HSC Science (General)
HSC Science (Electronics)
HSC Science (Computer Science)
Academic Year: 2020-2021
Date: April 2021
Duration: 3h
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- The question paper is divided into four sections.
- Section A: Q. No. 1 contains Ten multiple-choice type of questions carrying One mark each.
- Section A: Q. No. 2 contains Eight very short answer type of questions carrying One mark each.
- Section B: Q. No. 3 to Q. No. 14 contains Twelve short answer type of questions carrying Two marks each. (Attempt any Eight).
- Section C: Q. No.15 to Q. No. 26 contains Twelve short answer type of questions carrying Three marks each. (Attempt any Eight).
- Section D: Q.No. 27 to Q. No. 31 contains Five long answer type of questions carrying Four marks each. (Attempt any Three).
- Use of log table is allowed. Use of calculator is not allowed.
- Figures to the right indicate full marks.
- For each MCQ, correct answer must be written along with its alphabet.
e.g., (a) ..... / (b ) .... / ( c ) .... / ( d) ..... Only first attempt will be considered for evaluation. - Physical constants:
a. Latent heat of vaporisation, Lvap = 2256 kJ/kg
b. Acceleration due to gravity, g = 9.8 m/s2
A diver in a swimming pool bends his head before diving. It ______
Increases his linear velocity
Decreases his angular velocity
Increases his moment of inertia
Decreases his moment of inertia
Chapter: [0.01] Rotational Dynamics
The average energy per molecule is proportional to ______
the pressure of the gas
the volume of the gas
the absolute temperature of the gas
the mass of the gas
Chapter: [0.03] Kinetic Theory of Gases and Radiation
Heating a gas in a constant volume container is an example of which process?
isochoric
adiabatic
isobaric
cyclic
Chapter: [0.04] Thermodynamics
A set of tuning forks is arranged in ascending order of frequencies each tuning fork gives 8 beats/s with the preceding one. If the frequency of the first tuning fork is 120 Hz and the last fork is 200 Hz, then the number of tuning forks arranged will be, ______
8
9
10
11
Chapter: [0.06] Superposition of Waves [0.06] Superposition of Waves
If an electron of charge (-e) and mass me revolves around the nucleus of an atom having an orbital magnetic moment m0, then the angular momentum of the electron is ______
L = `(m_0e)/(2m_e)`
L = `e/(2m_0m_e)`
L = `(2m_0m_e)/e`
L = `(2e)/(m_0m_e)`
Chapter: [0.11] Magnetic Materials
According to De-Broglie, the waves are associated with ______
moving neutral particles only.
moving charged particle only.
electrons only
all moving matter particles
Chapter: [0.14] Dual Nature of Radiation and Matter
In a Bipolar junction transistor, the largest current flows through ______
in the emitter
in the collector
in the base
through CB junction
Chapter:
The moment of inertia of a circular loop of radius R, at a distance of R/2 around a rotating axis parallel to horizontal diameter of the loop is ______
½ MR2
¾ MR2
MR2
2MR2
Chapter: [0.01] Rotational Dynamics
The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly ______.
0.9 × 10–3J
0.4 × 10–3J
0.7 × 10–3J
0.5 × 10–3J
Chapter: [0.02] Mechanical Properties of Fluids [0.06] Surface Tension
The speed of electron having de Broglie wavelength of 10 -10 m is ______
(me = 9.1 × 10-31 kg, h = 6.63 × 10-34 J-s)
7.28 × 106 m/s
4 × 106 m/s
8 × 105 m/s
5.25 × 105 m/s
Chapter: [0.15] Structure of Atoms and Nuclei
On what, the values of absorption coefficient, reflection coefficient, and transmission coefficient depend, in addition to the material of the object on which the radiation is an incident?
Chapter: [0.03] Kinetic Theory of Gases and Radiation
Above what temperature, all bodies radiate electromagnetic radiation?
Chapter: [0.03] Kinetic Theory of Gases and Radiation
What is the net weight of a body when it falls with terminal velocity through a viscous medium?
Chapter: [0.02] Mechanical Properties of Fluids
What is the energy associated with the random, disordered motion of the molecules of a system called as?
Chapter: [0.04] Thermodynamics
What is the shape of the wavefront on Earth for Sunlight?
Chapter: [0.07] Wave Optics
What is the angular momentum of an electron in the first excited state for a hydrogen atom?
Chapter: [0.15] Structure of Atoms and Nuclei
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A solenoid of length 50 cm of the inner radius of 1 cm and is made up of 500 turns of copper wire for a current of 5 A in it. What will be the magnitude of the magnetic field inside the solenoid?
Chapter: [0.1] Magnetic Fields Due to Electric Current
Derive an expression for maximum safety speed with which a vehicle should move along a curved horizontal road. State the significance of it.
Chapter: [0.01] Rotational Dynamics
For a stationary wave set up in a string having both ends fixed, what is the ratio of the fundamental frequency to the third harmonic?
Chapter: [0.06] Superposition of Waves
How the frequency of the vibrating wire is affected if the load is fully immersed in water?
Chapter: [0.06] Superposition of Waves [0.08] Stationary Waves
What are the disadvantages of a potentiometer over a voltmeter?
Chapter: [0.09] Current Electricity [0.13] Current Electricity
Distinguish between an ammeter and a voltmeter.
Chapter:
Define Magnetization.
Chapter: [0.11] Magnetic Materials [0.15] Magnetism
State formula and S.I. unit of Magnetization.
Chapter: [0.11] Magnetic Materials [0.15] Magnetism
Draw a neat labelled circuit diagram of a full-wave rectifier using a semiconductor diode.
Chapter: [0.16] Semiconductor Devices
3 mole of a gas at temperature 400 K expands isothermally from an initial volume of 4 litres to a final volume of 8 litres. Find the work done by the gas. (R = 8.31 J mol-1 K-1)
Chapter: [0.04] Thermodynamics
The acceleration due to gravity on the surface of the moon is 1.7 m/s2. What is the time period of a simple pendulum on the surface of the moon if its time period on the surface of the earth is 3.5 s? (g on the surface of earth = 9.8 m/s2)
Chapter: [0.05] Oscillations
Currents of equal magnitude pass through two long parallel wires having a separation of 1.35 cm. If the force per unit length on each of the wires is 4.76 x 10-2 N, what must be I ?
Chapter: [0.1] Magnetic Fields Due to Electric Current
If the total energy of radiation of frequency 1014 Hz is 6.63 J, Calculate the number of photons in the radiation.
Chapter: [0.14] Dual Nature of Radiation and Matter
Draw the circuit symbol for NPN and PNP transistors. What is the difference in the Emitter, Base, and Collector regions of a transistor?
Chapter: [0.16] Semiconductor Devices
State Stoke’s law and give two factors affecting angle of contact.
Chapter: [0.02] Mechanical Properties of Fluids
Obtain the expression for the period of a magnet vibrating in a uniform magnetic field and performing S.H.M.
Chapter: [0.05] Oscillations
Explain experimental setup for Fraunhofer diffraction with neat diagram.
Chapter: [0.07] Wave Optics
Explain step up and step down transformer?
Chapter: [0.12] Electromagnetic Induction [0.16] Electromagnetic Inductions
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Obtain an expression for the energy stored in a charged condenser. Express it in different forms.
Chapter:
Explain Biot Savart's Law.
Chapter: [0.1] Magnetic Fields Due to Electric Current
Explain the term capacitive reactance. State its unit and dimensions.
Chapter: [0.13] AC Circuits
A radio can tune over the frequency range of a portion of the MW broadcast band (800kHz -1200kHz). If its LC circuit has an effective inductance of 200mH, what must be the range of its variable condenser?
Chapter: [0.13] AC Circuits [0.16] Electromagnetic Inductions
In Fraunhoffer diffraction by a narrow slit, a screen is placed at a distance of 2 m from the lens to obtain the diffraction pattern. If the slit width is 0.2 mm and the first minimum is 5 mm on either side of the central maximum, find the wavelength of light.
Chapter: [0.07] Wave Optics
Two parallel plate capacitors X and Y have the same area of the plates and the same separation between them is connected in series to a battery of 15 V. X has air between the plates while Y contains a dielectric of constant k = 2.
i) Calculate the capacitance of each capacitor if the equivalent capacitance of the combination is 2 μF.
ii) Calculate the potential difference between the plates of X and Y.
iii) What is the ratio of the electrostatic energy stored in X and Y?
Chapter:
A cylinder containing one gram molecule of the gas was compressed adiabatically until its temperature rose from 27°C to 97°C. Calculate the work done and heat produced in the gas (𝛾 = 1.5).
Chapter: [0.04] Thermodynamics
A flywheel of mass 8 kg and radius 10 cm rotating with a uniform angular speed of 5 rad/sec about its axis of rotation, is subjected to an accelerating torque of 0.01 Nm for 10 seconds. Calculate the change in its angular momentum and change in its kinetic energy.
Chapter: [0.01] Rotational Dynamics
Derive Laplace’s law for spherical membrane of bubble due to surface tension.
Chapter: [0.02] Mechanical Properties of Fluids [0.06] Surface Tension
Show that half life period of radioactive material varies inversely to decay constant λ.
Chapter: [0.15] Structure of Atoms and Nuclei
Derive Mayer’s relation.
Chapter: [0.03] Kinetic Theory of Gases and Radiation
Distinguish between a potentiometer and a voltmeter.
Chapter: [0.09] Current Electricity [0.13] Current Electricity
An iron rod of the area of cross-section 0.1m2 is subjected to a magnetizing field of 1000 A/m. Calculate the magnetic permeability of the iron rod. [Magnetic susceptibility of iron = 59.9, magnetic permeability of vacuum = 4π x 10-7 S. I. unit]
Chapter: [0.11] Magnetic Materials [0.15] Magnetism
Why and where are eddy currents are undesirable? How are they minimized?
Chapter: [0.12] Electromagnetic Induction
Calculate De Broglie's wavelength of the bullet moving with speed 90m/sec and having a mass of 5 gm.
Chapter: [0.14] Dual Nature of Radiation and Matter
Obtain an expression for the self-inductance of a solenoid.
Chapter: [0.12] Electromagnetic Induction [0.16] Electromagnetic Inductions
The angular momentum of an electron in the 3rd Bohr orbit of a Hydrogen atom is 3.165 × 10-34 kg m2/s. Calculate Plank’s constant h.
Chapter: [0.15] Structure of Atoms and Nuclei
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