Friday, December 25, 2009
Math Quiz X - Of Perimeters and Areas
Math Quiz IX - One Challenging Question!
If the base is 8 cm, find the length of AB.
Math Quiz VIII - Percentages
is then decreased by 40%. The percentage change
between the final number obtained
and the other is increased by 40%.
The percentage increase in their products is :
the square of the number and the number itself
as a percentage of the original number is :
c) (x - 1)100 d) 100x
isosceles triangle is cut off. The percentage of the remaining
part of the square is :
what percentage of the original square remains?
Math Quiz VII - Profit, Loss and Discount
8. (c) 9. (a) 10. (b) 11. (c) 12. (b) 13. (c)
Thursday, December 24, 2009
Math Quiz VI
Note : All the following questions pertain
to the figure on the left which shows
a square with semicircles on its opposite sides.
1. If each side of the square is 14 cm, the perimeter of the figure equals :
a) 56 cm b) 64 cm c) 72 cm d) 84 cm
2. If each side of the square is 14 cm, the area of the figure equals :
a) 308 sq cm b) 420 sq cm c) 504 sq cm d) 630 sq cm
3. If the radius of each semicircle is 'r', the perimeter of the figure equals :
a) r(pi + 4) b) 4r(pi +2) c) 2r(pi + 2) d) 2r(pi + 4)
4. If the radius of each semicircle is 'r', the area of the figure equals :
a) (r^2)[pi + 2] b) (r^2)[pi + 4] c) 2(r^2)[pi + 4] d) 4(r^2)[pi + 1]
5. If the radius of each semicircle is 3.5 cm, the perimeter of the figure equals :
a) 35 cm b) 42 cm c) 50 cm d) 56 cm
6. If the radius of each semicircle is 3.5 cm, the area of the figure equals :
a) 87.5 sq cm b) 60 sq cm c) 93.5 sq cm d) 105 sq cm
7. If the perimeter of the figure is 72 cm, the radius of each semicircle is :
a) 7 cm b) 10.5 cm c) 14 cm d) 17,5 cm
8. If the perimeter of the figure is 72 cm, the area of the figure is :
a) 560 sq cm b) 616 sq cm c) 630 sq cm d) 700 sq cm
9. If the area of the figure is 1837.50 sq cm, then the radius of the semicircle is :
a) 10.5 cm b) 14 cm c) 17.5 cm d) 21 cm
10. If the area of the figure is 1837.50 sq cm, then the perimeter of the figure is :
a) 280 cm b) 350 cm c) 420 cm d) 490 cm
11. If the diagonal of the square is 7(rt2) cm, then the perimeter of the figure is :
a) 30 cm b) 40 cm c) 50 cm d) 60 cm
12. If the diagonal of the square is 7(rt2) cm, then the area of the figure is :
a) 70 sq cm b) 73.5 sq cm c) 80.5 sq cm d) 87.5 sq cm
----------Answer Key----------
1. (c) 2. (c) 3. (d) 4. (b) 5. (c) 6. (a)
7. (c) 8. (b) 9. (a) 10. (b) 11. (c) 12. (d)
Math Quiz V
If the first number increases by 20%
then the new product is
the 2 semicircles shown,
and hypotenuseAC = 14 cm
and another 30 km at 60 kmph;
for a school magazine. If 20% of the 1st 20 sold
were in colour, 40% of the next 30sold were in colour,
what percent of the 60 ads sold were in colour?
and after the third bounce it rises to a height of 24 m.
If the height to which the ball rises after each bounce
is always the same fraction of the height
Math Quiz IV
Math Quiz III
Math Quiz II
angle DBC = 45 deg, then angle ABC equals :
for w weeks. His daily wage equals Rs :
then the mean of x and y is :
Math Quiz I
a) 16 b) 36 c) 64 d) 96
2. A copier makes 3 copies every 4 seconds.
How many minutes will it take to make 9000 copies?
a) 60 b) 100 c) 120 d) 200
3. A square of perimeter 24 cm has
semicircles on a pair of opposite sides.
The total area of the figure is:
4. In 3 games a team scores 385, 70 and 190.
In the 4th game, the team scores such that
the average score in the 4 games is 220.
Their 4th game score is:
a) 135 b) 155 c) 220 d) 235
5. When x = 0.6, then the value of 3x^2 - 1.8x + 0.3 equals :
a) - 0.3 b) 0 c) 0.3 d) 1.08
6. Over a 3 week period, the price of gold
increased by 25% in the 1st week, decreased
by 20% in the 2nd week and increased by 5%
in the 3rd week. If the price in the
beginning of the 1st week was x,
then the price at the end of the 3rd week equals:
a) 0.95x b) x c) 1.05x d) 1.15x
7. A rectangle is equal in area to a square of side 12 cm.
If the rectangle has a width of 9 cm, the length of the diagonal is :
a) 20 cm b) 22 cm c) 24 cm d) 25 cm
8. The ratio (0.2)^8 : (0.2)^5 equals:
a) 0.0008 b) 0.008 c) 0.08 d) 0.8
9. The ratio (1/3)^2 : (1/3)^4 equals:
a) 9 : 1 b) 3 : 1 c) 1 : 9 d) 1 : 3
10. The difference in areas of 2 squares
whose diagonals are 34 cm and 27 cm equals :
a) 106.75 sq cm b) 213.5 sq cm c) 427 sq cm d) 729 sq cm
----------Answer Key----------
1. (c) 2. (d) 3. (b) 4. (d) 5. (c) 6. (c) 7. (d) 8. (b) 9. (a) 10. (b)