# WBJEE: Important Questions and Preparation Tips – Work, Power and Energy

The chapter Work, Power and Energy is a very important topic of Mechanics in WBJEE Examination 2018. In this article we bring to you the complete chapter notes of chapter Work, Power and Energy including topics like work, work done by a variable force, conservation of Mechanical Energy, Potential Energy of a string, power etc. These chapter notes are prepared by Subject Expert and are based on the latest syllabus of WBJEE Examination. These notes also include some previous year solved questions which will help you to understand the difficulty level of questions asked in previous year WBJEE Examinations. These notes are in very concise form and can be used for quick revision before the examination. This article will definitely help you to score full marks in this topic in WBJEE Examination 2018.

WBJEE Physics Syllabus: 2017 - 2018

West Bengal Joint Entrance Examination (WBJEE) is a state level common entrance test organized by West Bengal Joint Entrance Examinations Board for admission to the Undergraduate Level Engineering and Medical Courses through a common entrance test in the State of West Bengal.

Important concepts:

Important Questions and Preparation Tips – Laws of Motion

Question 1:

Work done for a certain spring when stretched through 1 mm is 10 Joule. The amount of work that must be done on the spring to stretch it further by 1 mm is

(a) 30 J                                        (c) 10 J

(b) 40 J                                        (d) 20 J

Solution 1:

Hence, the correct option is (a).

Important Questions and Preparation Tips - Thermodynamics

Question 2:

Solution 2:

Important Questions and Preparation Tips – Kinematics

Question 3:

A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration ac, is varying with time t as ac = k2rt2 , where k is a constant. The power delivered to the particle by the forces acting on it is
(a) Zero                                           (b) mk2r2t2
(c) mk2r2t                                         (d) mk2rt

Solution 3:

Question 4:

Solution 4:

Engineering Entrance Exam Calendar 2018: Important Dates

JEE Advanced 2018 website launched by IIT Kanpur for computer based exam on 20 May: Are you ready?

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