QUIZ 3
Q 1 : If x + 1x= 2, then the value ( x2+ 1x2)(x3+1x3) is
 20
 4
 8
 16
Q 2 : The value of cos 1 cos 2 cos 3 ……….cos 177 cos 178 cos 179 is
 0
 12
 1
 12
Q 3: The value of sin225 + sin265 is
 32
 0
 23
 1
Q 4 : ABC is an equilateral triangle and AD perpendicular to BC. Then
AB2+ BC2+ CA2= ?
 2AD2
 3AD2
 4AD2
 5AD2
Q 5 : The sides of a triangle are 3 cm, 4 cm, and 5 cm. The area of the triangle formed by joining the midpoints of this triangle is
 6
 3
 1.5
 .75
Directions : Read the following piechart to answers the questions below:
Q 6: If the total amount spent during the year 1998 was Rs 46000. Find the amount which is spent on food ?
 Rs 2000
 Rs 10580
 Rs 23000
 Rs 2300
Q 7 : Total amount spent was Rs 46000, how much was spent on clothing and housing together?
 Rs 11500
 Rs 1150
 Rs 10000
 Rs 15000
Q 8 : The ratio of the total amount of money spent on housing to that spent on education was :
 5 : 2
 2 : 5
 4 : 5
 5 : 4
Q 9 : find, that the maximum amount was spent on ?
 Food
 Housing
 Clothing
 other
Q 10 : The total exp. Of family in year 1998 was Rs 46000 the family saved during the year.
 Rs 1500
 Rs 15000
 Rs 6900
 Rs 3067
Answer key

2. 1  3. 4  4. 3  5. 3  6. 2  7. 1 
8. 4  9. 1  10. 3 
Solutions
1) (2) x2+ 1/x2=2 ; x3+ 1/x3= 2
When multiply both equations = 4 (ans)
2) (1) cos1.cos2.cos3………….cos90…………………cos189
Cos90 = 0
So, value of equation = 0 (ans)
3)(4) sin2A + sin2B = 1 (when A +B =90)
sin225 + sin 265 =1 (ans)
4) (3) in equilateral triangle 3 *side square = 4*perpendicular square
5) (3) The area of the triangle formed by joining the midpoints of this triangle is one forth of the area of triangle.
Area = ¼ (½ *3*4) = 1.5 (ans)
6) (2) amount which is spent on food = 46000*23/100 = 10580 (ans)
7) (1) amount spent on housing and clothing both = 46000* 25/100 = 11500 (ans)
8) (4) housing : education = 15 : 12 = 5 : 4 (ans)
9) (1) maximum amount was spent on food.
10) (3) saving = 46000 * 15l100 = 6900 (ans)