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# Federal Board Class X Physics SSC (9th & 10th

Federal Board Class X Physics

SECTION “A”

Q.1. Insert the correct option.

i. A sphere of mass 2kg is raised to a height of 10m above the ground. What is the energy stored in the sphere?

• 10 J
• 50 J
• 100 J
• 200 J

ii. Amongst the following electrical instruments which one is used to measure the potential difference between two points.

• Galvanometer
• Ohmmeter
• Ammeter
• Voltmeter

iii. What would be the equivalent capacitance of 3μ F and 6μ F capacitors when connected in series?

• 2μ F
• 4μ F
• 9μ F
• 18μ F

iv. A car covers a distance of 360 Km in 4 hours. What is speed in meters per second?

• 15 ms⁻¹
• 20 ms⁻¹
• 25 ms⁻¹
• 30 ms⁻¹

v. What is the correct relation connecting electric charge, potential difference and the work done?

• w = v/q
• vw = q
• v = q/w
• v = w/q

vi. The apparent depth of a swimming pool is 1.5m. What would be its real depth if the refractive index of water is 1.33?

• 1.5m
• 2m
• 2.5m
• 3m

vii. A lead shot of mass 10g is fired with an air gun. What is its momentum if its velocity is 60ms⁻¹?

• 0.6 kgm⁻¹
• 6 kgm⁻¹
• 60 gms⁻¹
• 600 gms⁻¹

viii. Amongst the following which quantity is measured in the unit of Nm²Kg⁻²

• Specific heat capacity
• Gravitational Constant
• Power
• Viscosity

ix. At which temperature would the surface tension of water be minimum.

• 0⁰C
• 20⁰C
• 25⁰C
• 100⁰C

x. If x and y components of the force 60 N and 35 N respectively. What angle does the resultant force make with horizontal direction?

• 30⁰
• 35⁰
• 54.7⁰
• 59.9⁰

xi. What is the range of audible frequency for human ear.

• 20Hz to 2000Hz
• 20Hz to 20KHz
• 20Hz to 20000KHz
• 2Khz to 20000Hz

xii. A 20 cm long spanner is used to open the nut of a car. How much force should be applied on the spanner if the torque required to open the nut is 150Nm?

• 30 N
• 7.5 N
• 3000 N
• 750 N

xiii. Positron is a particle with mass equal to an charge equal and opposite to

• Electron
• Proton
• Neutron
• α-particle

SECTION “B”

Q.2. Attempt all the questions.

i. A body of mass 5 kg is allowed to drop from a height of 40m. Find its velocity after 2 second.

ii. A small steel pin sink in water while a large wooden log floats on water surface. Explain why?

iii. Differentiate between constructive and destructive interference.

iv. What is the function is transformer? Name its working principle.

v. Describe, how the doping process improves the conducting properties of semi-conductors?

vi. Figure given below shows a 40kg boy sitting at position ‘A’ from the axis. How far away from the axis at position ‘B’ may a 30 kg boy sit, so that the see-saw may be in equilibrium?

DIAGRAM

vii. Explain three factors on which the loudness of sound depends.

viii. Define Lest Count. How is the least count of vernier calipers determined?

ix. Show that the gravitational force between two masses shown above is equal to the gravitational constant.

x. Differentiate between natural and artificial radioactive elements.

xi. How is the resistance of metallic conductor affected by the rise in its temperature?

xii. Define electric field intensity at a point due to charge ‘q’ and write its unit.

xiii. Calculate the deepness of a submarine from the surface if it dives 60m at angle of 45 with horizontal surface of the sea.

xiv. An object is placed 30cm from a concave mirror where will its image be formed if the radius of curvature of the mirror is 10cm? What is the nature of image?

xv. Explain the difference between analogue and digital electronics or what is meant by information technology? What sources are in use for it?

xvi. Two containers ‘A’ and ‘B’ have equal amounts of honey and water in them respectively. You want to empty them at the same time. Which container will made empty first and why?

xvii. Why is the level of the outer bank of a round track kept slightly higher than that of the inner bank?

SECTION “C”

NOTE: Attempt THREE questions. Question No. 6 is compulsory.

Q.3. (a) State and explain the law of universal gravitation.
Q.3. (b) Consider a body of mass ‘m’ placed on the surface of Earth. Derive an expression for the mass of the Earth using the above law.
Q.3. (c) Show, how the value of ‘g’ varies with the altitude.

Q.4. (a) Define vibratory motion.
Q.4. (b) Discuss the motion of a mass attached to a spring and who that its motion is SHM.
Q.4. (c) Find the time period and frequency of a body of mass 0.5 kg attached to a spring of spring constant 8Nm⁻¹ placed on the horizontal frictionless surface.

Q.6. (a) What is an inclined plane? Derive an expression for the mechanical advantage of the inclined plane.
Q.6. (b) Show that the mechanical advantage of an inclined plane is always greater than 1.
Q.6. (c) A 6m long plank is used for lifting a sack of flour having 100kg mass on a truck. If the body of the truck is 1.5m above the surface of the road then.

i. Calculate mechanical advantage of the inclined plane.
ii. What is the angle formed by the plank with the road?

a. (i) What are semi-conductors?
(ii) How are N and P-type of material made?

b. Discuss PN junction diode when it is.

Forward biased
Reversed biased

c. Draw the circuit diagram of semi-conductor diode used as a rectifier.

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