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G.K Question and Answer - Physics Set VI

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1. What is a long coil containing a large number of close turns of insulated copper wire called?




2. The magnetic field produced by a current carrying solenoid is similar to the magnetic field produced by a:




3. The magnetic field lines inside the solenoid are:




4. What is used to make electromagnets?




5. On what does the strength of magnetic field produced by a current carrying solenoid depend?




6. An electromagnet consists of a long coil of insulated copper wire wound on a soft:




7. Which of the following is not used for making electromagnets?




8. Which of the following factors affects the strength of steel?




9. Strong permanent magnets are used in:




10. Which effect of current is used in detecting concealed current-carrying conductor in a wall?




11. Which are the two main organs of the human body where the magnetic field produced is significant?




12. Who discovered that when a current carrying conductor is placed in a magnetic field, a mechanical force exerted on the conductor makes it move?




13. The maximum force is exerted on a current carrying conductor when it is:




14. Which rule is applied to find the direction of force acting on the current-carrying conductor, if the direction of current and direction of magnetic field is known?




15. Which direction is indicated by the thumb in Fleming’s left-hand rule?




16. What does the forefinger represent in the Fleming’s left-hand rule?




17.  The direction of deflection of a current-carrying conductor indicates the direction of:




18. Which device converts electrical energy into mechanical energy?




19. In which of the following devices is the electrical motor used?




20. In an electric motor, which device reverses the direction of current through a circuit?




21. The carbon strips used to pass electric current to the coil are known:




22.  Which metal wire is used in the coil of the motor used commercially?




23. The production of electricity from magnetism is called:




24. The current produced by moving a straight wire in a magnetic field is called:




25. Who discovered the phenomenon of electromagnetic induction?




26. The process of electromagnetic induction has led to the construction of:




27. What needs to be reversed in order to reverse the direction of induced current?




28.  Magnitude of current induced in the coil can be increased by increasing:




29.  The production of electric current by moving a magnet inside a fixed coil of wire is a case of:




30. What is the current flowing in one direction called?




31.  Which of the following are sources of direct current?




32. If the current reverses direction after equal intervals of time, it is called:




33. At what time interval does the alternating current produced in India reverse its direction?




34. Which of the following are the sources for producing alternating current?




35. Which of the following convert’s mechanical energy into electrical energy?




36.  What is the frequency of alternating current produced in India?




37. In generators, the voltage produced can be increased by:




38. Which of the following parts of the generators is stationary to produce electricity in large powerhouses?




39. Which of the following parts is not there in A.C. generator?