InstaQB

Home
Institutions
- Institutions
  
  Polytechnic Colleges
  
  Medical Colleges
  
  Arts & Science Colleges
  
  Universities
  
  Engineering Colleges
  
  Agricultural Colleges
  
  Research Institute
  
  Law Colleges
  
  Audiology and Speech Colleges
  
  Business & Management colleges
  
  Nursing colleges
  
  Hotel Management institutes
  
  Aeronautical Colleges
  
  Bachelor's Degree
Syllabus
Courses
Stateboard
- 12th Standard English Medium
  
  Maths
  
  Physics
  
  Chemistry
  
  Biology
  
  Computer Science
  
  Business Maths
  
  Economics
  
  Commerce
  
  Accountancy
  
  History
  
  Computer Applications
  
  Computer Technology
  12th Standard Tamil Medium
  
  உயிரியல்
  
  கணினி பயன்பாடுகள்
  
  கணினி அறிவியல்
  
  வணிகக் கணிதம்
  
  வணிகவியல்
  
  பொருளியல்
  
  கணிதவியல்
  
  வேதியியல்
  
  இயற்பியல்
  
  கணினி தொழில்நுட்பம்
  
  வரலாறு
  
  கணக்குப்பதிவியல்
  11th Standard English Medium
  
  Maths
  
  Commerce
  
  Economics
  
  Biology
  
  Business Maths
  
  Accountancy
  
  Computer Science
  
  Physics
  
  Chemistry
  
  Computer Applications
  
  History
  
  Computer Technology
  
  Bio - Zoology
  11th Standard Tamil Medium
  
  கணிதவியல்
  
  உயிரியல்
  
  பொருளியல்
  
  இயற்பியல்
  
  வேதியியல்
  
  வணிகக் கணிதம்
  
  கணினி அறிவியல்
  
  கணக்குப்பதிவியல்
  
  வணிகவியல்
  
  கணினி பயன்பாடுகள்
  10th Standard English Medium
  
  Mathematics
  
  Science
  
  Social Science
  
  9th Standard English Medium
  
  Mathematics
  
  Science
  
  Social Science
  
  8th Standard English Medium
  
  Mathematics
  
  Science
  
  Social Science
  7th Standard English Medium
  
  Mathematics
  
  Science
  
  Social Science
ICSE/ISC
- Class XII
  
  Mathematics
  
  Physics
  
  Accountancy
  
  Biology
  
  History
  
  Geography
  
  Psychology
  
  chemistry
  
  Economics
  
  Computer Science
  
  Political Science
  
  Business Studies
  Class XI
  
  Accountancy
  
  Chemistry
  
  Mathematics
  
  Biology
  
  Geography
  
  Physics
  
  History
CBSE
- 12Th Standard
  
  Physics
  
  Chemistry
  
  Maths
  
  Biology
  
  History
  
  Economics
  
  Commerce
  
  Geography
  
  Socialogy
  
  Business Studies
  
  Computer Science
  
  Biotechnology Class
  
  Political Science
  
  Home Science
  11Th Standard
  
  Physics
  
  Chemistry
  
  Maths
  
  Biology
  
  History
  
  Economics
  
  Commerce
  
  Socialogy
  
  Business Studies
  
  Geography
  
  Home Science
  
  Computer Science
  
  Biotechnology Class
  
  Political Science
  10Th Standard
  
  Physics
  
  Chemistry
  
  Biology
  
  Mathematics
  
  Economics
  
  Geography
  
  History & Civics
  
  Computer Application
  9Th Standard
  
  Physics
  
  Chemistry
  
  Biology
  
  mathematics
  
  Computer Application
  
  Economics
  
  Geography
  
  History & Civics

12th Physics weekly Test - 3 ( Electrostatics )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test - 3 ( Electrostatics )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

Near a charged object A another earthed object B is placed. Charges are induced on B. If B is removed. After that the charge on A ________.

remains the same
decreases
increases
becomes zero

For a large charge accumulation, the end of the conductor should have larger curvature that is_________.

bigger radius
Smaller radius
maximum radius
less bent

Find the electric field at x =5m from the graph.

2 V/m
-2.5 V/m
2/5 V/m
-2/5 V/m

A Gaussian surface in the figure is shown by dotted line. The electric field on the surface will be

due to q₁ and q₂ only
due to q₂ only
zero
due to all

The repulsive force between two like charges of 1 coulomb each separated by a distance of 1 m in vacuum is equal to :

9 x 10⁹ N
10⁹ N
9 x 10^-9 N
9 N

A point charge q is placed at a distance a/2 directly above the centre of a square of side 'a'.The electric flux through the square is

\(\frac { q }{ { \varepsilon }_{ 0 } } \)
\(\frac { q }{ { \pi \varepsilon }_{ 0 } } \)
\(\frac { q }{ {4 \pi \varepsilon }_{ 0 } } \)
\(\frac { q }{ {6 \pi \varepsilon }_{ 0 } } \)

Two charges are kept at a distance in air what should be the relative permittivity of the medium in which the two charges should be kept at the same distance so that they experience half of the force which they experienced in air?

\(\frac{1}{2}\)
\(\frac{1}{0.2}\)
2
0.2

The value of \(\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \) is _____

9x10⁹Nm²C^-2
8.85x10^-12N m² C^-2
9x10^-9Nm²C^-2
8.85x10⁹NC^-2

The electric flux is negative, if the angle between \(\vec{dA}\) and \(\vec{E}\) is

Less than 90°
greater than 90°
equal to 90°
equal to 0°

__________ is a very large unit of capacitance.

Farad
Microfarad
Picofarad
Nanofarad

The electric field created by a _________ is basically a non-uniform electric field.

Test charge
Positive charge
Negative charge
Point charge

Electric lines of force ________.

intersect each other
never intersect
intersect at infinity
are always parallel

Gauss law is another form of ________.

Newton's law
Kepler's law
Ohm's law
Coulomb's law

The dipole is called point dipole when the distance

2a approaches infinity and q approaches zero
2a approaches zero and q approaches infinity
2a approaches zero and q approaches zero
2a approaches infinity and q approaches infinity

The value of constant 'K' in coulomb law is

0.9 x 10⁹ Nm² C²
9 x 10^-9 Nm²C²
9 x 10⁹ Nm^-2 C^-2
9 x 10⁹ Nm² C^-2

The force between two charges at a particular distance in air is 36 N. If the distance between the charges is filled by a medium of dielectric constant 6, then the force is__________.

216 N
6 N
30 N
24 N

Electric field intensity at a point due to an infinite sheet of charge having surface charge density σ is E. If the sheet were conducting, electric intensity would be

\(\frac{E}{2}\)
E
2E
4E

Van de Graaff generator produces an electrostatic potential difference of_______ volts.

10⁸
10⁹
10⁷
10¹⁰

The lower comb of van de graaff generator is maintained at a positive potential of

10 kV
10⁷ V
100 V
10³ V

The concentric spheres of radii R and r have similar charges with equal surface densities (σ). What is the electric potential at their common centre?

\(\frac { \sigma }{ { \varepsilon }_{ 0 } } (R-r)\)
\(\frac { \sigma }{ { { \varepsilon }_{ 0 } } } (R+r)\)
\(R\frac { \sigma }{ { \varepsilon }_{ 0 } } \)
\(\frac { \sigma }{ { \varepsilon }_{ 0 } } \)

An isolated metal sphere of radius 'r' is given a charge' q'. The potential energy of the sphere is

\(\frac{q^2}{4πε_0r}\)
\(\frac{q}{4πε_0r}\)
\(\frac{q}{8πε_0r}\)
\(\frac{q^2}{8πε_0r}\)

The magnitude of electric dipole moment of water molecule is

6 x 10^-30 cm
6.2 x 10^-30 cm
6.1 x 10^-30
5.95 10^-30 cm

Which of the following is a scalar quantity?

electric dipole moment
electric field intensity
electric potential
current density

Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10^-2 C and 5 x 10^-2 C respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is

3 × 10^-2 C
4 × 10^-2 C
1 × 10^-2 C
2 × 10^-2 C

When the amber is rubbed with fur, it absorbs bits of papers. This was invented by_______.

Amber
Thales
Gilbert
Benjamin Franklin

For sharper edge, the ______ is greater. This principle is used in Lightning arrestor

linear charge density
surface charge density
volume charge density
capacitance

_______ and Coulomb's law form fundamental principles of electrostatics

Newton's law of gravitation
superposition principle
ohm's law
Kepler's law

The intensity of electric field at a point is

the force experienced by a charge q
the work done in bringing unit positive charge from infinity to that point
the positive gradient of the potential
the negative gradient of the potential

The electrostatic force obeys _______.

Newton's I law
Newton's II law
Newton's III law
none of the above

Which of the following cannot be the units of electric field intensity?

NC^-1
Vm^-1
JC^-1/m
JC^-1

Comment

Add Comment

Tamilnadu Stateboardszs - Class