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Asked on 07 Apr Schools/ICSE Schools

What are commercial and non-commercial activities?

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Lesson Posted on 18 Mar Schools/IGCSE Schools Schools/ICSE Schools CBSE/Class 11/Commerce/Economics

Characteristics/Qualities of Good Money - Class XII Economics (Macro-Economics)

Rajiv Vadera

I am MBA Finance. I believe in conceptual learning and not just theoretical.

Qualities/Characteristics of Good Money - HSC/SYJC/Class 12/Standard XII Macro-Economics - Commerce - Maharashtra State Board Also helpful for IGCSE/GCSE Economics and ICSE Class 10 read more

Also helpful for IGCSE/GCSE Economics and ICSE Class 10

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Comments Lesson Posted on 06 Mar CBSE/Class 8/Science Schools/ICSE Schools IIT JEE/IIT - JEE Mains/Physics/Physics and Measurement

Reflection Of Light (Questions)

Soumi Roy

I am an experienced, qualified tutor with over 5 years of experience in teaching maths and physics across...

1. Question: Define reflection of light. Answer: The phenomenon by which a ray of light changes the direction of propagation when it strikes a boundary between different media through which it cannot pass is described as the reflection of light. 2. Question: Name the two types of reflection. Answer:... read more

1. Question:

Define reflection of light.

Answer:

The phenomenon by which a ray of light changes the direction of propagation when it strikes a boundary between different media through which it cannot pass is described as the reflection of light.

2. Question:

Name the two types of reflection.

Answer:

The two types of reflection are regular reflection and irregular or diffused reflection.

3. Question:

What is meant by diffused reflection?

Answer:

In this type of reflection the different portions of the surface reflect the incident light in different directions and no definite image is formed but the surface becomes visible.

4. Question:

Name the phenomenon due to which we see the non-luminous objects.

Answer:

It is due to diffused or irregular reflection of light that we see the non-luminous objects.

5. Question:

While looking at your image in a large plane mirror, if you touch your left ear it appears as if your image has touched the right ear. Why?

Answer:

It is due to lateral inversion that we feel that the image has touched the right ear.

6. Question:

Name any one device based upon the principle of reflection of light by plane mirrors.

Answer:

Periscope is a device based on the principle of reflection of light.

7. Question:

Define magnification.

Answer:

The ratio of the height of the image to the height of the object is called the linear magnification.

8. Question:

What type of surface causes regular reflection?

Answer:

Smooth polished surfaces cause regular reflection.

9. Question:

Define a) Centre of curvature b) Pole of a spherical mirror

Answer:

Centre of curvature is the centre of the sphere of which the spherical mirror forms a part. Pole of a mirror is the midpoint of the aperture of the spherical mirror.

10. Question:

What kind of mirror is used in a car to view the traffic behind it?

Answer:

Convex mirror is used in a car to view the traffic behind it.

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Lesson Posted on 06 Mar CBSE/Class 8/Maths Schools/ICSE Schools CBSE/Class 10/Mathematics

How To Solve Compound Interest Sums?

Soumi Roy

I am an experienced, qualified tutor with over 5 years of experience in teaching maths and physics across...

The formula for Compound Amount: P [1+ R/100]n [When money is compounded annually] = P [1+ R/(2*100)]2n [When money is compounded half-yearly] = P [1+ R/(12*100)]12n [When money is compounded monthly] Also, A = CI + P Where, P= Principal R= Rate of Interest n=Time (in years) A= Amount CI=... read more

The formula for Compound Amount:

P [1+ R/100]^{n} [When money is compounded annually]

= P [1+ R/(2*100)]^{2n} [When money is compounded half-yearly]

= P [1+ R/(12*100)]^{12n} [When money is compounded monthly]

Also, A = CI + P

Where,

P= Principal

R= Rate of Interest

n=Time (in years)

A= Amount

CI= Compound Interest

Solved Questions

Questions 1:

Find the amount if Rs 20000 is invested at 10% p.a. for 3 years.

Solution:

Using the formula: A= P [1+ R/100]^{n}

A = 20000 [1 + (10/100)]^{3}

On Solving, we get A = Rs. 26620

Question 2:

Find the CI, if Rs 1000 was invested for 1.5 years at 20% p.a. compounded half yearly.

Solution:

As it is said that the interest is compounded half yearly. So, the rate of interest will be halved and time will be doubled.

CI = P [1+(R/100)]^{n} - P

CI = 1000 [1+(10/100)]^{3}- 1000

On Solving, we get

CI = Rs. 331

Question 3:

The CI on a sum of Rs 625 in 2 years is Rs 51. Find the rate of interest.

Solution:

We know that A = CI + P

A = 625 + 51 = 676

Now going by the formula: A = P [1+(R/100)]^{n}

676 = 625 [1+(R/100)]^{2}

676/625 = [1+(R/100)]^{2}

We can see that 676 is the square of 26 and 625 is the square of 25

Therefore, (26/25)^{2} = [1+(R/100)]^{2}

26/25 = [1+(R/100)]

26/25 - 1 = R/100

On solving, R = 4%

Question 4:

A sum of money is put on CI for 2 years at 20%. It would fetch Rs 482 more if the interest is payable half yearly than if it were payable yearly. Find the sum.

Solution:

Let the Principal = Rs 100

When compounded annually,

A = 100 [1+20/100]^{2}

When compounded half yearly,

A = 100[1+10/100]^{4}

Difference, 146.41 - 144 = 2.41

If difference is 2.41, then Principal = Rs 100

If difference is 482, then Principal = 100/2.41 × 482

P = Rs 20000.

Question 5:

Manish invested a sum of money at CI. It amounted to Rs 2420 in 2 years and Rs 2662 in 3 years. Find the rate percent per annum.

Solution:

Last year interest = 2662 - 2420 = Rs 242

Therefore, Rate% = (242 * 100)/(2420 * 1)

R% = 10%

Important Formula: To find the difference between SI and CI for 2 years, we use the formula Difference = P[R/100]^{2}

Question 6:

The difference between SI and CI for 2 years at 20% per annum is Rs 8. What is the principal?

Solution:

Using the formula: Difference = P (R/100)^{2}

8 = P[20/100]^{2}

On Solving, P = Rs 200

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Comments Lesson Posted on 05 Mar Schools/ICSE Schools CBSE CBSE/Class 11

Rajiv Vadera

I am MBA Finance. I believe in conceptual learning and not just theoretical.

Economic Activities - Business:Meaning and its features Commerce Std XI/FYJC - Organisation of Commerce and Management (OC/OCM)

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Comments Lesson Posted on 28 Feb CBSE/Class 11/Commerce/Economics Tuition/BBA Tuition/Micro and Macro Economics Tuition/BCom Tuition/Micro & Macro Economics

Factors affecting Demand-CBSE/NCERT, Class 12/StdXII/SYJC/HSC, ICSE Micro-Economics

Rajiv Vadera

I am MBA Finance. I believe in conceptual learning and not just theoretical.

What are the factors that affect demand?

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Lesson Posted on 25 Feb CBSE/Class 10 Schools/ICSE Schools

How to plan and study throughout the year...!

Momentum Learning Center

Momentum Learning Center believes in providing quality education for 8th, 9th,10th students for CBSE/ICSE...

Dear Students, For getting good score in any examination requires plan and regular study through out a year to get good marks/ grades. Here are the few tips which you might be helpful. You must have a proper timetable for studies[an easy one to follow]. Know the syllabus and study accordingly. Set... read more

Dear Students,

For getting good score in any examination requires plan and regular study through out a year to get good marks/ grades. Here are the few tips which you might be helpful.

- You must have a proper timetable for studies[an easy one to follow].
- Know the syllabus and study accordingly.
- Set specific goals for study time.
- Give extra time to the subject and topics in which you are up to the mark.
- Time management is the key.
- Give time to self-study.
- If you study in the morning then start with triky subject.
- Make a schedule for weekly group discussion to test your pace.
- Follow helathy routine and lifestyle.
- Have a designated study space.
- Review Constantly.
- Try not to do too much studying at one time.
- Make a seprate notebook for formulae and mind maps.
- PUT Phone AWAYYYYYYYYYYYYY...!

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Comments Lesson Posted on 23 Feb CBSE/Class 11/Commerce/Economics CBSE/Class 12/Commerce Schools/ICSE Schools

Rajiv Vadera

I am MBA Finance. I believe in conceptual learning and not just theoretical.

Meaning of Demand, Individual Demand and Market Demand in Economics

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Comments Lesson Posted on 14 Feb CBSE Schools/ICSE Schools CBSE/Class 11

Basic Accounting Terms Part 3: CBSE/NCERT - Std/Class 11/XIth, ICSE Class 9th Commercial Studies

Rajiv Vadera

I am MBA Finance. I believe in conceptual learning and not just theoretical.

Class 11/FYJC-Commerce State Board -

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Lesson Posted on 12 Feb CBSE Schools/ICSE Schools CBSE/Class 11/Commerce

Basic Accounting Terms Part 2: CBSE/NCERT - Std/Class 11/XIth, ICSE Class 9th Commercial Studies

Rajiv Vadera

I am MBA Finance. I believe in conceptual learning and not just theoretical.

Class 11/FYJC-Commerce State Board

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