فیزیا 2021-2020 خولی دووەم خوێندنی ئینگلیزی

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

34N.m

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11N.m

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17N.m

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23N.m

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A wave that requires a medium through which to travel

mechanical wave

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infrared (IR)waves

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microwaves

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X rays

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

Drop them from the same height

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Roll them down an incline

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weigh them on a scale

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both (A and C) are true

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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/s²

0.17

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0.05

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0.03

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0.02

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Find the direction of the magnetic force on the current –carrying
wire as in Figure

out of the page

Correct Incorrect Correct answer

into the page

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down the page

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up the page

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

3

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6

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9

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18

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

the induced field attempts to keep the total field is

keep constant

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increased

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decreased

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none of them

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

1

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2

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3

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4

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

L=Iω

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L=Iω²

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L=1/2Iω

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L=rω

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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 coil

2×10^-4v

Correct Incorrect Correct answer

-2v

Correct Incorrect Correct answer

4v

Correct Incorrect Correct answer

-2×10^-4v

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If the intensity of a sound is 1W/m² what is the relative intensity of this sound

0dB

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60dB

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120dB

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40dB

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

2m

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4m

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5m

Correct Incorrect Correct answer

7m

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Three identical vibrating simple pendulum of same length the first one on surface
of the Earth [a_g=9.81m/s²], the second one on the surface of the moon [a_g=1.63m/s²] and the third one on the surface of the Mars[a_g=3.7m/s²]

? Which one of them has greater period

On Moon

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On Earth

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On Mars

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All have the same periods

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The unit for measuring Magnetic flux(Φ) is

wb

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T

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T.m²

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both A and C are true

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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

3.75m/s

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2.25m/s

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0.5m/s

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5m/s

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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 displacement

elastic potential energy

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gravitational potential energy

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kinetic energy

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kinetic energy and Elastic potential energy

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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

5×10^-5T

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3×10^-3T

Correct Incorrect Correct answer

3×10^-5T

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5×10^-2T

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

Normal force of track

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weight of bicycle

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friction force between tires and the track

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the force of seat bicycle on the bicyclist

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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

0.22m

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0.53m

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0.75m

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1.28m

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In which situation, the direction of the magnetic force
on a proton moves in a magnetic field is to left of the page

Correct Incorrect Correct answer

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

a line drawn along the direction of the force

torque(τ)

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orce(F)

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lever arm(d sin θ)

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moment of inertia (I)

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

Infrasonic waves

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Ultrasonic waves

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Audible sound waves

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All of them are true

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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 orchestra

9.81×10^-3w/m²

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7.81×10^-3w/m²

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8.91×10^-3w/m²

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6.81×10^-3w/m²

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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

1.9m/s²

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1.2m/s²

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4m/s²

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186m/s²

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? 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)

(35.2Hz) (105.6Hz)

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(106Hz) (176Hz)

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(70.4Hz) (40.8Hz)

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(35.2Hz) (70.4Hz)

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

depends on which of the following

Length of the wire in the field

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Velocity with which the wire moving through the magnetic field

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Strength of the magnetic field

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all the answers are correct

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Earth of mass (m=597×10²⁴kg) orbits the sun with mass (m=1.99×10³⁰kg) at a mean distance of 1.5×10¹¹m. what is the gravitational force of the sun on Earth? (G=6.673×10^-11 N.m²/kg²)

5.29×10³²N

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5.2×10^-2N

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3.52×10²²N

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1.77×10^-8N

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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)

1076Hz

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834Hz

Correct Incorrect Correct answer

1234Hz

Correct Incorrect Correct answer

934Hz

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

Solid

Correct Incorrect Correct answer

Liquid

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Gas

Correct Incorrect Correct answer

All the answers are correct

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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

1m/s

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10m/s

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2.5m/s

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25m/s

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

0.26rad

Correct Incorrect Correct answer

0.39rad

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0.52rad

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0.79rad

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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

0.5kg.m²

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1kg.m²

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3kg.m²

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4kg.m²

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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?

3 m from the center

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2.2 m from the center

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3.5 m from the center

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2.5 m from the center

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

1/5

Correct Incorrect Correct answer

1/5

Correct Incorrect Correct answer

5

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1/25

Correct Incorrect Correct answer

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

by moving the loop into or out of the magnetic field

Correct Incorrect Correct answer

by rotating the loop inside the magnetic field

Correct Incorrect Correct answer

by changing the strength of the magnetic field through the static loop

Correct Incorrect Correct answer

All of them are correct

Correct Incorrect Correct answer

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

self-induction

Correct Incorrect Correct answer

Magnetic permeability of medium

Correct Incorrect Correct answer

mutual induction

Correct Incorrect Correct answer

friction

Correct Incorrect Correct answer

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

To the East

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To the North

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To the South

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To the Sky

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.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 stops

55rev

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66rev

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22rev

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33rev

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

a ball from the roof of a house

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a wheel rotates

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a ball rolling toward the goal

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both B and C are correct

Correct Incorrect Correct answer

Which of the following is a correct interpretation of the expression

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

The magnetic field inside a solenoid is weak and nonuniform

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The magnetic field outside solenoid is strong and uniform

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The intensity of the magnetic is inversely proportional with amount of current

Correct Incorrect Correct answer

The magnetic field inside solenoid is strong and nearly uniform

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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

The driver of the car

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The driver of the van

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The driver of the fire engine

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All of them have same pitch heard

Correct Incorrect Correct answer

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 true

The smaller club is likely to have a larger moment of inertia

Correct Incorrect Correct answer

The ends of each club will trace out parabolas as the club is thrown

Correct Incorrect Correct answer

The Centre of mass of each club will trace out a parabola as the club is thrown

Correct Incorrect Correct answer

Both A and B are correct

Correct Incorrect Correct answer

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

Oersted’s

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Faraday’s

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Ohm’s

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Newton’s

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

‏speed

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frequency

Correct Incorrect Correct answer

period

Correct Incorrect Correct answer

both B and C are true

Correct Incorrect Correct answer

The speed of all electromagnetic waves in empty space is 3 ×108 m/s. Calculate the wavelength
of radio waves at frequency 88 MH

5×10^-6m

Correct Incorrect Correct answer

3.41m

Correct Incorrect Correct answer

5×10^-7m

Correct Incorrect Correct answer

1×10^-10m

Correct Incorrect Correct answer

?The mutual inductance between two coil depends on what

Only the geometrical properties of the coils

Correct Incorrect Correct answer

Only the orientation of the coils to each other

Correct Incorrect Correct answer

Both the geometrical properties of the coils and their orientation to each other

Correct Incorrect Correct answer

none of them

Correct Incorrect Correct answer

Eddy currents are used in

Furnaces

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Car brake systems

Correct Incorrect Correct answer

Detecting metals in airports underground

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In all of them

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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

35rad

Correct Incorrect Correct answer

4.1rad

Correct Incorrect Correct answer

35rev

Correct Incorrect Correct answer

90^o

Correct Incorrect Correct answer

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

(T/6) S

Correct Incorrect Correct answer

(T/3) S

Correct Incorrect Correct answer

3T s

Correct Incorrect Correct answer

6T s

Correct Incorrect Correct answer

A rectangular coil with area 0.0046 m²is 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 coil

1.05A

Correct Incorrect Correct answer

8.27A

Correct Incorrect Correct answer

0.12A

Correct Incorrect Correct answer

0.26A

Correct Incorrect Correct answer

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