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Numbers and Sequences Model Question Paper

10th Standard EM

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Maths

Time : 01:30:00 Hrs
Total Marks : 50
5 x 1 = 5
1. Euclid’s division lemma states that for positive integers a and b, there exist unique integers q and r such that a = bq + r , where r must satisfy

(a)

1 < r < b

(b)

0 < r < b

(c)

$\le$ r < b

(d)

0 < r $\le$ b

2. 74k $\equiv$ ________ (mod 100)

(a)

1

(b)

2

(c)

3

(d)

4

3. An A.P. consists of 31 terms. If its 16th term is m, then the sum of all the terms of this A.P. is

(a)

16 m

(b)

62 m

(c)

31 m

(d)

$\frac { 31 }{ 2 }$

4. The next term of the sequence $\frac { 3 }{ 16 } ,\frac { 1 }{ 8 } ,\frac { 1 }{ 12 } ,\frac { 1 }{ 18 }$, ..... is

(a)

$\frac { 1 }{ 24 }$

(b)

$\frac { 1 }{ 27 }$

(c)

$\frac { 2 }{ 3 }$

(d)

$\frac { 1 }{ 81 }$

5. The value of (13+23+33+...153) - (1+2+3+...+15)is

(a)

14400

(b)

14200

(c)

14280

(d)

14520

6. 7 x 2 = 14
7. We have 34 cakes. Each box can hold 5 cakes only. How many boxes we need to pack and how many cakes are unpacked?

8. Find the greatest number that will divide 445 and 572 leaving remainders 4 and 5 respectively.

9. Solve 8x $\equiv$ 1 (mod 11)

10. Find the number of terms in the A.P. 3, 6, 9, 12,…, 111.

11. In an A.P., sum of four consecutive terms is 28 and their sum of their squares is 276. Find the four numbers.

12. Find the sum of
1+3+5+..+to 40 terms

13. Find the sum of
93+103+,,,+213

14. 3 x 5 = 15
15. Is 7 x 5 x 3 x 2 + 3 a composite number? Justify your answer

16. The sum of first n, 2n and 3n terms of an A.P are S1, S2 and S3 respectively prove that S3 =3 (S2 -S1)

17. Find the general term for the following sequences.
$\frac { 1 }{ 2 } ,\frac { 2 }{ 3 } ,\frac { 3 }{ 4 }$

18. 2 x 8 = 16
19. A man has 532 flower pots. He wants to arrange them in rows such that each row contains 21 flower pots. Find the number of completed rows and how many flower pots are left over.

20. Today is Tuesday. My uncle will come after 45 days. In which day my uncle will be coming?