State any three sources of error in meterbridge experiment and steps to be taken to minimise them.

State what precautions must be taken while performing experiment with potentiometer.

State the three equations of motion and give the relationship explained bt them.

Three distinct points A, B and C are given in the 2-dimensional coordinate plane such that the ratio of the distance of any one of them from the point (1, 0) to the distance from the point (-1, 0) is equal to 1:3. Then the circumcentre of the triangle ABC is at the point

Solve any three sub questions from the following : Take any four points such that three of them are collinear. Draw lines passing through the pairs of points.

Answer the following When resistors are connected in series, they are connected one after another. If any one of them does not function, the circuit breaks and there is no flow of electricity. If two give less individually. If three bulbs are connected in series, their light output will decrease further. Think about it: What is the reason behind this?

Answer the following questions:Make two sufficiently long, identical tubes out of a cardboard. Arrange them on a table, in front of a wall as shown in figure . Place a clock near the end of one of the tubes and try to hear the ticking of the clock at the end of the other tube by placing your ear there. Adjust the angles of the two tubes till you can hear the sound very clearly Measure the angle of incidence theta_1 and the angle of reflection theta_2 . Try to see if they are related in any way. In the experiment, what will happen if you lift one of the tubes to some height?

Three boys and three girls are to be seated around a table in a circle. Among them, the boy X does not want any girl as neighbour and girl Y does not want any boy as neighbour. How many such distinct arrangements are possible?

Answer the following question: State any three characterstic properties of beta rays.