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Electric Current and its Effects Science - Electric Current and its Effects

Gujarat Board (GSEB) - STD 7 - Science (GSEB - English Medium). 121 questions in this chapter.

Question types

Electric Current and its Effects question types

121 questions across 10 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

121
Questions
10
Question groups
5
Question types
Sample Questions

Electric Current and its Effects questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ (1 Marks)1 Mark
Three bulbs A, B, C are connected in a circuit as shown in figure. When the switch is 'ON',
Image
  • A
    bulb C will glow first
  • B
    bulb B and C will glow simultaneously and bulb A will glow after sometime
  • ✓
    all the bulbs A, B and C will glow at the same time
  • D
    the bulbs will glow in the order A, B and C

Answer: C.

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Q 2MCQ (1 Marks)1 Mark
Choose the statement which is not correct in the case of an electric fuse.
  • A
    Fuses are inserted in electric circuits of all buildings.
  • B
    There is a maximum limit on the current which can safely flow through the electric circuits.
  • ✓
    There is a minimum limit on the current which can safely flow in the electric circuits.
  • D
    If a proper fuse is inserted in a circuit, it will blow off if current exceeds the safe limit.

Answer: C.

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Q 4MCQ (1 Marks)1 Mark
Which of these devices work due to the heating effect of electric current ?
  • A
    Electric fan
  • B
    Electric bell
  • ✓
    Electric kettle
  • D
    Electric torch

Answer: C.

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Q 5MCQ (1 Marks)1 Mark
Which of these consumes the least electricity for producing the same amount of light?
  • A
    CFL
  • ✓
    LED
  • C
    Filament bulb
  • D
    Fluorescent tube

Answer: B.

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Q 6Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A) An electric bulb glass becomes hot after sometime when it is connected to an electric supply.
Reason (R) A bulb becomes hot due to the heating effect of electric current.
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false
  • D
    A is false but R is true.

Answer: A.

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Q 7Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A) In a cell, the longer line represents positive terminal and shorter line represent negative terminal.
Reason (R) A battery is a combination of two or more cells.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false
  • D
    A is false but R is true.

Answer: B.

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Q 8Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A) Fuse wires have low melting point and high resistance.
Reason (R) An electric cell produces less amount of electric current.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false
  • D
    A is false but R is true.

Answer: B.

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Q 9Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A) Electromagnets are permanent magnets.
Reason (R) Magnetic strength of an electromagnet can be changed.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false
  • ✓
    A is false but R is true.

Answer: D.

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Q 10Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A) Wire gets hot when electric current passes through it.
Reason (R) It is due to the resistance in the wire.
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is the not the correct explanation of A
  • C
    A is true but R is false
  • D
    A is false but R is true

Answer: A.

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Q 302 Marks Questions2 Marks
Your teacher had shown you the following activity.
Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the figure. The current is switched ON and some pins are placed near the ends of the nail.
Image

Write down any three questions that come to your mind about this activity.
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Q 323 Marks Question3 Marks
Explain why, when the current is switched ON through a wire, the needle of a compass kept nearby gets deflected from its North-South position?
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Q 343 Marks Question3 Marks
Explain the following.
(i) Copper and aluminium wires are usually employed for electricity transmission. Explain the reason.
(ii) Explain how does the resistance of a wire vary with its length?
(iii) The tungsten is used almost exclusively for filament of electric lamp. Comment.
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Q 353 Marks Question3 Marks
Zubeda made an electric circuit using a cell holder shown in figure, a switch and a bulb. When she put the switch in the ON position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.
Image
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Q 37Match the Following.4 Marks
Match the Column I with Column II.
Column I.Column II
(a) A device used in electric bell(i) Nichrome wire
(b) A material used for making filament of bulb(ii) Soft iron
(c) A material used for making electromagnets(iii) Tungsten
(d) A material used for making heater(iv) Electromagnet
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Q 385 Marks Questions5 Marks
In the set up shown here, the bulb has lighted up.
Image

Which of the following statement about liquid is/are correct?
I. Liquid is a distilled water.
II. Liquid is a tap water.
III. Liquid is a good conductor of electricity.
(a) III only
(b) II only
(c) I and III only
(d) II and III only
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Q 395 Marks Questions5 Marks
Draw the symbols in your notebook to represent the following components of electrical circuits: connecting wires, switch in the OFF position, bulb, cell, switch in the ON position and battery.
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Q 405 Marks Questions5 Marks
A student performs an experiment where he uses a heating coil to heat the water as shown in the figure. The initial temperature of the water is measured as $10^{\circ} C$. After switching it ON for 5 min, the student records the temperature of the water as $18^{\circ} C$.
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The water is allowed to return back to its initial temperature. The activity is then repeated with another heating coil having half the length of the original heating coil. He notices that after 5 min, the temperature of the water reads $14^{\circ} C$. Which statement can be concluded based on the activity?
(a) Reading on thermometer reduces with time.
(b) Temperature of water drops with every repetition.
(c) Length of the material affects the amount of heating.
(d) Temperature of the water increases after a certain period of time.
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Q 415 Marks Questions5 Marks
Geeta had setup the experiment as shown in figure.
Image

She found out that the steel nail in setup X had attracted less iron pins than the steel nail in setup Y. What could be the reason for this?
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Q 425 Marks Questions5 Marks
Image

(i) As shown in the above picture, why does the circuit acquire magnetism?
(ii) How can the magnetic strength of an electromagnet can be increased?
(iii) Name two commercially used devices that work on electromagnetism.
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Q 43Case study (4 Marks)4 Marks
An electric fuse consists of a metal wire. The wire breaks the electric circuit when the electricity load is too high.
Image
(i) What makes the wire break when the electricity load is too high ?
(a) It is made of metal.
(b) It has a low melting point.
(c) It is a good conductor of heat.
(d) It is a good conductor of electricity.
(ii) Why does the filament of a bulb glow when connected to an electric circuit?
(iii) Which of these can cause a fire in an electric circuit?
Choose Yes or No for the correct response
Can this cause a fire in an electricYes or No circuit?
(a) Use of multiple electric fuses(i) Battery
(b) Flow of a very high electric current(ii) Electric bulb
(c) Direct touching of two uncovered wires(iii) Electric bell
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Q 44Case study (4 Marks)4 Marks
Image

(i) What is the function of the switch in the circuit?
(ii) Name the two terminals of a battery.
(iii) Name the alloy used in the filament of bulb. Give its function.
(iv) (a) In the given circuit, name the component that must be hot to work.
(b) Give an example of a device other than a bulb which shows the heating effect of current.
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