Question
Tungsten is used for the manufacture of the filament of
an electric bulb, because –Solution
Tungsten is used because it has the highest melting point of all the metallic elements. It melts at 3410 degrees Celsius. When currentpassesthroughthefilamentitheatsitup. Whenthefilamentreachesacertaintemperature itstartstogiveofflight,that'showwegetalight bulb. The first successful light bulb filaments were made of carbon(fromcarbonizedpaper or bamboo).
The value of ((0.27)2-(0.13)2) / (0.27 + 0.13) is:
4.56 + 56.4 + 64.5 = ? + 10.46
(3/7) x 868 + 25% of 240 = (? + 65)
(506 ÷ 22 + 9 × 3) × ? = 900 ÷ 9
(72 + 30) ÷ 6 + [{75 ÷ 25) + 6} × 2] = ?
(560 ÷ 32) × (720 ÷ 48) = ?
√729 × 5 + 270 - 3 ÷ ∛27 + 4 × ? = 484
(392 + 427 + 226 – 325) ÷ (441 + 128 – 425) = ?
212.3 × 4414.7 × 4623.4 × 4845.85 = 462?
‘A’ and ‘B’ invested Rs. 5000 and Rs. 4200, respectively in a business, together. After 7 months, ‘A’ withdrew 25% of his initial investment...
