Short Answer Typei) State the law of conservation of energy
ii) Name the chief energy transformation that occurs,
1. In a loudspeaker,
2. In an electrical cell (Primary)i) Define an inclined plane
ii) Draw a labeled sketch of a class II lever. Give one example of such a lever.Water falls from a height of 50 m. Calculate the rise in temperature of water when it strikes the bottom.
(g = 10 m/s2; Specific heat capacity of water = 4200 J/kg oC)
Draw a labeled diagram of a common hydrometer and state the principle used in it’s working?
The ray diagram given below illustrates the experimental setup for the determination of the focal length of a converging lens using a plane mirror.
i) State the magnification of the image formed.
ii) Write two characteristics of the images formed
iii) What is the name given to the distance between the object and optical center of the lens in the alongside diagram?i) A glass slab is placed over a page on which the word VIBGYOR is printed with each letter in its corresponding color.
1. Will the image of all the letters be in the same plane?
2. If not, state which letter will be raised to its maximum. Give a reason for your answer.
ii) What will be the color of an object, which appears green in white light and black in red light?i)
1. No, the image of all letters will not be at the same place.
2. Letter V will be raised maximum. This is because the refractive index of a material depends inversely upon the wavelength of light. On the other hand the shift in the image depends directly on the refractive index. Since, the refractive index of a material is maximum fr violet light, therefore letter V which is written with violet colour is raised the maximum.
ii) Green will be the actual color of an object.
A radar is able to detect the reflected waves from an enemy aero plane, after a time interval of 0.02 milliseconds. If the velocity of the waves is 3 x 108m/s, calculate the distance of the plane from the radar.
A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph alongside:-
i) What are represented by AB and CD?
ii) What conclusion can you draw regarding the nature of ice from the alongside graph?An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains.
Calculate:
i) The current drawn?
ii) The electrical energy consumed in 60 hours
The cost of electrical energy consumed at Rs. 2.50 per kWh.i) State the function of a split ring in a D.C. motor.
ii) Mention two reasons why a soft iron core is used within the coil of a moving coil galvanometer?
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