پرسیاری وزاری فیزیا 2022-2023 خولی یەکەم ، خوێندنی ئینگلیزی

A man of weight 720 N stands on a light board of length 2 m that is fixed on two supports at its extremities. If the distance between the point where the man stands and the first support is 0.5 m, what is the force exerted by the second support on the board?

$=\frac{N.S}{C.m}$……………………

Which of the following determines the wavelength of the light produced by the laser?

Ice skaters use the principle of conservation of angular momentum to produce high-speed spins, if the skaters’ moment of inertia decreased to half, by what factor does its rotational kinetic energy change?

A straight segment of wire has a length of 25 cm and carries a current of 5 A, If the wire is perpendicular to a magnetic field of 0.6 T, what is the magnitude of the magnetic force on this segment of the wire?

If the distance between two lines in diffraction grating is 2 μm Calculate the number of lines per centimeter on this diffraction grating.

A force of 12 N is applied tangentially to a disk of radius 0.2 m. if the angular acceleration of disc is 4 rad/s² what is the moment of inertia of the disk?

A …………………. measure very low current of orders (mA) or (µA)

Light of frequency of 1 x 10¹⁵ Hz illuminates a sodium surface. The ejected photoelectrons are found to have a maximum kinetic energy of 1.78 eV . Find the threshold frequency for this metal? h=6.63×10^-34J.s

Which letter on the graph is used for wave amplitude?

Which of the following equations used to measure the strength of magnetic field due to a direct current on axis of solenoid?

Which of the following summarizes Rutherford’s model of the atom?

Two tuning forks are struck the first produces a sound with a frequency of 285 Hz with a wavelength of
1.2 m and the second fork produces a sound a frequency of 570 Hz what is the wavelength of sound produced
by the second fork? (If the two sounds are in the air)

In the corresponding figure calculate the conversion ratio of the transformer, and what type of transformer is it?

A photon in a laboratory experiment has an energy of 5 eV. what is the frequency of this photon?

( h = 6.63 × 10⁻³⁴ J. s)

A pendulum bob is made with a ball filled with water. if a hole in the ball allowed water to slowly leak out which of the following is true:

A power station sends power to a city. If the transfer efficiency is 0.95 what is the power sent if power lost in conducting wires 50 Kw?

The (emitter- base) junction of transistor is ………… biased

Two waves have the same wave length and amplitude interfere constructively if the amplitude of the resultant
wave is 38 cm what is the amplitude of each wave?

Lenz’s law determines which of the following:

(An increase in the wavelength of the photon scattered by an electron relative to the wavelength of the incident photon) It’s called:

A car’s tire rotates at an initial angular speed of 21.5 rad/s. The driver accelerates, and after 6.5 s the tire’s angular speed is 28 rad/s. What is the tire’s average angular acceleration during the 6.5 s time interval?

ωc= ……………………..

The symbol ( M ) in this equation

$\epsilon_2=-M\left(\frac{\Delta I}{\Delta_t}\right)$

is called

The p-n junction is the contact between a p-type semiconductor and an n- type semiconductor, generates a (Ddepletion region) from the movement of charge carriers across the p-n junction. Which of the following is correct?

Find the magnitude of the gravitational force a 71.2 kg person would experience while standing
on the surface of planet Earth

G=6.673×10^-11(N.m²/kg²)

A simple pendulum is moving with simple harmonic motion disregarding friction and air resistance which of the following remains constant for the bob pendulum along the oscillating motion?

A generator coil has 40 turns and an area of 0.3 m² is rotating in uniform magnetic field of strength 0.029 T. The loop’s axis of rotation is perpendicular to a uniform magnetic field, the maximum emf induced is 120 V, what is the frequency?

Which of the following is likely to be able to move and conduct electricity?

How many (rad) are equal (35^o):

Which of the following is true for (audible waves, Infrasonic waves and Ultrasonic waves) in the same medium?

A generator with a maximum output emf of 205 V is connected to 115 Ω resistor. Calculate the rms current
through the resistor.

The angle between direction of centripetal force (𝐹_𝑐) and direction of tangential speed (𝑣_𝑡) is:

A Formula One ” race car’s ” moves with respect to observer if the observer hears the sound of its engine with a 20% reduction of its original frequency, which of the following is correct?

AC circuit made up of resistor, a self-inductor, and capacitor all are connected in series, what is the angle of phase difference between current and total potential difference if the circuit to resonates?

(Car moves in a circular at a constant speed) which of the following is true of motion of the car?

Which figure indicate that the speed of the plane attains the speed of sound?

A 0.75 kg mass attached to a vertical spring stretches the spring 0.3 m What is the spring constant?

(A car moving around a flat circular track). Identify the force that maintains the circular motion?

If the longest wavelength of standing wave of pipe open at both ends is 4.5 m what will be the longest wavelength of that pipe when one end is closed?

Which of the following is not a component of a DC electric generator?

The three forces acting on the rod have equal magnitudes (𝐹1 = 𝐹2 = 𝐹3 = 10 N) as shown in figure which of the forces produce greatest torque on the rod about the axis at the left end of the rod ? [If 𝐿 = 1 𝑚 ]

A baseball coach shouts loudly at an umpire standing 5 m away. if the sound power produced by the coach is
π × 10^-3 W, what is the decibel level of the sound when it reaches the umpire?

A coil of self-inductance L = 50 mH is traversed by a current of intensity 2A under a direct potential difference of 20 V. what is the self impedance (X_L) of coil?

(Two sold spheres of different diameters and different masses) have the same moment of inertia, If the diameter of second sphere is half of diameter of first sphere and the mass of second sphere is ………… the mass of first sphere

Suppose that 𝑞1, 𝑞2, 𝑞3, 𝑞4 four charges, each is moving in a circular path in a magnetic field, as in the figures which of them is positive charges?

Light falls on two slits spaced 0.33 mm apart. If the angle between the first dark fringe and the central maximum is 0.055° what is the wavelength of the light?

A solid ball starts from rest at the top of an incline 3.5 m in height. Find the translational speed of the ball after it
has rolled to the bottom of the incline.

An electric current travers a one loop circular coil of diameter 50 cm. Calculate the intensity of the current if the magnitude of the magnetic field at the center of the coil is 4π×10⁻⁵T [µₒ=4π × 10^-7 T.m/A]

If a double- slit experiment were performed under-water how would the observed interference (light) pattern be affected? Why?