Showing posts with label class12-Physics. Show all posts
Showing posts with label class12-Physics. Show all posts

Friday 25 May 2018

CBSE Class 12 - Physics - Electromagnetic Waves - Important Theory Questions (#cbsenotes)(#eduvictors)

Electromagnetic Waves

(Important Theory Questions)
CBSE Class 12 - Physics - Electromagnetic Waves - Important Theory Questions (#cbsenotes)(#eduvictors)


1. Explain the inadequacy of Ampere's circuital law

2. Describe Hertz experiment to demonstrate the production of electromagnetic waves

3. Write the properties of electromagnetic waves.

4. Write any five electromagnetic waves in the order of decreasing frequency and write any two properties and uses of each

5. Deduce an expression for velocity of em waves in vacuum.

6. Establish the transverse nature of electromagnetic waves.

7. Compare the properties of electromagnetic waves and mechanical waves.

Friday 18 May 2018

CBSE Class 12 - Physics - Alternative Current - Important Theory Questions (#cbsenotes)(#eduvictors)

Alternative Current

(Important Theory Questions)

CBSE Class 12 - Physics - Alternative Current - Important Theory Questions (#cbsenotes)(#eduvictors)


1. Describe the principle construction and working of an AC generator. Draw neat labeled diagram

2. Define mean value of AC(over a half cycle) and derive an expression for it.

3. Define RMS value of AC and derive an expression for it. ()

4. Show that the average value of AC over a complete cycle is zero.

5. Show that the current and voltage are in phase in an ac circuit containing resistance only.


Friday 11 May 2018

CBSE Class 12 - Physics - Electromagnetic Induction (EMI) - Important Theory Questions (#cbsenotes)(#eduvictors)

Electromagnetic Induction (EMI)

(Theoretical Questions Assignment)

CBSE Class 12 - Physics - Electromagnetic Induction (EMI) - Important Theory Questions (#cbsenotes)(#eduvictors)

1. State and Explain Faraday's laws of electromagnetic induction.()

2. State Lenz' Law and show that it is in accordance with the law of conservation of energy.

3. Use Lenz' law to find the direction of induced emf in a coil when
(a) a north pole is brought towards the coil
(b) north pole taken away from the coil
(c) A south pole isbrought towards the coil and
(d) a south pole is taken away from the coil,
Draw illustrations in each case.

Monday 7 May 2018

CBSE Class 12 - Physics - Magnetic Effect of Current - Important Theory Questions (#cbsenotes)(#eduvictors)

Magnetic Effect of Current 

(Theoretical Questions)
CBSE Class 12 - Physics - Magnetic Effect of Current - Important Theory Questions (#cbsenotes)(#eduvictors)

1. State Biot- Savart law and apply it to find the magnetic field due to a circular loop carrying current at a point (a) at its centre (b) on the axis


2. State Ampere's circuital law and apply it to find the magnetic field (a) inside a current carrying solenoid (b) inside a current carrying toroid.


3. Apply Ampere's circuital law to determine the magnetic field at a point due to a long straight current carrying conductor.


4. Derive an expression for the force on a current carrying conductor in a uniform magnetic field

Saturday 5 May 2018

CBSE Class 12 - Physics - Current Electricity - Important Theory Questions (#cbsenotes)(#eduvictors)

Current Electricity 
Important Theory Questions

CBSE Class 12 - Physics - Current Electricity - Important Theory Questions (#cbsenotes)(#eduvictors)


1. Define drift velocity and derive an expression for it.


2. Derive the expression I=nAevd


3. Deduce Ohm's law from elementary ideas and hence write an expression for resistance and resistivity.


4. Derive an expression for conductivity in terms of mobility


Friday 4 May 2018

CBSE Class 12 - Physics - Electrostatics - Important Theory Questions (#cbsenotes)(#eduvictors)

Electrostatics - Important Theory Questions


1. Derive an expression for the electric field at a point on the axial position of an electric dipole.

2. Derive an expression for the electric field at a point on the equatorial position of an electric dipole.

3. Describe the Principle, construction and working of Van de Graff generator.

4. Derive an expression for the energy stored in a capacitor. Show that whenever two conductors share charges by bringing them into electrical contact, there is a loss of energy.

5. Derive an expression for the effective capacitance when capacitors are connected in
(a) series and
(b) parallel

6. Explain the principle of a capacitor and derive an expression for the capacitance of a parallel plate capacitor.

Tuesday 19 December 2017

CBSE Class 12/Class 11/Class 9 - DISCOVERIES IN ATOMIC STRUCTURE (#eduvictors)(#cbsenotes)

DISCOVERIES IN ATOMIC STRUCTURE

CBSE Class 12/Class 11/Class 9 - DISCOVERIES IN ATOMIC STRUCTURE (#eduvictors)(#cbsenotes)

1. Dalton(1803) : Proposed Atomic Theory

2. Julius Plucker (1859) : First discoverer of cathode rays

3. Goldstein(1886) : Discovered anode rays and proton

4. Sir.J.J.Thomson(1897) : Discovered electron and determined charge/mass(e/m) ratio for electron

5. Rutherford(1891) : Discovered nucleus and proposed atomic model

Saturday 14 October 2017

CBSE Class 12 - Physics - Chapter 9 - Electronics Devices - Revision Sheet (#cbseNotes)

CHAPTER 9 - ELECTRONIC DEVICES - REVISION ASSIGNMENT 

CBSE Class 12 - Physics - Chapter 9 - Electronics Devices - Revision Sheet (#cbseNotes)


1 MARK QUESTIONS

1.  In a semiconductor which of the following carries can contribute to the current?
(a) Electrons
(b) Holes
(c) Both
(d) None

2. A semiconductor diode has ______
(a) One PN junction
(b) Two PN junctions
(c) Three PN junctions
(d) Four PN junctions

3. If the arrow of diode symbol is positive with respect to bar, then the diode is ______ biased

4.  The DC resistance of a diode is _______ its AC resistance.

5. If the temperature of the diode increases,then leakage current ________.

Friday 8 September 2017

CBSE Class 10 - Light - Reflection From Mirrors (Worksheet) (#cbseNotes)

Light - Reflection From Mirrors (Worksheet)

CBSE Class 10 - Light - Reflection From Mirrors (Worksheet) (#cbseNotes)



1. We get a diminished image with a concave mirror when the object is placed ____.


2. The drivers mirror used in automobiles is ____.


3. The distance of focus F from the pole P is termed as the ..................... of the mirror.


4. Mirror formula is ____.


Wednesday 21 June 2017

Wednesday 24 May 2017

CBSE CLASS 12 - PHYSICS - RAY OPTICS AND OPTICAL INSTRUMENTS - Very Short Question Answers (#cbsenotes)

RAY OPTICS AND OPTICAL INSTRUMENTS

CBSE CLASS 12 - PHYSICS
CBSE CLASS 12 - PHYSICS - RAY OPTICS AND OPTICAL INSTRUMENTS - Very Short Question Answers (#cbsenotes)

Very Short Question Answers



Q1: What is the focal length and power of a plane glass plate?

Answer: Focal length of plane glass is infinite and its power = 0.


Q2: What is the mathematical relation between object distance (p) and image distance (i) in a plane mirror?

Answer: i = -p


Q3: An object is placed at the focus of  concave lens. Where will its image be formed? 

Answer: The real image will be formed at infinity.


Q4: If the speed of light were the same in all media, would refraction still occur when light passes from one medium to another? 

Answer: No change in speed of light causes bending of light rays in refraction.


Monday 15 May 2017

CBSE Class 12 - Physics -Syllabus and Q Paper Design (2017-18)

Physics -Syllabus (2017-18)


CBSE Class 12 Physics

CBSE Class 12 - Physics -Syllabus and Q Paper Design  (2017-18)

Here presents the prescribed syllabus for Class 12 Physics for the curriculum 2017-18.


Friday 31 March 2017

CBSE Class 12 - Physics - Electrostatic Potential and Capacitance (Short Q and A) (#cbsenotes)

Electrostatic Potential and Capacitance 

CBSE Class 12 - Physics 
(Short Q and A)
CBSE Class 12 - Physics - Electrostatic Potential and Capacitance (Short Q and A) (#cbsenotes)


Q1: Define Electrostatic Potential.

Answer: The electrostatic potential at a point is defined as amount of work done per unit positive test charge in moving the test charge from infinity to that point against the electrostatic force due to the electric field.
Q4: Is electric potential a scalar quantity or vector quantity?


Q2: Name the physical quantity whose SI unit is Joule coulomb⁻ⁱ?

Answer:  Electric potential


Q3: Does the electric potential increase or decrease along the electric line of force?

Answer: It decreases along the electric line of force.


Q4: Is electric potential a scalar quantity or vector quantity?

Answer: Scalar quantity


Wednesday 18 May 2016

Class 12 - Physics - Chapter 4: Moving Charges and Magnetism (VSQA)

Moving Charges and Magnetism

Very Short Q & A

Class 12 - Physics - Chapter 4: Moving Charges and Magnetism (VSQA)

Q1: Define Magnetic Field.

Answer: The space around a magnet within which its effect is experienced is called Magnetic Field (B).


Q2: What is the SI unit of magnetic field?

Answer: Tesla. Another unit is Newton Ampere-1 metre-1


Q3: What is a solenoid?

Answer: A solenoid is a circular coil of a large number of turns, such that the turns of solenoid run parallel to its length. It acts similar to a bar magnet.


Q4: What is Lorentz force?

Answer: The total force on a charge (q) moving with a velocity (v) in the presence of magnetic and electric field (B and F) respectively is called Lorentz force.


Q5: What is a cyclotron?

Answer: It is a machine to accelerate charged particles or ions to high energies


Q6: What is the operational definition of one ampere?

Sunday 20 March 2016

CBSE Class 12 - Physics - Electric Charges And Fields - Very Short Q and A

Electric Charges And Fields

Very Short Q and A

CBSE Class 12 - Physics - Electric Charges And Fields - Very Short Q and A
Charging By Induction
credits:openclipart


Q1: Define frictional electricity.

Answer: It is the electricity developed on bodies when they rubbed against each other.


Q2: What is the smallest amount of charge?

Answer: Charge on an electron or proton is ± 1.62 × 10-19 C


Q3: State the two basic properties of electric charge?

Answer:  i. Electric charge is quantised.
ii. Electric charge is always conserved.



Q4: Define Dielectric constant.

Answer: The Dielectric constant of a medium is the ratio of the force between two charges placed at a certain distance apart in vacuum(or air) to the force between the same two charges at the same distance apart in that medium.


Q5: What is induction?

Answer: It is a process of charging a body without making physical contact.