# پرسیاری وزاری فیزیا 2023-2024 خولی یەکەم ، خوێندنی ئینگلیزی

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- Question 1 of 50
##### 1. Question

A potter’s wheel, that has the shape of a disk of radius 0.5 m

and mass 80 kg is freely rotating at 4 rad/s.

The potter can stop the wheel in

**5 s**by pressing a wet rag against the rim, how much torque

does the potter apply to

the wheel $\left(I=\frac12mr^2\right)$CorrectIncorrect - Question 2 of 50
##### 2. Question

Which of the following correctly describe the direction of

magnetic field around straight wire when a direct current

pass through itCorrectIncorrect - Question 3 of 50
##### 3. Question

Find the angular acceleration of a ball swung at a constant

angular speed of

**5 rad/s**on a rope that is**0.5 m**longCorrectIncorrect - Question 4 of 50
##### 4. Question

A disk of mass

**0.5 kg**and radius**0.1 m**rolls without slipping on an inclined plane.What is the total kinetic energy of the disk at the instant

when the instantaneous speed of its center is

**2 m/s**:CorrectIncorrect - Question 5 of 50
##### 5. Question

We want to use an ammeter of internal resistance

**5 Ω**in order to measure electric currents of intensities up to

**10A,**while the ammeter measures currents between (

**0 and 1 A)**What is the resistance of the shunt that should be

connected in parallel with the ammeter in order to do this jobCorrectIncorrect - Question 6 of 50
##### 6. Question

The arm of a crane at a construction site is

**12 m**long,and it makes an angle of

**60°**with the horizontal. Assume

that the maximum load the crane can handle is limited bythe amount of torque the load produces around the base of the arm.

What is the magnitude of the maximum torque

the crane can withstand if the maximum load the crane

can handle is**300 N**CorrectIncorrect - Question 7 of 50
##### 7. Question

A mass is attached to a spring and moves with

simple harmonic motion on a frictionless horizontal surface.

Which of the following is zero at maximum displacement

CorrectIncorrect - Question 8 of 50
##### 8. Question

. A wire

**36 m**long carries a current of**22 A**from east to west.If the magnetic force on the wire due to earth’s

magnetic field downward**(toward Earth)**and has a magnetic of**4×10**,^{-2}Nfind the magnitude of magnetic field at this location

CorrectIncorrect - Question 9 of 50
##### 9. Question

A wave whose particles vibrate perpendicular to the direction the wave is traveling, called

CorrectIncorrect - Question 10 of 50
##### 10. Question

A pendulum bob hangs from a string and moves with

simple harmonic motion. Which of the following

does not affect the period of the pendulum

CorrectIncorrect - Question 11 of 50
##### 11. Question

A single circular loop with a radius of

**22 cm**is placed in a uniform external magnetic field with a strength of

**0.5 T**so

that the plane of the coil is perpendicular to the fieldThe coil is pulled steadily out of the field in

**0.25 s**.Find the average induced (

**𝜀**) during this intervalCorrectIncorrect - Question 12 of 50
##### 12. Question

If a sound seems to be getting louder, which of the following is probably increasing

CorrectIncorrect - Question 13 of 50
##### 13. Question

A bar magnet is positioned near a coil of wire, as shown in figure. What is the

direction of the current in the resistor R when the magnet is moved to the left:CorrectIncorrect - Question 14 of 50
##### 14. Question

The tendency of a body rotating about a fixed axis to resist a change in rotational motion

CorrectIncorrect - Question 15 of 50
##### 15. Question

. In the figure Wire 1 carries current I

_{1}and creates magnetic field B_{1}, Wire 2 carries current I2

and creates magnetic field B_{2}. What is the direction of the magnetic force acting on wire 1

as a result of B_{2}CorrectIncorrect - Question 16 of 50
##### 16. Question

Lawand dips his finger into a pan of water twice each second,

producing waves if the distance between two

successive crests is**0.15 m**. Determine the speed of these water waves

CorrectIncorrect - Question 17 of 50
##### 17. Question

Machine that converts electrical energy to mechanical energy

CorrectIncorrect - Question 18 of 50
##### 18. Question

The (

**Maser**) device works In the region of which of the following wavesCorrectIncorrect - Question 19 of 50
##### 19. Question

How many revolutions (

**rev**) equal**270**°CorrectIncorrect - Question 20 of 50
##### 20. Question

If the wavelength of standing wave on a string is

**90 cm**What is the distance between two adjacent nodes on that

stringCorrectIncorrect - Question 21 of 50
##### 21. Question

Ohm (Ω) equals to

CorrectIncorrect - Question 22 of 50
##### 22. Question

Which of the following represents

**Hook’s law**CorrectIncorrect - Question 23 of 50
##### 23. Question

A remote-controlled car’s wheel accelerates at

**22.4 rad/s2**

. If the wheel begins with an angular speed of**10.8 rad/s,**

what is the wheel’s angular speed after exactly three full turnsCorrectIncorrect - Question 24 of 50
##### 24. Question

A wave with an amplitude of

**0.75 m**has the same wave length as a second wavewith an amplitude of

**0.53 m**. The two waves interfere.What is the amplitude of the resultant wave if the interference is constructive

CorrectIncorrect - Question 25 of 50
##### 25. Question

What is the coefficient of self-induction of a pure self-inductor In the

circuit shown in the adjacent figure, If the angle of phase difference between

the electric current and the total potential difference is zeroCorrectIncorrect - Question 26 of 50
##### 26. Question

A wire conducting (a , b) moves at a constant speed (𝑣⃑) in a magnetic

field (𝐵⃗⃑)as shown in the figure, which of the following is correct?CorrectIncorrect - Question 27 of 50
##### 27. Question

A bicyclist rides along a circular track.

If the bicyclist travels around exactly

half the track in

**20 s**, what is his average angular speedCorrectIncorrect - Question 28 of 50
##### 28. Question

How many nodes and antinodes are in the fifth harmonic

(

**𝑓5**) in pipe closed at one endCorrectIncorrect - Question 29 of 50
##### 29. Question

. A generator coil has 150 turns and a cross-sectional area of

**0.35 m2**and the magnetic field in which the coil rotates

**8.34×10**^{-3}Tif its frequency is

**89 Hz**which of the followingis the equation of instantaneous

**emf**induced**(ε)**of this generatorCorrectIncorrect - Question 30 of 50
##### 30. Question

Calculate the unknown value in the corresponding table:

CorrectIncorrect - Question 31 of 50
##### 31. Question

The speed of sound depends on the temperature of the medium,

this dependence is more noticeable in:

CorrectIncorrect - Question 32 of 50
##### 32. Question

A capacitor of capacitance

**400 μF**is connected in series to a pure resistor of resistance

**10 Ω**across an**AC**source

of frequency**Hz$\frac{250}\pi$**If the effective value of the potential difference across the capacitor is

**18 V**Find the effective potential difference across the pure resistor

CorrectIncorrect - Question 33 of 50
##### 33. Question

The distance between center two billiard balls of same masses is

**0.3 m**,if the magnitude of the gravitational force between them is

**9.05 × 10**^{-11}Nwhat is the mass of one of those balls?

$G=6.673\times10^{-11}\frac{N\cdot m^2}{kg^2}$

CorrectIncorrect - Question 34 of 50
##### 34. Question

A fire engine is moving at 50 m/s and sounding its horn of frequency 1500 Hz.

A Van in front of the fire engine is moving at 35 m/s and in the same direction,

what is the frequency that the driver of Van hear

**(speed of sound in air 345 m/s)**CorrectIncorrect - Question 35 of 50
##### 35. Question

An AC source of effective value of

**90 V**is connectedacross a parallel combination of resistance of

**R = 300 Ω**,an inductor of impedance of

**XL = 600 Ω**and a capacitor of impedance of

**XC = 200 Ω,**Calculate the value of the effective current of the source?

CorrectIncorrect - Question 36 of 50
##### 36. Question

Because of Earth’s rotation

CorrectIncorrect - Question 37 of 50
##### 37. Question

If the intensity of a sound is

$1\frac w{m^2}$what is the relative intensity of this sound

CorrectIncorrect - Question 38 of 50
##### 38. Question

What is the ratio of the number of turns of wire

on the primary to the number of turns on the secondary in the

corresponding transformerCorrectIncorrect - Question 39 of 50
##### 39. Question

Which rotational quantity is equivalent to force in transitional motion

CorrectIncorrect - Question 40 of 50
##### 40. Question

A violin string that is

**50 cm**long has a fundamental frequency of**440 Hz.**What is the speed of the waves on this string

CorrectIncorrect - Question 41 of 50
##### 41. Question

Two coherent light waves of the same wavelength they interfere,

If the interference is constructive, then the

wavelength of the resultant wave is:CorrectIncorrect - Question 42 of 50
##### 42. Question

When the ice skater brings his hands and feet closer to his body,

When the net external torque acting on him is zero.

Which of the following is true for

**[ his moment of inertia (𝐼) , his angular speed (𝜔) , his angular momentum (𝐿)]**CorrectIncorrect - Question 43 of 50
##### 43. Question

We can express the unit of the magnetic field (

**Tesla T**) in which of the followingCorrectIncorrect - Question 44 of 50
##### 44. Question

If the angle of phase difference between two coherent waves is

**(6 𝜋 𝑟𝑎𝑑)**the path difference between two waves is

CorrectIncorrect - Question 45 of 50
##### 45. Question

A

**700 N**window washer is standing on a uniform scaffold supported by a vertical rope at each end.The scaffold weighs

**200 N**and is**3 m**long. What is the force in the ropethat is nearest to the window washer if he stands1 m from one end

CorrectIncorrect - Question 46 of 50
##### 46. Question

. A direct current of 10 A passes thought a solenoid, i

f the magnitude of magnetic field in the middle of the solenoid is

**$\frac\pi{40}T$**calculate the number of turns per unit length: (

**μ=4πx10**)^{-7}T.m/ACorrectIncorrect - Question 47 of 50
##### 47. Question

Which of the following

**is not an essential**component of a laseCorrectIncorrect - Question 48 of 50
##### 48. Question

The corresponding figure represents the angle of phase

difference between the current intensity and the alternating

potential difference for which of the followingCorrectIncorrect - Question 49 of 50
##### 49. Question

Suppose an electron is chasing a proton to the north

when suddenly a magnetic field pointing the south is applied.

What would happen to the particlesCorrectIncorrect - Question 50 of 50
##### 50. Question

Monochromatic light from a laser source

**(helium-neon)**of wavelength**λ =632.8 nm**shines at a right angle to the surface of a diffraction

grating that contains

**150 500 lines/m.**Find the angle at which one would observe the first order bright fringe

CorrectIncorrect