# فیزیا 2021-2020 خولی دووەم خوێندنی ئینگلیزی

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

A bucket filled with water has a mass of 22.5 kg and

is attached to a rope that is wound around a cylinder with a radius of 0.05 m at the top of a well

What torque does the bucket produce on the cylinder

CorrectIncorrect - Question 2 of 50
##### 2. Question

A wave that requires a medium through which to travel

CorrectIncorrect - Question 3 of 50
##### 3. Question

Two spheres have the same mass One is hollow, and the other is solid. Which method would determine which is which

CorrectIncorrect - Question 4 of 50
##### 4. Question

A car traveling at 65 km/h on a flat surface turn in a circle with a radius 195 m, Find the minimum coefficient of static friction between the tires and the road that will allow the care to round the curve

a

_{g}=9.81m/s^{2}CorrectIncorrect - Question 5 of 50
##### 5. Question

Find the direction of the magnetic force on the current –carrying

wire as in FigureCorrectIncorrect - Question 6 of 50
##### 6. Question

When a mechanical wave of amplitude is tripled, the energy the wave carries in a given time interval is increased by a factor of

CorrectIncorrect - Question 7 of 50
##### 7. Question

According to Lenz’s law, if the applied magnetic field of circuit is changed

the induced field attempts to keep the total field is

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

When you break a magnet in half, how many poles does each piece have

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

Which of the following equations is correct to calculate the angular momentum

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

If the coefficient of self-induction of the coil is 0.02 H, and If time rate of increase current is 100 A/s calculate the

induced emf in the coilCorrectIncorrect - Question 11 of 50
##### 11. Question

If the intensity of a sound is 1W/m

^{2}what is the relative intensity of this soundCorrectIncorrect - Question 12 of 50
##### 12. Question

Which of the following wavelengths will produce standing waves on a string that is 3 m long

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

Three identical vibrating simple pendulum of same length the first one on surface

of the Earth [a_{g}=9.81m/s^{2}], the second one on the surface of the moon [a_{g}=1.63m/s^{2}] and the third one on the surface of the Mars[a_{g}=3.7m/s^{2}]? Which one of them has greater period

CorrectIncorrect - Question 14 of 50
##### 14. Question

The unit for measuring Magnetic flux(Φ) is

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

A wave traveling in the positive 𝑥 direction with a frequency of 25 Hz as shown in the figure. Find the speed of this wave

CorrectIncorrect - Question 16 of 50
##### 16. Question

A mass is attached to a spring and moves with simple harmonic motion on a frictionless horizontal

surface in what form is the energy in the system when the mass is at maximum displacementCorrectIncorrect - Question 17 of 50
##### 17. Question

A wire 36 m long carries a current of 22 A. If the magnetic force on the wire due to Earth’s magnetic field has a magnitude of 4 × 10-2 N, find the magnitude of the magnetic field at this point

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

Identify the source of force that maintains circular motion of (a bicycle moving around a flat circular track)

CorrectIncorrect - Question 19 of 50
##### 19. Question

A wave with an amplitude of 0.75 m has the same wave length

as a second wave with an amplitude of 0.53 m the two waves interfere

What is the amplitude of the resultant waves if the interference is constructive

CorrectIncorrect - Question 20 of 50
##### 20. Question

In which situation, the direction of the magnetic force

on a proton moves in a magnetic field is to left of the pageCorrectIncorrect - Question 21 of 50
##### 21. Question

is the perpendicular distance from the axis of rotation to…..

a line drawn along the direction of the force

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

The sound waves with frequencies greater than 20 kHz, and cannot be heard by human ear are called,

CorrectIncorrect - Question 23 of 50
##### 23. Question

At a maximum level of loudness, the power output of a 75-piece orchestra radiated as sound is

70 W. What is the intensity of these sound waves to a listener who is sitting 25 m from the orchestraCorrectIncorrect - Question 24 of 50
##### 24. Question

If the radius of car tire is 0.3 m rotates at an initial angular speed of 14 rad/s. The driver accelerates, and after 3.5s the tire’s angular speed is 28 rad/s. What is tangential acceleration of a point at the edge of tire

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

? What are the first two harmonics in a 2.45 m long pipe that is closed at one end

(The speed of sound in pipe is 345 m/s)

CorrectIncorrect - Question 26 of 50
##### 26. Question

The magnitude of the induced electromotive force (ε) in a straight conductor(wire)

depends on which of the following

CorrectIncorrect - Question 27 of 50
##### 27. Question

Earth of mass (m=597×10

^{24}kg) orbits the sun with mass (m=1.99×10^{30}kg) at a mean distance of 1.5×10^{11}m. what is the gravitational force of the sun on Earth? (G=6.673×10^{-11}N.m^{2}/kg^{2})CorrectIncorrect - Question 28 of 50
##### 28. Question

A police car moves at a speed of 86.4 Km/h and emit a siren of frequency 1000 Hz. What is the frequency

of the sound as detected by a standing observer as the police car moves away from him

?(speed of sound in air is 340 m/s)CorrectIncorrect - Question 29 of 50
##### 29. Question

:The speed of sound depends on the temperature of the medium, this dependence is more noticeable in

CorrectIncorrect - Question 30 of 50
##### 30. Question

Find the tangential speed of a ball swung at a constant angular speed of 5 rad/s on a rope that is 0.5 m long

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

.Earth is rotate 360o every 24h what is the angular displacement of a person standing at the equator for 3 h

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

A bicyclist exerts a constant force of 40 N on a pedal 0.15 m from the axis of rotation of a bicycle wheel with a

? radius of 50 cm. If his speed is 2.25 m/s after 3 s he starts from rest, what is the moment of inertia of the wheel (Disregard friction and the moment of inertia of the other wheel

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

A uniform 40 N board supports two children, one weighing 510N and the other weighing 340 N. The support is under the center of mass of the board, and the 510 N children is 2 m from the center. Where should the second child sit to balance the system?

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

By what factor does the distance change from the sound source If the sound intensity becomes five times as the ? original intensity

CorrectIncorrect - Question 35 of 50
##### 35. Question

?Which of the following ways can induce a current inside a closed circular loop

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

The symbol(μ) in this equation B=μ/2π=1/d is called Coefficient of

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

A wire carrying a current is arranged so that electrons flow in one segment from west to east.

?If a compass is held over this segment of the wire, in what direction is the needle deflected

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

.The tub within a washer rotate with angular speed of 11 π rad/s then the tub slows to rest in 12 s , how many

revolutions does the tub turn until the tub stopsCorrectIncorrect - Question 39 of 50
##### 39. Question

.In which of the following should the object (s) be treated as an extended object

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

Which of the following is a correct interpretation of the expression

[The magnetic field due to a direct current in a solenoid]

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

A fire engine is moving at 40 m/s and sounding its horn. Another car in front of the fire engine is moving

at 30m/s in the same direction and a van in front of the car is stationary who observer hears the fire engine’s horn at a higher pitch

CorrectIncorrect - Question 42 of 50
##### 42. Question

At a circus performance, a juggler is throwing two spinning clubs. One of the clubs is heavier than the other

Which of the following statements is trueCorrectIncorrect - Question 43 of 50
##### 43. Question

..……law Used to determine the magnitude of induced electromotive force (emf)

CorrectIncorrect - Question 44 of 50
##### 44. Question

When a part of a sound wave travels from air into water, which property of the wave remains unchanged

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

The speed of all electromagnetic waves in empty space is 3 ×108 m/s. Calculate the wavelength

of radio waves at frequency 88 MHCorrectIncorrect - Question 46 of 50
##### 46. Question

?The mutual inductance between two coil depends on what

CorrectIncorrect - Question 47 of 50
##### 47. Question

Eddy currents are used in

CorrectIncorrect - Question 48 of 50
##### 48. Question

When a wheel is rotated through an angle of 35°, a point on the circumference travels through an arc length of 2.49 m, what is the angular displacement of the same point when travels through an arc length of 143 m

CorrectIncorrect - Question 49 of 50
##### 49. Question

A pendulum vibrates after uniform so that its frequency changes from 10 Hz to 30 Hz, in this case its period from (T) second will change to

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

A rectangular coil with area 0.0046 m

^{2 }is positioned so that its cross-sectional area is perpendicular to the

direction of a magnetic field,B⃑ if the coil has 75 turns and a total resistance of 8.6 Ω and the field decreases

at a rate of 3 T/s, what is the magnitude of the induced current in the coilCorrectIncorrect