How is electric current produced in an electrolyte?

A) Only due to the flow of positive charges

B) Only due to the flow of negative charges

B) The potential difference across the terminals of a battery when it is not driving current in the external circuit.

A) The potential difference across the terminals of a battery when it is driving current in the external circuit.

C) The total energy stored in a battery.

D) The resistance of the battery.

A) The amount of current passing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and the physical state of the conductor does not change.

B) The amount of current passing through a conductor is inversely proportional to the potential difference applied across its ends, provided the temperature and the physical state of the conductor does not change.

C) The amount of current passing through a conductor is directly proportional to the potential difference applied across its ends, and is independent of the temperature and the physical state of the conductor.

D) The amount of current passing through a conductor is inversely proportional to the potential difference applied across its ends, and is independent of the temperature and the physical state of the conductor.

What kind of materials obey Ohm's law?

C) Both ohmic and non-ohmic materials

D) Neither ohmic nor non-ohmic materials

What is the relationship between resistance and length of a wire?

A) Resistance is directly proportional to the length of the wire.

B) Resistance is inversely proportional to the length of the wire.

C) Resistance is directly proportional to the area of cross section of the wire.

D) Resistance is inversely proportional to the area of cross section of the wire.

What is the relationship between resistance and temperature?

C) Resistance increases with temperature for some substances and decreases for others.

A) Resistance increases with temperature for all substances.

B) Resistance decreases with temperature for all substances.

D) Resistance is independent of temperature for all substances.

What is the difference between an ohmic conductor and a non-ohmic conductor?

B) An ohmic conductor has a linear current-voltage relationship, while a non-ohmic conductor has a non-linear relationship.

A) An ohmic conductor has a non-linear current-voltage relationship, while a non-ohmic conductor has a linear relationship.

C) An ohmic conductor has a constant resistance over a wide range of voltages, while a non-ohmic conductor has a resistance that changes with voltage or current.

D) An ohmic conductor has a resistance that changes with voltage or current, while a non-ohmic conductor has a constant resistance over a wide range of voltages.

Why do we use metal wires for conduction of electricity?

c) Because metals have free electrons that can move easily.

a) Because metals are abundant and cheap.

b) Because metal wires are flexible.

d) Because metals are good insulators.

Why can't current flow through insulators?

d) Because their electrons are tightly bound to atoms.

a) Because they have free electrons that are not bound to atoms.

b) Because they have very low resistance.

c) Because they are made of non-metallic materials.

What is the voltage across each resistor in a series combination?

a) Different for each resistor.

b) Equal to the total voltage supplied by the source.

What is the equivalent resistance of a series combination of resistors?

a) The sum of the individual resistances.

b) The difference between the individual resistances.

c) The product of the individual resistances.

d) The quotient of the individual resistances.

What is the voltage across each resistor in a parallel combination?

a) Different for each resistor.

b) Equal to the total voltage supplied by the source.

What is the equivalent resistance of a parallel combination of resistors?

d) Less than the smallest individual resistance.

a) The sum of the individual resistances.

b) The difference between the individual resistances.

c) The product of the individual resistances.

What is electric power?

B) The amount of energy supplied by current in unit time

A) The amount of energy supplied by voltage in unit time

C) The amount of energy supplied by resistance in unit time

D) The amount of energy supplied by capacitance in unit time

What is a kilowatt-hour?

D) The amount of energy delivered by a power of one kilowatt in one hour

What is direct current?

B) A current that is unidirectional

A) A current that changes its polarity after equal intervals of time

C) A current that oscillates 50 times every second

D) A current produced by AC generators

What is alternating current?

A) A current that changes its polarity after equal intervals of time

B) A current that is unidirectional

C) A current that oscillates 50 times every second

D) A current produced by DC generators

Under damp conditions, the resistance of human skin is drastically reduced to a few hundred ohms. Why is it important to avoid operating electrical appliances with wet hands?

B) To increase the resistance of human skin

C) To reduce the resistance of human skin

C) A safety device that is connected in series with the live wire in a circuit

A) A safety device that is connected in series with the neutral wire in a circuit

B) A safety device that is connected in parallel with the live wire in a circuit

D) A safety device that is used to measure current in a circuit

How does a fuse protect electrical equipment?

C) It melts when large current passes through it, breaking the circuit before the wires become very hot and cause fire

A) It prevents circuit overloads

B) It disconnects the supply automatically if current exceeds the normal value

D) It provides a safe route for the current to flow through

What is the purpose of using fuses and circuit breakers in an electric circuit as safety devices?

C) To prevent circuit overloads

D) To increase the resistance of human skin

Which of the following should be taken into consideration while using fuses in household electrical circuits?

C) Fuses to be used should have slightly more rating than the current which the electrical appliance will draw under normal conditions

A) Fuses should have a lower rating than the current which the electrical appliance will draw under normal conditions

B) Fuses should be connected in the neutral wire so that the appliance will not operate after the fuse has blown

D) Switch ON the main before changing any fuse

What is a circuit breaker?

C) A safety device that is connected in series with the live wire in a circuit

A) A safety device that is connected in series with the neutral wire in a circuit

B) A safety device that is connected in parallel with the live wire in a circuit

D) A device used to measure voltage in a circuit

How does a circuit breaker act as a safety device?

B) It disconnects the supply automatically if current exceeds the normal value

A) It prevents circuit overloads

C) It melts when large current passes through it, breaking the circuit before the wires become very hot and cause fire

D) It provides a safe route for the current to flow through

What is the purpose of an Earthwire?

C) To provide a safe route for the current to flow through

A) To protect electrical equipment

B) To reduce the resistance of human skin

D) To prevent circuit overloads

Why should we not operate any electrical appliance with wet hands?

d) Wet hands can cause electric shock

a) Wet hands can reduce the resistance of the appliance

b) Wet hands can increase the resistance of the appliance

c) Wet hands can cause the appliance to overheat

G10 Phy Ch-14 Quiz

84 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is electric current?

A) The flow of positive charges only

B) The flow of negative charges only

C) The flow of both positive and negative charges

D) None of the above

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the unit of electric current?

A) Joule

B) Volt

C) Ampere

D) Ohm

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following statements is true regarding the production of current in metals?

A) The current is produced only due to the flow of positive charges.

B) The current is produced only due to the flow of negative charges.

C) The current is produced due to the flow of both positive and negative charges.

D) None of the above

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the formula for electric current?

A) I = Q/t

B) Q = It

C) P = IV

D) V = IR

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the SI unit of current?

A) Joule

B) Watt

C) Ampere

D) Volt

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the conventional direction of current flow?

A) From negative to positive terminal of a battery

B) From positive to negative terminal of a battery

C) From the center to the circumference of a conductor

D) None of the above

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the term used for the potential energy per unit charge?

A) Electrical potential

B) Electric field

C) Electric potential difference

D) Electrical potential energy

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G10 Phy Ch-14

What is electric current?

What is the unit of electric current?

Which of the following statements is true regarding the production of current in metals?

What is the formula for electric current?

What is the SI unit of current?

What is the conventional direction of current flow?

What is the term used for the potential energy per unit charge?

Which of the following instruments can detect small current in a circuit?

How is electric current produced in an electrolyte?

What is the value of current if 30 C charge passes through a wire in 5 seconds?

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