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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
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B)
MCB done
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C)
Negative terminal done
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D)
ISI done
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E)
None of these done
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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
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B)
Lamp 1 will glow first. done
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C)
Lamp 1 and 2 will glow together and lamp 3 will glow later. done
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D)
All the lamps will glow together done
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E)
None of these done
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question_answer3)
Short wire has ____ whereas long wire has ____ resistance.
A)
More, less done
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B)
Less, no done
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C)
Less, more done
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D)
All the above done
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E)
None of these done
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question_answer4)
A circuit diagram which includes a battery of 3 cells, a bulb and an open switch is:
A)
B)
C)
D)
E)
None of these done
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question_answer5)
Nichrome is an alloy of:
A)
Chromium done
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B)
Iron done
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C)
Nickel done
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D)
All the above done
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E)
None of these done
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question_answer6)
Element of electric iron become red-hot on passing current because:
A)
Colour of element is red. done
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B)
It has very high resistance. done
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C)
It has a thick wire. done
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D)
All the above done
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E)
None of these done
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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
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B)
Galileo Galilei done
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C)
H.C. Oersted done
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D)
Albert Einstein done
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E)
None of these done
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question_answer8)
Electric fuse is used to protect household electric appliances from accidental:
A)
Small flow of current done
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B)
Large flow of current done
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C)
No flow of current done
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D)
All the above done
clear
E)
None of these done
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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
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B)
(ii) and (iii) done
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C)
(iii) and (iv) done
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D)
(i) and (iv) done
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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
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B)
Wire with greater resistance is use. done
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C)
Bulb with broken filament is used. done
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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
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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
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D)
No heat will be produced. done
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E)
None of these done
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question_answer12)
A solenoid acts as a ___ when electric current passes through it.
A)
Resistor done
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B)
Bar magnet done
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C)
Insulator done
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D)
Electric torch done
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E)
None of these done
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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
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B)
Chemical effect of current done
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C)
Magnetic effect of current done
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D)
All the above done
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E)
None of these done
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question_answer14)
____ is a magnet produced by electric current.
A)
Bar magnet done
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B)
Permanent magnet done
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C)
Electromagnet done
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D)
All the above done
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E)
None of these done
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question_answer15)
Current means:
A)
Flow of protons in the circuit. done
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B)
Flow of neutrons in the circuit. done
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C)
Flow of electrons in the circuit. done
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D)
All the above done
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E)
None of these done
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question_answer16)
___ is measured by voltmeter.
A)
Current done
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B)
Resistance done
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C)
Potential difference done
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D)
Magnetism done
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E)
None of these done
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question_answer17)
Which is the commercial unit of electrical energy?
A)
\[Joule/s\] done
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B)
Kilowatt done
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C)
Joule done
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D)
Kilowatt-hour done
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E)
None of these done
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question_answer18)
Electric fuse works on ____ effect of electric current.
A)
Magnetic done
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B)
Lightening done
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C)
Chemical done
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D)
Heating done
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E)
None of these done
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question_answer19)
Which one of the following pairs is incorrect?
A)
Low resistivity - high conductivity done
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B)
High resistivity - Low conductivity done
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C)
Long wire - Low resistance done
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D)
Thin wire - High resistance done
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E)
None of these done
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question_answer20)
The amount of current that flows depends on the amount of ___ applied by the battery.
A)
Voltage done
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B)
Resistance done
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C)
Heat done
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D)
All the above done
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E)
None of these done
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question_answer21)
Bulging outward surface of a spoon is:
A)
Concave done
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B)
Convex done
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C)
Plane mirror done
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D)
Concavo-convex done
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E)
None of these done
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question_answer22)
___ is used in car headlights to reflect the light of the bulb.
A)
Concave mirror done
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B)
Convex mirror done
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C)
Convex lens done
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D)
Concave lens done
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E)
None of these done
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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
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B)
Inverted and diminished done
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C)
Magnified and erect done
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D)
Magnified and inverted done
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E)
None of these done
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question_answer24)
A dentist uses ____ to see a magnified image of a teeth.
A)
Concave mirror done
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B)
Convex mirror done
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C)
Plane mirror done
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D)
Concave lens done
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E)
None of these done
clear
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question_answer25)
Image formed by a plane mirror is:
A)
Inverted and virtual done
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B)
Virtual and erect done
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C)
Inverted and real done
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D)
Real and erect done
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E)
None of these done
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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
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B)
At a distance greater than twice the focal length. done
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C)
At a distance less than its focal length. done
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D)
Far off done
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E)
None of these done
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question_answer27)
Distance from focus to the centre of lens is:
A)
Focal point done
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B)
Focal length done
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C)
Centre of Curvature done
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D)
Radius of Curvature done
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E)
None of these done
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question_answer28)
The given figure is showing:
A)
Converging of light rays. done
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B)
Diverging of light rays. done
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C)
Dispersion of light. done
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D)
All the above done
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E)
None of these done
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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
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B)
Convex mirror done
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C)
Plane mirror done
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D)
Concave lens done
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E)
None of these done
clear
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question_answer30)
Images that can be obtained on screen are:
A)
Virtual images done
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B)
Real images done
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C)
Shadows done
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D)
Reflected images done
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E)
None of these done
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question_answer31)
Which one of the following is the S.I. unit for potential difference?
A)
Ampere done
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B)
Ohm done
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C)
Volt done
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D)
Metre done
clear
E)
None of these done
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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
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B)
3 m done
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C)
5 m done
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D)
2.8 m done
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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
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B)
\[{{40}^{o}}\] done
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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
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B)
4 cm done
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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
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B)
Focal length done
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C)
Perpendicular done
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D)
Normal done
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E)
None of these done
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question_answer36)
A magnifying lens is a ___ lens.
A)
Diverging done
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B)
Converging done
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C)
Concave done
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D)
Plane done
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E)
None of these done
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question_answer37)
Power of a lens is ___.
A)
2 F done
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B)
3 F done
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C)
\[1/F\] done
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D)
\[1/2\,F\] done
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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
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B)
Refraction of light done
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C)
Dispersion of light done
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D)
All the above done
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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
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B)
At focus done
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C)
Between focus and centre of curvature done
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D)
Beyond centre of curvature done
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E)
None of these done
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question_answer40)
Scientist who showed white light is made up of seven colours was:
A)
Galileo Galilei done
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B)
Isaac Newton done
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C)
Nicolaus Copernicus done
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D)
James watt done
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E)
None of these done
clear
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