A machine lifts a load of 200 N when an effort of 50 N is applied. What is the mechanical advantage of the machine ?

Work, Energy & Power — UPSSSC PET Preparation

This question tests your understanding of Work, Energy & Power, a key topic in the UPSSSC PET General Knowledge section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.

This topic covers work and its units, kinetic and potential energy, the law of conservation of energy, energy conversions in everyday devices, power and its units, and simple machines. Questions usually ask about energy conversions (a battery converts chemical energy into electrical energy, and an electric motor converts electrical energy into mechanical energy), the unit of power (the watt), and how one horsepower relates to watts (about 746 W). Remember that no work is done when the displacement is zero or perpendicular to the force. Practise the work, energy and power questions below, written in the style of the general awareness sections of exams such as SSC, banking, railways, CUET GAT, MAH CET and CLAT. Each question comes with a detailed explanation that adds related facts, so every question helps you revise more than one point.