Past Paper 2025 11th Class Karachi Board Physics Objective (Science General Group)

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PHYSICS 2025

(Science General Group)

TIME: 3 Hours (85 Marks)

SECTION 'A' (Multiple Choice Questions)(17)

NOTE: i) This section consists of 17 part questions and all are to be answered. Each question carries 1 mark.

ii) Do not copy the part questions in your answer book. Write only the answer in full against the proper number of the question and its part.

iii) The use of scientific calculator is allowed. All notations are used in their usual meanings

1. Select the correct answer for each from the given options:

i) If î, ĵ and k̂ are unit vectors then (î × ĵ) is equal to: *zero *1 *ĵ *k̂✓

ii) The quantity having the same unit in different systems of unit is: *Mass *Time ✓ *Length *Temperature

iii) If the average velocity of a body is equal to the instantaneous velocity, the body is said to be moving with: *Uniform Velocity ✓ *Uniform Acceleration *Variable Velocity *Variable Acceleration

iv) This force is also called 'Self Adjusting' force: *Tension *Frictional force✓ *Weight *Thrust

v) One radian is equal to: *0.017° *35.7° *57.3° ✓ *0.117°

vi) The turning effect of a force about the axis of rotation is called: *Momentum *Inertia *Orbital velocity *Torque ✓

vii) Work done by centripetal force is: *Maximum *Negative *Zero✓ *Infinite

viii) The minimum velocity required for an object to escape earth's gravitational field is approximately: *11.2 km/s ✓ *5 km/s *15.3 km/s *9.8 km/s

ix) This is associated with law of conservation of energy in fluids: *Archimede's principle *Pascal's Principle *Bernoulli's principle ✓ *Equation of continuity

x) The flux through an area A in a uniform electric field E is maximum when the angle between E and A is: *0°✓ *30° *60° *90°

xi) The charging of a capacitor through a resistance follows: *Coulombs law *Exponential law ✓ *Power law *Inverse square law

xii) Reciprocal of resistance is called: *Resistivity *Conductance ✓ *Resonance *Capacitance

xiii) A particle is executing Simple Harmonic Motion, the particle has a maximum velocity when it is: *At maximum displacement *At equilibrium position✓ *At half the amplitude *At one quarter the amplitude

xiv) For constructive interference, the path difference between two coherent waves must be: *(m + 12) λ *1/4 λ *mλ✓ *mλ/2

xv) The process of superimposing signal frequency onto a carrier wave is called: *Modulation ✓ *Detection *Transmission *Reception

xvi) The speed of sound in air at STP is 332 m/s . If the air pressure becomes double at the same temperature, the speed of sound will be: *1382 m/s *664 m/s *332 m/s ✓ *166 m/s

xvii) The SI unit of surface tension is: *N *N/m✓ *N/m² *m/N

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