Q1. What is the shape of the given sign board
Q2. Is this 2D or 3D figure?
Q3. What is the shape of this mountain.
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Q4. How many 2D shapes you find in this picture
Q5. What is the shape of this 3D object
Q6. Identify the 3D figures in the given picture
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Q7. Identify the 3D figure given in the picture, also write the shape of the
cross section when this figure is cut horizontally by a plane
Q8. Identify the 2D and 3D figures in the given picture
Q9. What is the shape of cross section when a cone is cut by a plane like this
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Q10. How many shapes you find in this picture
Q11. What is the shape of the given tree trunk, also identify the shape of cross
section when this figure is cut by a plane vertically
Q12. What is density,write its units also.
Q13. Identify the 3D figures in the given picture, also find the shape of cross
section when the 3D figure is cut vertically by a plane
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Q14. Identify the shape of this tent
Q15. Population of a city was 225000.The city was modeled by this given
rectangle (1 unit=1 mile) .Find the population density of the city.
Q16. Calculate density if mass of an object is 343 kg and it takes up 49m3 of
space.
Q17. Population of a city is 989600 and its area is 99160mi2.Find its population
density.
Q18. Sketch the solid produced by rotating the given figure around the given
axis
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Q19. What is the shape of resulting cross section
Q20. Find the mass of an object if its density is 441kg/m3 and it takes up 21m3
of space.
Answers:
A1. octagon
A2. ice cube is three dimensional (3D)
A3. cone
A4. circle, square, rectangle
A5. sphere
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A6. cone
A7. cylinder, shape of cross section is circle
A8. rectangle, triangle, cylinder, cuboid
A9. oval
A10. square, triangles, heptagon
A11. cylinder, shape of cross section is rectangle
A12. Density is the amount of matter that an object has in a given unit of
volume.
Or density is mass per unit volume.
Density of an object is calculated by dividing its mass by its volume.
Density=
Standard units of density are kg/m3
A13. cone, shape of cross section is triangle
A14. triangular prism
A15. 3 people/mi2
A16. 7 kg/m3
A17. 10 people/mi2
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A18. cylinder is produced
A19.parallelogram
A20.9261kg
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