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Engineering Exams RRB-JE JE (Junior Engineer) CMA (Chemical and Metallurgical Assistant) DMS (Depot Material Superintendent) CS (Chemical Supervisor - Research) MS (Metallurgical Supervisor - Research) 2019 24.05.2019 Paper-1 Shift-1 Easy +1 -0.33 General Science
When we apply a muscular force with a hammer, which other force fixes the nail in the wall?
Correct Answer: B. Friction
Explanation: When you hammer a nail into a wall, you are applying muscular force to drive it in. Once the nail is embedded, friction is the primary force that keeps it fixed in place. This force occurs because the wall material presses against the surface of the nail, creating resistance that opposes any movement. While magnetic, electrostatic, and spring forces exist in other contexts, they do not play a role in securing a typical nail in a wall. Therefore, friction is the force responsible for holding the nail stationary against gravity and other external pressures.
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