Question : The outer circumference of the circular race track is 528 metres. The track is everywhere 14 metres wide. The cost of levelling the track at the rate of Rs. 10 per sq. metre is:
Option 1: Rs. 77,660
Option 2: Rs. 66,760
Option 3: Rs. 76,760
Option 4: Rs. 67,760
Correct Answer: Rs. 67,760
Solution : Given, The outer circumference of the circular race track = 528 metre Width of track = 14 m Cost of levelling = Rs. 10 per sq. metre Let the outer radius be $r$. So, $2 \pi r = 528$ ⇒ $r=\frac{528\times 7}{2\times 22}$ ⇒ $r=84$ metre Inner radius = 84 – 14 = 70 metres Area of track = $\pi (84)^2-\pi (70)^2$ $= \frac{22}{7}\times (84-70)(84+70)$ = 6776 sq. metres Total lost of levelling = 10 × 6776 = Rs. 67,760 Hence, the correct answer is Rs. 67,760.
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Question : In a 500-metre race, the ratio of speeds of two runners P and Q is $3:5$. P has a start of 200 metres, then the distance between P and Q at the finish of the race is:
Option 1: P wins by 100 metres
Option 2: Both reach at the same time
Option 3: Q wins by 100 metres
Option 4: Q wins by 50 metres
Question : What is the length (in metres) of the longest rod that can be placed in a room which is 2 metre long, 2 metre broad, and 6 metre high?
Option 1: $8$
Option 2: $2\sqrt{11}$
Option 3: $3\sqrt{11}$
Option 4: $10$
Question : A rectangular lawn whose length is twice its breadth is extended by having four semi-circular portions on its sides. What is the total cost (in INR) of levelling the entire lawn at the rate of INR 100 per square metre, if the smaller side of the rectangular lawn is 12 m? (Take $\pi=3.14$)
Option 1: 85,320
Option 2: 78,650
Option 3: 86,540
Option 4: 97,625
Question : Directions: Sunita walks 45 metres towards the south, then turns right and walks another 45 metres. She then turns right and walks for 20 metres to reach point L. She then again turns to her right and walks for 45 metres. How far (in metres) is she from point L?
Option 1: 50 metres
Option 2: 45 metres
Option 3: 25 metres
Option 4: 60 metres
Question : The sides of a triangular park are 35 m, 53 m, and 66 m. The cost of levelling the park at the rate of INR 9.25 per m2 is:
Option 1: INR 8,584
Option 2: INR 8,547
Option 3: INR 8,621
Option 4: INR 8,510
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