Class 10 Physics 2019


While preparing for any exam, past papers always play a very important role. By studying past papers, a student feels comfortable about his forthcoming exam. We have solved the Class 10 Physics 2019 Past Paper in this post.

We are quite hopeful that students of Federal Board, Lahore Board (BISE Lahore), Rawalpindi Board (BISE Rawalpindi), Multan Board (BISE Multan), Sargodha Board (BISE Sargodha), Faisalabad Board (BISE FSD), Gujranwala Board (BISE GRW), Sahiwal Board (BISE Sahiwal), Bahawalpur Board (BISE BWP) and all the other boards, will get the benefit of this post.


Class 10 Physics 2019 (Local) Paper

Section A

Q1. MCQs


Q2.

(i) Distinguish between longitudinal and transverse waves with suitable examples.

(ii) What is the difference between loudness and intensity of sound? Derive a relationship between these two.

(iii) What is meant by the principle focus of (A) convex lens (B) a concave lens? Illustrate your answer with ray diagrams.

(iv) Show that potential difference can be described as energy transferred per unit charge between the two points.

(v) Explain the energy dissipation in resistance. What is Joule’s law?

(vi) State and explain the rule by which the direction of the lines of force of the magnetic field around a current-carrying conductor can be determined.

Ans:   The required rule is stated below:
            Grasp a wire with your right hand such that your thumb is pointed in the direction of current. Then curling fingers of your hand will point in the direction of the magnetic field.”

Explanation:  The above rule is used to find the direction of magnetic field around a current-carrying conductor. But we should know the direction of current in the conductor.


(vii) Write down some benefits of using digital electronics over analogue electronics.

Ans.    Digital devices have the following benefits over analog devices:

  • Digital devices are more reliable, flexible, and portable as compared to analogue devices.
  • Digital signals are easier to transmit and are more secure than analogue signals.
  • Digital circuits are less affected by noise.
  • Digital systems interface well with computers and are easy to control with software.
  • Information storage in digital form is easy.   

(viii) Name different information storage devices and describe their uses.

Excluded from Syllabus


(ix) Write Alpha decay process for Pa. Identify the parent and daughter nuclei in this decay.
Class-10-Physics-2019L-Q2-ix

(x) Find the time period (Te and Tm) of a pendulum of 1 m length, placed on earth and moon.
Class-10-Physics-2019L-Q2-x

(xi) What are units of loudness? Why do we use a logarithmic scale to describe the range of the sound intensities we hear?

Ans:   The unit of loudness is bel, it is a very large unit of the intensity level of a sound. Generally, a smaller unit called decibel is used. Decibel is abbreviated as (dB) and 1 bel is equal to 10 dB.

We use a logarithmic scale to describe the range of the sound intensities because the range is so wide.


(xii) When an object is placed beyond 2F in front of a converging lens, then at what position its image is formed? Whether the image is real and inverted or virtual and erect, magnified or diminished. Draw a ray diagram to show its image formation.

(xiii) An electric field rod attracts pieces of paper. After a while these pieces fly away. Why?

Ans:   Initially due to electrostatic induction the pieces of paper get charged and attracted by the electric field rod but after some time the temporarily charged pieces of paper get neutralized due to which these pieces fly away.


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

(xv) Demonstrate by an experiment that a magnetic field is produced around a straight current-carrying conductor.

Ans.    Take a straight conductor wire and pass it vertically through a cardboard. Now connect the two ends of the conductor wire with the terminals of the battery so that current flows through the circuit in the clockwise direction. The lines of force of the magnetic field produced around the wire would be in the form of concentric circles. If we place a compass needle at different points in the region of magnetic field, it will align along the direction of magnetic field. Also if we sprinkle some iron filings on the cardboard around the wire, they will align themselves in concentric circles in the clockwise direction.


Section C

Attempt any Two Questions


Q3. a. Explain defects of vision and their correction both with diagrams. (3+3)

Q3. b. What do you know about transmission of light signals through optical fibers? Explain it with a diagram. (3+1)

Out of Syllabus for Annual Exam 2021


Q4. a. Explain combination of capacitors in series and in parallel with diagrams. Also, find an expression for their equivalent capacitance. (3+3)

Q4. b. A mass of 50 g is attached with one end of a spring of spring constant 10 Nm-1, whose other end is tied with a wall. Find the period and frequency of its oscillations. (2+2)

Q5. a. Explain the Half-life of a radioactive element with graph and decay equation. Also, clarify the terms parent element and daughter element. (6)

Q5. b. What do you know about the NAND gate and NOR gate? Draw their circuit diagrams, symbols, and truth tables. Give a Boolean equation for each. (2+2)

Class 10 Physics 2019 (Overseas) Paper


Section A


Q1. MCQs


Section B

Q2.


(i) Derive a relationship between speed, frequency and wavelength of a wave. Write a formula for speed of a wave to its time period and wavelength.

(ii) If the pitch of the sound is increased, what are the changes in the following?
a)         Frequency
b)         Wavelength
c)         The amplitude of the wave
                                  

(iii) With the help of a ray diagram, how can you show the use of a thin converging lens as a magnifying glass?

(iv) With the help of an electroscope how can you find the presence of charge on a body?

Out of Syllabus for Annual Exam 2021


(v) Define kilo Watt hour (kWh) and prove that 1kWh = 3.6 MJ

(vi) What are the factors which affect the magnitude of the emf induced in a circuit by a changing magnetic field?

Ans.    The magnitude of induced e.m.f. in a circuit depends on the following factors:
1. Speed of relative motion of the coil and the magnet
2. Number of turns of the coil


(vii) What are the three universal Logic Gates? Give their symbols and truth tables.

(viii) What are the components of information technology? Clearly indicate a function of any three components.

Out of Syllabus for Annual Exam 2021


(ix) Complete the given nuclear reaction; does this reaction involve fission of fusion? Justify your answer.

(x) The time period of a simple Pendulum is 2s. What will be its length on earth le? What will be its length on the moon lm  if gm=ge/6    (Take ge=10ms-2 )

(xi) If at Anarkali Bazar Lahore, the sound level is 80 dB, what will be the intensity level of sound there?

(xii) When an object is placed between F and 2F in front of a converging lens, then at what position the image is formed? Whether the image is real and inverted or virtual and erect, magnified or diminished. Draw a ray diagram to show its image formation.

(xiii) How does electrostatic induction differ from charging by friction?

Ans.    In electrostatic induction a neutral object is charged with the help of a charged object whereas in charging by friction both the objects being charged are neutral.

            In electrostatic induction object being charged always acquires an opposite charge whereas in charging by friction, both objects acquire the same or different charges depending upon the materials of the objects. 


(xiv) A current of 3 mA flowing through a wire for 1 minute. What is the charge flowing through the wire?

Q3. b. Water waves in a shallow dish are 6.0 cm long. At one point, the water moves up and down at a rate of 4.8 oscillations per second.                  (2+2)
i)  What is the speed of the water waves?
ii) What is the period of the water waves?

Q4. a. Explain a simple microscope with a neat and clean diagram. Also, give details of its magnifying power and resolving power.         (3+2+1)

Q4. b. A power station generates 500MW of electrical power which is fed to a transmission line. What current would flow in the transmission line if the input voltage is 250kV?   (4)

Q5. a. Explain nuclear fission with diagram and nuclear equation. What is a nuclear fission chain reaction and for what purpose its controlled and uncontrolled types are used.   (6)

Q5. b. Explain the working of a cathode ray oscilloscope (CRO). What is a function of an electron gun, deflecting plates, and fluorescent screen in it? (2+2)

Out of Syllabus for Annual Exam 2021

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