Knowledge for all                   classes 

 

1. Mention any  four rational numbers  which are  less than 5?

-1, 1, 2 and  3

 

2. What is the multiplicative inverse of - 3/ 11 and - 3?

- 3/ 11 = - 11/ 3 and -1/ 3

 

 3. Name the additive and multiplicative identities of rational numbers.

1 and 0

 

4. What is the associative  property  applicable to?

Addition and multiplication

 

5. What is the multiplicative  identity of rational numbers?

1

 

6. Which is the smallest  perfect  number?

6

 

7. What is QAD?

Quod Erat Demonstrandum

 

8. What is the sum of  the first  four  odd  natural numbers?

16

 

9. What are  the two classifications of the  surface  area of a hemisphere?

CSA(Curved Surface Area) and TSA(Total Surface Area)

 

10. Give  two real- life examples of  hollow hemispheres.

Coconut shell and bowl

 

 11. What are  the first ten  prime numbers?

2,  3, 5, 7,  11, 13, 17, 19, 23, 29

 

12. How many  factors do a  prime  number have?

1 and the  number itself

13. What is an algebraic expression with one  term  called?

Monomial

 

14. What  type of  term 2x+7y is?

Binomial

 

15. Which bar graph  shows  data in intervals?

Histogram

 

16. What is  a whole unbroken line  called in a line graph?

Linear graph

 

17. How many centimetres make a decameter?

1000

 

18. Which is the  only  number that  cannot be used as a divisor?

0

 

19. What is the ratio of 10 metres  to 10 km?

1:1000

 

20. What is  the percentage of 2:5?

40% 

21. Name 2 diseases caused by a virus.

Polio and Chicken Pox

 

22. Which animal never drinks water in its entire life?

Kangaroo rat

 

23. Name the common preservative used in pickles and jam.

Sodium benzoate

 

24. Which food contains lactobacillus?

Curd

 

25. Name the process which converts sugar into alcohol by yeast.

Fermentation

 

26. Which microbe carries malaria?

Female Anopheles mosquito

 

27. Name the three mediums through which sound can travel.

Solid, liquid, and gas

 

28. What is “time-period”?

The time taken by an object to complete one oscillation is called a “time-period”.

 

29. What does friction produce?

Heat

 

30. What is the physical phase of life called?

Protoplasm