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CHAPTER 15

ELECTROMAGNETISM    

Encircle the most appropriate answer from the following options


l .         is a study of magnetic effects of current 

(a) Electrostatics

(b) Electricity

(c) Electromagnetism

(d) Electronics 


2.        Who discovered that when current passes through a conductor it produces a magnetic field around it

(a) Lenz

(b) Coulomb

(c) Ampere

(d) Faraday 


3.        When current passes through straight conductor it produce magnetic field in the form of

(a) Straight line           

(b) Concentric circles

(c) Rectangular form

(d) Parabolic shape


4.         The magnetic field produced in straight current carrying conductor will stronger

(a) Near pole  

(b) Near current carrying conductor

(c) Away from current carrying conductor

(d) None of these


5.           The magnetic field received from the electrical conductor is weaker.

(a) Near pole  

(b) Near current carrying conductor

(c) Away from current carrying conductor

(d) None of these


6.     Weak iconic current that travel along the nerve can produce the

(a) Electric effect

(b) Mågnetic effect

(c) electric and magnetic effects

(d) None of these


7.         MRI stands for:

(a) Mågnetic resonance imagining

(b) Mågnetic resistance and current

(c) Mågnetic resistance imagining

(d) None of these


8.         The magnetic lines of force can be traced on cardboard on using:

(a) Cardboard

(b) compass needle

(c) paper

(d) magnet


9.         Shape of Magnetic lines of force in straight conductor

(a) Straight

(b) Elliptical

(c) circular

(d) All of these


10.          Direction of magnetic force in straight conductor is :

(a) Right hand rule

(b) Left hand rule

(c) Both a & b.

(d) None of thenl


l l . If the current is flowing from bottom end to top then the direction of magnetic lines of force will be:

(a) Anti-clockwise

(b)  Clockwise

(c) Straight     

(d) None of them


12.       If’ the current is flowing from top to bottom then the direction of magnetic lines of force will be:    

(a) Anti-Cloclovise     

(b) Clockwise

(c) Straight

(d) None of these


13.         A dot (•) on paper indicates that the current is directed:

(a) out of Plane         

(b) toward us  

(c) Into the Plane

(d) Both a & b


14.       Cross(x) on paper indicates that the current is directed:

(a) Out of plane          

(b) Away from us       

(c) Into the Plane

(d) None of these


15.       Magnetic field in most part of the coil is:

(a) Circular    

(b) Straight     

(c) Uniform

(d) Non-Uniform 


 16. A closely wound cylindrical coil of insulated wire is known as: 

(a) Cylindrical coil

(b) Solenoid

(c) Cable

(d) All of them


17.       Magnetic lines of force in solenoid are: 

(a) Circular     

(b) Parallel     

(c) Non-Uniform        

(d) Uniform


18.       Lines of force in solenoid resemble the pattern of lines of force due to:

 (a) Electromagnet     

(b) Horse shoe magnet

(c)Bar magnet          

(d) All of them


19.       The polarity of current carrying solenoid is found by:

(a) Right Hand Rule

(b) Left Hand Rule     

(c) Both a & b 

(d) None of them


20.       Hold down the end of the current carrying solenoid in front of you, if the direction of current flow through this end is anti-clock wise it would be:

(a) North Pole           

(b) South Pole

(c) any of them          

(d) None of them


21.       Hold down the end of the current carrying solenoid in front of you, if the direction of current flow through this end is clockwise it would be:

(a) North Pole

(b) South Pole

(c) Any of them          

(d) None of them


 22.      Force on current carrying.conductor in a magnetic field is found by:

 (a) Right Hand Rule

(b) Left Hand Rule    

(c) Both a & b 

(d) None of them


23.       A tool which is used to convert electrical energy into mechanical energy:

(a)Transformer          

(b) A.C Generator      

(c) D.C Motor

(d) All of them


24.       Electromagnetic induction was discovered by:

(a) Newton     

(b) Galileo      

(c) Einstein     

(d) Faraday


25.       Who found the direction of induceå e.m.f the first time?

(a) Faraday    

(b) Lenz         

(c) Henry        

(d) Bohr


26.       The worth of induced emf is directly proportional to the rate of change bf:

(a) Current     

(b) Resistance

(c) Potential    

(d) Flux


27.       The number of magnetic lines of force passed through any surface will

(a) emf

(b) Current     

(c) Flux          

(d) Resistance


28.       The magnitude of induced emf depends upon the speed of:

(a) Magnet     

(b) Coil

(c) Current     

(d) relative Mötion


29.       A tool used to convert mechanical energy into electrical energy:

(a) Transformer         

(b) A.C Generator      

(c) D.C Motor

(d) All of them


30.       A generator works on the principle of:

(a) Electromagnetic induction        

(b) Electrostatic induction

(c)Both of them          

(d) None of these


31.       If the Current is induced in n circuit due to change of current in an other circuit, this process is known as:

(a) electrostatic induction

(b) mutual induction

(e) self induction

(d) none of them        


32.       The coil of transformer in which change in current produces induced current in another coil is known as:

(a) Primary

(b) Secondary

(c) Solenoid

(d) All of them


33. A coil in which current is induced is known as:

(a) Primary     

(b) Secondary           

(c) Solenoid    

(d) All of them


34. If the current through a coil or a circuit changes and this change induces an emf in   the circuit itself, this process is known as:

(a) electrostatic induction

(b) mutual induction

(c) self induction

(d) none of them


35.       An electrical device which is used to increase or decrease the value of alternating   voltage:

(a) Transformer        

(b) A.C Generator      

(c) DC Motor  

(d) All of them\


36. The coil which is connected to the alternating voltage whose value is to be altered is known as:

(a) Primary Coil        

(b Secondary Coil.     

(c) Solenoid    

(d) All of them


37.       The Coil of transformer in which alternating voltage is induced is known as:

(a) Primary Coil         

(b) Secondary Coil   

(c) Solenoid    

(d) All of them


38.       Transformer works on the principle of:

(a) Electrostatic induction      

(b) Mutual Induction

(c) Self Induction       

(d) All of them


39.       Type of transformer which is used to increase the value of alternating voltage:

(a) step up     

(b) step down 

(c) step forward         

d step back    


40.       Type of transformer which is used to decrease the value of alternating voltage:    

(a) step up      

(b) step down

(c) step forward         

(d) step back


41.       When a straight current carrying conductor is placed in a magnetic field at right angle to it, the direction of force acting on conductor is:

(a) Same as the direction of field      

(b) Opposite to the direction of the field

(c) Makes an angle of 450 with the current (d) At right angle to both the field and current


42.       A transformer has 100 turns in primary and 500 turns in the secondary. If 6 Volts  D.C is applied across its primary, the voltage Induced across its secondary would be:

(a) OV

(b) 30V           

(c) 45V

(d) 60V           


43.       Walk through metal detector are installed at airport and other places for

(a) Security purpose

(b) Decoration

(c) Useless purpose   

(d) All of these


44.       practical application of mutual induction is:

(a) Transformer        

(b) Electrical   

(c) Generator 

(d) Diode


45.       Number of turns on the primary coil is represented as:

(a) Ns

(b) Np

(c) Ns

(d) Na


46.       Number of turns on secondary coil is

(a) Ns

(b) Nd

(c) Na

(d) Np


 47.      In step-up transformer:          

(a) Vp > Ns

(b) Up > Vp

(c) Vs > Vp

(d) Vs > Ns


48.       Transformer is called step-down when:

(a) Vs > Vp

(b) Vs > NS

(c) Vp < Vs

(d) Vs < Vp


49. Electric power is usually generated at places which are far from the places where it is:

(a) Consumed

(b) Produced

(c) Not needed

(d) Developed


50.       Voltage of current supplied to consumers is:

(a) 230 V        

(b) 240 V        

(c) 210 V        

(d) 220 V


 51.      Electromagnet is used in device

(a) Electric bell           

(b) Relay

(c) Both A s and B   

(d) Thermometer


52.       Which is an electric switch that opens and closes under the control of another

(a) Relay

(b) Electric bell

(c) Electric circuit

(d) A. C generator