Past Paper 2025 11th Class Karachi Board Physics Objective (Science Pre-Engineering and Pre-Medical Group)

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PHYSICS 2025

(Science Pre-Engineering & Pre-Medical Groups)

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) This property of light does not change the nature of medium: *Velocity *Amplitude *Wavelength *Frequency✓

ii) The process of superimposing signal frequency on the carrier wave is known as: *Resonance *Modulation ✓ *Damping *Diffraction

iii) The maximum value of static friction is called: *Kinetic friction *Sliding friction *Rolling friction *Limiting friction ✓

iv) The speed of sound in air at STP is m/s . If the air pressure becomes half at the same temperature, the speed of sound becomes: *332 cm/s *664cm/s *332 m/s✓ *166 m/s

v) One revolution per minute (RPM) is equal to: *2π30 rad/s *π60 rad/s *2π60 rad/s✓ *602π rad/s

vi) If a wire of uniform area of cross-section 'A', length 'L' and resistance 'R' is cut into two equal parts, the resistivity of each part: *become zero *is halved *is doubled *remains same✓

vii) If the cross-sectional area of a pipe decreases, the fluid velocity: *increases ✓ *remain the same *decreases *first increase then decrease

viii) If one joule of work is performed on a body in one second, the power will be: *One watt ✓ *One joule *One newton *One pascal

ix) The acceleration of projectile at highest point of its trajectory will be: *zero *980 m/s² *9.8 m/s² ✓ *19.8 m/s²

x) (i, j) = : *0 *1✓ *j *k

xi) LT−2 are dimensions of: *acceleration due to gravity✓ *moment of inertia *moment of force *angular momentum

xii) The dot product of force and velocity, is called: *Work *Power ✓ *Energy *Torque

xiii) 'An object completely submerged in a fluid, displaces fluid equal to its own volume', this is: *Pascal's Law *Boyle's Law *Archimedes Principle✓ *Charle's Law

xiv) 1.6 × 10−19 J = : *Charge of electron *1 Volt *1 watt *1 electron volt (eV) ✓

xv) With the presence of dielectric between plates of a parallel plate capacitor, the capacitance of the capacitor: *decreases *remains same *increases ✓ *become zero

xvi) By increasing temperature of a metallic conductor, resistance will: *decrease *increase ✓ *remain same *become zero

xvii) Oscillations in which the amplitude gradually decreases over time due to energy loss are called: *Free oscillations *Forced oscillations *Damped oscillation✓ *Resonance

SECTION 'B' (Short Questions) (22)

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