Tahsili SAAT (Saudi Arabia) · Physics

Mechanics, Waves, Thermodynamics and Electromagnetism

31 practice questions, each with the answer and an explanation.

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An object accelerates uniformly from rest at $3 m/s^{2}$ along a straight line. What distance does it cover in $4 seconds$ ?
A force of $20 N$ acts on a cart of mass $4 kg$ on a frictionless horizontal floor. What is the acceleration produced?
What is the kinetic energy of an automobile of mass $1, 000 kg$ travelling at a constant speed of $20 m/s$ ?
According to Newton's universal law of gravitation, if the distance between two point masses is tripled, how does the gravitational attractive force between them change?
A sound wave travels through air at $340 m/s$ with a frequency of $170 Hz$ . What is the wavelength of this sound wave?
A ray of light in air strikes a glass plate at an angle of incidence of $3 0^{\circ}$ . If the refractive index of the glass is $1.5$ and $sin (3 0^{\circ}) = 0.5$ , what is $sin (r)$ for the refracted ray in…
Two point charges of $+ 2 C$ and $+ 3 C$ are separated by a distance $r$ . If both charges are doubled in magnitude while the distance is kept constant, by what factor does the electrostati…
An electric circuit contains three resistors of resistances $2 Ω$ , $3 Ω$ , and $6 Ω$ connected in parallel. What is the equivalent resistance of the circuit?
A transformer has 100 turns in its primary coil and 500 turns in its secondary coil. If an alternating voltage of $120 V$ is applied across the primary, what is the output voltage across the se…
According to the first law of thermodynamics, what is the change in internal energy ( $Δ U$ ) of a thermodynamic system that absorbs $500 J$ of heat ( $Q$ ) and performs $200 J$ of work…
In the photoelectric effect, what happens to the maximum kinetic energy of emitted photoelectrons when the frequency of incident light is increased above the threshold frequency?
A radioactive isotope has a half-life of 8 days. If a sample initially contains 80 grams of the isotope, how many grams remain after 24 days?
What type of mirror always produces a virtual, upright, and diminished image of a real object regardless of object distance?
What physical property of a sound wave determines its perceived musical pitch?
A car negotiates an unbanked circular curve of radius $50 m$ . What provides the necessary centripetal force preventing the car from skidding outward?
An electric heater draws a current of $5 A$ from a $220 V$ power supply. What is the electric power consumed by the heater?
Which of the following electromagnetic waves possesses the highest frequency and photon energy in the electromagnetic spectrum?
What is the SI unit of magnetic flux density ( $B$ )?
A pendulum clock is taken from the Earth's surface to the Moon, where surface gravity is approximately $\frac{1}{6}$ that of Earth. How does the period of the pendulum change?
What conserved physical quantity explains why an ice skater spins faster when drawing their outstretched arms close to their body?
A ball is thrown vertically upward with an initial velocity of $29.4 m/s$ . Assuming $g = 9.8 m/s^{2}$ , how many seconds does it take to reach its maximum height?
What happens to the electrical resistance of an ideal metallic conductor when its temperature is increased?
In a double-slit interference experiment, what happens to the fringe separation ( $Δ y$ ) on the screen if the distance from the slits to the screen ( $L$ ) is doubled?
What is the work done by a centripetal force acting on an object moving in a uniform circle of radius $R$ over one complete revolution?
Which law states that the induced electromotive force in a closed circuit is directly proportional to the time rate of change of magnetic flux through the circuit?
What is the equivalent temperature in Kelvin of $2 7^{\circ} C$ ?
Two masses $m_{1} = 3 kg$ and $m_{2} = 2 kg$ hang vertically from the two ends of a light string passing over a frictionless, massless pulley (take $g = 9.8 m/s^{2}$ ). What is the downw…
A $12 V$ battery is connected across two resistors in parallel: $R_{1} = 6 Ω$ and $R_{2} = 12 Ω$ , which are in series with $R_{3} = 2 Ω$ . What is the total power dissipated in the c…
Light of frequency $1.2 \times 1 0^{15} Hz$ strikes a metal with a work function of $3.0 eV$ . What is the maximum kinetic energy of ejected photoelectrons? (…
A light ray travels from a transparent medium with refractive index $n = 1.50$ into air ( $n = 1.00$ ). What is the critical angle $θ_{c}$ for total internal reflection?
A train blowing a whistle of frequency $400 Hz$ approaches a stationary observer at $34 m/s$ . If speed of sound in air is $340 m/s$ , what frequency does the observer perceive?

Mechanics, Waves, Thermodynamics and Electromagnetism

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