NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev

Mathematics (Maths) Class 7

Created by: Praveen Kumar

Class 7 : NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev

The document NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev is a part of the Class 7 Course Mathematics (Maths) Class 7.
All you need of Class 7 at this link: Class 7

Exercise 15.3 

Question 1: 

What cross-sections do you get when you give a:
(i) vertical cut (ii) horizontal cut to the following solids?
(a) A brick    
(b) A round apple    
(c) A die
(d) A circular pipe    
(e) An ice-cream cone.

Answer 1:

S.No.Name of articleFigureVertical cutHorizontal
 cut
(a) A brickNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev
(b)A round appleNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev
(c)A dieNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev
(d)A circular pipeNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev
(e)An ice-cream coneNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev

 

Exercise 15.4 

Question 1:

A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow. 

(You may try to experiment first and then answer these questions). 

NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev    NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev

Answer 1: 

S.No.ObjectShadowShape's name
(i)A ballNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevCircle
(ii)A cylindrical pipeNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevLine
(iii)A bookNCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevRectangle

 

Question 2: 

Here are the shadows of some 3-D objects, when seen under the lamp of the overhead projector. Identify the solid (s) that match each shadow. 

(There may be multiple answers for these!) 

NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev
NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev
NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev
NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRev

 

Answer 2: 

S. No.ShadowShape's Name3-D objects
(i)NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevCircleChapatti, Football, Disc, Plate etc.
(ii)NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevSquareDie, Square paper sheet, cubical magic box, Chalk box etc.
(iii)NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevTriangleIce-cream cone, Birthday cap, etc.
(iv)NCERT Solutions(Part - 2) - Visualising Solid Shapes Class 7 Notes | EduRevRectangleGeometry box, Book, Table etc.

 

Question 3: 

Examine if the following are true statements: 

(i) The cube can cast a shadow in the shape of a rectangle. 

(ii) The cube can cast a shadow in the shape of a hexagon. 

Answer 3:

(i) True

(ii) False

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