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🇵🇰 BDS Admission Test · flashcards
BDS Admission Test Physics Flashcards
50 question-and-answer cards covering Physics as it is examined in BDS Admission Test. 24 of them are printed below, taken from across the deck — no signup, no paywall on the preview.
24 sample cards from the Physics deck
Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.
Define the scalar (dot) product of two vectors.
A·B = AB cos θ, where θ is the angle between them; it yields a scalar and equals the product of one vector's magnitude and the component of the other along it.
Define the vector (cross) product of two vectors.
A×B = AB sin θ n̂, where θ is the angle between them and n̂ is a unit vector perpendicular to both, given by the right-hand rule; it yields a vector.
What is the dot product of two perpendicular vectors and two parallel vectors?
Perpendicular vectors: A·B = 0 (cos 90° = 0); parallel vectors: A·B = AB (cos 0° = 1).
What is the cross product of two parallel vectors and two perpendicular vectors?
Parallel vectors: A×B = 0 (sin 0° = 0); perpendicular vectors: |A×B| = AB (sin 90° = 1).
Is the dot product commutative? Is the cross product commutative?
The dot product is commutative (A·B = B·A); the cross product is anti-commutative (A×B = −B×A).
State Newton's first law of motion.
A body remains at rest or continues in uniform motion in a straight line unless acted upon by a net external force (the law of inertia).
State Newton's second law of motion.
The rate of change of momentum of a body is proportional to the net applied force and occurs in the direction of that force; F = ma (or F = dp/dt).
State Newton's third law of motion.
For every action there is an equal and opposite reaction; the forces two bodies exert on each other are equal in magnitude and opposite in direction.
Define linear momentum and give its SI unit.
Linear momentum p = mv (mass × velocity); it is a vector quantity with SI unit kg·m/s (or N·s).
Define impulse and state its relationship to momentum.
Impulse = force × time = FΔt; by the impulse-momentum theorem, impulse equals the change in momentum: FΔt = Δp = mv − mu. SI unit: N·s.
State the law of conservation of linear momentum.
If no net external force acts on a system, its total linear momentum remains constant; in any interaction (e.g. collision) total momentum before equals total momentum after.
What is the difference between an elastic and an inelastic collision?
In an elastic collision both momentum and kinetic energy are conserved; in an inelastic collision momentum is conserved but kinetic energy is not (some converts to heat/sound/deformation).
What is projectile motion?
Projectile motion is two-dimensional motion under constant gravitational acceleration, with constant horizontal velocity and uniformly accelerated vertical motion, tracing a parabolic path.
For a projectile launched at speed v₀ and angle θ, what are the initial horizontal and vertical velocity components?
Horizontal: vₓ = v₀ cos θ (constant); Vertical: vᵧ = v₀ sin θ (changes due to gravity).
What is the formula for the time of flight of a projectile launched from ground level at angle θ?
T = (2 v₀ sin θ) / g.
What is the formula for the maximum height of a projectile?
H = (v₀² sin²θ) / (2g).
What is the formula for the horizontal range of a projectile, and at what angle is it maximum?
R = (v₀² sin 2θ) / g; the range is maximum at θ = 45° (since sin 2θ = 1).
Why is the horizontal velocity of a projectile constant while the vertical velocity changes?
Because gravity acts only vertically (downward); there is no horizontal force (neglecting air resistance), so horizontal velocity stays constant while vertical velocity changes at g.
Define work in physics and give its formula for a constant force.
Work is done when a force moves its point of application through a displacement; W = F·d cos θ, where θ is the angle between force and displacement. SI unit: joule (J).
When is work done by a force zero?
Work is zero when the displacement is zero, when the force is zero, or when the force is perpendicular to the displacement (θ = 90°, cos 90° = 0).
State the work-energy theorem.
The net work done on a body equals the change in its kinetic energy: W_net = ΔKE = ½mv² − ½mu².
Write the formulas for kinetic energy and gravitational potential energy.
Kinetic energy: KE = ½mv²; Gravitational potential energy: PE = mgh.
State the law of conservation of energy.
Energy can neither be created nor destroyed, only transformed from one form to another; the total energy of an isolated system remains constant.
Define power, give its formula, and state its SI unit.
Power is the rate of doing work or transferring energy: P = W/t = F·v; SI unit is the watt (W), where 1 W = 1 J/s.
What this deck covers
The Physics deck follows the BDS Admission Test Physics syllabus — 12 chapters and 36 topics — so questions land on material that is genuinely examinable rather than trivia around it. That works out to roughly 4.2 cards per chapter.
Answers are written to be recallable, not just readable — averaging about 121 characters, which is long enough to carry the reasoning and short enough to say out loud.
A deck like this earns its keep on the second and third pass. Read the syllabus first so you know the shape of the subject, then use the cards to find the specific facts that have not stuck.
Physics flashcards FAQ
How many Physics flashcards are in this BDS Admission Test deck?
50 cards. This page previews 24 of them, sampled evenly across the deck so you can judge the difficulty before installing anything.
Are these BDS Admission Test flashcards free?
Yes. The preview here is free to read with no signup, and the full 50-card deck is free inside the Examius app.
What do the Physics cards cover?
They follow the BDS Admission Test Physics syllabus — 12 chapters and 36 topics — so the questions track what is actually examinable.
How should I use these flashcards?
Read the syllabus first so you know the shape of the subject, then drill the deck. Examius schedules each card with spaced repetition, so cards you keep missing come back sooner and ones you know drift further apart.