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?

180N

Correct Incorrect Correct answer

280N

Correct Incorrect Correct answer

400N

Correct Incorrect Correct answer

700N

Correct Incorrect Correct answer

$=\frac{N.S}{C.m}$……………………

T

Correct Incorrect Correct answer

V

Correct Incorrect Correct answer

H

Correct Incorrect Correct answer

Wb

Correct Incorrect Correct answer

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

The composition of the active medium

Correct Incorrect Correct answer

fully reflecting mirror

Correct Incorrect Correct answer

partially reflecting mirror

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(B and C) are correct

Correct Incorrect Correct answer

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?

$\frac12$

Correct Incorrect Correct answer

2

Correct Incorrect Correct answer

4

Correct Incorrect Correct answer

$\frac14$

Correct Incorrect Correct answer

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?

0.075N

Correct Incorrect Correct answer

7.5N

Correct Incorrect Correct answer

0.75N

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75N

Correct Incorrect Correct answer

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

5000

Correct Incorrect Correct answer

500

Correct Incorrect Correct answer

50000

Correct Incorrect Correct answer

500000

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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?

‌0.6Kg.m²

Correct Incorrect Correct answer

‌6Kg.m²

Correct Incorrect Correct answer

‌1.2Kg.m²

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‌12Kg.m²

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

Motor

Correct Incorrect Correct answer

Transformer

Correct Incorrect Correct answer

Galvanometer

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Loudspeaker

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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

‌4.5×10¹⁴Hz

Correct Incorrect Correct answer

‌3.5×10¹⁴Hz

Correct Incorrect Correct answer

‌5.7×10¹⁴Hz

Correct Incorrect Correct answer

‌2.5×10¹⁴Hz

Correct Incorrect Correct answer

Which letter on the graph is used for wave amplitude?

A

Correct Incorrect Correct answer

B

Correct Incorrect Correct answer

C

Correct Incorrect Correct answer

D

Correct Incorrect Correct answer

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

$B=\frac{\mu NI}r$

Correct Incorrect Correct answer

$B=\frac{\mu NI}l$

Correct Incorrect Correct answer

$B=\frac{\mu I}{2\pi d}$

Correct Incorrect Correct answer

$B=\frac{\mu NI}2$

Correct Incorrect Correct answer

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

Atoms are hard, uniform, indestructible spheres

Correct Incorrect Correct answer

Electrons are embedded in a sphere of positive charge

Correct Incorrect Correct answer

Electrons orbit the nucleus in the same way that planets orbit the sun

Correct Incorrect Correct answer

Electrons exist only at discrete energy levels

Correct Incorrect Correct answer

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)

2.4m

Correct Incorrect Correct answer

0.6m

Correct Incorrect Correct answer

0.3m

Correct Incorrect Correct answer

12m

Correct Incorrect Correct answer

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

$\frac1{30}$ step -up transformer

Correct Incorrect Correct answer

$\frac{30}1$ step -up transformer

Correct Incorrect Correct answer

$\frac1{30}$ step – down transformer

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$\frac{30}1$ step – down transformer

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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)

‌1.2×10¹⁴Hz

Correct Incorrect Correct answer

‌1.5×10¹⁴Hz

Correct Incorrect Correct answer

‌1.2×10¹⁵Hz

Correct Incorrect Correct answer

‌2.5×10¹⁴Hz

Correct Incorrect Correct answer

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:

The frequency pendulum will increase

Correct Incorrect Correct answer

The frequency does not change

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The period pendulum does not change

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both (B and C) are correct

Correct Incorrect Correct answer

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?

1MW

Correct Incorrect Correct answer

5MW

Correct Incorrect Correct answer

5KW

Correct Incorrect Correct answer

1KW

Correct Incorrect Correct answer

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

forward

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reverse

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forward and reverse

Correct Incorrect Correct answer

All answers are correct

Correct Incorrect Correct answer

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?

16cm

Correct Incorrect Correct answer

19cm

Correct Incorrect Correct answer

8cm

Correct Incorrect Correct answer

18cm

Correct Incorrect Correct answer

Lenz’s law determines which of the following:

magnitude of induced current

Correct Incorrect Correct answer

magnitude of induced (ε)

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direction of an induced current

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all answers are correct

Correct Incorrect Correct answer

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

Ultraviolet catastrophe

Correct Incorrect Correct answer

Compton Shift

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Doppler effect

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Black body radiation

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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?

$rad/s^2$1

Correct Incorrect Correct answer

$rad/s^2$3

Correct Incorrect Correct answer

$rad/s^2$1.9

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$rad/s^2$3.5

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ωc= ……………………..

$x_c$

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$\frac1{x_c}$

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$2\pi f$

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$\frac{2\pi f}c$

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The symbol ( M ) in this equation

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

is called

Mass

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Coefficient of mutual induction

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Magnetic permeability of the medium

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Constant of universal gravitation

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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?

Correct Incorrect Correct answer

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)

6.64N

Correct Incorrect Correct answer

66.4N

Correct Incorrect Correct answer

664N

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700N

Correct Incorrect Correct answer

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?

gravitational potential energy

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kinetic energy

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restoring force

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total mechanical energy

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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?

100Hz

Correct Incorrect Correct answer

55Hz

Correct Incorrect Correct answer

314Hz

Correct Incorrect Correct answer

628Hz

Correct Incorrect Correct answer

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

an electron in the innermost shell of a copper atom

Correct Incorrect Correct answer

a valence electron in a copper atom in a wire

Correct Incorrect Correct answer

an electron in the conduction band of the semiconductor germanium

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Both (B) and (C) are correct

Correct Incorrect Correct answer

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

1.3rad

Correct Incorrect Correct answer

31rad

Correct Incorrect Correct answer

0.61rad

Correct Incorrect Correct answer

6.3rad

Correct Incorrect Correct answer

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

‌λ_audiable<λ_ultrasonic

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‌ƒ_audiable<ƒ_{𝐼nfrasonic}

Correct Incorrect Correct answer

‌λ_audiable=λ_ultrasonic

Correct Incorrect Correct answer

‌ƒ_audiable>ƒ_{𝐼nfrasonic}

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

1.78A

Correct Incorrect Correct answer

1.26A

Correct Incorrect Correct answer

0.707A

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145A

Correct Incorrect Correct answer

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

‌180^o

Correct Incorrect Correct answer

0

Correct Incorrect Correct answer

‌30^o

Correct Incorrect Correct answer

‌90^o

Correct Incorrect Correct answer

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?

The observer and car are at rest with respect to each other

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The observer is moving toward car

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The car is moving toward observer

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The car is moving away from observer

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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?

‌90^o

Correct Incorrect Correct answer

‌45^o

Correct Incorrect Correct answer

0

Correct Incorrect Correct answer

‌180^o

Correct Incorrect Correct answer

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

It has tangential acceleration but no centripetal acceleration

Correct Incorrect Correct answer

It has centripetal acceleration but no tangential acceleration.

Correct Incorrect Correct answer

It has both centripetal acceleration and tangential acceleration

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It doesn't have tangential acceleration and centripetal acceleration

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

1

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2

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3

Correct Incorrect Correct answer

1 , 3

Correct Incorrect Correct answer

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

24.52N/m

Correct Incorrect Correct answer

2666N/m

Correct Incorrect Correct answer

1990N/m

Correct Incorrect Correct answer

2700N/m

Correct Incorrect Correct answer

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

The friction force between tires and the road

Correct Incorrect Correct answer

Total weight of car

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The normal force of the road on the car

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None of them

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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?

9m

Correct Incorrect Correct answer

4.25m

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18m

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2.125m

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

magnet

Correct Incorrect Correct answer

two brushes

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Commutator

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two slip rings

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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 ]

‌F₂

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‌F₁

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‌F₃

Correct Incorrect Correct answer

هەرسێ هێزەکە هەمان زەبر پەیدا دەکەن

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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?

0dB

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30dB

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40dB

Correct Incorrect Correct answer

70dB

Correct Incorrect Correct answer

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?

0

Correct Incorrect Correct answer

10Ω

Correct Incorrect Correct answer

20Ω

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40Ω

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(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

half

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twice

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four times

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three times

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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?

q1 , q4

Correct Incorrect Correct answer

q4 , q2

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q3 , q1

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q3 , q2

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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?

‌7.5×10^-7m

Correct Incorrect Correct answer

‌3.52×10^-7m

Correct Incorrect Correct answer

‌6.3×10^-7m

Correct Incorrect Correct answer

‌5.66×10^-9m

Correct Incorrect Correct answer

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.

5m/s

Correct Incorrect Correct answer

3.5m/s

Correct Incorrect Correct answer

1.57m/s

Correct Incorrect Correct answer

7m/s

Correct Incorrect Correct answer

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]

10A

Correct Incorrect Correct answer

20A

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50A

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30A

Correct Incorrect Correct answer

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

θ would decrease because λ is longer in water compared to the air

Correct Incorrect Correct answer

θ would increase because λ is shorter in water compared to the air

Correct Incorrect Correct answer

θ would increase because λ is longer in water compared to the air

Correct Incorrect Correct answer

θ would decrease because λ is shorter in water compared to the air

Correct Incorrect Correct answer

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