Question

1.If 11:121:: 21: then equals

a)123. b)231. c)321. d) 112


2.The ratio of 40 cm to 1 m is

(a) 2:5. (b) 3:5. (c) 4:5. (d) 5:2.


3.The number of multiples of a given number is —————

a) Infinite. b) Finite. c)Zero. d)none of these


4. Which of the following numbers is prime?

(a) 51. (b) 12. (c) 17. (d) 39.


5. The common factor of 4 and 15 is

(a) 1. (b) 2 (c) 3 (d) 5.


6. Area of a rectangle =

(a) Length × Breadth. (b) Length + Breadth. (c) 2 × (Length + Breadth) (d) 2 × (Length × Breadth).


7. Veenu went to a park 20 m long and 10 m wide. She took one complete round of it. The distance covered

by her is

(a) 30 m (b) 60 m. (c) 20 m (d) 10 m.


8. What fraction of ₹ 1 is 25 paise?

(a) 1

2

(b) 1

3


(c) 1
4



(d)1
5




9. The perimeter of regular pentagon of side 1 m is

(a) 5 m (b) 10 m (c) 15m (d) 20m.

10.

2

15

of 225 is

a) 81. b) 18. c) 30 d) 405​

Answer 1

Answer:

1. (b) 231

2. (b) 3 : 5

3. (a) Infinite

4. (c) 17 is a prime number

5. (a) 1

6. Area of rectangle = Length × Breadth (a)

7. (b) 60 m

8. (c) 1/4

9. (a) 5 m

Step-by-step explanation:

$1) \: \: \: 11 : 121 : : 21 : x \\ \: \: \: \: 11 : 121 = 21 : x \\ \: \: \: \: \frac{ _{1 \: \: } \cancel {11}}{_{11 \: \: } \cancel {121}} = \frac{21}{x} \\ \: \: \: \: \frac{1}{11} = \frac{21}{x} \\ x = \frac{21 \times 11}{1} \\ \: \: \: \: x = \underline{ \underline{ 231}} \\ \\ 2) \: \: \: 1 \: \: m = 100 \: \: cm \\ \: \: \: \: 40 \: \: cm : 1 \: \: m \\ \: \: \: \: 40 : 100 \\ \: \: \: \: \underline{ \underline{ 3 : 5}} \\ \\ 3) \: \: \: Infinite \\ \\ 4) \: \: \: 17 \\ \\ 5) \: \: \: 1 \\ \\ 6) \: \: \: Length \times Breadth \\ \\ 7) \: \: \: Perimeter \: \: of \: \: Park \\ = 2(l + b) \\ = 2(20 + 10) \\ = 2 \times 30 \\ = \underline{ \underline{ 60 \: m}} \\ \\ 8) \: \: \: \frac{1}{4} \\ \\ 9) \: \: \: Perimeter \: \: of \: \: Pentagon \\ = 5 \: \: sides \times 1 \: \: m \\ = \underline{ \underline{ 5 \: \: m}}$