AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers

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AP State Syllabus 7th Class Science Bits 7th Lesson Electricity – Current and Its Effect with Answers

Choose the correct answer.

Question 1.
1 KW =
A) 10 W
B) 100 W
C) 1000 W
D) 10,000 W
Answer:
C) 1000 W

Question 2.
The element in electric cooker is made up of
A) Copper
B) Tungstun
C) Aluminium
D) Nichrome
Answer:
D) Nichrome

Question 3.
Wastage of electricity can be reduced by using
A) CFLS
B) Motors
C) Heaters
D) Bulbs
Answer:
A) CFLS

Question 4.
symbol indicates
A) a bulb
B) switch
C) battery
D) fuse
Answer:
D) fuse

Question 5.
Two or more cells joined together form a
A) Dry cell
B) Battery
C) Transformer
D) MCB
Answer:
B) Battery

Question 6.
If the circuit is open, then current
A) flows
B) flows or may not flow
C) reverses
D) does not flow
Answer:
D) does not flow

Question 7.
In parallel combination of electrical appliances, total electrical power
A) Increases
B) Decreases
C) Does not change
D) Remain same
Answer:
B) Decreases

Question 8.
In series combination of electrical appliances, total electrical power
A) Increases
B) Decreases
C) May increases or decreases
D) Does not changes.
Answer:
A) Increases

Question 9.
Positive terminal of the dry cell is made of
A) graphite
B) copper
C) zinc
D) iron
Answer:
A) graphite

Question 10.
Negative terminal of the dry cell is made of
A) graphite
B) copper
C) zinc
D) iron
Answer:
C) zinc

Question 11.
Dry cell converts ………….. energy into electrical energy.
A) potential
B) chemical
C) magnetic
D) kinetic
Answer:
B) chemical

Question 12.
Electric iron, electric cooker contain a coil of wire made of
A) nichrome
B) zinc
C) iron
D) any one
Answer:
A) nichrome

Question 13.
In electric cooker the amount of heat produced in coil depends on
A) thickness
B) material
C) length
D) all of these
Answer:
D) all of these

Question 14.
Wastage of electricity reduced by
A) tube light
B) bed light
C) bulb
D) CFL bulb
Answer:
D) CFL bulb

Question 15.
One of the following is preferable instead of fuse
A) MAB
B) MCB
C) MDB
D) MOB
Answer:
B) MCB

Question 16.
1 unit of power equal to
A) 1MW
B) 1MWH
C) 1KW
D) 1KWH
Answer:
D) 1KWH

Question 17.
Michael Faraday invented
A) transformer
B) dynamo
C) generator
D) all of these
Answer:
D) all of these

Question 18.
In a dry cell what serves as a positive terminal?
A) Zinc metal
B) Ammonium chloride
C) Carbon powder
D) Carbon Rod
Answer:
D) Carbon Rod

Question 19.
In a circuit the switch is in this position then the bulb is
AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers 3
Answer:
A)

Question 20.
AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers 4
It is a
A) parallel connection of bulbs
B) series connection of cells
C) simple circut
D) parallel connection of cells
Answer:
C) simple circut

Question 21.
AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers 5
It is a
A) simple circut
B) connecting cells in parallel
C) connecting cells in series
D) connecting bulb in parallel
Answer:
B) connecting cells in parallel

Question 22.
L.E.D means
A) Light Emitting Device
B) Light Emitting Diode
C) Light Emergency Device
D) Light Energy Device
Answer:
B) Light Emitting Diode

Question 23.
The following consume less electricity
AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers 6
Answer:
D)

Question 24.
What is the name of this instrument?
AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers 7
A) Fuse
B) Digital meter
C) Miniature circut breaker
D) Switch
Answer:
C) Miniature circut breaker

Question 25.
The watts for 1 kilowatt
A) 10
B) 100
C) 1000
D) 10,000
Answer:
C) 1000

Question 26.
1 unit of electricity means
A) It uses up 1 watt per 1 hour
B) 1 kilowatt per 1 hour
C) 1 watt per 10 hours
D) 1 kilowatt per 10 hours
Answer:
B) 1 kilowatt per 1 hour

Question 27.
Who invented the first electric generator?
A) Wattson
B) Galileo
C) Faraday
D) James watt
Answer:
C) Faraday

Question 28.
CFL means
A) Compact Fluorescent Lamp
B) Compact Fluorescent Light
C) Colour Fluorscent Lamp
D) Colour Fluorescent Light
Answer:
A) Compact Fluorescent Lamp

Question 29.
This instrument contains a coil of wire made up of Nichrome
A) Electric iron
B) Electric cooker
C) Electric heater
D) All of these
Answer:
D) All of these

Question 30.
Which protects our house when current in a circut exceeds the safe limit.
A) LED
B) Digital meter
C) MCB
D) CFL
Answer:
C) MCB

Question 31.
In a dry cell which serves as a negative terminal?
A) Zinc metal
B) Carbon Rod
C) Ammonium chloride
D) Carbon powder
Answer:
A) Zinc metal

Question 32.
In parallel combination of electrical appliances, total electrical power
A) Increases
B) Decreases
C) Does not change
D) Remains same
Answer:
B) Decreases

Question 33.
Device used to close or open an electric circuit is
A) electric bulb
B) battery
C) switch
D) fuse
Answer:
C) switch

Question 34.
Safety device used electric circuit is
A) electric bulb
B) battery
C) switch
D) fuse
Answer:
D) fuse

Question 35.
It is a
AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers 8
A) Connecting cells in series
B) Connecting cells in parallel
C) Connecting bulbs in series
D) Connecting bulbs in parallel
Answer:
B) Connecting cells in parallel

Question 36.
symbol represents
A) Fuse
B) Bulb
C) Key
D) Cell
Answer:
A) Fuse

Question 37.
It is used to protect the circuit
AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers 10
Answer:
C)

Question 38.
Guess the reasons for not glowing the bulb in the circuit.
A) Chemicals get exhausted
B) Connections are not in proper
C) Switch may not work properly
D) All the above
Answer:
D) All the above

Question 39.
Among these which electric bulb consumes less power?
A) L.E.D. Bulb
B) CFL Bulb
C) Tubelight
D) Round bulb
Answer:
A) L.E.D. Bulb

Question 40.
The connection of serial sets that are used in marriages
A) Parallel
B) Series
C) Parallel, Series
D) Series, Parallel
Answer:
B) Series

Question 41.
After studying the lesson electricity and its effect what safety device do you use in electric circuit?
A) Bulb
B) Battery
C) Switch
D) Fuse
Answer:
D) Fuse

Question 42.
Name the device which “turns off’ automatically when current in a circuit exceeds the safe limit
A) Battery
B) Compressed lamp
C) Miniature Circuit Breaker
D) Switch
Answer:
C) Miniature Circuit Breaker

Question 43.
AP 7th Class Science Bits Chapter 7 Electricity – Current and Its Effect with Answers 11
The circuit symbols given in the image are ……….. and …………
A) Battery, fuse
B) Battery, cell
C) Fuse, battery
D) Bulb, switch
Answer:
A) Battery, fuse

Question 44.
Find the correct statement from the following.
P: In series connection of bulbs, if one bulb gets fused, all the other bulbs will stop glowing.
Q: In parallel connection, if one bulb is disconnected the other bulbs continue to glow.
A) P is correct
B) Q is incorrect
C) Both P & Q are correct
D) Both P & Q are incorrect
Answer:
C) Both P & Q are correct

Question 45.
A safety device used to avoid fire when excessive electric current flows through a circuit is called a …………
A) Bulb
B) Fuse
C) Inverter
D) Power bank
Answer:
B) Fuse