i) State the law of conservation of energy

ii) Name the chief energy transformation that occurs,

1. In a loudspeaker,

i) Define an inclined plane

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)

24.

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

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.

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?

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

i) State the function of a split ring in a D.C. motor.