6 = 2

or, 4y = 2 - 6

or, 4y = - 4

or, y = - 1

Thus, x + y = 4 - 1 = 3

So, the correct option is B.

• ## Question: Mean of a and b is 9. If c = 5a - 4, what is the mean of b and c?

Posted in: Mathematics | Date: 07/11/2017

Given, (a + b)/2 = 9

Thus, a = 18 - b

And, b = 18 - a

Also, c = 5a - 4

Thus, c = 5(18 - b) - 4

= 90 - 5b - 4

= 86 - 5b

So, (b + c)/2 = (b + 86 - 5b)/2

= (86 - 4b)/2

= 43 - 2b

= 43 - 2(18 - a)

= 43 - 36 + 2a

= 7 + 2a

So, Option C is correct.

• ## Question: Help me to find the median of even numbers between 21 and 43.

Posted in: Mathematics | Date: 07/11/2017

Even numbers between 21 and 43 are:

22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42

Thus, Median = 6th number

= 32

So the correct option is B.

• ## Question: Help me to find the median and mode of the following data: 4, 14, 10, 7, 5,...

Posted in: Mathematics | Date: 07/11/2017

Re-arrenging the series:

1, 2, 4, 5, 7, 8, 10, 10, 12, 14, 15

Since, the series has 11 numbers, so the Median will be the 6th number = 8

And as 10 is the most repeated number so the Mode = 10

Hence, Option A is the correct answer.

• ## Question: Two congruent circles intersect at P and Q as shown in the figure. If their cent...

Posted in: Mathematics | Date: 08/11/2017

Correct option is (B).

Working shown in the attached file.

• ## Question: The angles of elevations of a tower PQ from two points on the ground A and B are...

Posted in: Mathematics | Date: 22/11/2017

The question is erroneous. Instead of <QAB = 90, it should be <PQB = <PQA = 90

• ## Question: Two boys of same height h are flying kites from a ground. The distance between t...

Posted in: Mathematics | Date: 23/11/2017

The solution is provided in the attachment.

• ## Question: A pole of length ‘L’, leaning on the wall makes an angle x. When the...

Posted in: Mathematics | Date: 23/11/2017

Please check the attachment for the solution.

• ## Question: A vertical building and a tower are on the same ground level. From the top of th...

Posted in: Mathematics | Date: 23/11/2017

Option C

• ## Question: A point on the pole divides in a certain ratio. Both the parts subtend equal ang...

Posted in: Mathematics | Date: 23/11/2017

Option D

• ## Question: Surf gave 25% of her monthly salary to her mother. From the remaining salary, sh...

Posted in: Mathematics | Date: 12/12/2017

Let the monthly salary be R 100.

Money given to mother = R 25

Money remaining = R 75

Money paid for rent = R 11.25

Money kept aside for monthly expenses = R 18.75

Thus, money kept in bank = R [100 – (25 + 11.25 + 18.75)]

= R [100 – 55]

= R 45

Sum of amount given to mother and amount kept in bank = R [25 + 45] = R 70

When assumed sum is R 70, then actual sum is R 42000

So, when assumed sum is R 100, then actual sum is R 60000

• ## Question: A car covers the first 39 km of its journey in 45 minutes and the remaining 25 k...

Posted in: Mathematics | Date: 02/01/2018

Speed of car in the 1st part of the journey = 39(45/60) km/hr = 52 km/hr

Speed of car in the 2nd part of the journey =  25 (35/60) km/hr = 300/7 km/hr = 42.85 km/hr

Average speed = (52 + 42.85)/2 km/hr = (94.85)/2 km/hr = 47.43 km/hr

So, the correct answer is E (None of the above).

• ## Question: A, B and C entered into a partnership by investing Rs.64,000, Rs.52,000 and Rs.3...

Posted in: Mathematics | Date: 02/01/2018

Let the duration of the investment be ‘t’ and let the annual profits be divided proportionately by each.

Also, let the total profits be ‘x’.

So, A = R 64000; B = R 52000; C = R 36000

Hence, A:B:C = 64:52:36 = 16:12:9

Hence, the profit shares = 16x : 12x : 9x

If 16x = 35584

And 9x = (9 x 35584)/16 = R 20016

So, C’s share of the annual profits = R 20016

So, the correct option is E.

• ## Question: Solve the differential equation: $xdy-ydx+y^2dx=0$

Posted in: Mathematics | Date: 09/01/2018

The solution is worked out in the attached document.

• ## Question: Find the dimensions of the right circular cone of minimum volume that can be cir...

Posted in: Mathematics | Date: 09/01/2018

Hence, from the derivation in the attachment,

h = 4a

or h = 4(8) where a = 8

or h = 32 cm

and r = 8root2

• ## Question: The price of a bike is increased by 25%, by how much percent, must the new ...

Posted in: Mathematics | Date: 17/01/2018

Let the price of the bike be R 100.

Thus, increased price = 25%   of R100 = R125

Now, decrease in % of price with respect to the new price = (25/125) x 100 = 20%

• ## Question: Rohan multiplied a number by 2/3 instead of 3/2 what is the percentage error in ...

Posted in: Mathematics | Date: 17/01/2018

Let the number be ‘x’.

Therefore the new number = 2x/3

And the actual new number = 3x/2

Difference = (3x/2 – 2x/3) = (9x – 4x)/6 = 5x/6

Thus, percentage error in calculation = (5x/6)/(3x/2) x 100 = (10x/18x) x 100 = 1000/18 = 55.56%

• ## Question: Find the original fraction if in a fraction, the numerator is increased by 25% a...

Posted in: Mathematics | Date: 17/01/2018

Let the original fraction be x/y

Now, x + 25% of x = 5

Or, x + 25x/100 = 5

Or, 5x/4 = 5

Or, x = 4

And, y – 10% of y = 9

Or, y – 10y/100 = 9

Or, 9y/10 = 9

Or, y = 10

Thus, x/y = 4/10 = 2/5

• ## Question: The ratio between the time taken by three cars (A, B and C) that travel the same...

Posted in: Mathematics | Date: 17/01/2018

Let the distance to be covered be x km

Ratio of time taken:

A:B:C =  12:15:10

Sum of ratios = 12 + 15 + 10 = 37

Speed of A = 60 km/hr

Thus, 12x/37 = 60

Or, x/37 = 5

Or, x = 5(37) = 185

Hence, Speed of B = 15(185)/37 = 75 km/hr

• ## Question: The charges per hour playing game is increased by 25% then find the percentage d...

Posted in: Mathematics | Date: 17/01/2018

Let the charges per hour be R 100

Thus, increase in charges = 25% of 100

So, new charges = R 125

Let the time taken to play a game be ‘T’ hr

Thus, the decreased time = t hr

Now, actual expenditure = R 110

So, 125t = 100T + 10T

Or, 125t = 110T

Or, t = 22T/25

Now, decrease in time = T – t = T – 22T/25 = 3T/25

And % decrease = [(3T/25)/T]100 = 12%

• ## Question: What will come in place of question mark in the following question? (4356)1/2...

Posted in: Mathematics | Date: 17/01/2018

[(4356)/2]/(11/4) = 792

792/6 = 132

So, 132 x 132 = √17424

so, ? = 17424

• ## Question: What is the centre of the circle (x − 5)$^2$ + (y − 7)$^2$ = 64 ...

Posted in: Mathematics | Date: 22/03/2018

centre = (5, 7)

• ## Question: What is the centre of the circle x$^2$ + y$^2$ + 4x + 8y − 45 = 0 ?

Posted in: Mathematics | Date: 22/03/2018

x2 + y2 + 4x + 8y – 45 = 0

x2 + 4x + y2 + 8y – 45 = 0

or, x2 + 4x + 4 + y2 + 8y + 16 = 25

or, (x + 2)2 + (y + 4)2 = 52

so, centre = (– 2, – 4)

• ## Question: A car moves for half of its time at 80 km/h and for rest of the time at 40 km/h....

Posted in: Physics | Date: 29/05/2018

Let the Time taken be T hr.

So, for T/2, Distance = 80 x T/2

And, for T/2, Distance = 40 x T/2

total distance = 60 = 80T/2 + 40T/2

= 60 = 120 T/2

= 60 = 60T

= 1 hr = T

So, Avg. Speed = 60/1 = 60 km/hr

• ## Question: In a game called "pass the ball" position of some players are as follows: A is ...

Posted in: SSC Exams,RRB,Bank Clerical,Bank PO | Date: 29/05/2018

A

I

I

C ------------------------------------I B

The question is wrong as C cannot be to the West of A. There is some missing data in this case.

• ## Question: Two railway tracks are parallel to west-east direction. Along one track, train A...

Posted in: Physics | Date: 10/07/2018

The Relative Velocity of the ground with respect to Train B is 90 km/hr.

• ## Question: What is relation between °c and °f

Posted in: Physics | Date: 02/09/2018

C/5 = (F-32)/9 where C = Celsius and F = Farenheiht

• ## Question: name three physical quantities without dimension

Posted in: Physics | Date: 02/09/2018

1. Archemedes Number

2. Chandrasekhar Number

3. Decibel

• ## Question: 29r2-10r-10

Posted in: Mathematics | Date: 05/10/2018

R = [–(–10) ± √(100 – 1160)]/2x29 = [100 ± √(– 1060)]/58 = [50 ± √(– 265)]/29 = [50 ± 16.28i]/29

• ## Question: The 1st term and 5th term is -14 and 2 respectively and the sum of its n term is...

Posted in: Mathematics | Date: 05/10/2018

A = - 14

T5 = 2

Now, t5 = a + (n-1)d

2 = – 14 + (5 – 1)d

16 = 4d

D = 4

Sn = n/2[2a – (n – 1)d]

40 = n/2[– 28 – (n – 1)4]

80 = n[- 28 – 4n + 4]

80 = n[- 24 – 4n]

20 = n[6 – n]

n2 – 6n + 20 = 0

n = [–(–6) ± √(36 – 80)]/2 = [6 ± √(– 44)]/2 = [6 ± 2√(– 11)]/2 = 3 ± 1(3.32) = 6.32 or 0.32

• ## Question: The 1st term and 5th term is -14 and 2 respectively and the sum of its n term is...

Posted in: Mathematics | Date: 05/10/2018

A = - 14

T5 = 2

Now, t5 = a + (n-1)d

2 = – 14 + (5 – 1)d

16 = 4d

D = 4

Sn = n/2[2a + (n – 1)d]

40 = n/2[– 28 + (n – 1)4]

80 = n[- 28 + 4n - 4]

80 = n[- 32 + 4n]

20 = n[-8 + n]

n2 – 8n - 20 = 0

n2 - 10 n + 2n - 20 = 0

n(n - 10) + 2(n - 10) = 0

(n - 10)(n + 2) = 0

n = 10 or - 2

As n cannot be negetive, na = 10 isthe correct answer.

• ## Question: The age of Mr. Mohan is four times the age of his son. After ten years the age o...

Posted in: Mathematics | Date: 05/10/2018

Let the age of the son be ‘x’ years.

Thus, Mr. Mohan’s age = 4x years

After 10 years,

Son’s age = x + 10 years

Mr. Mohan’s age = 4x + 10

Now, 2(x + 10) = 4x + 10

Or 2x + 20 = 4x + 10

Or 2x = 10

Or x = 5 years

• ## Question: Which invisible ray is used to know the structure of crystal?

Posted in: Physics | Date: 18/10/2018

X-ray

• ## Question: When we shoot from the gun we fall backward. Why? Give reason

Posted in: Physics | Date: 18/10/2018

Newton's third law of motion states that 'for every action there is an equal and opposite reaction'. When a gun is being shot, there are forces acting within it to make the bullet move forward and out. These forces are in the form of the kinetic energy of the bullet and the potential energy that is tored in it. When the bullet moves out with the help of the combination of force, acceleration and energy, there is also an equal and opposite combination of foce, energy and acceleration working on it, known as the 'recoil'. This recoil leads us to fall back. This is the same principle that provides 'thrust' to rockets before they can lift off to space.

• ## Question: What are applications of Archimedes principle

Posted in: Physics | Date: 18/10/2018

The Archemedes' principle is used in designing ships, submarines, boats and hydrometers.

Archemedes himself used it to find out the purity of gold.

Fishes use the Archemedes priciple to rise up to the surface of waterbodies or to sink doen to their bottom.

• ## Question: The power of the lens is 0.2D what will be it's focal length

Posted in: Physics | Date: 18/10/2018

Power (D) = 1/Focal Length (F)

or, 0.2 = 1/F

or, F = 1/0.2

= 10/2

= 5 m.

Hence, the options given are wrong.

• ## Question: Define 1newton

Posted in: Physics | Date: 18/10/2018

1 Newton is the measurement of the force exerted when a mass of 1 kg moves with an acceleration of 1 m per second sq.

Hence, 1 N = 1 kg x 1 m/s2

= 1 kgm/s2

• ## Question: Cross product of two vectors is a

Posted in: Physics | Date: 18/10/2018

The vector product of two vectors a and b is given by a vector whose magnitude is given by |a||b|sinθ (where0∘≤θ≤180∘), which stands for the angle between the two vectors. Note that the direction of the resultant vector is denoted by a unit vector ^n whose direction is perpendicular to both the vectors a and b in a way that a, b and ^n are oriented in right-handed system.

Right-handed orientation happens when vector a is twisted in the direction of vector b, then the direction of the unit vector ^n goes in the direction in which a right-handed screw would spin if moved in a similar manner. Also, these given vectors a and b cannot be called null vectors or non-parallel in nature. The right-hand thumb rule gives a clear picture of the direction of the resultant vector.

Therefore, we can conclude that, a×b = |a||b|sinθ ^n, where a×b stands for the cross product of two vectors. In any given situation, if the vectors are null or both the vectors are parallel to each other, then the cross product cannot be defined.

In this case, we can conclude that a×b = 0

Physical Representation

Let’s assume that a and b are the adjacent sides of the parallelogram OACB and the angle between the vectors a and b is θ. Then, we can say that the area of the parallelogram is denoted by |a×b| = |a||b|sinθ.

Properties of Cross Product of Two Vectors

i) The vector product never has a Commutative Property. It is denoted by,

a×b = – (b×a)

ii) The property given below is true in the case of vector multiplication:

(ka)×b= k(a×b) =a×(kb)

iii) If the vectors mentioned are collinear then

a×b= 0

(Since the angle between both the vectors would be 0, then sin 0 = 0)

iv) As per the above property

We can conclude that the vector multiplication of a vector with itself would be a×a= |a||a|sin0 ^n = 0 Also, when it comes to unit vector notation

^j×^j=^j×^j=^k×^k =0

As per the above discussion

^i×^j=^k=−^j×^i

^j×^k=^i=−^k×^j

^k×^i=^j=−^i×^k

This example can be explained better with the help of the following diagram. When moving in clockwise direction and considering the cross product of any two pair of the unit vectors, we can derive the third one and we get the negativeresultant in anticlockwise direction.

v) a × b in terms of unit vectors can be represented as

a =a1^i+a2^j+a3^k

b =b1^i+b2^j+b3^k

Then →a×→b =(a1^i+a2^j+a3^k)(b1^i+b2^j+b3^k)

When expanded, we would get

|a||b|sinθ ^n = (a2b3–a3b2)^i+(a3b1–a1b3)^j+(a1b2–a2b1)^k

vi) Distributive Law: a×(b+c) = a×b+a×c

• ## Question: A uniform rod of mass m and length l makes a constant angle theta with an axis ...

Posted in: Physics | Date: 18/10/2018

Moment of inertia of a rod of length r = 1/3 (mr2)

Given, mass of rod = m, length = l and < of rotation = theta

Let, the radius of the circle of raotation be r.

Thus, r = l cos theta

and I = 1/3 (l cos theta)2

• ## Question: Why does a ray bend when it travel s from one medium into another

Posted in: Physics | Date: 16/12/2018

A ray of light bends when it travels from a optically denser medium to an optically lighter one or vice versa. This phenomenon is known as Refraction of Light.

This change of direction of light is because of the change in the speed of light in different media. Also, the angle at which the ray of light moves from one medium to another, influences the angle of refraction of light. The greater the angle, the greater is the refraction.

• ## Question: The age of Mr. Mohan is four times the age of his son. After ten years the age o...

Posted in: Mathematics | Date: 16/12/2018

Let the age of the son be x years.

Thus, Mohan's age is 4x years.

After 10 years,

Son's age is (x + 10) years

ans Mohan's age is (4x + 10) years

Now, 4x + 10 = 2(x + 10)

Or, 4x + 10 = 2x + 20

Or, 2x = 10

Or, x = 5

So, present age of Mohan's son is 5 years.

• ## Question: The mean of 25 students In a class is 12 if the teachers are included the mean a...

Posted in: Mathematics | Date: 16/12/2018

• ## Question: (-15)+(-6)+3.. find the sum to 30terms

Posted in: Mathematics | Date: 16/12/2018

Given a = - 15; d = 9; n = 30

Thus, S30 = 30/2 [2a + (30 – 1)d]

= 15 [2(–15) + 29(9)]

= 15 [–30 + 261]

= 15[231]

= 3465

• ## Question: A shopkeeper marks his goods 40% above the cost price and allows is customer a d...

Posted in: Mathematics | Date: 16/12/2018

Let the CP = ₹ 100

Thus, MP = ₹ 140

Discount = 10%

So, SP = ₹ 140 - ₹ 14 = ₹ 126

So, Profit = ₹ 26

When Profit = ₹ 26, CP Profit = ₹ 100

When Profit = ₹ 325, CP Profit = ₹ (325 x 100)/26 = ₹ 1250

• ## Question: A shopkeeper marks his goods 40% above the cost price and allows is customer a d...

Posted in: Mathematics | Date: 16/12/2018

Let the CP = ₹ 100

Thus, MP = ₹ 140

Discount = 10%

So, SP = ₹ 140 - ₹ 14 = ₹ 126

So, Profit = ₹ 26

When Profit = ₹ 26, CP = ₹ 100

When Profit = ₹ 325, CP = ₹ (325 x 100)/26 = ₹ 1250

• ## Question: name three physical quantities without dimension

Posted in: Physics | Date: 17/12/2018

Physical quantities having units but no dimensions are: plane angle, angular displacement and solid angle.

• ## Question: A body increases its mass by 10% and velocity by 20% find the net percentage of ...

Posted in: Physics | Date: 17/12/2018

Let mass of the body be ‘m’ and velocity be ‘v’.

So, KE = ½ (mv2)

Now, increase in mass = 10% of m

Thus, new mass = m + m/10 = 11m/10

Increase in velocity = 20% of v

Thus, new velocity = v + v/5 = 6v/5

Hence, new KE = ½[(11m/10)(6v/5)2]

= 198mv2/250

So, increase in KE = 198mv2/250 – mv2/2 = 73mv2/250

Hence, % increase in KE = [(73mv2/250)/(mv2/2)]100 = 58.4%

• ## Question: Answer of these

Posted in: Physics | Date: 17/12/2018

2. (i) Speed may be described as the distance traversed by a body with rerspect to time.

(ii) Instanteneous velocity may be described as the velocity of a body at a certain point of time.

(iii) Velocity may be defined as the displacement of a body or a the ditance covered by it in a particular direction with respect to time.

(iv) Acceleratio is the rate of change of velocity with rspect to time.

• ## Question: Calculate the power of lens whose focal length is 10 mm.

Posted in: Physics | Date: 17/12/2018

Given focal length = 10 mm = 10/1000 m = 1/100 m = 0.01 m

Thus, P = 1/f = 1/0.01 D = 100D

• ## Question: The quantity mass×pressure/density is

Posted in: Physics | Date: 17/12/2018

Pressure = Force/Area = mg/cm2

Density = mass/volume = m/cm3

Thus, m x mg/cm2 x cm3/m = mg cm = mgh = Potential Energy.

Thus, it is the formula for finding Potential Energy.

• ## Question: Three identical spheres each of mass m and radius r are placed touching each oth...

Posted in: Physics | Date: 17/12/2018

Since the bodies are of equal dimension and masses, then the centre of mass will be at the centre of the sphere B where the spheres are arranged as A, B and C respectively. Hence, distance of the Centre of Mass from the centre of A is equal to its diametre as its radius is the same as the radius of sphere B.

• ## Question: When a ball is thrown up vertically with velocity v$_0$, it reaches maximum he...

Posted in: Physics | Date: 17/12/2018

Given, v = v0; u = 0; height = S and acceleration = g

So, v02 = u2 + 2gS

As u = 0,

v02 = 2gS

S = v02/2g

While, tripling the height, the acceleration due to gravity remains the same.

So, 3S = 3 v02/2g

Or, H = 3S

= (√3 v0) 2/2g

Hence, the velocity in case the height is tripled is √3 v0

• ## Question: What is relative density?

Posted in: Physics | Date: 17/12/2018

Relative density of a substance means the density of an object at a particulart temperature with respect to the density of water at the same temperature.

• ## Question: Difference Between P type and N type semiconductor

Posted in: Physics | Date: 17/12/2018

A pentavalent dopant such as Antimony are known as donor impurities since they donate an extra electron in the crystal structure which is not required for covalent bonding purposes and is readily available to be shifted to the conduction band. This electron does not give rise to a corresponding hole in the valence band because it is already excess, therefore upon doping with such a material, the base material such as Germanium contains more electrons than holes, hence the nomenclature N-type intrinsic semiconductors.

On the other hand when a trivalent dopant such as Boron is added to Germanium additional or extra holes get formed due to the exactly reverse process of what was described in the upper section. Hence this dopant which is also known as acceptor creates a P-type semiconductor.

• ## Question: What is forbidden energy gap

Posted in: Physics | Date: 17/12/2018

The portion of the energy band structure of a semiconductor or insulator between the valence andconduction bands. This portion does not contain a continuum of states as do the valence and conduction bands but may contain discrete states introduced by dopant or deep level impurities in the material.

• ## Question: what is meant by the speed of a photographic film write two units in whitch the ...

Posted in: Physics | Date: 18/12/2018

The speed of a film (or film speed), refers to the measure of a film's sensitivity to light. Each film speed is best suited for a different type of photography. The lower the speed, the longer an exposure to light is necessary to produce image density. If the film speed is higher, it requires less exposure but generally has reduced quality in the form of grain and noise. Noise and grain are the abnormalities in brightness and colour in images; they look similar to a layer of "snow" on a television set. They're measured using the ISO system from the International Organization for Standardization, and are the giant numbers typically seen on a box of film. The abbreviation ASA (American Standard Association) is also used in conjunction with film speed. ASA and ISO are interchangeable.

• ## Question: A city bus starts from station P and finishes at station Q. Between P and Q, it ...

Posted in: Mathematics | Date: 18/12/2018

Total time taken = 1 hr and 30 minute = 90 minutes

Total stoppage time = 12 x 2 = 24 minutes

Thus, total travelling time = 90 – 24 = 66 minutes = 1 1/10 hr = 11/10 hr

Speed = 40 km/hr

Thus, distance = Speed x Time = 40 x 11/10 = 44 km

• ## Question: An amount doubles itself in 10 years with simple interest. What is the rate of i...

Posted in: Mathematics | Date: 18/12/2018

Let the Principal be P and Rate be R

Thus, A = 2P

Hence, SI = A – P = 2P – P = P

T = 10 years

Thus, R = (100 x P)/(P x 10) = 10%

• ## Question: Suyash purchased an AC for Rs. 12,500 and spent Rs. 300 on transportation and Rs...

Posted in: Mathematics | Date: 18/12/2018

CP = ₹ 12500; Transport = ₹ 300; Installation = ₹ 800

Thus, total CP = ₹ 13600

P% = 15% = (P/CP)100

Hence, P = (15 x 13600)/100 = ₹ 2040

Thus, SP = CP + P = ₹ 13600 + ₹ 2040 = ₹ 15640

• ## Question: A, B and C entered into a partnership by investing Rs, 12,000, Rs. 15,000 and Rs...

Posted in: Mathematics | Date: 18/12/2018

Investment of A:B:C = ₹ 12000 : ₹ 15000 : ₹ 18000 = 4 : 5 : 6

Sum of ratios = 4 + 5 + 6 = 15

A’s share = 4x/15

B’s share = 5x/15

C’s share = 6x/15

A’s share of profit = ₹ 3000

Thus, 4x/15 = ₹ 3000

Or, x = ₹ (750 x 15) = ₹ 11250 = Total Profit

• ## Question: A shopkeeper labelled the price of his articles so as to earn a profit of 40% on...

Posted in: Mathematics | Date: 18/12/2018

Let the CP be ₹ 100.

Therefore, the MP is 40% of CP = ₹ 140.

Discount is 20%of MP = ₹ (20 x 140)/100 = ₹ 28.

Thus, actual SP = ₹ (140 – 28) = ₹ 112.

Thus, Profit = ₹ (112 – 100) = ₹ 12.

Profit % = (P/CP)  x 100 = (12/100) x 100 = 12%

• ## Question: If A={2,4,5} , B={7,8,9}, then n(A x B) is equal to

Posted in: Mathematics | Date: 18/12/2018

Given A = {2, 4, 5} and B = {7, 8, 9}

Thus, A x B = {(2, 7), (2, 8), (2, 9), (4, 7), (4, 8), (4, 9), (5, 7), (5, 8), (5, 9)}

Hence, n(A x B) = 9

So, the correct option is B.

• ## Question: Help me to find the matching word in the place of question mark. Doctor : Pat...

Posted in: Bank Clerical | Date: 23/02/2019

Public

• ## Question: A man goes uphill with an average speed of 10 km/h and comes down with an averag...

Posted in: Mathematics | Date: 05/03/2019

Let the distance travelled be ‘x’ km on each side.

Speed (Uphill) = 10 km/hr

Thus, Time (Uphill) = x/10 hr ……………… (i)

Speed (Downhill) = 36 km/hr

Thus, Time (Downhill) = x/36 hr ……………… (ii)

Total time = x(1/10 + 1/36) hr

= x(18 + 5/180) hr

= 23x/180 hr

Average time = 23x/360

Total distance = x km

Hence average speed = (x/23x)360 = 360/23 = 15.65 km/hr

• ## Question: Find the fourth proportional to the numbers 100 : 50 : 40

Posted in: Mathematics | Date: 05/03/2019

Let the fourth proportional be x

Thus, 100:50 :: 40:x

Or, 100/50 :: 40/x

Or, 2 :: 40/x

Or, x = 40/2 = 20

• ## Question: Find the value of x from $-2x^2 + 7x - 6$ .

Posted in: Mathematics | Date: 05/03/2019

–2x2 + 7x – 6

= 2x2 – 7x + 6

= 2x2 – 4x – 3x + 6

= 2x(x – 2) – 3(x – 2)

= (x – 2)(2x – 3)

Or, x = 2 and 3/2

• ## Question: The mean of 25 students In a class is 12 if the teachers are included the mean a...

Posted in: Mathematics | Date: 05/03/2019

The mean age of 25 students is 12 years.

Thus, total age of 25 students = 25 x 12 = 300 years

The mean age of 25 students and 1 teacher = 13 years

Thus, total age of 25 students and 1 teacher = 26 x 13 = 338 years

Thus, the age of the teacher = 338 – 300 = 38 years

• ## Question: A car moves 30 kilometers in 30 minutes and 30 kilometres in 40 minutes fin...

Posted in: Mathematics | Date: 02/05/2019

Given,

Distance travelled in 30 minutes = 30 km

Thus, v1 = 60 km/hr

And distance travelled in 40 minutes = 30 km

Thus, v2 =  45 km/hr

Thus, average velocity =  52.5 km/hr

Given,

Distance travelled in 30 minutes = 30 km

Or, distance travelled in   hour = 30 km

Thus, v1 =  =  =

And distance travelled in 40 minutes = 30 km

Or, distance travelled in =  hours = 30 km

Thus, v2 =  =  =

Thus, average velocity =  =  =

• ## Question: The speed of a boatman in the direction of a stream is 1.5 km/hr. What is the ve...

Posted in: Mathematics | Date: 10/05/2019

As the speed of the stream has not been mentioned, the correct option is (d).

• ## Question: Direction: In the following question, a question is followed by information...

Posted in: Mathematics | Date: 10/05/2019

For the given question, all three statements are sufficiaent to answer it.

• ## Question: If x = 2at- 5bt^2. Where x is in meter and t is m&s, find the dimensions of ...

Posted in: Physics | Date: 12/06/2019

The dimensions of a/b would be in meters/second.

• ## Question: A car moves 30 kilometers in 30 minutes and 30 kilometres in 40 minutes fin...

Posted in: Mathematics | Date: 12/06/2019

Time taken to travel first 30 km = 30 min = ½ hours

Thus, Velocity1 = 60 km/hr

Time taken to travel next 30 km = 40 minutes = 2/3 hours

Thus, Velocity2 = 45 km/hr

Thus, average velocity = (60 + 45)/2 = 105/2 = 52.5 km/hr

• ## Question: What is the other name of Boolean Algebra? In which year was it developed?

Posted in: Mathematics | Date: 18/06/2019

The other name for Boolean Algebra is Binary Algebra or Logical Algebra. It was developed in 1854.

• ## Question: The ratio of number of men and women in a committee is 5:6. If the percentage in...

Posted in: Mathematics | Date: 18/06/2019

Ratio of men:women = 5:6. Thus, sum of ratios = 5+6 =11 Let the total number of members = x So, men candidates = 5x/11 And, no. of women = 6x/11 Now, new number of men = 5x/11 + 20/100(5x/11) = 6x/11 And, new number of women = 6x/11 + 10/100(6x/11) = 6x/11 (1 + 1/10) = 6x/10 Hence, new ratio = 6x/11:6x/10 = 11:10

Articles

## Articles written by me [3]

##### What Ails the Indian Higher Academics Publish...
• Posted in: General
• Date: 05/03/2019

Although the entire focus of the Indian publishing industry is on Higher Academics publishing, especially STMM, there is hardly any concerted effort to eliminate the limiting factors and percolate to the smallest towns and villages. All the major players ar...

##### A Country with a Vibrant Space Program but Un...
• Posted in: English
• Date: 28/12/2018

Of late, there has been a lot of buzz about “Digital India”, “Make in India”, India’s successful low-cost Mars Mission, and the rising number of Indian CEOs in American multinational companies. Consequently, the world is sittin...

• Posted in: Exam Preparation
• Date: 19/03/2019

Very often I come across newspaper and website advertisements pertaining to job-postings that stating that only MBAs are to apply for Management positions. I find this to be rather funny, idiotic and full of arrogance. Is it really that possessing a Managem...

P

Female, 39 Years

## Jitendra P

Male, 23 Years
• Qualification: B.Tech/B.E.
• Teaches:Science, NTSE, Physics, Mathematics, All Subjects, WBJEE, Polytechnic ...
• Areas: South Dum Dum, South End Park

Male, 44 Years

Male, 31 Years

Male, 37 Years

## Sourav M

Male, 27 Years
• Qualification: M.Sc
• Teaches:M.Sc Tuition, Chemistry, IIT JEE Advanced, IIT JAM, IIT JEE Mains

Male, 25 Years

Male, 25 Years

## Mr. U

Male, 34 Years
• Qualification: M.Sc
• Teaches:Physics, Mathematics, Chemistry, Algebra, B.Sc Tuition, Statistics, B....
• Areas: Airport 1 No Gate

Male, 24 Years