Physics Past Questions and Answers

<img src='https://www.schoolngr.com/eattachments/88313388eb2ae9baf4549b6a4938628e46c9342a' width='300'/><br/>The figure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40\(^o\), then the value of W is

<img src='https://www.schoolngr.com/eattachments/43f40c75143370cd2f275cefe7a77f46d4f19461' width='300'/><br/>In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80\(^o\)C is known as the

<img src='https://www.schoolngr.com/eattachments/3580c26c9f37022475a094f5b6187acfe436a2af' width='300'/><br/>In the figure, the value of R is

Which of the following instruments consumes the highest current?<br/><table class='tbn'><tr><td> I. Electric iron </td><td> 250v </td><td> 1kW </td></tr><tr><td> II. Television set </td><td> 220v </td><td> 110W </td></tr><tr><td> III. Torch light </td><td> 6v </td><td> 30W </td></tr><tr><td> IV. Immersion heater </td><td> 110v </td><td> 500W </td></tr></table>

<img src='https://www.schoolngr.com/eattachments/e8873e71112aaba7b6c26e0c0f0208822cc95e2a' width='300'/><br/>In which of the following diagrams is the length of the tube equal to one wavelength?