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2. A surface at temperature T0 °K receives power P by radiation from a small sphere at temperature T >> T0 and at a distance d. if both T and d are doubled, the power received by surface will becomes approximately
P | 2 P | 4 P | 16 P |
4. A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in t1 minutes from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes; then
t1 - t2 = t3 | t1 < t2 < t3 | t1 > t2 > t3 | t1 < t2 > t3 |
5. A body cools from 60°C to 50°C in 10 minutes. If the room temperature is 25°C and assuming newton’s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be
38.5°C | 40°C | 42.85°C | 45°C |
7. Solar radiation emitted by sun resembles that emitted by a black body at a temperature of 6000 K. maximum intensity is emitted at a wavelength of about 4800 A°. if the sun were cooled down from 6000 K to 3000 K, then the peak intensity would occur at a wavelength of
4800 A° | 9600 A° | 2400 A° | 19200 A° |
8. A person with dark skin as compared to a person with white skin will experience
Less heat and less cold | More heat and more cold | More heat and less cold | Less heat and more col |
9. Unit of distance used in navigation is
Nautical mile | Kilometre | Light year | Yard |
10. Match the columns:
List I List II
Forms Quantities
A. Cu sec 1. Pressure
B. Byte 2. Intensity of earthquakes
C. Richter 3. Rate of flow
D. Bar 4. Computer memory
4 1 2 3 | 2 4 3 1 | 3 4 2 1 | 3 2 1 4 |
*Click on the QNo to display a Question.
Total | Ans | ||
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