ORAL QUESTIONS
CLASS VIII
TOPIC :-GEOMETRY
1.
Define a Polygon .
2.
How many sides are there in Quadrilateral ?
3.
How many sides are there in Octagon ?
4.
What is a regular Polygon ?
5.
What is a Diagonal ?
6.
What is the sum measures of angles of the Convex Quadrilateral ?
7.
How many sides does Heptagon has ?
8.
Say True / False : The polygon with minimum number of sides is three .
9.
Tell the formula to find sum of all interior angles of a polygon.
10.
What are the Maximum number of right angles in the right angled triangle?
11.
What is the sum of interior angles of a Parallelogram ?
12.
What is a Parallelogram ?
13.
What is Rhombus ?
14.
What is Rectangle ?
15.
Name the closed figure with 4 sides .
16.
What is the number of sides in hexagon ?
17.
How many Diagonals does a regular hexagon have?
18.
What is the Sum of interior angles of a Pentagon ?
19.
What is the sum of the measures of the external angles of any polygon ?
20.
Name the Quadrilaterals whose diagonals bisect each other ?
ENRICHMENT MATERIAL (MATHEMATICS)
Page 1 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ANSWER KEY
1. A Simple closed curve made up of only line segments is called a polygon .
2. Four
3. 8
4. A Regular polygon has equal sides and equal angles .
5. A diagonal is a line segment connecting non- consecutive vertices of a polygon .
6. 360o
7. 7
8. True
9. (n – 2 ) x 180o
10. One
11. 360o
12. A parallelogram is a quadrilateral whose opposite sides are equal .
13. A parallelogram whose all sides are equal is called rhombus.
14. A parallelogram each of whose angles measure 90o is called Rectangle .
15. Quadrilateral
16. Six
17. Nine
18. 540o
19. 360o
20. Parallelogram , Rhombus , Square , Rectangle
ENRICHMENT MATERIAL (MATHEMATICS)
Page 2 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ORAL QUESTIONS
CLASS VIII
TOPIC :-DATA HANDLING
Q1
In our day to day life , the information usually collected in the context of a situation is
known as __________.
Q2
Data available in an unorganized form is called _______________.
Q3
Name any ways by which data can be represented .
Q4
In a bar graph the bars are always horizontal . T/F
Q5
Representation of data in the form of picture is called __________.
Q6
In a bar graph the space between the rectangles is _____________.
Q7
If we change the position of any bar of a bar graph , would it change the information
being conveyed ?
Q8
In a bar graph the width of the rectangle is _____________.
Q9
Frequency gives the number of times that a particular entry occur .T/F
Q10
In the class interval 10-20 what is the lower limit ?
Q11
In the lass interval 20-30 what is the upper limit ?
Q12
What is the width or size of the class interval 10-20 ?
Q13
What are the possible outcomes when two coins are tossed together ?
Q14
When a die is thrown what is the probability of getting a number greater than 5 ?
Q15
What is pie chart ?
Q16
What are the possible outcomes when a coin is tossed ?
Q17
When a die is thrown , what is the probability of getting a number greater than 5 ?
Q18
What are the possible outcomes when a die is thrown ?
Q19
What is the probability of getting an ace from a well shuffled deck of 52 playing cards ?
Q20
When a die is thrown ,what is the probability of getting an even number ?
Q21
When a die is thrown ,what is the probability of getting an odd number?
Q22
When a die is thrown ,what is the probability of getting a number not greater than 5 ?
Q23
When a die is thrown ,what is the probability of getting a prime number?
Q24
What is the formula to find out the probability of an event ?
Q25
Each outcome of an experiment is known as ______________.
ENRICHMENT MATERIAL (MATHEMATICS)
Page 3 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ANSWER KEY
Q. NO.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
ANSWER
Data
Raw
Bar graph, histogram etc
False
Pictograph
Equal
Equal
No
True
10
30
10
(HH,TT,TH,HT)
15.
16.
17.
Graphical representation of data in the form of circle
Head , Tail
18.
19.
1,2,3,4,5,6
or
20.
21.
22.
23.
24.
25.
ENRICHMENT MATERIAL (MATHEMATICS)
P(E) = no of favorable outcomes
Total no. of outcomes
Event
Page 4 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ORAL QUESTIONS
CLASS VIII
TOPIC :-SQUARE AND SQUARE ROOT
Q1
Give an example of any square number .
Q2
Is 100 a square number ?
Q3
Give an example of any even square number .
Q4
Give an example of any odd square number.
Q5
Is 81 a perfect square ?
Q6
What will be the number of zeros in the square of 20 ?
Q7
The square of an even number is always _________.
Q8
The square of an odd number is always __________.
Q9
The square of -9 is __________.
Q10
What will be the unit digit in the square of 81 ?
Q11
What will be the unit digit in the square of 24 ?
Q12
What will be the unit digit in the square of 13 ?
Q13
What will be the unit digit in the square of 15 ?
Q14
What will be the unit digit in the square of 22 ?
Q15
What will be the unit digit in the square of 16 ?
Q16
What will be the unit digit in the square of 44 ?
Q17
Is the square root inverse operation of square ?
Q18
Is any number whose unit digit is 0,1,4,5,6 or 9 must be a square ?
Q19
the sum of first n odd natural number is __________.
Q20
Give an example of Pythagorean triplet .
Q21
What is the value of (-1)2 ?
Q22
What will be the number of digit in the square root of 729 ?
Q23
What will be the number of digit in the square root of 1296 ?
Q24
What is the square of 10 ?
Q25
What is the square of 100 ?
ENRICHMENT MATERIAL (MATHEMATICS)
Page 5 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ANSWER KEY
Q. NO.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
ENRICHMENT MATERIAL (MATHEMATICS)
ANSWER
4,9,16 etc.
Yes
4,16,64 etc.
9,81 etc
Yes
2
Even
Odd
81
1
6
9
5
4
6
6
Yes
Yes
n2
(3,4,5) , (6,8,10) etc
1
100
2
2
100
Page 6 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ORAL QUESTIONS
CLASS VIII
TOPIC :-CUBES AND CUBE ROOT
Q1.
Which number is known as Ramanujan number ?
Q2
Cube of any odd number is even . True / false
Q3
Give an example of number other then Ramanujan number which can be
expressed as the sum of two cubes in two different ways .
Q4
Give an example of cube number .
Q5
What is the cube of 3 ?
Q6
Cube root is the inverse operation of cube .True /False
Q7
Is 27 a perfect cube ?
Q8
For any +ve integer m , m2<m3 .True / false
Q9
What is the value of 103 ?
Q10
If in the prime factorization of any number each factor appears three times ,
then the number is perfect cube . True /false
Q11A
perfect cube does not end with two zeros . T/F
Q12
The cube of a single digit number may be a single digit number . T/F
Q13
The cube of a two digit number may have seven or more digit . T/F
Q14
The cube of a two digit number may be a three digit number . T/F
Q15
A perfect cube does not end with zero . T/F
Q16
Cube of an even number is always ______________.
Q17
Cube of an odd number is always ____________.
Q18
What will be the unit digit in the cube of a number whose unit digit is 1 ?
Q19
What will be the unit digit in the cube of a number whose unit digit is 2?
Q20
What will be the unit digit in the cube of a number whose unit digit is 9?
Q21
What will be the unit digit in the cube of a number whose unit digit is 8?
Q22
What will be the unit digit in the cube of a number whose unit digit is 7?
Q23
What will be the unit digit in the cube of a number whose unit digit is 4?
ENRICHMENT MATERIAL (MATHEMATICS)
Page 7 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
Q24
In how many times each prime factor appear in the cube of a number ?
Q25
If 73=343 then
= __________.
ANSWER KEY
Q. NO.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
ENRICHMENT MATERIAL (MATHEMATICS)
ANSWER
1729
False
4104,13832 etc
8 ,27,64 etc
27
True
Yes
True
1000
True
True
True
False
False
False
Even
Odd
1
8
9
2
3
4
3 times
7
Page 8 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ORAL QUESTIONS
CLASS VIII
TOPIC :-ALGEBRAIC EXPRESSIONS
Q1.
Define algebraic expression.
Q2.
How many terms are there in the expression 4x + 5y.
Q3.
What are the factors of 5x2 in the expression 5x2 + y
Q4.
What is numerical coefficient of y in the expression x-y.
Q5.
Define monomials, and give examples.
Q6.
How many terms are there in the binomial.
Q7.
Give examples of binomials.
Q8.
State trinomials.
Q9.
Is x+y a trinomial?
Q10. What are polynomials?
Q11. Identify like terms in the following expression x, x2, , x3 , 2x.
Q12. Give examples of unlike terms.
Q13. construct a polynomial with three variables.
Q14. why are 3x and 3y not like terms?
Q15. find the sum of x2+y2 and –x2
Q16. what is the sum of x+2y and 2x.
Q17. Subtract 2x + y from y.
Q18. Find the product of 4p and zero?
Q19. Find the area of rectangle whose length and breadth is x2, y 2 respectively.
Q20. Obtained the volume of rectangular boxes whose dimemsions are p,q,r.
Q21. Obtain the product of xy, yz, zx.
Q22. Find the value of a2 x a3 x a5.
Q23. What will you get when you multiply a monomial by a monomial
Q24. How will you define an identity.
ENRICHMENT MATERIAL (MATHEMATICS)
Page 9 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
Q25. (a+b)2=___________
Q26. (a+b)(a-b) = _______________
Q27. What identity is used to find (2x+5y)2
Q28. Tell the identity which is used to find ( p- q)2
Q29. (x+a) (x+b) =_______________________
Q30. Which identity is used to find 112 – 152.
ENRICHMENT MATERIAL (MATHEMATICS)
Page 10 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ANSWER KEY
QUESTIONS
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Q13
Q14
Q15
Q16
Q17
Q18
Q19
Q20
Q21
Q22
Q23
Q24
Q25
Q26
Q27
Q28
Q29
Q30
ENRICHMENT MATERIAL (MATHEMATICS)
ANSWERS
2
5,x,x
-1
2
No
x,2x
y2
3x+2y
-2x
0
x2y2
Pqr
x2y2z2
a10
monomial
a2+b2+2ab
a2- b2
(a+ b)2= a2+b2+2ab
(a - b)2= a2+b2 - 2ab
x2+(a+b)x +ab
a2- b2= (a-b)(a+b)
Page 11 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ORAL QUESTIONS
CLASS VIII
TOPIC : MENSURATION
Q.1.
What is the formula for finding area of trapezium?
Q.2.
What is the formula for finding surface area of cube?
Q.3.
What is the formula for finding surface area of cuboid?
Q.4.
What is the formula for finding total surface area of cylinder?
Q.5.
What is the formula for curved surface area of cylinder?
Q.6.
What is amount of space occupied by a three-dimensional object called
Q.7.
What is the formula for volume of cube?
Q.8.
What is the formula for volume of cuboid?
Q.9.
What is the formula for volume of cylinder?
Q.10. What is quantity that a container hold called?
Q.11. 1 m3 = ________L
Q.12. 1 L = ________ cm3
Q.13. If the length of diagonals of rhombus is 5 cm & 6 cm , what is its area?
Q.14. What is the formula for area of rhombus?
Q.15. If the dimensions of cuboid are 2 cm, 3 cm & 5 cm, find its volume.
Q.16. Find the volume of a cube of side 4 cm.
Q.17. Find the surface area of cube of length 1 cm
Q.18. If area of base of cylinder is 10 m2 and its height is 3 m, what will be its volume?
Q.19. If circumference of base of cylinder is 15 cm and its height is 2 cm , what will be its
curved surface area?
Q.20. How many faces does a cuboid have and what is the shape of each face?
Q.21. Is cuboid a two dimensional shape or three dimensional shape?
Q.22. Is circle a two dimensional or three dimensional?
ENRICHMENT MATERIAL (MATHEMATICS)
Page 12 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010
ANSWER
KEY
MENSURATION
CLASS VIII
QUESTIONS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
ENRICHMENT MATERIAL (MATHEMATICS)
CORRECT ANSWERS
½ (sum of parallel sides ) x h
6 x side2
2 (lb + bh + hl)
2 r( r+h)
2 rh
Volume
(Side)3
Lxbxh
r2h
Capacity
1000 L
1000 cm3
15 cm2
Base
30 cm3
64 cm3
6 cm2
30 m3
30 m2
6 faces, rectangular
Two dimensional
Page 13 of 13
ORALS CLASSVIII
CHANDIGARH REGION 2010