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Important Questions for ISC (Science) Class 12 - CISCE - Physics (Theory)

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Write two important advantages of reflecting telescope over a refracting telescope.

Appears in 12 question papers
Chapter: [6.01] Ray Optics and Optical Instruments
Concept: Optical Instruments > Telescope

Give the truth table and circuit symbol for NAND gate

Appears in 10 question papers
Chapter: [9] Electronic Devices
Concept: Digital Electronics and Logic Gates

Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.

Appears in 6 question papers
Chapter: [5] Electromagnetic Waves
Concept: Electromagnetic Spectrum

Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision

Appears in 5 question papers
Chapter: [6.01] Ray Optics and Optical Instruments
Concept: Optical Instruments > The Microscope

State de Broglie hypothesis

Appears in 5 question papers
Chapter: [7] Dual Nature of Radiation and Matter
Concept: de-Broglie Relation

Draw a labelled circuit diagram of a potentiometer to measure the internal resistance ‘r’ of a cell. Write the working formula (derivation is not required). 

Appears in 2 question papers
Chapter: [2] Current Electricity
Concept: Potentiometer

Derive Snell’s law on the basis of Huygen’s wave theory when the light is travelling from a denser to a rarer medium.

Appears in 2 question papers
Chapter: [6.01] Ray Optics and Optical Instruments
Concept: Snell’s Law

Write one balanced equation to show Nuclear fission

Appears in 2 question papers
Chapter: [8.02] Nuclei
Concept: Nuclear Energy > Nuclear Fusion – Energy Generation in Stars

What is the use of Zener diode?

Appears in 2 question papers
Chapter: [9] Electronic Devices
Concept: Semiconductor Diode

A short electric dipole (which consists of two point charges, +q and -q) is placed at the centre 0 and inside a large cube (ABCDEFGH) of length L, as shown in Figure 1. The electric flux, emanating through the cube is:

a) `q"/"4piin_9L`

b) zero

c) `q"/"2piin_0L`

d) `q"/"3piin_0L`

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Electric Dipole

What is meant by the term Quantization of charge?

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Quantisation of Charge

Derive an expression for the intensity of electric field at a point in broadside position or on [4)
an equatorial line of an electric dipole.

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Electric Dipole

 A closed surface in vacuum encloses charges –q and +3q. The total electric flux emerging out of the surface is :

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Applications of Gauss’s Law

Maximum torque acting on an electric dipole of moment  3×10-29  Cm in a uniform electric field E is 6 × 10-25 Nm. Find E.

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Dipole in a Uniform External Field

The intensity of the electric field at a perpendicular distance of 0·5 m from an infinitely long line charge having linear charge density (λ) is 3-6 × 103 Vm-1. Find the value of λ.

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Electric Field Lines

The intensity of the electric field at a point at a perpendicular distance ‘r’ from an infinite line charge, having linear charge density ‘λ’ is given by:

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Electric Field Due to a Point Charge

In Figure 1 below, a charge Q is fixed. Another charge q is moved along a circular arc MN of radius r around it, from the point M to the point N such that the length of the arc MN = l. The work done in this process is: 

figure 1

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Basic Properties of Electric Charge

A charged oil drop weighing 1.6 x 10-15 N is found to remain suspended in a uniform electric field of intensity 2 x 103 Nc-1. Find the charge on the drop. 

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Electric Field Due to a Point Charge

An electric dipole of dipole moment `vecP` is placed in a uniform electric field `vecE` with its axis inclined to the field. Write an expression for the torque `vecT` experienced by the dipole in vector form. Show diagrammatically how the dipole should be kept in the electric field so that the torque acting on it is:
(i) maximum
(ii) Zero

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Dipole in a Uniform External Field

Two-point charges Q1 = 400 μC and Q2 = 100 μC are kept fixed, 60 cm apart in a vacuum. Find the intensity of the electric field at the midpoint of the line joining Q1 and Q2.  

Appears in 1 question paper
Chapter: [1.01] Electric Charges and Fields
Concept: Electric Dipole
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