Physics - Study Mode
[#766] When does land breeze occur?
Correct Answer
(C) Both A & B
Explanation
Solution: Land breeze occur during fall and winter.
[#767] The cooling by a desert Cooler is based on:
Correct Answer
(C) Evaporative Cooling
Explanation
Solution: Desert coolers are based on the simple principle that when unsaturated air comes in contact with water, the water evaporates. In the process, the moisture content of air increases, while its temperature decreases. The resulting cold but moist air is used for providing cooling.
[#768] Coolis tube is used to produce
Correct Answer
(C) X-rays
Explanation
Solution: X-rays are part of the electromagnetic spectrum, an ionizing radiation with wavelengths shorter than ultraviolet light. X-ray tubes evolved from experimental Crookes tubes with which X-rays were first discovered in the late 19th century, and the availability of this controllable source of X-rays created the field of radiography, the imaging of opaque objects with penetrating radiation.
[#769] Who among the following discovered X-rays?
Correct Answer
(C) W.C Roentgen
Explanation
Solution: Wilhelm Roentgen, Professor of Physics in Wurzburg, Bavaria, discovered X-rays in 1895 accidentally while testing whether cathode rays could pass through glass.
[#770] Ozone layer in the outer atmosphere helps us in
Correct Answer
(D) Absorbing UV radiations
Explanation
Solution: The ozone layer is a layer in Earth’s atmosphere containing relatively high concentrations of ozone (O3) which absorbs 97–99% of the Sun’s medium-frequency ultraviolet light.