**Things to remember...**

- Area of a rectangle = length × breadth
- Area of the square = side × side

**Question 1. Find the areas of the rectangles whose sides are :**

(a) 3 cm and 4 cm

(b) 12 m and 21 m

(c) 2 km and 3 km

(d) 2 m and 70 cm

- Area of a rectangle = length × breadth
- Area of the square = side × side

(a) 3 cm and 4 cm

(b) 12 m and 21 m

(c) 2 km and 3 km

(d) 2 m and 70 cm

- The amount of surface enclosed by a closed figure is called its area.
- Surface Area of a figure can be broken into exact numbers or approximate numbers of square units
- Depending upon the figure, some of square units may be completely covered, or partially covered.
- While using a squared paper, to calculate the area of a figure , we may use the conventions :

- Perimeter is the distance covered once along the boundary of a closed figure .
- Perimeter of a rectangle = 2 × (length + breadth)
- Perimeter of a square = 4 × length of a side
- Perimeter of an equilateral triangle = 3 × length of a side

(Take gravity due to earth 'g'=10 m s

(a) 160 Joules

(b) 320 Joules

(c) 380 Joules

(d) 480 Joules

(a) 4.9 m/s

(b) 6 m/s

(c) 8 m/s

(d) 9.8 m/s

(a) 0 Newton

(b) 2 Newtons

(c) 8 Newtons

(d) 32 Newtons

(a) zero km

(b) 10 km

(c) 30 km

(d) 50 km

(a) Resistance is doubled

(b) Resistance becomes half

(c) Resistance remains same

(d) None

(a) Current

(b) Potential Difference

(c) Resistance

(d) Power

(i) Which one of the following describes the drainage patterns resembling the branches of a tree?

(a) Radial

(b) Dendritic

(c) Centrifugal

(d) Trellis

- All community members must have access to basic and better health care facilities supported by the qualified medical professionals.
- There should be good economic opportunities for all. Community members should be socially well connected for any support or sharing of resources and should have high level of cleanliness and hygiene at personal or community level

That is, we can find integers a and b (≠ 0) such that :

a | ||

√5 | = | |

b |

So, b √5 = a⋅

(i) 140 (ii) 156 (iii) 3825 (iv) 5005 (v) 7429

2 | | | 140 |

2 | | | 70 |

5 | | | 35 |

7 | | | 7 |

| | 1 |

∴ 140 = 2×2×5×7

= 2

- An algorithm is a series of well defined steps which gives a procedure for solving a type of problem. The word algorithm comes from the name of the 9th century Persian mathematician al-Khwarizmi.
- A lemma is a proven statement used for proving another statement.
**Euclid’s Division Lemma :**Given positive integers a and b, there exist unique integers q and r satisfying a = bq + r, 0 ≤ r < b.**Euclid’s division algorithm :**Euclid’s division algorithm is a technique to compute the Highest Common Factor (HCF) of two given positive integers. This is based on Euclid’s division lemma. According to this, the HCF of any two positive integers c and d, with c > d, is obtained as follows:

This post contains chapter wise links to solutions of exercises from NCERT textbook of Science for Class 10th under CBSE.
Each link for the chapter provides solutions to questions given in its main exercises including multiple choice questions, numericals, activities and in-text questions given after a main section to check the under standing of the topic by students .

Which simply means that for our living,

Some substances are inert and cannot be acted upon by the microorganisms and do not breakdown into simple substances. Such substances are called non- biodegradable.

(a) a sunny day.

(b) a cloudy day.

(c) a hot day.

(d) a windy day.

(a) The field consists of straight lines perpendicular to the wire.

(b) The field consists of straight lines parallel to the wire.

(c) The field consists of radial lines originating from the wire.

(d) The field consists of concentric circles centred on the wire.

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