Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NDA2015General AbilityGeneral ScienceActual

When you walk on a woolen carpet and bring your finger near the metallic handle of a door an electric shock is produced. This is because

Options

  1. Acharge is transferred from your body to the handle
  2. Ba chemical reaction occurs when you touch the handle
  3. Cthe temperature of the human body is higher than that of the handle
  4. Dthe human body and the handle arrive at thermal equilibrium by the process

Correct answer

A. charge is transferred from your body to the handle

Step-by-step solution

All materials are made up of negatively- and positivelycharged particles. These usually exist in equal amounts, balancing each other out. But when two materials come into contact, one may 'steal' negatively-charged electrons from the other. One material ends up with more negative charges than positive ones, meaning that it becomes negatively-charged overall, whilst the other becomes positively-charged. If the charges cannot move away as they are produced, they accumulate in the material as static charge, or electri

Practice General Science on Quantrex Academy →

More from General Science

For an object in gravitational field, the gravitational potential is the same at two points A and B , but the gravitational field is not the same at these two points. Which one of 2026A very large container consists of an ideal gas. The speed of sound in the gas is x . When the pressure of the gas is doubled while keeping the temperature constant, the speed of s 2026A constant power machine pulls a block on a smooth horizontal surface. Which one of the following correctly describes the relation between speed of the block (v) and time (t) ? 2026A ball is dropped from rest from height h above the ground in frame S (the Earth's frame). Another frame S' is moving upwards with constant speed u relative to the Earth. In frame 2026A pendulum of length L oscillates with an angular amplitude of = 60^ and time period T . Let T₀ = 2 L g be the time period for small angle of oscillations, where g is the accelerat 2026A solid of mass m has temperature-dependent specific heat as C(T) = C₀ + T , where C₀ and are constants. The solid is heated from T₁ to T₂ . Which one of the following is the corre 2026In a certain process, the relation between pressure (P) and volume (V) , for an ideal gas, is given by PV^2 = constant . If the initial temperature is T₁ and the final temperature 2026An object is placed far beyond the centre of curvature of a concave mirror. The object then starts accelerating towards the mirror. Which one of the following is correct? 2026 Full General Science list All NDA PYQs