Cells and Simple Circuits – LearnITbyTests

1. Why is Graphite a poor conductor of electricity?

It has fewer free electrons

It has a large number of free electrons

It has no free electrons

All of above

Question 1 of 55

2. Voltage is directly proportional to current so long as resistance is kept constant?

True

False

Maybe

None

Question 2 of 55

3. Semiconductors are materials whose electrical properties lie between conductors and insulators?

False

True

Maybe

None

Question 3 of 55

4. Define local action?

It is eating away (corroding) of the least reactive metal

It is eating away (corroding) of the most reactive metal

It is the setting up of tiny local cells due to impurities at the most reactive metal resulting in the production of hydrogen bubbles and the dissolution of the metal

No idea

Question 4 of 55

5. Which of the following is not among the uses of electrical energy?

Producing light i.e. electrical bulb

Producing heat i.e. electric cooker

Used in high speed trains

Producing yoghurt from milk

Question 5 of 55

6. Which of the following is not a source of electricity?

Solar cells

Thermocouples

Batteries

Pump

Question 6 of 55

7. How does a depolarizer work?

Some of its oxygen atoms combine with hydrogen atoms to produce water.

It increases the rate of production of hydrogen gas

It has no effect to the rate of production of hydrogen gas

None of the above

Question 7 of 55

8. Which of the following is not a conductor of electricity?

Copper

Plastic

Silver

Aluminum

Question 8 of 55

9. In a primary cell the most reactive metal will lose electrons and become positive ion?

TRUE

False

Maybe

None

Question 9 of 55

10. What increases Local action?

Coating of impurities to the least reactive metal in a primary cell

Coating of most reactive metal with mercury in a primary cell

Coating of impurities to the most reactive metal in a primary cell

None of the above

Question 10 of 55

11. Which of the following statements is TRUE about when cells are connected in series?

Cells connected in series increases the E.M.F across them

Cells connected in series increases the current flowing in the circuit

The positive terminal of one cell has to be connected to the negative terminal of the other.

All of the above

Question 11 of 55

12. Materials which allow electric charges to pass through them are called?

Insulators

Conductors

Copper

Bad conductors

Question 12 of 55

13. Which of the following is NOT among the maintenance procedures of an accumulator?

The accumulator should not be directly placed on the ground during storage

The terminals should always be kept clean and greased

The accumulator can be left in a discharged condition for a long period of time

Topping of the accumulator should be done by distilled water and not the acid

Question 13 of 55

14. Which of the following is not an example of a secondary cell?

Lithium batteries

Lead-acid accumulator

Lithium ion batteries

Leclanches cell

Question 14 of 55

15. Direction of charges in a chemical cell is opposite the direction of electron flow?

True

False

Maybe

None

Question 15 of 55

16. What is an electric current?

Flow of charges in a circuit

Flow of volts between two points in a circuit

Rate of flow of charges in a circuit

None of the above

Question 16 of 55

17. Which of the following statements is TRUE about when cells are connected in parallel?

E.M.F of the cells is the SAME as that for a single cell

There is NO increase in current flowing in the circuit

The positive terminal of one cell is connected to the positive terminal of another

All of the above

Question 17 of 55

18. Why are secondary cells called storage cells?

They store heat energy as chemical energy

They store electrical energy as chemical energy

They store mechanical energy as chemical energy

they store bitcoins

Question 18 of 55

19. Cells in parallel connection should have IDENTICAL E.M.F or otherwise one will drain the other?

True

False

Maybe

None

Question 19 of 55

20. Which of the following statements is correct concerning electrical devices which are connected in parallel?

The current flowing in one does not affect the current flowing in the other devices

If one of the devices is disconnected or gets spoilt, current will still flow in the other device.

Electrical devices connected in parallel offer less resistance to flow of current compared to series

All of the above

Question 20 of 55

21. Chemical cells are cells which provide E.M.F as a result of a chemical reaction?

True

False

Maybe

None

Question 21 of 55

22. A battery is two or more cells connected together?

True

False

Maybe

None

Question 22 of 55

23. Which of the following statements is correct concerning electrical devices which are connected in series?

The same current flows through electrical devices which are connected in series

If one of the device is disconnected it introduces an open/ broken circuit

Electrical devices connected in series offer greater resistance to flow of current

All of the above

Question 23 of 55

24. Why do operations in ships prefer alkaline accumulator over Lead-acid accumulator?

They are more portable (lighter)

They require very little attention to maintain

Large currents can be drawn from them

All of the above

Question 24 of 55

25. Mention the 2 types of chemical cells

Primary cells

Tertiary cells

Secondary cells

pre primary

Question 25 of 55

26. Mention the 2 types of conductors

Good

Poor/Bad

terrible

devastating

Question 26 of 55

27. What are the main reasons which cause an open circuit?

Loose connection of wires or components in the circuit

An open switch in an electrical circuit

Rusting of wires in a connection i.e. battery terminal

All of the above

Question 27 of 55

28. What is polarization in a primary cell?

Accumulation of hydrogen bubbles (gas)

Accumulation of electrons

The positive plate of the least reactive metal

None of the above

Question 28 of 55

29. The MAIN advantage of parallel connection of cells is that current is supplied for a longer time?

True

False

Maybe

None

Question 29 of 55

30. How do you minimize polarization in a primary cell?

Add depolarizer i.e. potassium dichromate

By switching off the circuit

By using metals of same material

By using metals of same rate of chemical reaction

Question 30 of 55

31. In a primary cell the least reactive metal will lose electrons and become negative ion?

TRUE

False

Maybe

None

Question 31 of 55

32. A chemical cell which can be renewed once the chemical cells are exhausted is called?

Primary cell

Tertiary cell

Secondary cell

None

Question 32 of 55

33. Mention 2 defects of a primary simple cell

Local action

Local reaction

Polarization

local government

Question 33 of 55

34. Which of the following is NOT a disadvantage of the alkaline accumulator over Lead-acid accumulator?

They are cheap

They have a lower E.M.F per cell

They are very expensive

They have a lower current per cell

Question 34 of 55

35. Potential difference is measured in volts by an instrument called?

Ammeter

Voltmeter

Potentiometer

Rheostat

Question 35 of 55

36. What are the effects of polarization in a primary cell?

Provides an insulation to the flow of current

Sets up some local cells with least reactive cell

It increases internal resistance in a primary cell

All of the above

Question 36 of 55

37. SI UNIT of current is?

Amperes

Voltage

Joules

Question 37 of 55

38. Electric current is the rate of flow of charges?

False

True

Maybe

None

Question 38 of 55

39. Why do bulbs connected in parallel light brighter than the ones connected in series?

The potential difference across electrical devices connected in parallel is the maximum supply voltage whereas in devices connected in series the supply voltage is divided among them.

Electrical devices connected in series offer greater resistance

no idea

None of the above

Question 39 of 55

40. Why are metals good conductors of electricity?

They have no free electrons

They have large number of free electrons

They have fewer free electrons

None of the above

Question 40 of 55

41. What will happen if cell A which has E.M.F of 3.0 V is connected in parallel to another cell which has an E.M.F of 1.5V?

ONE cell will start to drain the other i.e. cell B from cell A

No change will happen

An explosion will occur

There will be no current

Question 41 of 55

42. What is the difference between E.M.F and potential difference?

E.M.F of a cell/ battery is the voltage across its terminals when it is supplying no current ( an open circuit) while potential difference of a cell/ battery is the voltage across its terminals when it is supplying current (closed circuit).

E.M.F of a cell/battery has a greater voltage than potential difference

The difference between E.M.F voltage and P.D voltage is called Lost Voltage

All the above

Question 42 of 55

43. When 2 or more cells are connected such that the positive terminal of one is connected to the positive terminal of the other, while the negative terminal of one is connected to the negative terminal of the other; they are said to be connected in?

Series

Parallel

Parallel-series

Series-parallel

Question 43 of 55

44. Which of the following is not among the maintenance procedures of accumulators?

The level of electrolyte should be checked regularly and maintained above the plates

the accumulator should not be charged when the E.M.F of the cell drops below 1.8v

do not short circuit or overcharge the accumulator

Large currents should not be drawn from the battery for a long time

Question 44 of 55

45. What is the main principle of selecting a metal plate to be used in a primary cell?

Two metals of different material i.e. copper and zinc

Two metals of the same material

Two metals of different rates of reaction

all of the above

Question 45 of 55

46. What determines the current-carrying capacity in a Lead acid accumulator?

The surface area of plates

The length of the plates

The no. of plates

material of plates

Question 46 of 55

47. Which of the following formulas is used to calculate the amount of current flowing in a circuit given the charge?

P = VIT

R= V/I

I= Q/t

I= Q x t

Question 47 of 55

48. What type of circuit does not allow charges to move or stops the charges flowing?

Closed circuit

Unbroken

Open/broken circuit

None of the above

Question 48 of 55

49. How do you prevent short circuiting in a Lead acid accumulator?

By separating the plates with insulating sheets

By greasing the accumulator terminals

By topping of water to the accumulator

None of above

Question 49 of 55

50. Why do bubbles accumulate (polarization) around the least reactive metal of primary cell?

Hydrogen ions of an acid will move to the positive plate ( least reactive metal)

Hydrogen ions will gain electrons which were received by the positive plate.

Hydrogen ions become hydrogen gas after gaining electrons

All of the above

Question 50 of 55

51. When 2 or more cells are connected such that the positive terminals of one is joined to the negative terminal of another one, they are said to be connected in?

Parallel

Series

Series-parallel

Parallel-series

Question 51 of 55

52. A chemical cell which cannot be renewed once the chemical cells are exhausted is called?

Primary cell

Tertiary cell

Secondary cell

None

Question 52 of 55

53. What type of circuit allows charges to move in a complete path?

Open

Broken

Closed circuit

Air circuit

Question 53 of 55

54. Mention 2 types of circuits?

Closed and open

Open and broken circuit

Unbroken and closed

fake and real

Question 54 of 55

55. How are secondary cells recharged?

By applying a reverse current to the terminals

By adding electrolyte to it

By applying direct current to its terminals

buying new ones

Question 55 of 55

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