An iron needle sinks in water, whereas an iron ship floats. This is because:
A. The ship is hollow.
B. The density of the ship is greater than that of the needle.
C. The weight of the water displaced by the ship is greater than the weight of the ship.
D. The average density of the ship is less than that of water.
Answer: Option D
Solution (By JKSSB Mock Tests)
Though the ship is made of iron, it is hollow inside and traps a large volume of air. This makes the overall or average density of the ship less than the density of water. According to the law of floatation, an object floats if its average density is less than that of the fluid. A solid iron needle has a higher density than water, so it sinks.
Explanation:
The eye lens is a convex (converging) lens. It converges light rays to form a real and inverted image on the retina. The brain processes this signal and flips it so we perceive the world as erect. All other statements are functionally correct. The cornea does indeed do about two-thirds of the focusing.
Explanation:
Michael Faraday discovered electromagnetic induction. He showed that moving a magnet through a coil of wire, or changing the magnetic flux in one coil near another, induces an electrical current. Lenz's law later described the direction of that induced current. Maxwell formulated the classical theory of electromagnetic radiation.
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