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Lesson Posted on 19 Apr CBSE/Class 10/Mathematics CBSE/Class 10/Science CBSE/Class 9/Mathematics

Introduction to current electricity

Ramneet Singh

I make my 100%% to enrich the career of students who are the building blocks of our nation with my maximum...

In our day to day life, we find the use of electricity for all our purposes. What is the concept behind the generation of current, where does it come from, is a matter of wonder to all us! Let us get introduced to how electricity is generated! Current, as thought, conventionally flows in the direction... read more

In our day to day life, we find the use of electricity for all our purposes. What is the concept behind the generation of current, where does it come from, is a matter of wonder to all us! Let us get introduced to how electricity is generated!

Current, as thought, conventionally flows in the direction of positive pole of electrode to negative electrode. By the later discoveries, with the help of technologies, it was found that the free electrons were the actual reason behind the flow of current. And surprisingly, it was found that the direction of eletrons flowing in a conductor was opposite to the direction of current flow.

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Comments Answered on 23 Feb CBSE/Class 9/Mathematics

Salman Ahmad Siddiqui

Maths Tutor

Yes, of course 0 is a rational number. All natural numbers whole numbers and integers are also rational numbers. 0 can be written as 0/1 , 0/2 etc Hence it is natural number

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Answers 17 Comments Lesson Posted on 22 Feb CBSE/Class 9/Mathematics

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

QUESTION In a college, where every student follows at least one of the three activities- dance, music, or sports- 65% follow dance, 86% follow music, and 57% follow sports. What can be the maximum and minimum percentage of students who follow A) All three activities B) Exactly two activities ... read more

**QUESTION**

In a college, where every student follows at least one of the three activities- dance, music, or sports- 65% follow dance, 86% follow music, and 57% follow sports. What can be the maximum and minimum percentage of students who follow

A) All three activities

B) Exactly two activities

**ANSWER**

Here the sum of the three percentage figures is 208%, however since every students is involve in at least one of the three activities, the surplus count is 108%, accounted for by the people engaged in 2 or 3 activities.

A) Exactly 3 activities

Max -> 108% extra is accounted for by 54% ppl, taking 2 extra activities(Total of 3 activities)

Min -> I allocate a 2nd activity to each of the 100%, but I am still left with 8%, which must be born by 8% people having 3 activities

For B)

Max -> 92%, since in worst case scenario 8% ppl must be into all 3 activities

Min -> 0%, In case of 54% ppl being into all 3 activities, as shown in A (Part 1), we end up with 0% ppl being into exactly 2 activities

Max exactly 2 sets cannot be 100%, as total is 208%, we must have a minimum of 8% students who like all three activities, hence only a max of 92% remaining folks can like exactly 2 activities

If you assign all 100% people 2 activities, your total will be 200 and not 208%... Also dint we just conclude that 8% ppl minimum are into 3 activities, So at least these 8% ppl need to be excluded right?

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Comments Looking for Class IX-X Tuition

Find best Class IX-X Tuition in your locality on UrbanPro.

Answered on 23 Feb CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

Salman Ahmad Siddiqui

Maths Tutor

2x + 3y=7 Put 2 in place of x and 1 in place of y. 2*2+ 3*1=4+3=7

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Answers 15 Comments Answered on 23 Feb CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

Salman Ahmad Siddiqui

Maths Tutor

N¹ *N² = LCM * HCF 161 *345 =23 * N² N² =2415

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Answers 13 Comments Answered on 23 Feb CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

Salman Ahmad Siddiqui

Maths Tutor

2x 3y=8 X=1 and y=8/6 X=8/6 and y=1 X=-1 and y=(-8)/6 X=(-8)/6 and y=-1

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Answers 6 Comments Looking for Class IX-X Tuition

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Answered on 22 Feb CBSE/Class 9/Mathematics

Salman Ahmad Siddiqui

Maths Tutor

Sin(360)= sin(0)=0 Cos(360)=cos(0)=1 Formula: Sin((360*x)+y)=sin(y) Cos((360*x)+y)=cos(y) Where x is any integer and y is any real number. Sin(360) +cos (360) =1

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Answers 22 Comments Answered on 22 Feb CBSE/Class 9/Mathematics

Salman Ahmad Siddiqui

Maths Tutor

Volume of hemisphere of radius r=(2πr³)/3 =Half of the volume of full sphere ((4πr³)/3) = 2π/3 times of volume of cube of side r.

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Answers 16 Comments Answered on 24 Feb CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

In a trapezium ABCD where AB is parallel to CD, E is the mid-point of BC, prove that ?AED = 1/2 trapezium ABCD.

D Mukherjee

Teacher

Draw a line EF joining E, the mid-point of BC and F, the mid-point of AD. Now EF is parallel to AB Area of Triangle AEF = 1/2 (Area of Trapezium ABEF) Area of Triangle DEF = 1/2 (Area of Trapezuim DCEF) Adding we get Area of Triangle AED = 1/2 (Artea of Trapezium ABCD)

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Answers 1 Comments Looking for Class IX-X Tuition

Find best Class IX-X Tuition in your locality on UrbanPro.

Answered on 27 Feb CBSE/Class 9/Mathematics Tuition/Class IX-X Tuition

Samar Singh

Mathematics Professor

Let?ABC be required triangle AB=AC=5cm BC=8 cm Let AD be the altitude We know that perpendicular drawn from vertex bisect the base. Therefore BD=4 cm Using Pythagoras theorem we get AD= 3 cm Area of ?ABC=1/2 × base×height =1/2×8×3=12 cm2 read more

Let?ABC be required triangle

AB=AC=5cm

BC=8 cm

Let AD be the altitude

We know that perpendicular drawn from vertex bisect the base.

Therefore BD=4 cm

Using Pythagoras theorem we get AD= 3 cm

Area of ?ABC=1/2 × base×height

=1/2×8×3=12 cm2

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