7th Class Science Light Question Bank

done Electricity And Light Total Questions - 40

• question_answer1)
  An instrument that automatically stops the current in a circuit if the current in it exceeds the specified maximum limit.
  A)
  Positive terminal done clear
  B)
  MCB done clear
  C)
  Negative terminal done clear
  D)
         ISI done clear
  E)
  None of these done clear
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• question_answer2)
  Which of the following statements will be true for the given circuit, when the switch will be on?
  A)
  Lamp 3 will glow first.     done clear
  B)
  Lamp 1 will glow first. done clear
  C)
  Lamp 1 and 2 will glow together and lamp 3 will glow later. done clear
  D)
  All the lamps will glow together done clear
  E)
  None of these done clear
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• question_answer3)
  Short wire has ____ whereas long wire has ____ resistance.
  A)
  More, less                      done clear
  B)
  Less, no done clear
  C)
  Less, more         done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer4)
  A circuit diagram which includes a battery of 3 cells, a bulb and an open switch is:
  A)
  done clear
  B)
  done clear
  C)
    done clear
  D)
  done clear
  E)
  None of these done clear
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• question_answer5)
  Nichrome is an alloy of:
  A)
  Chromium                     done clear
  B)
  Iron done clear
  C)
  Nickel    done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer6)
  Element of electric iron become red-hot on passing current because:
  A)
  Colour of element is red. done clear
  B)
  It has very high resistance. done clear
  C)
  It has a thick wire. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer7)
  "A wire carrying an electric current possesses a magnetic field around it" was concluded by:
  A)
  Charles Darwin done clear
  B)
         Galileo Galilei done clear
  C)
  H.C. Oersted      done clear
  D)
         Albert Einstein done clear
  E)
  None of these done clear
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• question_answer8)
  Electric fuse is used to protect household electric appliances from accidental:
  A)
  Small flow of current       done clear
  B)
  Large flow of current done clear
  C)
  No flow of current           done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer9)
  When a switch is in ON position,

  (i) Circuit is open

  (ii) Circuit is closed

  (iii) Current is flowing in the circuit

  (iv) No Current is flowing through it

  Choose the correct combination of answer for the above information.
  A)
  (i) and (ii)                       done clear
  B)
  (ii) and (iii) done clear
  C)
  (iii) and (iv)        done clear
  D)
         (i) and (iv) done clear
  E)
  None of these done clear
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• question_answer10)
  More heat is produced in an electric circuit when:
  A)
  Magnitude of current is increased. done clear
  B)
  Wire with greater resistance is use. done clear
  C)
  Bulb with broken filament is used. done clear
  D)
  Both [a] and [b] done clear
  E)
  None of these done clear
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• question_answer11)
  Thickness of wire used in working circuit M is more than the thickness of wire used in circuit N. Which of the following options is correct?
  A)
  More heat will be produced in circuit M than circuit N. done clear
  B)
  More heat will be produced in circuit N than circuit M. done clear
  C)
  Equal amount of heat will be produced in both the circuits. done clear
  D)
  No heat will be produced. done clear
  E)
  None of these done clear
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• question_answer12)
  A solenoid acts as a ___ when electric current passes through it.
  A)
  Resistor              done clear
  B)
  Bar magnet done clear
  C)
  Insulator            done clear
  D)
         Electric torch done clear
  E)
  None of these done clear
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• question_answer13)
  A circuit in which current is flowing, consists of a steel spoon coiled with copper wire, when some allpins are brought near this spoon, the allpins get attracted due to:
  A)
  Heating effect of current done clear
  B)
  Chemical effect of current done clear
  C)
  Magnetic effect of current done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer14)
  ____ is a magnet produced by electric current.
  A)
  Bar magnet                    done clear
  B)
  Permanent magnet done clear
  C)
  Electromagnet    done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer15)
  Current means:
  A)
  Flow of protons in the circuit. done clear
  B)
  Flow of neutrons in the circuit. done clear
  C)
  Flow of electrons in the circuit.    done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer16)
  ___ is measured by voltmeter.
  A)
  Current              done clear
  B)
  Resistance done clear
  C)
  Potential difference          done clear
  D)
  Magnetism done clear
  E)
  None of these done clear
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• question_answer17)
  Which is the commercial unit of electrical energy?
  A)
  \[Joule/s\]                       done clear
  B)
  Kilowatt done clear
  C)
  Joule     done clear
  D)
         Kilowatt-hour done clear
  E)
  None of these done clear
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• question_answer18)
  Electric fuse works on ____ effect of electric current.
  A)
  Magnetic                        done clear
  B)
  Lightening done clear
  C)
  Chemical           done clear
  D)
         Heating done clear
  E)
  None of these done clear
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• question_answer19)
  Which one of the following pairs is incorrect?
  A)
  Low resistivity - high conductivity done clear
  B)
  High resistivity - Low conductivity done clear
  C)
  Long wire - Low resistance done clear
  D)
  Thin wire - High resistance done clear
  E)
  None of these done clear
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• question_answer20)
  The amount of current that flows depends on the amount of ___ applied by the battery.
  A)
  Voltage  done clear
  B)
  Resistance done clear
  C)
  Heat                 done clear
  D)
         All the above      done clear
  E)
  None of these done clear
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• question_answer21)
              Bulging outward surface of a spoon is:
  A)
  Concave                        done clear
  B)
  Convex done clear
  C)
  Plane mirror       done clear
  D)
         Concavo-convex done clear
  E)
  None of these done clear
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• question_answer22)
  ___ is used in car headlights to reflect the light of the bulb.  
  A)
  Concave mirror   done clear
  B)
  Convex mirror done clear
  C)
  Convex lens       done clear
  D)
         Concave lens      done clear
  E)
  None of these done clear
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• question_answer23)
  If an object is placed between focus and pole of the concave mirror then image formed will be:
  A)
  Diminished and erect done clear
  B)
  Inverted and diminished done clear
  C)
  Magnified and erect done clear
  D)
  Magnified and inverted done clear
  E)
  None of these done clear
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• question_answer24)
  A dentist uses ____ to see a magnified image of a teeth.     
  A)
  Concave mirror   done clear
  B)
  Convex mirror done clear
  C)
  Plane mirror       done clear
  D)
         Concave lens      done clear
  E)
  None of these done clear
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• question_answer25)
  Image formed by a plane mirror is:
  A)
  Inverted and virtual done clear
  B)
  Virtual and erect done clear
  C)
  Inverted and real done clear
  D)
         Real and erect done clear
  E)
  None of these done clear
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• question_answer26)
  A virtual, erect and magnified image is obtained by a concave mirror when object is placed:
  A)
  At a distance between focal length and twice the focal length.           done clear
  B)
  At a distance greater than twice the focal length.     done clear
  C)
  At a distance less than its focal length.       done clear
  D)
  Far off done clear
  E)
  None of these done clear
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• question_answer27)
  Distance from focus to the centre of lens is:
  A)
  Focal point                     done clear
  B)
  Focal length done clear
  C)
  Centre of Curvature         done clear
  D)
  Radius of Curvature done clear
  E)
  None of these done clear
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• question_answer28)
  The given figure is showing:
  A)
  Converging of light rays.  done clear
  B)
  Diverging of light rays. done clear
  C)
  Dispersion of light. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer29)
  From which one of the following you will always get a virtual, erect and of the same size as object image?
  A)
  Concave mirror   done clear
  B)
  Convex mirror done clear
  C)
  Plane mirror done clear
  D)
         Concave lens done clear
  E)
  None of these done clear
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• question_answer30)
  Images that can be obtained on screen are:
  A)
  Virtual images    done clear
  B)
  Real images done clear
  C)
  Shadows            done clear
  D)
         Reflected images done clear
  E)
  None of these done clear
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• question_answer31)
  Which one of the following is the S.I. unit for potential difference?
  A)
  Ampere             done clear
  B)
  Ohm done clear
  C)
  Volt                  done clear
  D)
         Metre done clear
  E)
  None of these done clear
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• question_answer32)
  A person is standing 2.5m from a plane mirror. How far is the image from the person?
  A)
  2.5 m                done clear
  B)
  3 m done clear
  C)
  5 m                   done clear
  D)
         2.8 m done clear
  E)
  None of these done clear
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• question_answer33)
  A ray of light is incident on a plane mirror and angle of incidence is\[{{80}^{o}}\]. Calculate the angle between incident ray and the reflected ray.
  A)
  \[{{80}^{o}}\]                         done clear
  B)
  \[{{40}^{o}}\] done clear
  C)
  \[{{160}^{o}}\]           done clear
  D)
         \[{{100}^{o}}\] done clear
  E)
  None of these done clear
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• question_answer34)
  Radius of curvature of a concave mirror is 8 cm. What is the focal length  the concave mirror?
  A)
  8 cm                             done clear
  B)
  4 cm done clear
  C)
  16 cm   done clear
  D)
         20 cm done clear
  E)
  None of these done clear
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• question_answer35)
  The distance between focus and centre of a curved mirror is known as:
  A)
  Focal point                     done clear
  B)
  Focal length done clear
  C)
  Perpendicular     done clear
  D)
  Normal done clear
  E)
  None of these done clear
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• question_answer36)
  A magnifying lens is a ___ lens.
  A)
  Diverging                       done clear
  B)
  Converging done clear
  C)
  Concave                        done clear
  D)
  Plane done clear
  E)
  None of these done clear
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• question_answer37)
  Power of a lens is ___.
  A)
  2 F                                done clear
  B)
  3 F        done clear
  C)
  \[1/F\]    done clear
  D)
         \[1/2\,F\] done clear
  E)
  None of these done clear
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• question_answer38)
  Phenomenon of advance sunrise and delayed sunset is caused by:
  A)
  Reflection of light            done clear
  B)
  Refraction of light done clear
  C)
  Dispersion of light done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer39)
  Look at the following figure and find the position of the image
  A)
  At pole done clear
  B)
  At focus done clear
  C)
  Between focus and centre of curvature done clear
  D)
  Beyond centre of curvature done clear
  E)
  None of these done clear
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• question_answer40)
  Scientist who showed white light is made up of seven colours was:
  A)
  Galileo Galilei done clear
  B)
  Isaac Newton done clear
  C)
  Nicolaus Copernicus done clear
  D)
  James watt done clear
  E)
  None of these done clear
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