pulkit gupta

Asked: October 30, 2020In: Class 10

A contractor plans to install two slides for the children to play in a park. For the children below the age of 5 years, she prefers to have a slide whose top is at a height of 1.5 m, is inclined at an angle of 30° to the ground, whereas for elder children, she wants to have a steep slide at a height of 3m, and inclined at an angle of 60° to the ground. What should be the length of the slide in each case?

NCERT Solutions for Class 10 Maths Chapter 9 Important NCERT Questions SOME APPLICAT IONS OF TRIGONOMETRY (Height and Distance) NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 9.1 Page No:213 Questions No:3

Amaira

Asked: October 30, 2020In: Class 9

A TV tower stands vertically on a bank of a canal. From a point on the other bank directly opposite the tower, the angle of elevation of the top of the tower is 60°. From another point 20 m away from this point on the line joing this point to the foot of the tower, the angle of elevation of the top of the tower is 30° Find the height of the tower and the width of the canal.

NCERT Solutions for Class 10 Maths Chapter 9 Important NCERT Questions SOME APPLICAT IONS OF TRIGONOMETRY (Height and Distance) NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 9.1 Page No:204 Questions No:11

Amaira

Asked: October 30, 2020In: Class 10

From the top of a 7 m high building, the angle of elevation of the top of a cable tower is 60° and the angle of depression of its foot is 45°. Determine the height of the tower.

NCERT Solutions for Class 10 Maths Chapter 9 Important NCERT Questions SOME APPLICAT IONS OF TRIGONOMETRY (Height and Distance) NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 9.1 Page No:204 Questions No:12

Chaitan Singh

Asked: October 21, 2020In: Class 10

Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

NCERT Solution for Class 10 Science Chapter 5 Periodic Classification of Elements NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-81 Questions No-1

Chaitan Singh

Asked: October 21, 2020In: Class 10

What were the limitations of Döbereiner’s classification?

NCERT Solution for Class 10 Science Chapter 5 Periodic Classification of Elements NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-81 Questions No-2

Chaitan Singh

Asked: October 21, 2020In: Class 10

What were the limitations of Newlands’ Law of Octaves?

NCERT Solution for Class 10 Science Chapter 5 Periodic Classification of Elements NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-81 Questions No-3

Chaitan Singh

Asked: October 21, 2020In: Class 10

Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, AI, Si, Ba.

NCERT Solution for Class 10 Science Chapter 5 Periodic Classification of Elements NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-1 Questions No-85

Chaitan Singh

Asked: October 21, 2020In: Class 10

Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)

NCERT Solution for Class 10 Science Chapter 5 Periodic Classification of Elements NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-85 Questions No-2

Chaitan Singh

Asked: October 21, 2020In: Class 10

What were the criteria used by Mendeleev in creating his Periodic Table?

NCERT Solution for Class 10 Science Chapter 5 Periodic Classification of Elements NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-85 Questions No-3

Chaitan Singh

Asked: October 21, 2020In: Class 10

Why do you think the noble gases are placed in a separate group?

NCERT Solution for Class 10 Science Chapter 5 Periodic Classification of Elements NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-85 Questions No-4

pulkit gupta

From the top of a 7 m high building, the angle of elevation of the top of a cable tower is 60° and the angle of depression of its foot is 45°. Determine the height of the tower.

Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

What were the limitations of Döbereiner’s classification?

What were the limitations of Newlands’ Law of Octaves?

Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, AI, Si, Ba.

Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)

What were the criteria used by Mendeleev in creating his Periodic Table?

Why do you think the noble gases are placed in a separate group?

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