Solutions of Sources of Energy (Page No- 123) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

Class 10 Physics Solutions By Lakhmir Singh & Manjit Kaur

Created by: Ajay Batra

Class 10 : Solutions of Sources of Energy (Page No- 123) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

The document Solutions of Sources of Energy (Page No- 123) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev is a part of the Class 10 Course Class 10 Physics Solutions By Lakhmir Singh & Manjit Kaur.
All you need of Class 10 at this link: Class 10

Lakhmir Singh Physics Class 10 Solutions Page No:123

Question 30: The calorific values of three fuels A, B and C are 33 kj/g, 48 kj/g and 150 kj/g, respectively. A is solid, B is liquid and C is a gas at room temperature. On combustion, both A and B produce carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal ? 

Solution : Fuel B is the most ideal fuel because.
(i) it leaves no residue on burning.
(ii) it has high calorific value of 48 kJ/g.
(iii) it does not burn explosively.

Question 31: Calorific value and ignition temperature of fuel X are 75 kj/g and 20°C respectively. These values for fuel Y are 50 kj/g and 75°C respectively. On burning, the fuel Y produces only CO2 while fuel X produces COand CO. Which of the two is a better fuel ? 

Solution : Fuel Y is a better fuel because
(i) it has a moderate ignition temperature of 75oC.
(ii) it produces no harmful gases like CO on burning.

Question 32: The calorific values of five fuels A, B, C, D and E are given below :
 A. 48 kj/g
 B. 17 kj/g
 C. 150 kj/g
 D. 50 kj/g
 E. 30 kj/g

Which of the fuels could be : (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene ?

Solution : (i) cooking gas – D
(ii) alcohol – E
(iii) wood – B
(iv) hydrogen – C
(v) kerosene – A

Question 33: Arrange the following fuels in the order of decreasing calorific values (keeping the fuel with highest calorific value first) :
 Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane

Solution : Hydrogen gas>Methane>Petrol>Kerosene>Biogas>Wood

Question 34: Arrange the following fuels in the order of increasing calorific values (keeping the fuel with lowest calorific value first) :

LPG, Coal, Alcohol, Dung cakes, Diesel

Solution : Dung cakes<Coal<Alcohol<Diesel<LPG

Question 35: Most of the fuels contain carbon as one of the constituents. Name a fuel which has very high calorific value but does not contain carbon.

Solution : Hydrogen gas.

Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

Complete Syllabus of Class 10

Dynamic Test

Content Category

Related Searches

Solutions of Sources of Energy (Page No- 123) - Physics By Lakhmir Singh

,

practice quizzes

,

pdf

,

study material

,

Previous Year Questions with Solutions

,

Extra Questions

,

Free

,

Sample Paper

,

Solutions of Sources of Energy (Page No- 123) - Physics By Lakhmir Singh

,

Important questions

,

Viva Questions

,

Class 10 Class 10 Notes | EduRev

,

mock tests for examination

,

video lectures

,

Semester Notes

,

Class 10 Class 10 Notes | EduRev

,

Exam

,

Objective type Questions

,

ppt

,

shortcuts and tricks

,

Solutions of Sources of Energy (Page No- 123) - Physics By Lakhmir Singh

,

Class 10 Class 10 Notes | EduRev

,

Summary

,

past year papers

,

MCQs

;