There are factors that affect resistance of the filament (conductor): length cross-sectional area Resistivity For our syllabus, brightness of the bulb depends on power. The higher the power, the brighter the bulb. e.g. a 100 W bulb is brighter than a 60 W bulb, View the video to understand the concepts better Video

For Science Physics, you just need to the I-V graphs of ohmic conductor e.g fixed resistor and non-ohmic conductor e.g. filament bulb/lamp. For Pure Physics, all the 4 components are needed.

If you consider the composite rod as a whole, the centre of gravity CG is at the pivot. The line of action of the weight which acts from the CG passes through the pivot at P, there is no perpendicular distance, hence no moment created. Thus the rod is balanced at P. But to solve this question, you need to consider the weight of plastic and weight of wood separately in order to find the ratio and apply the Principle of Moments to solve it.

As the reference height is at B, so above that reference height is considered positive, and below the reference height it is considered negative. Hence the height-time graph is as such. Consider a vertical oscillating object, similar to the simple pendulum, the middle is the fastest.

Answer: Option C View the video for explanation

Answer: Option A View the video for explanation

Answer: Option D View the video for explanation

Answer: Option A Many have the misconception that as the astronaut and camera are floating and weightless, there is no gravitational force acting on them. Actually both are inside the gravitational field of the Earth, and there is gravitational field strength, hence there is gravitational force acting on them towards the Earth. But as together with the station, they are all ‘free falling’, hence no normal contact force on the astronaut and camera, hence give the feeling of weightlessness. View the video for the explanation.

To get a sharp image on the screen, there are various methods and concepts that you have learned and can be applied here. View the video for the explanation:

The diagram of circuit breaker may vary. So it is important that you analyse the structure of the circuit breaker in the diagram to understand how it works. The following are two examples of circuit breaker where the structures are different, but the basic working principles are the same. Video explanation part 01: 2022PPp2q10 2022PPp2q10 Suggested answers: Video explanation part 02: 2024PPp2q11 2024PPp2q11 Suggested answers:

There is a related question in Pure Physics 2021 P2 Q9, but slightly different. It asked about why home circuit of 230V is not suitable to power a fast charger like those big size DC charger we see in industrial or shopping malls carpark.