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Worksheets9th session
Total questions: 71
Worksheet time: 36mins
From where do magnetic forces arise?
Interactions between electric fields.
Interactions between gravitational fields.
Interactions between magnetic fields.
Interactions between sound waves.
How many poles does a magnet typically have?
One pole (always a north pole).
One pole (always a south pole).
Two poles (a north pole and a south pole).
Three poles (north, south, and east).
What happens when two like poles of magnets face each other?
They experience attraction.
They experience repulsion.
They cancel out each other's magnetic fields.
They produce an electric current.
Which of the following is an example of a non- magnetic material?
Iron
Steel
Glass
Nickel
What is always true about the force between a magnet and a magnetic material?
It is always repulsive.
It is always attractive.
It depends on the pole of the magnet.
It depends on the shape of the material.
What is the process called when a material is placed in a magnetic field and becomes magnetic?
Demagnetization
Electrification
Induced magnetism
Polarization
Which of the following is an example of an application for temporary magnets?
Compasses
Fridges
Electric motors
Security tags that are always on
What is the purpose of a magnetic diagram?
To show the temperature of a magnet.
To show the strength and direction of a magnetic field.
To show the weight of a magnet.
To show the electrical conductivity of a material.
Where is the magnetic field typically strongest?
At the center of the magnet.
At the poles of the magnet.
Far away from the magnet.
In the middle of the field lines.
What unit is electric charge measured in?
Volts
Amperes
Coulombs
Ohms
Which of the following is an example of a conductor?
Rubber
Plastic
Wood
Metals
If the rod's end becomes positively charged after being rubbed, what happens to the cloth?
It becomes positively charged.
It remains neutral.
It becomes negatively charged.
It loses all charge.
What instrument can be used to distinguish between conductors and insulators?
A thermometer
A Gold-leaf electroscope (GLE)
A barometer
A voltmeter
How does electric field strength change with distance away from a charged object?
It increases with distance.
It remains constant.
It decreases with distance.
It fluctuates randomly.
For a negative charge point, how are the electric field lines drawn?
Radially outwards.
Radially inwards.
Parallel to each other.
In a spiral pattern.
What is electric current related to?
The flow of heat.
The flow of light.
The flow of charge.
The flow of magnetic fields.
What is the standard unit for electric current?
Volts (V)
Ohms (Ω)
Amps (A)
Watts (W)
What instrument is used to measure electric currents?
Voltmeter
Ohmmeter
Ammeter
Barometer
Which type of ammeter typically measures currents over a larger range (e.g., 0.1 - 5 amps)?
Digital ammeters
Analogue ammeters
Both digital and analogue ammeters
Neither type can measure large ranges.
What is transferred to charged particles (e.g., electrons) as they move around an electric circuit?
Thermal energy
Chemical energy
Electrical energy
Kinetic energy
What is the formula used to find e.m.f.?
E=Q×W
E= Q/W
E= W/Q
E= W+Q
What would be the p.d. across a resistor if 10 Joules of work were done to move 2 Coulombs of charge through it?
0.2 V
5 V
10 V
20 V
What does the resistance of a circuit component show?
Its ability to generate current.
Its opposition to the current flowing through it.
Its capacity to store charge.
Its material composition.
If a component has a resistance of 10 Ohms and a current of 2 Amps flows through it, what is the voltage across it?
5 V
12 V
20 V
0.2 V
What is the effect of increasing the length of a wire on its resistance?
It decreases resistance.
It increases resistance.
It has no effect on resistance.
It makes the wire a superconductor.
If an appliance has a power rating of 100W and is used for 10 hours, how much electrical energy (in Wh) has it transferred?
10 Wh
100 Wh
1000 Wh
10000 Wh
What is the power of a component that has 2 A of current flowing through it with a voltage of 12 V across it?
6 W
14 W
24 W
240 W
What do "Generators" do?
Convert electrical energy from mechanical energy.
Convert light into electrical energy.
Convert chemical energy into electrical energy.
Store energy in a magnetic field.
Where are "Ammeters" placed in a circuit and what do they measure?
In parallel, measure potential difference.
In series, measure resistance.
In series, measure the electric current in amps.
In parallel, measure power.
What is true about the current at every point in a series circuit?
It is different at each point.
It is shared among the components.
It is the same.
It depends on the resistance of each component.
If two 10-ohm resistors are connected in parallel, what is their combined resistance?
5 ohms
10 ohms
20 ohms
100 ohms
In which type of circuit would removing one component break the entire circuit, stopping current flow to all other components?
Parallel circuit
Series circuit
Both series and parallel circuits
Neither type of circuit
Which wire in a mains circuit is the terminal that carries the current back to the power source?
Live wire
Neutral wire
Earth wire
Ground wire
What is the direction of the induced current determined by?
Ohm's Law.
Lenz's Law.
Fleming's Right- Hand Rule.
Newton's Laws of Motion.
What fundamental principle does an a.c. generator use to create an a.c. current from mechanical energy?
Electrostatic induction
Electromagnetic induction
Electromechanical repulsion
Electrochemical reaction
What type of transformer has more turns on the secondary coil than on the primary coil?
A step-down transformer.
A 100% efficient transformer.
A step-up transformer.
A current transformer.
A transformer has 100 turns on its primary coil and 200 turns on its secondary coil. If the input voltage is 10V, what is the output voltage?
5V
10V
20V
40V
What type of quantity is electric charge?
Vector quantity.
Scalar quantity.
Tensor quantity.
Neither scalar nor vector.
What is the approximate value of the elementary charge 'e'?
1.6×10 10 Coulomb
1.6×10 −19 Coulomb
9.11×10 −31 Coulomb
6.022×10 23 Coulomb
How is the electrostatic force between any two charges related to the product of the two charges?
Inversely proportional.
Directly proportional.
Exponentially related.
Unrelated.
What is a key property regarding the intersection of two electric lines of force?
They always intersect at a right angle.
They intersect only at the charge.
They never intersect each other.
They intersect to indicate strong fields.
What is an 'Electric Dipole'?
Two equal and same charges placed at a distance.
Two unequal and opposite charges placed at a distance.
Two equal and opposite charges placed at a small distance between them.
A single positive charge in space.
What is the mathematical expression for Ohm's Law?
V=I+R
V=I/R
V=R×I
V=R−I
A conductor has a voltage of 6 V across it and a current of 2 A flowing through it. What is its resistance?
3 Ω
12 Ω
0.33 Ω
8 Ω
What is the value of 1 kilowatt hour (1 kWh) in Joules?
3.6×10 3 J
3.6×10 6 J
1×10 3 J
1×10 6 J
If a conductor has high resistivity, what does this imply about its conductivity?
It has high conductivity.
It has low conductivity.
Its conductivity is zero.
Its conductivity is infinite.
If an electrical heater has a resistance of 50 Ω and a current of 2 A flows through it, what is its power consumption?
100 W
200 W
25 W
5000 W
Which of these has the longest wavelength in the electromagnetic spectrum?
Gamma rays
Visible light
Radio waves
Microwaves
What type of waves are used in remote controls and thermal imaging cameras?
Ultra-violet rays
Gamma rays
Infra-red
Radio waves
The orderly distribution of electromagnetic waves (according to wavelength or frequency) in the form of distinct groups having widely differing properties is known as
spectrum
color
postulate
order
Which of the following is an example of a diamagnetic substance?
Iron
Aluminum
Copper
Nickel
What would be the efficiency of a transformer if its output power is 90 W and its input power is 100 W?
0.9%
9%
90%
111%
What is the S.I. unit of magnetic flux?
Tesla (T)
Ampere (A)
Weber (Wb)
Joule (J)
According to Faraday's Law, when is an induced e.m.f. produced?
Whenever current flows through a wire.
Whenever magnetic flux linked with a circuit changes.
Only when a magnet is moved very quickly.
Only when a coil is in a uniform magnetic field.
What principle is Lenz's Law a consequence of?
Conservation of charge.
Conservation of momentum.
Conservation of energy.
Conservation of mass.
A device that works on the principle of electromagnetic induction is a:
Battery
Resistor
Generator
Light bulb
What principle is the operation of a transformer based on?
Ohm's Law.
Lenz's Law.
Mutual induction.
Electromagnetic repulsion.
In a 'Step-up transformer,' how does the number of turns in the secondary coil (S) compare to the primary coil (P)?
S is less than P.
S is equal to P.
S is greater than P.
The number of turns is irrelevant.
Who performed the first precise measurement of the force between two electric charges?
Isaac Newton
Michael Faraday
Charles-Augustin De Coulomb
Alessandro Volta
What is the nature of Coulomb's force?
Always attractive.
Always repulsive.
May be attractive or repulsive.
Neither attractive nor repulsive.
In Direct Current (DC), what is characteristic of the electron movement?
Electrons move randomly.
Electrons move in alternating directions.
All electrons move in the same direction.
Electrons only move when a switch is open.
Which of the following is an example of Alternating Current (AC)?
Current from a car battery.
Power supply in- house.
Current from a solar panel.
Current from a flashlight battery.
Voltameter cannot be used to measure :
Current
Electrochemical equivalent
Potential difference
Charge
The laws of electromagnetic induction have been used in the construction of a:
Galvanometer
Voltmeter
Electric motor
Generator
The force that appears at a result of the interaction between two moving charges is called
Magnetic Force
Induced Force
Gravitational Force
Electrostatic Force
The direction of induced current is always so as to oppose the change which causes the current is called:
Faraday's law
Ohm's law
Kirchhoff's 1st rule
Lenz's law
A.C is converted into D.C by:
Transformer
Rectifier
Dynamo
Motor
Who proved that light waves are electromagnetic?
Enderson
Faraday
Maxwell
Einstein
Who is credited with the invention of the first electrometer?
Alessandro Volta
André-Marie Ampère
William Gilbert
Lord Kelvin
The Curie temperature is the temperature at which:
A material becomes superconducting
A material loses its ferromagnetic properties
A material becomes paramagnetic
A material becomes diamagnetic
The magnetic field lines around a current-carrying wire form:
Circles
Parabolas
Ellipses
Straight lines
