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Physics Set 1 2018-2019 HSC Science (Computer Science) 12th Board Exam Question Paper Solution

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Physics
Set 1
2018-2019 February
Marks: 80

[1]1

When a sparingly soluble substance like alcohol is dissolved in water, surface tension of water

increases 

 decreases 

remains constant 

becomes infinite

Chapter: [6] Surface Tension
Concept: Surface Tension
[1]2

The specific heat capacity of water is 

 8R 

`7/8R`

9R

`9/7R`

Chapter: [9] Kinetic Theory of Gases and Radiation
Concept: Specific Heat Capacities - Gases
[1]3

The electric field intensity outside the charged conducting sphere of radius ‘R’, placed in a medium of permittivity ∈ at a distance ‘r’ from the centre of the sphere in terms of surface charge density σ is

`σ/∈ (R/r)^2`

`σ/∈ (r/R)^2`

`σ/∈ (R^2/r^2)^2`

`σ/∈ (r^2/R^2)^2`

Chapter: [12] Electrostatics
Concept: Applications of Gauss’s Law
[1]4

An electron of energy 150 eV has wavelength of `10 ^-10m`. The wavelength of a 0.60 keV electron is

Chapter: [18] Atoms, Molecules and Nuclei
Concept: de-Broglie Relation
[1]5

What is the value of tangential acceleration in U.C.M. ?

Chapter: [1] Circular Motion
Concept: Angular Acceleration
[1]6

What happens to a ferromagnetic substance heated above Curie temperature ?

Chapter: [15] Magnetism
Concept: Curie Temperature
[1]7

At which position of the plane of the rotating coil with the direction of magnetic field, the e.m.f. induced in the coil is maximum ?

Chapter: [12] Electrostatics
Concept: Van-deGraaff Generator
[1]8

Name the logic gate which generated high output when at least one input is high.

Chapter: [19] Semiconductors
Concept: Digital Electronics and Logic Gates
[2]9

In Young’s experiment interference bands were produced on a screen placed at 150 cm from two slits, 0.15 mm apart and illuminated by the light of wavelength 6500 Å. Calculate the fringe width.

Chapter: [11] Interference and Diffraction
Concept: Interference of Light Waves and Young’S Experiment
[2]10

The susceptibility of magnesium at 300 K is 1.2 x 10 -5 . What will be its susceptibility at 200 K.

Chapter: [15] Magnetism
Concept: Curie Temperature
[2]11

The length of the second’s pendulum in a clock is increased to 4 times its initial length. Calculate the number of oscillations completed by the new pendulum in one minute.

Chapter: [4] Oscillations
Concept: Periodic and Oscillatory Motions
[2]12

Define capacitance of a capacitor and its SI unit.

Chapter: [12] Electrostatics
Concept: The Parallel Plate Capacitor
[2]13

Define radius of gyration. Write its physical significance.

Chapter: [3] Angular Momentum
Concept: Definition of M.I., K.E. of Rotating Body
[2]14

Distinguish between p-type and n-type semiconductors.

Chapter: [19] Semiconductors
Concept: Electrical Properties - Applications of N-type and P-type Semiconductors
[2]15

Explain the terms (a) Transducer and (b) Attenuation in communication system.

Chapter: [20] Communication Systems
Concept: Elements of a Communication System
[3]16

Obtain expressions of energy of a particle at different positions in the vertical circular motion .

Chapter: [1] Circular Motion
Concept: Vertical Circular Motion Due to Earth’s Gravitation
[3]17

Define binding energy and obtain an expression for binding energy of a satellite revolving in a circular orbit round the earth.

Chapter: [2] Gravitation
Concept: Binding Energy and Escape Velocity of a Satellite
[3]18

State Hooke’s law. Define elastic limit and modulus of elasticity.

Chapter: [5] Elasticity
Concept: Hooke’s Law
[3]19

Obtain an expression for the rise of a liquid in a capillary tube.

Chapter: [6] Surface Tension
Concept: Capillarity and Capillary Action
[3]20

Explain the reflection of transverse and longitudinal waves from a denser medium and a rared medium.

Chapter: [7] Wave Motion
Concept: Reflection of Transverse and Longitudinal Waves
[3]21

What is photoelectri effect ? Defin (i) Stopping potential (ii) Photoelectric work function. 

Chapter: [17] Electrons and Photons
Concept: Photoelectric Effect - Hertz’S Observations
[3]22

What is perfectly black body ? Explain Ferry’s black body.

Chapter: [9] Kinetic Theory of Gases and Radiation
Concept: Qualitative Ideas of Blackbody Radiation
[3]23

When a resistor of 5Ω is connected across the cell, its terminal potential difference is balanced by 150 cm of potentiometer wire and when a resistance of 10 Ω is connected across the cell, the terminal potential
difference is balanced by 175 cm same potentiometer wire. Find the balancing length when the cell is in open circuit and the internal resistance of the cell.

Chapter: [13] Current Electricity
Concept: Potentiometer
[3]24

A cyclotron is used to accelerate protons to a kinetic energy of 5 MeV. If the strength of magnetic field in the cyclotron is 2T, find the radius and the frequency needed for the applied alternating voltage of the cyclotron. (Given : Velocity of proton= `3xx10^7 m//s`)

Chapter: [14] Magnetic Effects of Electric Current
Concept: Motion in Combined Electric and Magnetic Fields - Cyclotron
[3]25

Assuming expression for impedance in a parallel resonant circuit, state the conditions for parallel resonance. Define resonant frequency and obtain an expression for it.

Chapter: [8] Stationary Waves
Concept: Forced Oscillations and Resonance
[3]26 | ATTEMPT ANY ONE
[3]26.1

Using an expression for energy of electron, obtain the Bohr’s formula for hydrogen spectral lines.

Chapter: [18] Atoms, Molecules and Nuclei
Concept: Hydrogen Spectrum
[3]26.2

State the law of radioactive decay. hence derive the relation t N = Noe-λt . Represent it graphically. `l`

Chapter: [18] Atoms, Molecules and Nuclei
Concept: Radioactivity - Introduction of Radioactivity
[5]27 | ATTEMPT ANY ONE
[5]27.1
[3]27.1.1

Show that even as well as odd harmonics are present as overtones in the case of an air column vibrating in a pipe open at both the ends.

Chapter: [8] Stationary Waves
Concept: Study of Vibrations of Air Columns
[2]27.1.2

A wheel of moment of inertia 1 kg.m2 is rotating at a speed of 30 rad/s. Due to friction on the axis, it comes to rest in 10 minutes. Calculate the average torque of the friction. 

Chapter: [8] Stationary Waves
Concept: Study of Vibrations of Air Columns
[5]27.2
[3]27.2.1

Explain the formation of stationary waves by analytical method. Show that nodes and antinodes are equally spaced in stationary waves.

Chapter: [8] Stationary Waves
Concept: Formation of Stationary Waves on String
[2]27.2.2

The radius of gyration of a body about an axis, at a distance of 0.4 m from its centre of mass is 0.5 m. Find its radius of gyration about a parallel axis passing through its centre of mass.

Chapter: [3] Angular Momentum
Concept: Definition of M.I., K.E. of Rotating Body
[5]28 | Attempt any one of the following
[5]28.1
[3]28.1.1

Obtan an expression for potential energy of a particle performing S.H.M. What is the value of potential energy at (i) Mean position, and (ii) Extreme position

Chapter: [4] Oscillations
Concept: K.E.(Kinetic Energy) and P.E.(Potential Energy) in S.H.M.
[2]28.1.2

A stretched sonometer wire is in unison with a tuning fork. When the length of the wire is increased by 5%, the number of beats heard per second is 10. Find the frequency of the tuning fork

Chapter: [8] Stationary Waves
Concept: Study of Vibrations in a Finite Medium
[5]28.2
[3]28.2.1

From differential equation of linear S.H.M., obtain an expression for acceleration, velocity and displacement of a particle performing S.H.M.

Chapter: [4] Oscillations
Concept: Differential Equation of Linear S.H.M.
[2]28.2.2

A sonometer wire 1 metre long weighing 2 g is in resonance with a tuning fork of frequency 300 Hz. Find tension in the sonometer wire.

Chapter: [8] Stationary Waves
Concept: Study of Vibrations in a Finite Medium
[5]29 | Attempt any one of the following
[5]29.1
[3]29.1.1

Explain refraction of light on the basis of wave theory. Hence prove the laws of refraction

Chapter: [10] Wave Theory of Light
Concept: Reflection and Refraction of Plane Wave at a Plane Surface Using Wave Fronts
[2]29.1.2

Two coherent sources of light having intensity ratio 81 : 1 produce interference fringes. Calculate the ratio of intensities at the maxima and minima in the interference pattern.

Chapter: [11] Interference and Diffraction
Concept: Interference of Light Waves and Young’S Experiment
[5]29.2
[3]29.2.1

State Brewster’s law and show that when light is incident at polarizing angle the reflected and refracted rays are mutually perpendicular to each other.

Chapter: [10] Wave Theory of Light
Concept: Brewster's Law
[2]29.2.2

Monochromatic light of wavelength 4300 Å falls on a slit of width ‘a’. For what value of ‘a’ the first maximum falls at 30° ?

Chapter: [11] Interference and Diffraction
Concept: Fraunhofer Diffraction Due to a Single Slit

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