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## Class 10 Physics 2018

Paper preparation becomes easy for any exam if you have past papers available with you. By analyzing past papers, a student feels very much satisfied with his future exam. We have solved the Class 10 Physics 2018 Past Paper in this post.

We are quite hopeful that students of the Federal Board, BISE Lahore, BISE Rawalpindi, BISE Multan, BISE Sargodha, BISE FSD, BISE GRW, BISE Sahiwal, BISE BWP, and all the other educational boards, will take advantage of this post.

## Class 10 Physics 2018 (Local) Paper

### Section B

#### Q2.

##### (i) Write down any three common properties of Longitudinal and Transverse waves.

Ans:   The common properties of Longitudinal and Transverse waves are:
1.         Both the waves are mechanical waves.
2.         Both the waves transport energy.
3.         In both the waves, the particles oscillate about their mean positions.
4.         Both the waves satisfy the equation v=fλ

##### (iii) Explain briefly the transmission of radio waves.

Excluded from Syllabus for Annual Exams 2021

##### (iv) Define the following: a. Reverberation b. Acoustics

Excluded from Syllabus for Annual Exams 2021

##### (vii) If a high voltage power line fell across your car while you were in the car. Why should you not come out of the car?

Excluded from Syllabus for Annual Exams 2021

##### (viii) Does each capacitor carry equal charge in series combination? Explain briefly.

Excluded from Syllabus for Annual Exams 2021

##### (ix) Write down any three properties of electric field lines.

Ans.    Properties of Electric Field Lines:
1.  The field lines are imaginary lines around a field charge with an arrow head indicating the direction of the force.
2.  Field lines are always directed from positive charge towards negative charge.
3.  The spacing between the field lines shows the strength of the electric field.

##### (x) Name any three uses of oscilloscope.

Excluded from Syllabus for Annual Exams 2021

##### (xi) Name two factors, which can enhance the thermionic emission and also define thermionic emission.

Ans.    Thermionic Emission: When metals are heated, electrons are emitted from the surface of the metals. The process of emission of electrons from the surfaces of hot metals is called thermionic emission.

The rate of thermionic emission depends upon the nature of the metal, its temperature, and the surface area of the metal. Increasing the temperature and surface area of the cathode, the rate of thermionic emission is increased.

##### (xv) Can current flow in a circuit without a potential difference?

Excluded from Syllabus for Annual Exams 2021

### Section C

#### Attempt any Two Questions

##### Q3. a. Draw ray diagram of the following:                       (2+2+2)(i)         Simple Microscope(ii)        Compound Microscope (iii)       Telescope

Excluded from Syllabus for Annual Exams 2021

##### Q5. a. Define Generator, A.C Generator and also draw labeled diagram to illustrate the structure and working of A.C Generator.   (1+1+4)

Excluded from Syllabus for Annual Exams 2021

##### Q5. b. By applying a potential difference of 10 volts across the conductor, a current of 1.5A passes through it. How much energy would be obtained from the current in 2 minutes?   (4)
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