# CBSE Class 12 Physics Quiz! Test

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• 1.

### The name electricity is coined from the Greek word __________meaning amber

• A.

Elektron

• B.

Electron

• C.

Electrion

• D.

Elektrion

A. Elektron
Explanation
Elektron is a greek word that coins electricity

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• 2.

### _______________ offer resistance to the movement of charges which is intermediate between the conductors and insulators.

• A.

Dielectric

• B.

Nonconductors

• C.

Semiconductors

• D.

Nonmetals

C. Semiconductors
Explanation
They have temperature dependent charactertics

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• 3.

### The degree of _____________ is an indicator of the amount of charge.

• A.

Polarity

• B.

Divergence

• C.

Positive charge

• D.

Negative charge

B. Divergence
Explanation
When a charged object touches the metal knob at the top of the rod, charge flows on to the leaves and they

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• 4.

### Charge,e =

• A.

1.602192 × 10^–9 C

• B.

1.602192 × 10^–19 C

• C.

1.602192 × 10^+19 C

• D.

1.602192 × 10^+9 C

B. 1.602192 × 10^–19 C
Explanation
one coulomb is the charge flowing through a wire in 1 s if the current is 1 A (ampere)

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• 5.

### Coulomb used a torsion balance. A torsion balance is a sensitive device to measure ________.

• A.

Charge

• B.

Elecricity

• C.

Polarity

• D.

Force

D. Force
Explanation
Coulomb used torsion balance only for measuring the force between two charged metallic spheres

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• 6.

### The charge q, which tests the effect of a source charge, is called___________

• A.

Postive Charge

• B.

Negative charge

• C.

Auxilary charge

• D.

Test charge

D. Test charge
Explanation
The source charge Q must remain at its original location

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• 7.

### Electric field is a --------------field, since force is a------------ quantity

• A.

Vector,Vector

• B.

Scalar,Vector

• C.

Vector,Scaler

• D.

Scalar,Scalar

A. Vector,Vector
Explanation
"The term field in physics generally refers to a quantity that is
defined at every point in space and may vary from point to point."

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• 8.

### The picture of field lines was invented by Faraday,called---------

• A.

Line of Field

• B.

Line of force

• C.

Line of charge

• D.

Line of falls

B. Line of force
Explanation
"The picture of field lines was invented by Faraday to develop an
intuitive non- mathematical way of visualizing electric fields around charged configurations. Faraday called them lines of force."

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• 9.

### Two field lines can never cross each other.

• A.

True

• B.

False

A. True
Explanation
"If they did, the field at the point of intersection will not have a
unique direction, which is absurd."

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• 10.

### The field of the electric dipole is--------

• A.

Zero

• B.

Notzero

• C.

Uncertain

• D.

Infinity

B. Notzero
Explanation
The total charge of the electric dipole is obviously zero. This does notmean that the field of the electric dipole is zero

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• 11.

### A plane perpendicular to the dipole axis through its centre.

• A.

S-plane

• B.

Xy plane

• C.

Perpendicular plane

• D.

Equatorial plane

D. Equatorial plane
Explanation
The equatorial plane of the dipole,i.e., on a plane perpendicular to the dipole axis through its centre.

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• 12.

### The centres of positive charges and of negative charges lie at the same place,their dipole moment is -----------.

• A.

Uncertain

• B.

Zero

• C.

Not zero

• D.

Infinity

B. Zero
Explanation
In most molecules, the centres of positive charges and of negative charges lie at the same place. Therefore, their dipole moment is zero.

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• 13.

### The volume charge density also called as -----------

• A.

Field density

• B.

Volume density

• C.

Charge density

• D.

Charged density

C. Charge density
Explanation
sometimes simply called charge density

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• 14.

### ∆s Denotes---------

• A.

Vector area element

• B.

Electric field

• C.

Electric flux

• D.

Electric charge

A. Vector area element
Explanation
According to physical quantity it denotes vector area element

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• 15.

### Linear Charge density is --,surface Charge density is --,volume Charge density is --.

• A.

ρ,λ,σ

• B.

λ,ρ,σ

• C.

λ,σ,ρ

• D.

σ,ρ,λ

C. λ,σ,ρ
Explanation
conventional symbols

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• 16.

### Coulomb force and gravitational force follow the same ----------

• A.

Square law

• B.

Inverse square law

• C.

Inverse law

• D.

Newton's law

B. Inverse square law
Explanation
Coulomb force and gravitational force follow the same inverse-square law

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• 17.

### Superposition principle,there are ----additional three-body, four-body, etc., forces which arise only when there are more than two charges

• A.

Few

• B.

No

• C.

More

• D.

None of the above

B. No
Explanation
Based on Superposition principle.

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• 18.

### "The electric field due to a charge configuration with total charge zero is not zero; but for distances large compared to the size of the configuration, its field falls off faster than 1/r2, typical of field due to a single charge".Give example for above fact.

• A.

Electric charge

• B.

Electirc density

• C.

Electric dipole moment

• D.

Electric dipole

D. Electric dipole
Explanation
An electric dipole is the simplest example

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• 19.

### In a non-polar molecule, the centres of positive and negative charges coincide.

• A.

FALSE

• B.

TRUE

B. TRUE
Explanation
Nature of non-polar molecules.

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• 20.

### Two large plane parallel conducting plates separated by a small distance.

• A.

Parallel plane capacitors

• B.

Serial plate capacitors

• C.

Parallel plate capacitors

• D.

Serial plane capacitors

C. Parallel plate capacitors
Explanation
A parallel plate capacitor consists of two large plane parallel conducting plates.

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• 21.

### Which is typically the order of magnitude of currents in domestic appliances?

• A.

Ampere

• B.

Field

• C.

Mobility

• D.

Voltage

A. Ampere
Explanation
An ampere is defined through magnetic effects of currents

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• 22.

### A gram of water contains approximately 10^22 ------------

• A.

Electrons

• B.

Charged nuclei

• C.

Atom

• D.

Molecules

D. Molecules
Explanation
Bulk matter is made up of many molecules.

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• 23.

### A basic law regarding flow of currents was discovered by------------in 1828, long before the physical mechanism responsible for flow of currentswas discovered.

• A.

• B.

G.S. Ohm

• C.

Van de Graff

• D.

Kirchoff

B. G.S. Ohm
Explanation
based on ohm's bibliography

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• 24.

### I/A, is called --------

• A.

Current intensity

• B.

Magnetic field density

• C.

Current density

• D.

Magnetic field density

C. Current density
Explanation
j= I/A (i.e) current density

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• 25.

### The collisions of the electrons occur at regular intervals

• A.

False

• B.

True

A. False
Explanation
"since, the direction of the velocity of an electron is completely
random."

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• 26.

### Relaxation time is denoted using---------

• A.

σ

• B.

τ

• C.

λ

• D.

ρ

B. τ
Explanation
Standard denotion.

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• 27.

### Give an example of a material exhibiting behaviour such as relation between V and I is not unique

• A.

Glass

• B.

Pure water

• C.

NaCl

• D.

GaAs

D. GaAs
Explanation
In GaAs,there is more than one value of V for the same current I

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• 28.

### Which exhibit a very weak dependence of resistivity with temperature?

• A.

Nickel

• B.

Pure water

• C.

Nichrome

• D.

Iron

C. Nichrome
Explanation
which is an alloy of nickel, iron and chromium.

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• 29.

### State Ohmic loss

• A.

VxI

• B.

I^2 x R

• C.

IV∆t

• D.

IxR

B. I^2 x R
Explanation
Using ohm's law P=I^2 x R

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• 30.

### Emf is __________

• A.

Electromotive force

• B.

Electromagnetic force

• C.

Electromechnical force

• D.

Electricmechical force

A. Electromotive force
Explanation
General abbrevation

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• 31.

### Kirchhoff’s rules

• A.

Junction rule & loop rule

• B.

Junctional rule & loop rule

• C.

Mesh rule & node rule

• D.

Loop rule & node rule

A. Junction rule & loop rule
Explanation
Termed as junction & loop rule.

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• 32.

### The ------------ and its balance condition provide a practical method for determination of an unknown resistance

• A.

Ammetre

• B.

Potentiometre

• C.

Metre bridge

• D.

Wheatstone bridge

D. Wheatstone bridge
Explanation
It only uses balance condition to find the resistance

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• 33.

### Which one of these is used to measure internel resitance of a cell

• A.

Wheatstone bridge

• B.

Ammetre

• C.

Potentiometre

• D.

Metre bridge

C. Potentiometre
Explanation
For this the cell (emf e ) whose internal resistance (r) is to be determined isconnected across a resistance box through a key K2.

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• 34.

### __________= 1V/A

• A.

1℮

• B.

1Ω

• C.

• D.

B. 1Ω
Explanation
unit of resistance.

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• 35.

### The algebraic sum of changes in potential around any closed loop must be-----

• A.

Negative

• B.

Positive

• C.

Zero

• D.

All the above

C. Zero
Explanation
based on loop rule.

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• 36.

### Current is a Vector Quantity

• A.

FALSE

• B.

TURE

A. FALSE
Explanation
Current is a scalar although we represent current with an arrow.

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• 37.

### silver is a ---------conductor

• A.

Non

• B.

Heterogeneous

• C.

Non-Homogeneous

• D.

Homogeneous

D. Homogeneous
Explanation
silver consists of homogeneous molecules.

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• 38.

### Kirchhoff’s --------- is based on conservation of charge

• A.

Loop rule

• B.

Junction rule

• C.

Loop & junction rule

• D.

Either junction or loop rule

B. Junction rule
Explanation
since Bending or reorienting the wire does not change the validity of Kirchhoff’s junction rule.

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• 39.

### A current or a field (electric or magnetic) emerging out of the plane of the paper is depicted by -----

• A.

Dot

• B.

Cross

• C.

Both dot & cross

• D.

Neither cross nor dot

A. Dot
Explanation
According dot rule.

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• 40.

### The radius of the circular component of motion is called the radius of the -------.

• A.

Rectangular

• B.

Circular

• C.

Helix

• D.

Hyperbola

C. Helix
Explanation
Due to generic motion

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• 41.

### The cyclotron uses----------- to increase the energy of charged particles.

• A.

Electric field

• B.

Magnetic field

• C.

Magnetostatic field

• D.

Both electric &magnetic fields

D. Both electric &magnetic fields
Explanation
both electric and magnetic fields in combination is used to increase the energy of charged particles.

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• 42.

### In cyclotron, as the fields are perpendicular to each other are called ------------

• A.

Perpendicular field

• B.

Crossed fields

• C.

Cyclotron field

• D.

Magnetic field

B. Crossed fields
Explanation
There are generally called as crossed fields.

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• 43.

### VECC is------

• A.

Variable energy cyclotron center

• B.

variation energy cyclotron center

• C.

Variant energy cyclotron center

• D.

Various energy cyclotron center

A. Variable energy cyclotron center
Explanation
Since the variable energy cyclotron was build in VECC, kolkata.

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• 44.

### In Biot-Savart’s law the relation between --------- and ------- field it produces.

• A.

Current & electric

• B.

Current & magnetic

• C.

Electric & magnetic

• D.

Magnetic& dielectric

B. Current & magnetic
Explanation
based on biot savart law's statement

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• 45.

### According to  amperain loop, B is -----------

• A.

Only tangential

• B.

Only normal

• C.

Tangential or normal

• D.

Both tangential and normal

C. Tangential or normal
Explanation
based on assumption made in amperian loop B is tangetial or normal or vanish.

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• 46.

### Ampere's circuital law holds for----------

• A.

• B.

• C.

Flucuating current

• D.

Flucuating voltage

Explanation
According to ampere circuital alw

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• 47.

### Television uses the --------- to generate the magnetic fields needed.

• A.

Toroid or solenoid

• B.

Both solenoid & toroid

• C.

Toroid

• D.

Solenoid

D. Solenoid
Explanation
Television only uses solenoid.

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• 48.

### Parallel currents repel, and anti-parallel currents attract.

• A.

TRUE

• B.

FALSE

B. FALSE
Explanation
opppositely directed currents repel each other.

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• 49.

### The resembalance of magnertic field lines for abar magnet and a ------------- suggest that a bar magnet may be thought of as a large number of circulating current in analogy with a ----------.         HINT:bar magnet as an equalent solenoid.

• A.

Solenoid, toroid

• B.

Toroid,toroid

• C.

Solenoid,solenoid

• D.

Toroid, solenoid

C. Solenoid,solenoid
Explanation
bar magnet as an equalent solenoid.

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• 50.

### The magnet field lines gives us an approximate idea of the magnetic field B.

• A.

Pattern of electric fillings

• B.

Pattern of magnetic fillings

• C.

Pattern of dipole fillings

• D.

Pattern of iron fillings Back to top