Question

Q11. Which is greater?

          a) 2.5X105   or 7.4 X 10-5      

          b) 1.9 X 10-6  or  1.2 X 10-7

Q12. Simplify the following and write the multiplicative inverse of the answer obtained:

          {(-3)4 x (-3)-4} ÷ (-3)4

Q13.A school collected Rs 2304 as fees from its students. If each

student paid as many paisa as there were students in the school,

how many students were there in the school?

Q14.The usual form of the number 9 × 100 + 7 × 1

(a) 97

(b) 9007

(c) 907

(d) 16

Q15.A is a digit and 3A18 is a multiple of 6. Which of the following can

be the value of A?

(a) 1 or 9

(b) 3 or 6

(c) 0 or 7

(d) 0 or 9

Q16. Find the solution of 2x – 3 = 7.

Q17. What should be added to twice the rational number -73 to get 37 ?

Q18. Bansi has 3 times as many two-rupee coins as he has five-rupee coins. If he has in all a sum of Rs 77, how many coins of each denomination does he have?

Q19. Deveshi has a total of Rs 590 as currency notes in the denominations of Rs 50, Rs 20 and Rs 10. The ratio of the number of Rs 50 notes and Rs 20 notes is 3:5. If she has a total of 25 notes, how many notes of each denomination she has?

Q20. Present ages of Anu and Raj are in the ratio 4:5. Eight years from now the ratio of their ages will be 5:6. Find their present ages.

Q21. How many diagonals does each of the following have?

(a) A convex quadrilateral     (b) A regular hexagon             (c) A triangle

Q22. What is a regular polygon?

State the name of a regular polygon of

(i) 3 sides     (ii) 4 sides (iii) 6 sides


Q23. Find the number of sides of a regular polygon whose each exterior angle has a measure of 45°.

Q24. The measures of two adjacent angles of a parallelogram are in the ratio 3 : 2. Find the measure of each of the angles of the parallelogram.

Q25. State whether True or False.

(a) All rectangles are squares             

(b) All rhombuses are parallelograms 

(c) All squares are rhombuses and also rectangles 

(d) All squares are not parallelograms. 

(e) All kites are rhombuses.

(f) All rhombuses are kites.

(g) All parallelograms are trapeziums.

(h) All squares are trapeziums.
​

Answer 1

Q11.a)First I am giving step by step explanation.

2.5×105

Therefore,5×105=525.So, 2.5×105=2.525

Then,let's find the actual value of another no.

Answer 2

Answer:

2.5*105 7.4*(10-5)

2.5*105 7.4*5

262.5>37

1.9*(10-6) 1.2*(10-7)

1.9*4 1.2*3

7.6>3.6