SAAT Physics Practice Flashcards

180 Practice flashcards covering SI units, kinematics, dynamics, optics, electricity, and nuclear physics based on the SAAT Physics lecture notes by Mr. Waleed Aljayousi.

Which of the following is an SI unit for a basic physical quantity?

Ampere ($A$)

All of the following are scalar quantities except which one: Time, Force, Temperature, or Volume?

Force

According to the diagram on page 2 (item 3), if an object's position-time graph remains horizontal, what is its state?

at rest

If a bicycle accelerates uniformly from rest at a rate of $4\,m/s^2$, how many seconds does it take to reach a speed of $24\,m/s$?

$6$ seconds

In a motion diagram of two objects over $4\,s$, what is the calculated difference between them in meters based on the provided graph?

$$60\,m$$

An object moves at $2\,m/s$ at an acceleration rate of $0.5\,m/s^2$. Find the distance needed for the object to stop.

$$4\,m$$

The slope of a velocity-time ($v-t$) curve is measured in which units?

$$m/s^2$$

When a ball immersed in a fluid reaches terminal velocity, what is the relationship between the holding force ($F_d$) and the gravitational force ($F_g$)?

$$F_d = F_g$$

Which statement about the centrifugal force is not true?

It's a real force

A bicycle starts from rest and moves downhill with a constant acceleration of $5\,m/s^2$. After $5\,s$, what is its speed?

$$25\,m/s$$

An object falls from a window at a height of $45\,m$ with a gravitational acceleration of $10\,m/s^2$. What is its velocity when it reaches the ground?

$$30\,m/s$$

A force of $100\,N$ acts on a body of mass $20\,kg$. What is the acceleration of the body?

$$5\,m/s^2$$

If the weight of a man is $200\,N$, which statement is NOT true regarding his mass?

His mass equals $200\,kg$

A spider cam is controlled by tension forces of four wires. In which direction will the camera move if the forces are unbalanced toward the north and east?

Northeast

For a projectile launched upwards, if points 'a' and 'c' are at the same height, what is the relationship between their velocities $v_a$ and $v_c$?

$$v_a = v_c$$

In a diagram of a box sliding on a frictionless surface, which numbered arrow typically represents the Normal force ($F_N$)?

2 (vertical and perpendicular to the surface)

A fountain throws water upwards at $30\,m/s$. What is the total time required for the water to go up and return to earth?

$$6\,s$$

A bee is at the edge of a rotating wheel $2\,m$ from the center. If the tangential velocity is $3\,m/s$, what is its centripetal acceleration?

$$4.5\,m/s^2$$

A $0.8\,kg$ object is tied to a $2\,m$ string moving in a circular path at $2\,m/s$. Find the magnitude of the tension force ($F_c$).

$$1.6\,N$$

A fan changes its angular speed from $120\,rad/s$ to $250\,rad/s$ in $5\,s$. What is its angular acceleration?

$26\,rad/s^2$ (calculated as $\frac{250-120}{5}$)

The seconds hand in a clock moves for $5\,minutes$. What is its angular displacement?

$$10\pi\,rad$$

In which case does the torque equal zero?

When the force is applied parallel to the lever arm or at the axis of rotation

If a force of $40\,N$ is applied at a distance of $1.5\,m$ from the center of rotation, what is the torque applied?

$$60\,N \cdot m$$

A box is moved $6\,m$ horizontally by a force. If $\cos(60^{\circ}) = 0.5$, and assuming a force related to the context of item 24, what is the work done?

$$30\,Joules$$

To open a door with the least amount of force, where should you pull the handle relative to the hinge?

At the point furthest from the hinge (Point A)

In a pulley system where $m_1$ moves up and $m_2$ moves down, where must the fulcrum move for balance?

Right

What is the Kinetic energy of a $2000\,kg$ car moving at $5\,m/s$?

$$25000\,J$$

The area under a Force-time ($F-t$) curve represents which physical quantity?

Impulse

Under what condition is the momentum conserved in a system?

If the system is closed and isolated

If $120\,J$ of work is done on an object moving on a horizontal path, what change occurs according to the Work-Energy theorem?

Its kinetic energy changes by $120\,J$

Calculate the power of a machine that does $70\,J$ of work in $3.5\,s$.

$$20\,Watts$$

What is the change in potential energy for Hind (weight $500\,N$) when she moves up $5\,m$?

$$2500\,J$$

If a pendulum moves from the equilibrium position to its maximum height, what happens to the potential energy?

Increases

What is the relationship between the average kinetic energy of particles and temperature?

Directly proportional (Linear graph starting from origin)

If the specific heat capacity of zinc is $388\,J/kg \cdot K$, then $97\,J$ of energy is enough to increase the temperature of how much zinc by $1\,Kelvin$?

$$0.25\,kg$$

How much energy is lost by a $0.5\,kg$ iron piece when its temperature decreases by $20\,K$ ($c = 376\,J/kg \cdot K$)?

$$3760\,J$$

What is the name of the temperature at which a substance changes from solid to liquid?

The melting point

What device is capable of continuously converting thermal energy into mechanical energy?

The heat engine

Which of the following is a primary application of thermodynamics: Refrigeration, Insulation, Freezing, or Cooking?

Refrigeration

A body with a mass of $5\,kg$ and a base area of $2\,m^2$ is placed on a surface. What is the pressure it exerts ($g = 10\,m/s^2$)?

$$25\,Pa$$

What is the unit of Pascal equivalent to in terms of Newtons and meters?

$$N/m^2$$

To which of the following is the pressure of a fluid directly proportional?

Density of the fluid

What property allows insects to stand on the surface of water?

Surface tension

What are the attractive forces that affect adjacent particles of the same substance, holding them together?

Cohesive forces

A block is submerged in water ($\rho = 1000\,kg/m^3$). What is the pressure at a depth of $5\,m$ ($g = 10\,m/s^2$)?

$$50 \times 10^3\,Pa$$

Why do paper towels absorb water when placed in a water cup?

Capillary action

An atomizer (perfume sprayer) is an application of which principle?

Bernoulli's principle

What does the slope of the line represent on a graph comparing force acting on a spring to its displacement?

Spring constant

At which points in a pendulum's swing is the instantaneous speed zero?

The highest points (A, E)

Ahmed heard an echo from a mountain $510\,m$ away after $3\,s$. What is the speed of sound in air?

$$340\,m/s$$

On a wave diagram, what does the horizontal distance 'L' between two consecutive crests represent?

Wavelength

What term refers to the number of complete oscillations in one second?

Frequency

In a standing wave diagram, what do the nodes and antinodes represent respectively?

1 node (no displacement), 2 antinode (max displacement)

What type of energy is stored in the wound-up spring of a wall clock?

elastic potential energy

In the context of resonance or pipe lengths, which length represents the fundamental wavelength in an open pipe diagram?

L1 (or specific length segment)

What is defined as a disturbance that propagates through a medium?

Wave

What is a disturbance in which the particles oscillate perpendicular to the direction of propagation?

Transverse mechanical waves

A sound wave ($f = 300\,Hz$) travels $150\,m$ in $0.5\,s$. What is its wavelength?

$$1\,m$$

If sound speed at $0^{\circ}C$ is $331\,m/s$ and increases by $0.6\,m/s$ per degree, what is the speed at $10^{\circ}C$?

$$337\,m/s$$

In a wave diagram, what is the distance between a crest and the adjacent trough (points A and B)?

$$\lambda/2$$

How is sound produced and how does it travel?

Produced by vibrations and travels by changing air pressure

On what property does the 'pitch' of a sound depend?

The frequency of the sound

What is the unit of measurement for sound level?

Decibel ($dB$)

Why might an elderly person not hear a specific conversation relative to the frequencies involved?

Because the sound frequency is greater than their hearing threshold (often limited to $8000\,Hz$ in seniors)

Which unit is used to measure Illuminance?

lux ($lx$)

Illuminance ($E$) is proportional to the luminous flux ($P$) and distance ($r$) in what way?

Directly with $P$ and inversely with $r^2$

Find the illuminance at a distance of $2\,m$ below a lamp with a luminous flux of $1600\,lm$.

$$100/̄\pi$$

What color results from the intersection of blue and red light beams?

Magenta

What is the production of light that vibrates in a single plane?

Polarization

According to the Law of Reflection, if light falls on a surface, the angle of incidence equals what?

Angle of reflection

If a light ray falls on two perpendicular mirrors at an incidence angle of $30^{\circ}$, what is the angle of reflection on the second mirror?

$$60^{\circ}$$

What types of mirrors are used on the sides of cars to provide a wide field of view?

Convex

An object is $12\,cm$ in front of a concave mirror with a radius of curvature of $24\,cm$. Where is the image located?

At Infinity

In a diagram showing light moving from a denser to a lighter medium, which number represents the critical angle?

3 (where the refracted ray is parallel to the surface)

If an object is in front of a concave mirror ($f = 2\,cm$) and an image forms at $8\,cm$, what is the object distance?

$$2.6\,cm$$

An object $10\,cm$ long forms an image $30\,cm$ long in a concave mirror. What is the magnification?

$$3$$

Where is the image formed if an object is placed exactly at the focal point of a concave mirror?

At Infinity

When light moves from air into glass and back into air, which angle relationship is correct?

$\theta_1 = \theta_2$ (Incident angle into glass equals exit angle from glass)

A $5\,cm$ tall object is $25\,cm$ from a convex mirror. If an image forms $10\,cm$ away, what is the height of the image?

$$2\,cm$$

What physical phenomenon causes a mirage?

Refraction of light

Which optical devices always form virtual images?

Plane mirror, convex mirror, and concave lens

In a double-slit experiment, if $x = 2 \times 10^{-2}\,m$, $d = 3 \times 10^{-7}\,m$, and $L = 0.01\,m$, what is the wavelength of light used?

$6 \times 10^{-7}\,m$ (or derived based on transcript values)

If the opening of the leaves of a charged electroscope increases when a rod is brought close, what does this indicate?

The electroscope and rod have the same charge

What is the process of charging an object without direct contact?

Induction

If the distance between two charges is increased by a factor of $4$, what happens to the force between them?

$1/16$ of the original force

If three charges are placed in a line and the net force on the middle charge is zero, what must be true about the outer charges?

They must have identical charges (or create balanced fields)

In an electric field diagram with charges A, B, and C, if field lines enter A and leave B and C, what are the charge types?

A is negative, B and C are positive

Calculate the electric force exerted by a $4 \times 10^{-9}\,C$ charge on a $1\,C$ test charge located $1\,m$ away ($K = 9 \times 10^9$).

$$36\,N$$

If $30\,J$ of work is done to move a charge through a potential difference of $90\,V$, what is the magnitude of the charge?

$$1/3\,C$$

Calculate the electric field ($E$) between two plates $0.02\,m$ apart with a potential difference of $22\,V$.

$$1100\,N/C$$

If two spheres with the same charge but different sizes touch, how does the charge move?

From the smaller to the larger sphere due to a potential difference

What is the geometric path of equipotential surfaces around a point charge?

Circular paths (or spherical in 3D)

Which of the following magnitude of electric charge in Coulombs is physically possible (quantized)?

$$3.2 \times 10^{-19}\,C$$

In a circuit with two capacitors, how do you compare the charges if they are in series?

$$q_1 = q_2$$

How can the capacitance of a parallel-plate capacitor be increased?

Decreasing the distance between the plates and increasing their area

A capacitor is 5\,̄̄̄\mu F. If potential difference increases by $3\,V$, how much does the charge increase?

$$15 \times 10^{-6}\,C$$

The electrical resistance of a conductor is inversely proportional to which factor?

Cross-sectional Area

Calculate the resistance when a current of $1\,A$ passes through a conductor with a voltage of $220\,V$.

220\,̄̄̄\Omega

If a voltmeter reading across a resistor is $12\,V$ and the context implies a specific resistance (e.g., 3\,̄̄̄\Omega), what is the current?

$$4\,A$$

What is the power consumed by a lamp with a current of $2\,A$ and a potential difference of $12\,V$?

$$24\,W$$