Short Answer Typei) Why does a magnetic needle show a deflection when brought close to a current carrying conductor.
ii) A wire bent into a circle carries current in an anti-clockwise direction. What polarity does the face of the coil exhibit?i) It is because the current carrying coil produces magnetic field around it.
ii) North pole is exhibited.
A certain quantity of ice at 0oC is heated till it changes into steam at 100o C. Draw a time-temperature heating curve to represent it. Label the two phase changes in your graph.
i) Define the heat capacity of a given body. What is its SI unit?
ii) what is the relation between heat capacity and specific hear capacity of a substance.i) When does the nucleus of an atom become radioactive?
ii) How is the radioactivity of an element affected when it undergoes a chemical change to form a chemical compound?
i) Mention one use and one harmful effect of radioactivity.
ii) Give one source of background radiation.
Long Answer Typei) Draw a labelled diagram of a block and tackle system of pulleys with two pulleys in each block. Indicate the directions of the load, effort and tension in the string.
ii) Write down the relation between the load and the effort of the pulley system.i)
Draw a labelled ray diagram to illustrate (1) critical angle (2) total internal reflection, for a ray of light moving from one medium to another.
i)
The diagram alongside shows a ray of light incident on an equilateral glass prism placed in minimum deviation position.
Copy the diagram and complete it to show the path of the refracted ray and the emergent ray.
ii) How are angle of incidence and angle of emergences related to each other in this position of the prism?
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