Category: Full List

(A) three time
(B) six times
(C) nine times
(D) none of these

The answer is: (C) nine times
Area = πr²
If radius is increased by 3 times, then
NewArea = π(3r)² = π9r² =9(πr²) =9(Area)
So, area is increased by 9 times.

(A) 1 : 20
(B) 1 : 25
(C) 1 : 40
(D) 1 : 80

The answer is: (A) 1 : 20
Solution
The ratio of 20cm and 4m is: 20cm/4m = 20cm/400cm (1 meter = 100 centimeters)
Hence, ratio = 20/400 = 1/20 = 1:20

(A) 1:20
(B) 1:25
(C) 1:40
(D) 1:80

The answer is: (D) 1:80
Solution
The ratio of 50m and 4km is: 50m/4km = 50m/4000m (1 kilometer = 1000 meters)
Hence, ratio = 50/4000 = 1/80 = 1:80

(A) 180
(B) 182
(C) 184
(D) 186

The answer is: (C) 184
Solution
As, Cost + Profit = Selling Price. Therefore,

Q. What is the solution set of the equation: x²+4x+3=0
(A) {1, 3}
(B) {–1, 3}
(C) {1, –3}
(D) {–1, –3}

The answer is: (D) {–1, –3}
Solution

(A) 4 km/hr
(B) 5 km/hr
(C) 6 km/hr
(D) 7 km/hr

The answer is: (D) 7 km/hr
Solution
Total Distance = 9km + 12km = 21 km. And, Total Time = 1 hour 20 + 1 hour 40 = 3 hours. Hence, Average Speed is