Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Important Questions for PUC Karnataka Science Class 12 - Department of Pre-University Education, Karnataka - Physics

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Define the term 'conductivity' of a metallic wire. Write its SI unit.

Appears in 9 question papers
Chapter: [2.01] Current Electricity
Concept: Electrical Resistivity and Conductivity

Draw a labelled diagram of an ac generator. 

Appears in 5 question papers
Chapter: [4.02] Electromagnetic Induction
Concept: Ac Generator

Obtain the expression for the emf induced in the rotating coil of N turns each of cross-sectional area A, in the presence of a magnetic field `vecB` .

Appears in 5 question papers
Chapter: [4.02] Electromagnetic Induction
Concept: Ac Generator

A ray of light passing from air through an equilateral glass prism undergoes minimum deviation when the angle of incidence is 3/4 th of the angle of prism. Calculate the speed of light in the prism. 

Appears in 5 question papers
Chapter: [6.01] Ray Optics and Optical Instruments
Concept: Refraction Through a Prism

Define self-inductance of a coil.

Appears in 4 question papers
Chapter: [3.02] Moving Charges and Magnetism
Concept: Solenoid and the Toroid - the Solenoid

State Huygen's principle.

Appears in 4 question papers
Chapter: [6.02] Wave Optics
Concept: Huygens Principle

Does the charge given to a metallic sphere depend on whether it is hollow or solid? Give reason for your answer.

Appears in 3 question papers
Chapter: [1.02] Electric Charges and Fields
Concept: Basic Properties of Electric Charge

How does Ampere-Maxwell law explain the flow of current through a capacitor when it is being charged by a battery? 

Appears in 3 question papers
Chapter: [1.02] Electric Charges and Fields
Concept: Electric Charges

A long straight current carrying wire passes normally through the centre of circular loop. If the current through the wire increases, will there be an induced emf in the loop? Justify.

Appears in 3 question papers
Chapter: [2.01] Current Electricity
Concept: Cells, Emf, Internal Resistance

Name the junction diode whose I-V characteristics are drawn below: 

Appears in 3 question papers
Chapter: [2.01] Current Electricity
Concept: V-I Characteristics (Linear and Non-linear)
A wire whose cross-sectional area is increasing linearly from its one end to the other, is connected across a battery of V volts.
Which of the following quantities remain constant in the wire?
(a) drift speed
(b) current density
(c) electric current
(d) electric field
Appears in 3 question papers
Chapter: [2.01] Current Electricity
Concept: Drift of Electrons and the Origin of Resistivity

The current is drawn from a cell of emf E and internal resistance r connected to the network of resistors each of resistance r as shown in the figure. Obtain the expression for

  1. the current draw from the cell and
  2. the power consumed in the network.

Appears in 3 question papers
Chapter: [2.01] Current Electricity
Concept: Kirchhoff’s Rules

Write the expression, in a vector form, for the Lorentz magnetic force \[\vec{F}\] due to a charge moving with velocity \[\vec{V}\] in a magnetic field \[\vec{B}\]. What is the direction of the magnetic force? 

Appears in 3 question papers
Chapter: [3.02] Moving Charges and Magnetism
Concept: Force on a Moving Charge in Uniform Magnetic and Electric Fields

At a place, the horizontal component of earth's magnetic field is B and angle of dip is 60°. What is the value of horizontal component of the earth's magnetic field at equator?

Appears in 3 question papers
Chapter: [3.02] Moving Charges and Magnetism
Concept: Magnetic Field on the Axis of a Circular Current Loop

Why is it necessary to introduce a radial magnetic field inside the coil of a galvanometer?

Appears in 3 question papers
Chapter: [3.02] Moving Charges and Magnetism
Concept: Moving Coil Galvanometer

(i) Find the value of the phase difference between the current and the voltage in the series LCR circuit shown below. Which one leads in phase : current or voltage ?

(ii) Without making any other change, find the value of the additional capacitor C1, to be connected in parallel with the capacitor C, in order to make the power factor of the circuit unity.

Appears in 3 question papers
Chapter: [4.01] Alternating Current
Concept: Ac Voltage Applied to a Series Lcr Circuit

A power transmission line feeds input power at 2200 V to a step-down transformer with its primary windings having 300 turns. Find the number of turns in the secondary to get the power output at 220 V.

Appears in 3 question papers
Chapter: [4.01] Alternating Current
Concept: Transformers

How is the speed of em-waves in vacuum determined by the electric and magnetic field?

Appears in 3 question papers
Chapter: [5.01] Electromagnetic Waves
Concept: Electromagnetic Waves

Mrs. Rashmi Singh broke her reading glasses. When she went to the shopkeeper to order new spects, he suggested that she should get spectacles with plastic lenses instead of glass lenses. On getting the new spectacles, she found that the new ones were thicker than the earlier ones. She asked this question to the shopkeeper but he could not offer satisfactory explanation for this. At home, Mrs. Singh raised the same question to her daughter Anuja who explained why plastic lenses were thicker. 

(a) Write two qualities displayed each by Anuja and her mother.

(b) How do you explain this fact using lens maker's formula?

Appears in 3 question papers
Chapter: [6.01] Ray Optics and Optical Instruments
Concept: Lensmaker's Formula

Distinguish between unpolarized light and linearly polarized light

Appears in 3 question papers
Chapter: [6.02] Wave Optics
Concept: Plane Polarised Light
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