The heating element of an electric heater is made of
A. Aluminium
B. Iron
C. Nichrome
D. Copper
Answer: Option C
Solution (By JKSSB Mock Tests)
Nichrome (alloy of nickel, chromium) has high resistivity and high melting point, doesn't oxidize easily at high temperature. Copper has low resistivity, not suitable for heating element.
Explanation:
PE = mgh, so directly proportional to height h. If h becomes 2h, PE becomes 2 × 100 = 200 J, assuming g constant. For large heights, g varies, but basic assumption. Thus 200 J.
Explanation:
The area under the curve of a velocity-time graph represents the total displacement covered by an object in a given time interval. Since velocity = displacement/time, the product of velocity and time (the area) yields displacement. The slope of a velocity-time graph, conversely, represents acceleration.
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