Question
Which of the following technological inventions came
first?Solution
A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light). The first known practical telescopes were invented in the Netherlands at the beginning of the 17th century, by using glass lenses. They found use in both terrestrial applications and astronomy.
- The dimensions of a cuboidal box are in the ratio 3:2:1. If the volume of the box is 546.75 cm³, what is its lateral surface area?
In a right-angled triangle, the hypotenuse is 13 cm and one of the legs is 5 cm. What is the area of the triangle?
The area of the rectangular field is 540 m² and its perimeter is 94 m. Find how much percent (approximately) less the breadth of the field is compared ...
A sum of Rs. 15979 was divided between Wasim and Simran in such a way that if both invested their shares at 5 percent compound interest per annum. the ...
- A cylindrical road roller has a diameter of 4 m and a length of 2 m. It rotates 8 times every minute. Find the area it rolls over in 25 minutes.
The circumference of a circle is 77 cm and the length of the rectangle is 4 times the radius of the circle. Find the area (in cm2) of the rec...
The side of a square is equal to the perimeter of an equilateral triangle of area 36√3 cm2 . Find the area of the square?
A square’s side is 25% less than the length of a rectangle. The area and breadth of the rectangle are 2000 cm² and 40 cm respectively. Calculate the ...
- Determine which solid has a greater volume.
I) A cuboid having dimensions 7 cm, 10 cm, and 6 cm
II) A cube with each edge measuring 9 cm Radius of a cylinder is increased by 20% and height reduces by 40% so what effect on the volume of cylinder?
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