**Question 1. The value of acceleration due to gravity on the surface of the earth at sea level is**

(a) 4.9 m/s

^{2}

(b) 6 m/s

^{2}

(c) 8 m/s

^{2}

(d) 9.8 m/s

^{2}

**Answer.**(d) 9.8 m/s

^{2}

CBSE Class 6th, 7th, 8th, 9th, & 10th | Help Guide | Solved Exercises | MCQs | Questions & Answers | Sample Papers

(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 links to solutions of all chapters for 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 .

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