Classes

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Class 9Class 10First YearSecond Year

Math

Physics

01Physical Quantities and Measurement

672 Doubt Solutions

02Kinematics

1344 Doubt Solutions

03Dynamics

2016 Doubt Solutions

04Turning Effect of Forces

2688 Doubt Solutions

05Gravitation

3360 Doubt Solutions

06work And Energy

4032 Doubt Solutions

07Properties of matter

4704 Doubt Solutions

08Thermal Properties of Matter

5376 Doubt Solutions

09Transfer of Heat

6048 Doubt Solutions

Chemistry

2. How much work is needed to move horizontally a body 20 \mathrm{~m} by a force of 30 \mathrm{~N} the angle between the body and the horizontal surface is 60^{\circ} ?

$b) The energy of 600 \mathrm{~J} dissipated by a bulb in 50 minutes. Find the power of the bulb.$

$4. A body of mass 1 \mathrm{~kg} is lifted through a height of 1 \mathrm{~m} . The energy possessed in the body will be (consider g=10 \mathrm{~ms}^{-2} )a) 1 \mathrm{~J} b) 10 Joulec) 100 Jouled) 1000 Joule$

$10. Write notes on Tidal energy and Geothermal energy.$

$9.6 Why transfer of heat in fluids takes place by convection?$

$9.2 Why metals are good conductors of heat?$

$9.3 Explain why:(a) a metal feels colder to touch than wood kept in a cold place?$

Class 9 Physics Transfer of Heat