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MCAT Physics Mcq Questions Electromagnetism

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1. Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called




2. A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is




3. What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N?




4. When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius




5. Two parallel wires carrying currents in the opposite directions




6. A magnetic compass will be deflected if it is kept near a




7. A magnetic field




8. A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it?




9. Which one of the following material is most suitable for making core of an electromagnet?




10. The magnetic force experienced by a charge particle moving in a magnetic field will be minimum when it move




11. The relationship between Tesla and smaller unit Gauss of magnetic induction is given by




12. If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is




13. SI unit of flux density is




14. Magnetic flux and flux density are related by




15. The standard vector symbol for flux density is




16. The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be




17. An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if




18. Value of permeability of tree space in SI units is




19. The magnetic field strength of solenoid is




20. An instrument which can measure potential without drawing any current is




21. The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12?. Galvanometer resistance is




22. When the coil of the galvanometer is in equilibrium then the deflecting couple is




23. The sensitivity of a galvanometer is given by




24. Which one of the following is not an electromechanical instrument?




25. Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is




26. In a multi range ammeter as the range increases




27. While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when




28. A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is




29. An ammeter measures the total current flowing through a circuit when it is connected




30. Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always




31. A galvanometer basically is an instrument used to




32. The effective way to increase the sensitivity of a moving coil galvanometer is to




33. A wheat stone bridge is said to be balanced when




34. When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is




35. A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is




36. Galvanometer is a very sensitive device with




37. Which one of the following methods would be able to increase the sensitivity of a moving coil galvanometer ?




38. Heating a magnet will




39. If a current carrying solenoid is suspended freely it will




40. Which of the following substances posses the highest elasticity?




41. What is the SI unit of modulus of elasticity of substance?




42. What are the dimensions of stress?




43. The figure shown the stress-strain graph of a certain substance. Over which region of the graph is Hooks law obeyed?




44. Which one of the following physical quantities does not have the dimensions of force per unit area?




45. A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber?




46. A ire of length L is stretched by a length ? when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is




47. When a force is applied at one end of an elastic wire it produces at strain ? in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by




48. A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire?




49. A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by




50. A uniform steel wire of length 4m and area of cross-section 3x10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2x1011 Nm-2 the energy stored in the wire is