Girish had three rods made of different materials. He labelled them, X, Y and Z. He placedthem in the threedifferent positions, P, Q and R, as shown in the circuit below.He recorded the results of theexperiment in the table below. When any of the bulbs, B1, B2 or B3, lit up during theexperiment, he marked it with a tick (P) in the box.Based on the result givenabove, which classification of the materials, X, Y and Z, according to their electricalconductivity is correct ?A. 1B. 2C. 3D. 4

Sam made some electrical circuits using identical lamps and batteries. Assist Sam to determine which circuithas the smallest current and which circuit has the brightest lamps respectively.A BC D(1) A and D (2) B and D (3) A and B (4) C and D

Use the correct answer from the box to complete each sentence.a filament bulb an LED an LDRAn electrical component which has a resistance that increases as thetemperature increases is .................................................. .An electrical component which emits light only when a current flows through itin the forward direction is ..................................................

In an electrical circuit three incandescent bulbs A, B and C ofrating 40 W, 60 W and 100 W are connected in parallel to anelectric source. Which of the following is likely to happen regardingtheir brightness?

In an electrical circuit three incandescent bulbs A, B and C of rating40 W, 60 W and 100 W respectively are connected in parallel to anelectric source. Which of the following is likely to happen regardingtheir brightness?(a) Brightness of all the bulbs will be the same(b) Brightness of bulb A will be the maximum(c) Brightness of bulb B will be more than that of A(d) Brightness of bulb C will be less than that of B

Describe how the student could use her circuit to investigate how the currentthrough a filament lamp affects its resistance