# Physics – Important Question Bank for Goa HSSC (HSC) Board Exam 2017

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After the tremendous success of our last year Important Questions Bank for Goa HSSC Board Exam 2016, we have also created a list of Most Important Questions Bank for Goa HSSC (HSC) Board Exam 2017 which are likely to appear in HSC Board Exams this year. To unlock the content Click on any of 3 buttons available in the box below saying “This content is Locked”. Once you click on the button the content will get unlocked on same page itself. You must click on social media button showing in below box ie Facebook, Twitter or Google Plus to unlock the content.

PHYSICS IMPORTANT QUESTION BANK FOR 2017:

1. An ebonite rod is rubbed with fur. Is there any transfer of mass from the fur to rod? Justify your answer.
2. What is importance of modulation index in communication system?
3. The barrier potential of a silicon p-n junction is 0.7 V. Can we measure it using voltmeter?
4. Write the function of a repeater used in communication system.
5.The electric mains in a house is rated 220V, 50Hz. write down the equation for the instantaneous voltage. What is the time taken by the voltage to change from its the maximum value to its rms value?
6. Derive the expression for the de-Brogile wavelength of an electron accelerated through a potential difference of V volts.
7. Using Einsteins photoelectric equation show how one can determine the values of (i) Planck’s constant and (ii) work function of the photo-sensitive material used.
8. Draw a plot of binding energy per nucleon (BE/A) vs mass number A for nuclei in the range  Which characteristic property of nuclear force explains the approximate constancy of BE/A in the range of mass number A, 30< A< 170?

9. Define drift velocity of free electrons in a conductor. Establish the relationship between drift velocity and the electric current.
10.State Kirchhoff’s rules for an electrical network and derive the condition of balance in a Wheatstone bridge.
11. (i)State principle of working of a moving coil galvanometer.(ii) Why do we need radical magnetic field in this device?(iii)While using galvanometer as a voltmeter a high resistance is connected in series while using a galvanometer as a n ammeter a shunt is used. Give reason
12.(i)Two straight long parallel conducting wires carry current I1 and I2 in the same direction. Deduce an expression for force per unit length between them. (ii)Use this expression to define SI unit of current. (iii)Sketch the pattern of magnetic field lines around them.
13. Using Bohr’s postulate of quantization of orbital angular momentum, show that the circumference of the orbit of electron in the ηth state of hydrogen atom is η time the de-broglie wavelength associated with it.

14.Calculate the shortest wavelength of line emitted in the balmer series of hydrogen spectrum.
15.Draw a sketch of a plane electromagnetic wave propagating in space. Also indicate the directions of the oscillating electric and magnetic fields associated with the wave. What determines the speed of propagation of electromagnetic wave?
16. How are electromagnetic waves produced by oscillating charges?
17.What is the importance of coherent sources in Young’s double slit experiment? Obtain the pression for the fringe width in terms of wave λ of light, distance from the slits to the screen D and separation between the two Slits d.

18.Explain with the help of labeled ray diagram, the working of a compound microscope. Why must both the objective and the eye piece of compound microscope have short focal lengths?
19.With the help of labeled circuit diagram, briefly explain the working of a common emitter n-p-n- transistor amplifier. define its voltage gain.
20.Draw circuit diagram of a full wave rectifier using p-n junction diodes. Explain its working and show the input and output wave forms.
21. State two differences between n-type and p-type semiconductors.
22. A specimen of pure semiconductor S is connected in series with a variable resistance R , an ammeter constant, when the semiconductor is heated? Explain

23. What is frequency range at which TV signals are transmitted and why? The height of a tv tower is 80m, Calculate the range up to which signals from the tower can be received
24. Define electrostatic potential at a point. Derive expression for the electrostatic potential energy of a pair of charges q1 and q2 kept r distance apart in free space.

25.An electric dipole consists of +1μC and -1μCcharges kept 10cm apart. If it experiences a torque of 2.5 x 10-3 N m in a uniform electric field of 5 x 104 N/C, find (i) its orientation in the field. (ii) potential energy of the dipole (iii) Work done in turning it from its initial orientation to its orientation in unstable equilibrium.

26.Define capacitance of a capacitor. Obtain expression for the equivalent capacitance of two capacitors C1 and C2 connected in parallel across a battery.
27. A  parallel plate capacitor is connected across a battery. After some time, the battery is disconnected. The plates are pulled apart at twice the initial separation and a dielectric slab of dielectric constant k=10 is kept inside the capacitor filling the entire space between its plates. How will the (i) Energy stored in the capacitor (ii) Capacitance of the capacitor (iii) Electric field between the plates be affected in these cases? justify your answer in each case

28. Distinguish between unpolarized and linearly polarized light. how is linearly polarized light produced

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