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Physics Delhi set 1 2006-2007 CBSE (Science) Class 12 Question Paper Solution

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Physics
Delhi set 1
2006-2007 March
Marks: 70

[1]1

An electron, an alpha particle and a proton have the same kinetic energy.

Which one of these particles has the largest de-Broglie wavelength? 

Concept: de-Broglie Relation
Chapter: [7.01] Dual Nature of Radiation and Matter
[1]2

Why should the material used for making permanent magnets have high coercivity?

Concept: Permanent Magnets and Electromagnets
Chapter: [3.01] Magnetism and Matter
[1]3

The radioactive isotope D decays according to the sequence

If the mass number and atomic number of D2 are 176 and 71 respectively, what is (i) the mass number (ii) atomic number of D?

Concept: Radioactivity - Law of Radioactive Decay
Chapter: [8.01] Nuclei
[1]4

What will be the values of input A and B for the Boolean expression `overline ((A +B) .(A*B)) =1?`

Concept: Digital Electronics and Logic Gates
Chapter: [9.01] Semiconductor Electronics - Materials, Devices and Simple Circuits
[1]5

Why is frequency modulation preferred over amplitude modulation for transmission of music?

Concept: Amplitude Modulation
Chapter: [10.01] Communication Systems
[1]6

The output of an OR gate is connected to both the inputs of a NAND gate Draw the logic circuit of this combinaion of getes and write its truth table.

Concept: Digital Electronics and Logic Gates
Chapter: [9.01] Semiconductor Electronics - Materials, Devices and Simple Circuits
[1]7

Draw a plot of potential energy of a pair of nucleons as a function of their separation.

what is the significance of negative potential energy in the graph drawn?

Concept: Conductors and Insulators Related to Electric Field
Chapter: [1.01] Electrostatic Potential and Capacitance
[1]8

A convex lens of refractive index 1.5 has a focal length of 18 cm in air .Calculate the change in its focal length when it is immersed in water of refractive index `4/3`.

Concept: Lenses
Chapter: [6.01] Ray Optics and Optical Instruments
[2]9

The output of an OR gate is connected to both the inputs of a NAND gate Draw the logic circuit of this combinaion of getes and write its truth table.

Concept: Digital Electronics and Logic Gates
Chapter: [9.01] Semiconductor Electronics - Materials, Devices and Simple Circuits
[2]10

Draw a plot of potential energy of a pair of nucleons as a function of their separation.

what is the significance of negative potential energy in the graph drawn?

Concept: Conductors and Insulators Related to Electric Field
Chapter: [1.01] Electrostatic Potential and Capacitance
[2]11

A convex lens of refractive index 1.5 has a focal length of 18 cm in air .Calculate the change in its focal length when it is immersed in water of refractive index `4/3`.

Concept: Lenses
Chapter: [6.01] Ray Optics and Optical Instruments

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