std 7 science paper solution 2022,dhoran 7 vigyan paper 2022,ધોરણ 7 વિજ્ઞાન વાર્ષિક પેપર સોલ્યુશન 22

Q.22 write three solutions for the equation 7x-8y=13

Find the area of a coloured paper used to stick to a sphere of radius 7 cm.

A boy appears for 5 papers , each of the same number of maximum marks .He scores in each of the papers in the ratio of 6 : 7:8:9:10 .If his average score in all the five papers together was 60% , then in how many papers did he get more than 50% marks ?

(a) How is pH paper used to find the pH of a solutions? (b) The pH value of water is 7. What will be the pH value of (i) aqueous solution of sodium hydroxide and (ii) dil HCl.

(a) How is pH paper used to find the pH of a solution? (b) The pH value of water is 7. What will be the pH value of (i) aqueous solution of sodium hydroxide and (ii) dil. HCl.

A student took five papers in ail examination, where hill marl were same on each paper. Her marks in these papers were in the proportion of 6:7:8:9:10. In all these papers together, the candidate obtained 60% of the total marks. Then the number of papers in which she got more than 50% marks is 2 b. 3 c. 4 d. 5 e. none of these

The perimeter of a sheet of paper in the shape of a quadrant of a circle is 75 cm. Its area would be (pi = (22)/(7))

A rectangular paper is 44 cm long and 22 cm wide. Let x be the volume of the largest cylinder formed by rolling the paper along its length and y be the volume of the largest cylinder formed by rolling the paper along its width. What is the ratio of x to y? (Take pi = 22/7 )