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- Which bulb X or Y is brighter, and which has higher resistance?
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
- I-V graphs of various components
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.
- Find the ratio of mass of the wooden section to the plastic section of a composite rod pivoted at P
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.
- Various graphs of a simple pendulum and vertical oscillating object
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.
- 2016 PPP1Q3 Initial acceleration and terminal velocity of heavier object
Answer: Option C View the video for explanation
- Keeping the square wooden plane in equilibrium
Answer: Option A View the video for explanation
- Pendulum - What is the period based on the height-time graph
Answer: Option D View the video for explanation
- 2016PPP1Q5 Camera in space station orbiting the Earth
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.
- How to make the image formed on the screen sharp?
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:
