Chapter-wise Test: Unit 06-Work and Energy Name: __________ Roll No: __________ Total Time: 40 min Total marks: [ /25] Objective Section Marks: [ /03] Q.1 Encircle the correct option i.e. A/ B/ C/ D. Each part carries one mark. i. Unit to calculate power of a body is: A. Js−1 B. Js−2 C. Js2 D. Nm2 ii. The work done will be zero when the angle between the force and distance is: A. 45o B. 60o C. 90o D. 180o iii. One horse power is equal to ________ watt. A. 749 B. 764 C. 746 D. 794 PART-I-Short Question(s) Marks: [ /12] Q.2 Attempt the following questions. i. Define potential energy. Also give any two examples of potential energy. (03) ii. What is meant by efficiency of a system? (03) iii. A man has pulled a cart through 35 m applying a force of 300 N. Find the work done by the man. (03) iv. What do you know about mass energy equation? (03) PART-II-Subjective Section Marks: [ /10] Attempt any ONE question. Q.3 (a) Define kinetic energy. Derive a relation to calculate kinetic energy of a body. (06) (b) A block weighing 20 N is lifted 6 m vertically upward. Calculate the potential energy stored in it. (04) Q.4 (a) Write a note on the following major sources of energy: i. Fossil fuels ii. Energy from water (06) (b) A man pulls a block with a force of 300 N through 50 m in 60 s. Find the power used by him to pull the block. (04)
Chapter-wise Test: Unit 06-Work and Energy Solution for Objective type of EOU test *Note: Consult the textbook for answers. Objective Section Marks: [ /03] i. A ii. C iii. C