Chapter 15 Visualising Solid Shapes
Chapter 15 Visualising Solid Shapes Very Short Answer Type Question 1. If three cubes of dimensions 2 cm × 2 cm × 2 cm are placed end to end, what would be the dimension of the resulting cuboid? Solution: Length of the resulting cuboid = 2 cm + 2 cm + 2 cm = 6 […]
Chapter 15 Visualising Solid Shapes Exercise 15.4
Chapter 15 Visualising Solid Shapes 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). Solution: When the light falls […]
Chapter 15 Visualising Solid Shapes Exercise 15.3
Chapter 15 Visualising Solid Shapes 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. Solution: Solids Shape of cross-section of vertical cut […]
Chapter 15 Visualising Solid Shapes Exercise 15.2
Chapter 15 Visualising Solid Shapes Exercise 15.2 Question 1. Use isometric dot paper and make an isometric sketch for each one of the given shapes: Solution: Question 2. The dimensions of a cuboid are 5 cm, 3 cm and 2 cm. Draw three different isometric sketches of this cuboid. Solution: Question 3. Three cubes with […]
Chapter 15 Visualising Solid Shapes Exercise 15.1
Chapter 15 Visualising Solid Shapes Exercise 15.1 Question 1. Identify the nets which can be used to make cubes (Cut out copies of the nets and try it): Solution: Fig. (ii), (iii), (iv) and (vi) can be used to make cubes. Question 2. Dice are cubes with dots on each face. Opposite faces of a […]
Chapter 14 Symmetry
Chapter 14 Symmetry Very Short Answer Type Question 1. Draw any two English alphabets having an only a vertical line of symmetry. Solution: Question 2. Draw any two English alphabets having a horizontal line of symmetry. Solution: Question 3. Draw any two English alphabets having both horizontal and vertical line of symmetry. Solution: Question 4. […]
Chapter 14 Symmetry Exercise 14.3
Chapter 14 Symmetry Exercise 14.3 Question 1. Name any two figures that have both line symmetry and rotational symmetry. Solution: English alphabet H and O both have line symmetry and rotational symmetry. Question 2. Draw, wherever possible, a rough sketch of (i) a triangle with both line and rotational symmetries of order more than 1. […]
Chapter 14 Symmetry Exercise 14.2
Chapter 14 Symmetry Exercise 14.2 Question 1. Which of the following figures have rotational symmetry of order more than 1? Solution: The figure (a), (b), (d), (e) and (f) have rotational symmetry more than 1. Question 2. Give the order of rotational symmetry for each figure: Solution:
Chapter 14 Symmetry Exercise 14.1
Chapter 14 Symmetry Exercise 14.1 Question 1. Copy the figures with punched holes and find the axis of symmetry for the following: Solution: The axis of symmetry is shown by following line. Question 2. Give the line(s) of symmetry, find the other hole(s): Solution: Question 3. In the following figures, the mirror line (i.e., the […]
Chapter 13 Exponents and Powers
Chapter 13 Exponents and Powers Very Short Answer Type Question 1. Express 343 as a power of 7. Solution: We have 343 = 7 × 7 × 7 = 73 Thus, 343 = 73 Question 2. Which is greater 32 or 23? Solution: We have 32 = 3 × 3 = 9 23 = 2 × 2 × […]