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KC Sinha: Exercise 23.1- Mathematics Solution Class 11 Chapter 23 त्रि-विमीय ज्यामित

[mathjax] TYPE-I किसी बिन्दु के निर्देशांक पर आधारित प्रश्न : Question 1 निम्नलिखित बिन्दु किस अष्यंश में हैं : (Name the octants in which the following points lie): (i) (1,2,5) Sol : OXYZ (ii)...

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Applicable Grade Class 11
Medium English & Hindi
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TYPE-I किसी बिन्दु के निर्देशांक पर आधारित प्रश्न :

Question 1

निम्नलिखित बिन्दु किस अष्यंश में हैं : 

(Name the octants in which the following points lie):

(i) (1,2,5)

Sol : OXYZ

(ii) (-3,-1,2)

Sol : OX'Y'Z

(iii) (3,-1,2)

Sol : OXY'Z

(iv) (1,2,-3)

Sol : OXYZ'

(v) (-3,-1,2)

(vi) (-3,5,-2)

(vii) (-3,-1,2)

(viii) (-3,1,-2)

(ix) (-3,1,2)

(x)(-3,-1,6)

(ix) (1,2,3)

(xii) (-4,2,-5)

Question 2

निम्नलिखित बिन्दु कहाँ हैं ? (Where are the following points ?)

(i) (0,0,-4)

(ii) (0,3,-2)

Sol :

Question 3

एक बिन्दु xz-तल में स्थित है। इसके y-निर्देशांक के बारे में क्या कह सकते हैं ?

[A point lies in the xz-plane. What can be said about its y-coordinate ?]

Sol :

Question 4

एक बिन्दु x-अक्ष पर स्थित है। इसका y तथा z-निर्देशांक निकालें

[A point lies on the x-axis. Find its y and z-coordinates.]

Sol :

Question 5

माना कि P(2,4,5) कोई बिन्दु है तथा F, P से xz-तल पर खींचे गये लम्ब का पाद है। F के निर्देशांक निकालें।

[Let P(2,4,5) be a point and F be the foot of perpendicular drawn from P to xz-plane. Find the co-ordinates of F.]

Sol :

Question 6

खाली स्थानों को भरें (Fill in the blanks):

(i) xy-तल मे स्थित किसी बिन्दु का z-नियामक ..... है।
[z-co-ordinate of a point lying in xy-plane is ....]
Sol : 0

(ii) x-अख तथा y-अक्ष एक साथ एक तल है जो .... कहलाता है।
[The x-axis and y-axis taken together determine a plane known as .....]

Sol : XY तल

(iii) x-अक्ष पर स्थित बिन्दुओ के नियामक़ के रूप का होता है। 

[The co-ordinates of points on x-axis are of the form ... ]

(iv) xy-तल के बिन्दुओं के नियामक के रूप का होता है । 

[The co-ordinates of points in the xy-plane are of the form ......... ]

Sol : (x,y,0)

(v) yz-तल के बिन्दुओं के नियामक .... के रूप का होता है ।
[Co-ordinates of point on yz-plane is of the form ........]

Sol : (0,y,z)

(vi) निर्देशांक तल त्रिवाम को ...... अष्टांशों में बाँटता है।
[Co-ordinate planes divide the space into .... octants]

Sol : 8


(vii) बिन्दिु (1,2,3) का xy-तल में प्रतिबिम्ब ... है।

[Image of the point (1,2,3) in the xy-plane is ...........]

Sol : (1,2,-3)

Question 7

किसी बिन्दु P के नियामक (1,2,3) है । उन सात बिन्दुओं के नियामक निकालें जिनके नियामकों का निरपेक्ष मान दिए हुए बिन्दु के नियामकों के निरपेक्ष मानों के समान है

[The co-ordinates of a point P are (1,2,3). Find the co-ordinates of the seven points such that the absolute values of their co-ordinates are the same as those of co-ordinates of P.]

Sol :

(-1,2,3),(1,-2,3),(1,2,-3)(-1,-2,3)

(-1,2,-3),(1,-2,-3),(-1,-2,-3)

Question 9

निर्दिष्ट तल में बिन्द का प्रतिबिम्ब निकालें
[Find the image of the point in the specified plane] :

(i) बिन्दु (0,0,-4) का xy-तल में 

(of point (0,0,-4) in the xy-plane.)

Sol :

(ii) बिन्दु (-3,4,7) का yz-तल में

(of point (-3,4,7) in the yz-plane.)

(iii) बिन्दु (5,4,-3) का xy-तल में 

(of point (5,4,-3) in the xy-plane.)

(iv) बिन्दु (-7,2,-1) का zx-तल में 

(of point (-7,2,-1) in the xz-plane.)

(v) बिन्दु (-4,0,1) का zx-तल में 

(of point (-4,0,1) in the zx-plane.)

(vi) बिन्दु (-2,0,0) का xy-तल में

(of point (-2,0,0) in the xy-plane.)

Question 10

माना कि किसी बिन्दु P से x,y तथा z-अक्ष पर खींचे गये लम्बों के पाद A, B, C हैं। A, B, C के निर्देशांक निकालें यदि P के नियामक हैं :

[Let A, B, C be the feet of perpendiculars drawn from a point P to x, y and z-axes respectively. Find the coordinates of A, B, C if coordinates of P are : ]

(i) (4,-3,-7)

(ii) (3,4,2)

(iii) (3,-5,1)

(iv) (4,-2,-6).

Sol :

Question 11

बिन्द (1,-2,-5) से निदेंशांक तल पर खींचे गये लम्बों की लम्बाई निकालें

[Find the length of perpendiculars from point (1,-2,-5) to the co-ordinate planes.]

Sol :

XY तल पर लंब की लम्बाई=-5

Question 12

बिन्दु (-1,-3,4) का x, y, z-अक्षों से दूरी निकालें 

[Find the distance of point (-1,-3,4) from x, y and z-axes.]

Sol :

x-अक्ष से दूरी PB

$=\sqrt{P{A}^{2}+AB^2}$

$=\sqrt{4^{2}+3^{2}}$

=√16+9
=√25=5

x-अक्ष से दूरी$=\sqrt{(-1)^{2}+4^{2}}$

=√1+16
=√17

z-अक्ष से दूरी 

$=\sqrt{(-1)^{2}+(-3)^{2}}$

=√10

x-अक्ष से दूरी$=\sqrt{y^{2}+z^{2}}$

y-अक्ष से दूरी$=\sqrt{x^{2}+z^{2}}$

z-अक्ष से दूरी$=\sqrt{x^{2}+y^2}$

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