Practice the AP 7th Class Science Bits with Answers Chapter 7 Electricity – Current and Its Effect on a regular basis so that you can attempt exams with utmost confidence.

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

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

Question 2.
The element in electric cooker is made up of
A) Copper
B) Tungstun
C) Aluminium
D) Nichrome
D) Nichrome Question 3.
Wastage of electricity can be reduced by using
A) CFLS
B) Motors
C) Heaters
D) Bulbs
A) CFLS

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

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

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

Question 10.
Negative terminal of the dry cell is made of
A) graphite
B) copper
C) zinc
D) iron
C) zinc Question 11.
Dry cell converts ………….. energy into electrical energy.
A) potential
B) chemical
C) magnetic
D) kinetic
B) chemical

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

Question 14.
Wastage of electricity reduced by
A) tube light
B) bed light
C) bulb
D) CFL bulb
D) CFL bulb Question 15.
One of the following is preferable instead of fuse
A) MAB
B) MCB
C) MDB
D) MOB
B) MCB

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

Question 17.
A) transformer
B) dynamo
C) generator
D) all of these
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
D) Carbon Rod Question 19.
In a circuit the switch is in this position then the bulb is A)

Question 20. It is a
A) parallel connection of bulbs
B) series connection of cells
C) simple circut
D) parallel connection of cells
C) simple circut

Question 21. It is a
A) simple circut
B) connecting cells in parallel
C) connecting cells in series
D) connecting bulb in parallel
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
B) Light Emitting Diode

Question 23.
The following consume less electricity D)

Question 24.
What is the name of this instrument? A) Fuse
B) Digital meter
C) Miniature circut breaker
D) Switch
C) Miniature circut breaker

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

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

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

Question 33.
Device used to close or open an electric circuit is
A) electric bulb
B) battery
C) switch
D) fuse
C) switch Question 34.
Safety device used electric circuit is
A) electric bulb
B) battery
C) switch
D) fuse
D) fuse

Question 35.
It is a A) Connecting cells in series
B) Connecting cells in parallel
C) Connecting bulbs in series
D) Connecting bulbs in parallel
B) Connecting cells in parallel

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

Question 37.
It is used to protect the circuit 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
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
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
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
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
C) Miniature Circuit Breaker

Question 43. The circuit symbols given in the image are ……….. and …………
A) Battery, fuse
B) Battery, cell
C) Fuse, battery
D) Bulb, switch
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 