پرسیاری وزاری فیزیا 2023-2024 خولی یەکەم ، خوێندنی ئینگلیزی

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 $\left(I=\frac12mr^2\right)$

11N.m-

Correct Incorrect Correct answer

0.86N.m-

Correct Incorrect Correct answer

1.9N.m-

Correct Incorrect Correct answer

8N.m-

Correct Incorrect Correct answer

Which of the following correctly describe the direction of

magnetic field around straight wire when a direct current
pass through it

Correct Incorrect Correct answer

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 long

1 rad/s²

Correct Incorrect Correct answer

0 rad/s²

Correct Incorrect Correct answer

2.5 rad/s²

Correct Incorrect Correct answer

12.5 rad/s²

Correct Incorrect Correct answer

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 :

0.375J

Correct Incorrect Correct answer

0.25J

Correct Incorrect Correct answer

3.75J

Correct Incorrect Correct answer

1.5J

Correct Incorrect Correct answer

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 job

56Ω

Correct Incorrect Correct answer

0.9Ω

Correct Incorrect Correct answer

0.56Ω

Correct Incorrect Correct answer

1.2Ω

Correct Incorrect Correct answer

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 by

the 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

1800N.m

Correct Incorrect Correct answer

3118N.m

Correct Incorrect Correct answer

900N.m

Correct Incorrect Correct answer

3200N.m

Correct Incorrect Correct answer

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

elastic force spring

Correct Incorrect Correct answer

velocity

Correct Incorrect Correct answer

acceleration

Correct Incorrect Correct answer

elastic potential energy stored in spring

Correct Incorrect Correct answer

. 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 N,

find the magnitude of magnetic field at this location

5×10^-5T

Correct Incorrect Correct answer

5×10^-3T

Correct Incorrect Correct answer

5×10^-6T

Correct Incorrect Correct answer

5×10^-2T

Correct Incorrect Correct answer

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

transverse wave

Correct Incorrect Correct answer

longitudinal wave

Correct Incorrect Correct answer

sound wave

Correct Incorrect Correct answer

(A and B) are correct

Correct Incorrect Correct answer

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

The length of the string

Correct Incorrect Correct answer

The mass of the pendulum bob

Correct Incorrect Correct answer

) The free-fall acceleration at the pendulum’s location

Correct Incorrect Correct answer

All answers are correct

Correct Incorrect Correct answer

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 field

The coil is pulled steadily out of the field in 0.25 s.

Find the average induced (𝜀) during this interval

0.6V

Correct Incorrect Correct answer

1.2V

Correct Incorrect Correct answer

0.3V

Correct Incorrect Correct answer

0.15V

Correct Incorrect Correct answer

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

speed of sound

Correct Incorrect Correct answer

intensity

Correct Incorrect Correct answer

wavelength

Correct Incorrect Correct answer

frequency

Correct Incorrect Correct answer

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:

from left to right

Correct Incorrect Correct answer

from right to left

Correct Incorrect Correct answer

in two opposite directions

Correct Incorrect Correct answer

All Answers are wrong

Correct Incorrect Correct answer

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

torque(t)

Correct Incorrect Correct answer

angular momentum(L)

Correct Incorrect Correct answer

moment of inertia (I)

Correct Incorrect Correct answer

angular acceleration (α)

Correct Incorrect Correct answer

. In the figure Wire 1 carries current I₁ and creates magnetic field B₁, Wire 2 carries current I2
and creates magnetic field B₂ . What is the direction of the magnetic force acting on wire 1
as a result of B₂

to the right of page

Correct Incorrect Correct answer

down the page

Correct Incorrect Correct answer

up the page

Correct Incorrect Correct answer

o the left of page

Correct Incorrect Correct answer

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

0.15m/s

Correct Incorrect Correct answer

0.3m/s

Correct Incorrect Correct answer

0.45m/s

Correct Incorrect Correct answer

0.725m/s

Correct Incorrect Correct answer

Machine that converts electrical energy to mechanical energy

ignition coil in a gasoline engine

Correct Incorrect Correct answer

motor

Correct Incorrect Correct answer

generator

Correct Incorrect Correct answer

transformer

Correct Incorrect Correct answer

The (Maser) device works In the region of which of the following waves

infrared

Correct Incorrect Correct answer

Ultraviolet waves

Correct Incorrect Correct answer

X- ray

Correct Incorrect Correct answer

Microwaves

Correct Incorrect Correct answer

How many revolutions (rev) equal 270°

2rev

Correct Incorrect Correct answer

1.3rev

Correct Incorrect Correct answer

0.75rev

Correct Incorrect Correct answer

1rev

Correct Incorrect Correct answer

If the wavelength of standing wave on a string is 90 cm

What is the distance between two adjacent nodes on that
string

22.25cm

Correct Incorrect Correct answer

90cm

Correct Incorrect Correct answer

180cm

Correct Incorrect Correct answer

45cm

Correct Incorrect Correct answer

Ohm (Ω) equals to

1/Hz.F

Correct Incorrect Correct answer

Hz.H

Correct Incorrect Correct answer

V.s/A

Correct Incorrect Correct answer

(A and B) are correct

Correct Incorrect Correct answer

Which of the following represents Hook’s law

Correct Incorrect Correct answer

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 turns

13rad/s

Correct Incorrect Correct answer

31rad/s

Correct Incorrect Correct answer

36rad/s

Correct Incorrect Correct answer

63rad/s

Correct Incorrect Correct answer

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 wave if the interference is constructive

0.22m

Correct Incorrect Correct answer

0.53m

Correct Incorrect Correct answer

0.75m

Correct Incorrect Correct answer

1.28m

Correct Incorrect Correct answer

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 zero

6.25×10^-2H

Correct Incorrect Correct answer

1.59×10^-2H

Correct Incorrect Correct answer

2.2×10^-2H

Correct Incorrect Correct answer

2.98×10^-2H

Correct Incorrect Correct answer

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?

induced (𝜀) is generated, (a) positive pole, and (b) negative pole

Correct Incorrect Correct answer

induced (𝜀) is generated, (a) negative pole, and (b) positive pole

Correct Incorrect Correct answer

induced (𝜀) is generated, (a) positive pole, and (b) positive pole

Correct Incorrect Correct answer

No induced (𝜀) is generated

Correct Incorrect Correct answer

A bicyclist rides along a circular track.

If the bicyclist travels around exactly

half the track in 20 s, what is his average angular speed

0.314rad/s

Correct Incorrect Correct answer

0.61rad/s

Correct Incorrect Correct answer

0.157rad/s

Correct Incorrect Correct answer

31rad/s

Correct Incorrect Correct answer

How many nodes and antinodes are in the fifth harmonic

(𝑓5) in pipe closed at one end

(five nodes and five antinodes)

Correct Incorrect Correct answer

(four nodes and four antinodes)

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(three nodes and three antinodes)

Correct Incorrect Correct answer

(four nodes and five antinodes)

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. 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^-3T

if its frequency is 89 Hz which of the following

is the equation of instantaneous emf induced (ε) of this generator

ε=245 sin(559t)

Correct Incorrect Correct answer

ε=245 sin(89t)

Correct Incorrect Correct answer

ε=245 sin(559πt)

Correct Incorrect Correct answer

ε=78 sin(78πt)

Correct Incorrect Correct answer

Calculate the unknown value in the corresponding table:

1.294rad/s

Correct Incorrect Correct answer

2.2rad/s

Correct Incorrect Correct answer

29rad/s

Correct Incorrect Correct answer

15rad/s

Correct Incorrect Correct answer

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

this dependence is more noticeable in:

Solid

Correct Incorrect Correct answer

Gas

Correct Incorrect Correct answer

Liquid

Correct Incorrect Correct answer

All answers are correct

Correct Incorrect Correct answer

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

32V

Correct Incorrect Correct answer

42.6V

Correct Incorrect Correct answer

36V

Correct Incorrect Correct answer

57V

Correct Incorrect Correct answer

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 N

what is the mass of one of those balls?

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

0.8kg

Correct Incorrect Correct answer

0.35kg

Correct Incorrect Correct answer

0.45kg

Correct Incorrect Correct answer

0.75kg

Correct Incorrect Correct answer

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)

1576Hz

Correct Incorrect Correct answer

1932Hz

Correct Incorrect Correct answer

1048Hz

Correct Incorrect Correct answer

1177Hz

Correct Incorrect Correct answer

An AC source of effective value of 90 V is connected

across 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?

212.13A

Correct Incorrect Correct answer

0.42A

Correct Incorrect Correct answer

2.1213A

Correct Incorrect Correct answer

4.2A

Correct Incorrect Correct answer

Because of Earth’s rotation

) the weight of the body at the equator is less than the weight of the body at the poles

Correct Incorrect Correct answer

the weight of the body at the equator is greater than the weight of the body at the poles .

Correct Incorrect Correct answer

the weight of the body at the equator is equal to the weight of the body at the poles.

Correct Incorrect Correct answer

the mass of the body at the equator is less than the mass of the body at the poles.

Correct Incorrect Correct answer

If the intensity of a sound is
$1\frac w{m^2}$

what is the relative intensity of this sound

60dB

Correct Incorrect Correct answer

0dB

Correct Incorrect Correct answer

120dB

Correct Incorrect Correct answer

40dB

Correct Incorrect Correct answer

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 transformer

$\frac1{20}$

Correct Incorrect Correct answer

$\frac{20}1$

Correct Incorrect Correct answer

$\frac{24.6}1$

Correct Incorrect Correct answer

$\frac{156}1$

Correct Incorrect Correct answer

Which rotational quantity is equivalent to force in transitional motion

rotational kinetic energy (𝐾𝐸𝑟𝑜𝑡 )

Correct Incorrect Correct answer

angular momentum (𝐿)

Correct Incorrect Correct answer

moment of inertia (𝐼)

Correct Incorrect Correct answer

torque (𝜏)

Correct Incorrect Correct answer

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

220m/s

Correct Incorrect Correct answer

880m/s

Correct Incorrect Correct answer

440m/s

Correct Incorrect Correct answer

110m/s

Correct Incorrect Correct answer

Two coherent light waves of the same wavelength they interfere,

If the interference is constructive, then the
wavelength of the resultant wave is:

zero

Correct Incorrect Correct answer

the same wavelength of either of two waves

Correct Incorrect Correct answer

twice wavelength of either of these waves

Correct Incorrect Correct answer

less than the wavelength of either of these waves

Correct Incorrect Correct answer

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)]

(𝐼) decrease , (𝜔) increase, (𝐿) constant

Correct Incorrect Correct answer

(𝐼) increase, (𝜔) decrease, (𝐿) increase

Correct Incorrect Correct answer

(𝐼) decrease , (𝜔) increase, (𝐿) increase

Correct Incorrect Correct answer

(𝐼) increase, (𝜔) increase, (𝐿) constant

Correct Incorrect Correct answer

We can express the unit of the magnetic field (Tesla T) in which of the following

$\frac N{A.m}$

Correct Incorrect Correct answer

$\frac{N^2}{A\cdot m}$

Correct Incorrect Correct answer

$\frac N{A.m^2}$

Correct Incorrect Correct answer

$\frac{N^2}{A\cdot m^2}$

Correct Incorrect Correct answer

If the angle of phase difference between two coherent waves is (6 𝜋 𝑟𝑎𝑑)

the path difference between two waves is

$\frac13\lambda$

Correct Incorrect Correct answer

$4\lambda$

Correct Incorrect Correct answer

$3\lambda$

Correct Incorrect Correct answer

$\frac32\lambda$

Correct Incorrect Correct answer

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 rope

that is nearest to the window washer if he stands1 m from one end

333N

Correct Incorrect Correct answer

900N

Correct Incorrect Correct answer

500N

Correct Incorrect Correct answer

567N

Correct Incorrect Correct answer

. 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^-7T.m/A)

2500 turn/m

Correct Incorrect Correct answer

4250 turn/m

Correct Incorrect Correct answer

6250 turn/m

Correct Incorrect Correct answer

5500 turn/m

Correct Incorrect Correct answer

Which of the following is not an essential component of a lase

a partially transparent mirror

Correct Incorrect Correct answer

a fully reflecting mirror

Correct Incorrect Correct answer

a converging lens D

Correct Incorrect Correct answer

an active medium

Correct Incorrect Correct answer

The corresponding figure represents the angle of phase
difference between the current intensity and the alternating
potential difference for which of the following

Pure resistance circuit

Correct Incorrect Correct answer

A pure self-inductance circuit

Correct Incorrect Correct answer

A capacitor circuit

Correct Incorrect Correct answer

circuit in resonance

Correct Incorrect Correct answer

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 particles

) proton would go east, and the electron would go west.

Correct Incorrect Correct answer

proton would go west, and the electron would go east

Correct Incorrect Correct answer

proton and electron would go to west

Correct Incorrect Correct answer

no magnetic force will be exerted on proton and electron

Correct Incorrect Correct answer

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

0.125^o

Correct Incorrect Correct answer

10.98^o

Correct Incorrect Correct answer

0.63^o

Correct Incorrect Correct answer

5.465^o

Correct Incorrect Correct answer

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