Page 391 - Start Up Mathematics_8 (Non CCE)

Exercise 18.3 Quizzes
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1. 616 cm , 924 cm 2. 3,772 cm 3. ` 22,000 1. Only the cube at the centre of the original cube will not
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4. ` 528 5. (a) 110 m (b) 1.75 m 6. 1,500 have any paint.
7. 5 : 4 8. 1,760 cm 2 9. 7,755 cm 2 2. (a) 120 cubes (b) 36
10. (a) 968 cm (b) 1,161.6 cm (c) 2,140.66 cm 2 Chapter 19
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11. ` 63.53 Exercise 19.1
Exercise 18.4 1. (a) 11 (b) 13 2. (a) 4 (b) 9
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1. 0.176 m 2. 275 L 3. 52.5 cm 4. ` 844.80 3. 14, 111 and 42 respectively
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5. 4.2 cm 6. 7 cm, 2,464 cm 7. 4,710 cm 3 Exercise 19.2
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8. 1,056 m , 4 m 9. Tin with square base, 42 cm 3 1. 6, 10, 14
10. 150 11. 22.88 kg 2. (a) 6, 15 (b) 4, 8 (c) 12,20
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12. (a) 3 cm (b) 141.3 cm 13. 1,078 cm 3 3. (a) 234, 324, 342, 432 (b) 234, 243, 324, 342, 423, 432
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14. 2,794.176 cm 15. 8,96,000 dm 4. (a) 35, 200, 750, 625, 130
(b) 200, 750, 130

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16. 3,773 metric ton 17. 42,240 cm , 337.92 kg 5. 0, 3, 6 or 9 6. 2
18. 5 : 3 Riddle
Review Exercises 30
Multiple Choice Questions Exercise 19.3
1. d 2. a 3. b 4. b 1. (a) X = 5, Y = 8 (b) B = 6
5. b 6. b (c) The various solutions are:
Solve Mentally Q: 2 2 4 4 P: 1 6 2 7 T: 4 5 8 9
True or False
1. True 2. True 3. False 4. False 5. True (d) P = 4, Q = 7 (e) R = 2, S = 5 (f) No solution
Fill in the Blanks 4.
1. space 2. 1 3. co-axial, radii
4. 1,000; 10,00,000 5. 144 m 3
Answer in One Word or a Line
1. The size of the space region of the body is called its
volume. The standard unit of volume of the space region
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is 1 cm .
2. A solid having a curved lateral surface with congruent
circular ends is called a right circular cylinder. Gas
cylinder, coke cans.
3. Volume of hollow cylinder = External volume – Internal
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volume = πh(R – r ) cubic units
4. 1,000 L
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5. Length of the diagonal of cuboid = l + b + h units 9
5.
Let’s Evaluate 8 4
1. 80,000 2. 36 3. 90 m × 75 m × 60 m
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4. 89,760 cm 5. 2,079 cm 6. 2 : 3
7. C : C = 2 : 5 and V : V = 4 : 25, where C and C are 7 5 3
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1
1
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curved surface areas and V and V are volumes of two
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cylinders respectively. 6 2
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8. 286 cm 9. 0.512 m , 0.8 m 10. 10,560 cm , 88.704 kg 1
Thinking Skills 6. A = 8, B = 16, C = 32, D = 1,024, E = 1,024
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1. 8,333 (approx.) 2. 6 m 4. 60 cm
7. 6 3 4
Values and Life Skills 7 5
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1. 12,00,000 L 2. (a) 66 m (b) ` 1,650 ×
Exemplar Problems 3 1 7 0
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1. d 2. c 3. h ; 6 h 4. 36 : 1 4 4 3 8 X
5. False 6. 45, 000 m 3 4 7 5 5 0
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