Physics Unit 1 to 5 Test

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Questions and Answers

Two charged spheres are separated by a distance d and exert a force F on each other. If charges are doubled and distance between them is also doubled then the force is -

F/4

F (correct)

F/2

The relation between electric field E and potential V is -

V = dE/dx

E = -dV/dx

V = dE/dv

E = dV/dx (correct)

If a dielectric be introduced between the plates of a parallel plate capacitor then the value of capacitance

Decreases

Increases (correct)

None

Remains same

Which one of the following is the unit of electric field?

N/C Signup and view all the answers

1V is equal to -

1 J/1 C Signup and view all the answers

The value of absolute permittivity is –

8.85 X 10-12 C²N⁻¹m⁻² Signup and view all the answers

Which one is the not correct expression for energy stored in a capacitor

QV² Signup and view all the answers

SI unit of electric flux is

NC⁻¹m² Signup and view all the answers

An electric charge q is placed at the centre of a cube of side a, the electric flux on one of its faces will be

q/6ε₀ Signup and view all the answers

Three capacitors each of capacity C are added in series. Then the equivalent capacitance will be -

1/3C Signup and view all the answers

Which material has highest electric conductivity?

Silver Signup and view all the answers

Ohm's law is valid when the temperature of conductor is

Constant Signup and view all the answers

The specific resistance of a rod of copper as compared to that of thin wire of copper is –

Same Signup and view all the answers

Kirchoff's junction rule is based on the conservation of -

Charge Signup and view all the answers

For ohmic conductor the relation between drift velocity Va and electric field E is –

VaE Signup and view all the answers

Why is the wheatstone bridge is more accurate than other methods of measuring resistance?

It is a null method Signup and view all the answers

By increasing the temperature the resistance of conductor -

Increases Signup and view all the answers

The Sl unit of resistivity is

Ωm Signup and view all the answers

The expression for Lorentz force is –

F = q[Ẻ + (B × V)] Signup and view all the answers

Two parallel conductors carrying current in same direction will -

Attract each other Signup and view all the answers

The Sl unit of magnetic field is

tesla Signup and view all the answers

The force on current carrying conductor in magnetic field is maximum when angle between current and magnetic field is -

90° Signup and view all the answers

What is the value of angle of dip at magnetic equator?

0° Signup and view all the answers

A galvanometer can be converted into an ammeter by -

Introducing a shunt of small value in parallel Signup and view all the answers

The polarity of induced emf is found by -

Lenz's law Signup and view all the answers

Lenz's law is a consequence of the law of conservation of -

Energy Signup and view all the answers

Sl unit of mutual inductance is -

Henry Signup and view all the answers

The relation between number of turns of primary coil and secondary coil of step up transformer is

N1 >> N2 Signup and view all the answers

For an inductor coil the phase difference between current and voltage is -

90° Signup and view all the answers

The expression for speed of electromagnetic waves is

1/√(μ₀ε₀) Signup and view all the answers

Which of the following having minimum wavelength

Gamma rays Signup and view all the answers

Cyclotron is used to accelerate

Positive ions Signup and view all the answers

Study Notes

Unit 1 to 5 (Test) - Physics

Force between two charged spheres: If two charged spheres are separated by a distance d and exert a force F on each other, doubling the charges and the distance will result in a force of 4F.
Relationship between electric field and potential: The relationship between electric field (E) and potential (V) is E = -dV/dx.
Capacitance of a parallel plate capacitor with dielectric: Introducing a dielectric between the plates of a parallel plate capacitor increases its capacitance.
Unit of electric field: The unit of electric field is N/C (newtons per coulomb).
Absolute permittivity: The value of absolute permittivity is 8.85 x 10⁻¹² C²/N⋅m².
Energy stored in a capacitor: The correct expressions for energy stored in a capacitor are 1/2CV² and Q²/2C, where C is capacitance, V is voltage, and Q is charge.
SI unit of electric flux: The SI unit of electric flux is N⋅m²/C.
Electric flux on a face of a cube: An electric charge placed at the center of a cube of side a will have an electric flux of q/(ε₀) on one of its faces.
Kirchhoff's junction rule: Kirchhoff's junction rule is based on the conservation of charge.
Equivalent capacitance in series: The equivalent capacitance of three capacitors each with capacity C connected in series is C/3.
Material with highest electrical conductivity: Copper has the highest electrical conductivity among the listed options (copper, aluminum, iron, silver).
Validity of Ohm's Law: Ohm's law is valid when the temperature of a conductor is constant.
Specific resistance of a copper rod: The specific resistance of a copper rod is the same compared to that of a thin copper wire.
Relation between drift velocity and electric field: For an ohmic conductor, the relation between drift velocity (Va) and electric field (E) is Va ∝ E.
Wheatstone bridge accuracy: A Wheatstone bridge is a more accurate method of measuring resistance because it is a null method.
Resistance and temperature: Increasing the temperature of a conductor increases its resistance.
SI unit of resistivity: The SI unit of resistivity is Ω⋅m.
Lorentz force expression: The expression for Lorentz force is F = q(E + v × B).
Effect of current direction on parallel conductors: Parallel conductors carrying current in the same direction attract each other.
SI unit of magnetic field: The SI unit of magnetic field strength is tesla (T).
Magnetic elements of Earth: Magnetic declination, magnetic inclination, and the horizontal component of the Earth's magnetic field are magnetic elements of the Earth.
Path of electron in a uniform magnetic field: When an electron enters a uniform magnetic field perpendicularly, its path is circular.
Ampere's circuital law: Ampere's circuital law states that § B ⋅ dl = μ₀I.
Maximum force on a current-carrying conductor: The maximum force on a current-carrying conductor in a magnetic field occurs when the angle between the current and the magnetic field is 90 degrees.
Angle of dip at magnetic equator: The angle of dip at the magnetic equator is 0°.
Converting a galvanometer to an ammeter: A galvanometer can be converted into an ammeter by connecting a shunt resistor in parallel with the galvanometer.
Polarity of induced emf: Lenz's law determines the polarity of an induced emf.
Relation between turns in a step-up transformer: In a step-up transformer, the number of turns in the secondary coil (N₂) is greater than the number of turns in the primary coil (N₁).
Phase difference in an inductor: The phase difference between the current and voltage in an inductor is 90°.
Expression for speed of electromagnetic waves: The expression for the speed (v) of electromagnetic waves is 1/√(μ₀ε₀), where μ₀ is the permeability of free space and ε₀ is the permittivity of free space.
SI unit of mutual inductance: The SI unit of mutual inductance is the henry (H).
Relationship between turns in different coils of a transformer: The relationship between the number of turns in the primary and secondary coils of a step-up transformer is N₂ > N₁.
Wavelength of different types of electromagnetic waves: Gamma rays have the shortest wavelength among the listed types (microwaves, UV rays, gamma rays, visible light).

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Test your knowledge on fundamental physics concepts from units 1 to 5, including the forces between charged objects, electric fields, capacitance, and energy storage in capacitors. This quiz covers key relationships and formulas that are essential for understanding electrostatics.