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Physics Difficult Questions with complete solution

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  • PHYSICS

Physics Difficult Questions with complete solution Physics Difficult Questions - Count clicks - Measure background radiation - Safety precaution [tongs] - Repeat - Mention Bq - correct answer How should you measure the activity of a radioactive source using a GM detector? - Prevents e...

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  • October 19, 2024
  • 34
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • physics difficult questions
  • physics difficult questions with complete solution

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  • PHYSICS
  • PHYSICS

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Physics Difficult Questions
- Count clicks
- Measure background radiation
- Safety precaution [tongs]
- Repeat
- Mention Bq - correct answer ✔How should you measure the activity of a
radioactive source using a GM detector?


- Prevents electrocution
- Current goes to earth, not user - correct answer ✔How does an earth
connection protect the user?


- Particles move apart
- Particles gain KE
- Particles move more freely
- Particles leave the liquid to become a gas - correct answer ✔What happens
when a liquid boils to form a gas?


- No particles
- So poor conduction - correct answer ✔How does a vacuum reduce thermal
energy transferred to ____?


- Cold air above liquid
- Air in room is warmer
- Convection currents in the air are unlikely - correct answer ✔Suggest why a
lid was not needed for ____?

,- Centre of gravity closer to front of lorry
- Clockwise and anti-clockwise moments are equal
- Increase in force related to decrease in distance - correct answer ✔Use
ideas about moments to explain why force B (front wheel of a lorry) increases
when the load slides to the front.


- A sequence ROYGBIV
- Colour related to wavelength. Red longest - correct answer ✔What is a
visible spectrum?


- High voltage = Low current
- Less energy is lost
- More efficient
- P=IV
- Can use thinner wires - correct answer ✔Explain why electrical energy is
transmitted using a very high voltage.


- A current that changes direction continuously - correct answer ✔What is an
alternating current?


- Transformers need an alternating current
- Transformers change the voltage - correct answer ✔Explain why the d.c.
From the generator must be changed to a.c. Before it is transmitted.


- Magnetic field around rod
- There is force on the rod
- Causing movement of the rod

,- Out of the paper - correct answer ✔A metal rod is placed in a magnetic
field, and there is a current flowing


Describe the effect on the rod.


- Less mass
- Less fuel required
- Less work done
- Mass and acceleration are inversely related
- Less air resistance - correct answer ✔The caravan is removed from a car.
Without the caravan, the car has greater acceleration and uses less fuel.
Explain.


- Lost as heat energy - correct answer ✔As it flies, the paper aeroplane loses
gravitational potential energy. What happens to this energy?


- Critical angle is smaller than in a diamond
- Calculation - correct answer ✔Explain why Ray's of light inside a diamond
are more likely to be totally internally reflected than those indies an opal.


- To increase the rate of fission - correct answer ✔What is the purpose of the
moderator in a reactor?


- Rate of reaction increases
- Temperature increases
- Fewer reactions - correct answer ✔Describe what happens in the reactor
when a control rod is removed.

, - Harmful nature of radiation
- High activity level
- Long half life
- Difficult for emergency workers to access area
- Extensive time
- Materials mixes with the environment - correct answer ✔Explain why it is
difficult to make the surrounding area safe again after a serious nuclear
accident.


- Equal pressure
- Pressure difference
- Pressure causes force on water
- P=F/A
- Pressure acts in all direction - correct answer ✔Explain why the water
starts to flow and then stops.


- Place compass next to magnet and look where the needle points
- line marked using pencil and paper method
- This is repeated for another line in a different place - correct answer
✔Describe how you should uses a bar magnet and compass to investigate the
magnetic field pattern of the bar magnet.


- Electricity transfer
- Due to friction - correct answer ✔Explain how an aircraft can become
electrically charged while it is flying.


- Digital - Toggle off and on

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