فیزیا 2021-2020 خولی یەکەم خوێندنی ئینگلیزی

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 Doppler effect occurs in all but which of the following situations

A source of sound moves toward a listener

Correct Incorrect Correct answer

A listener moves toward a source of sound

Correct Incorrect Correct answer

A listener and a source of the sound remain at rest with respect to each other

Correct Incorrect Correct answer

A listener and a source of the sound move toward or away from each other

Correct Incorrect Correct answer

If an object is in the state of rotational equilibrium which of the following is true

0=α

0=t∑

Correct Incorrect Correct answer

0=α

Correct Incorrect Correct answer

its angular speed constant

Correct Incorrect Correct answer

All of the them are correct interpretations

Correct Incorrect Correct answer

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

speed

Correct Incorrect Correct answer

frequency

Correct Incorrect Correct answer

wavelength

Correct Incorrect Correct answer

amplitude

Correct Incorrect Correct answer

A straight segment of wire has 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

Correct Incorrect Correct answer

75N

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 centre is 1 m/s ( I = 1/2 m/r²)

0.375j

Correct Incorrect Correct answer

3.75j

Correct Incorrect Correct answer

375j

Correct Incorrect Correct answer

3.75×10³

Correct Incorrect Correct answer

Which of the following is the component of the magnetic field perpendicular to the plane of the loop.
θ is the angle between the direction magnetic field and the normal to the plane of the loop

B sinθ

Correct Incorrect Correct answer

B cosθ

Correct Incorrect Correct answer

B cosθ tanθ

Correct Incorrect Correct answer

AB tanθ

Correct Incorrect Correct answer

A uniform disk of mass 5 kg and radius 0.1 m rotating at angular speed of 20 rad/s calculate its angular momentum of the disk

0.2kg(m²/s)

Correct Incorrect Correct answer

0.3kg(m²/s)

Correct Incorrect Correct answer

1kg(m²/s)

Correct Incorrect Correct answer

0.5kg(m²/s)

Correct Incorrect Correct answer

What kind of wave does this graph represent?

Transverse wave

Correct Incorrect Correct answer

longitudinal wave

Correct Incorrect Correct answer

electromagnetic wave

Correct Incorrect Correct answer

radio wave

Correct Incorrect Correct answer

A parked ambulance emits a sound of frequency 1200 Hz. What frequency is detected by an observer inside another car moving with a velocity of 72 km/h. when he move towards the ambulance. (Speed of sound in air is 340 m/s)

1000Hz

Correct Incorrect Correct answer

1129.4Hz

Correct Incorrect Correct answer

1270.6Hz

Correct Incorrect Correct answer

1700Hz

Correct Incorrect Correct answer

A baseball coach shouts loudly at an umpire standing 5 m away. If the sound power produced by the
coach is 3.14 × 10^-3 W, what is the decibel level of the sound when it reaches the umpire

0dB

Correct Incorrect Correct answer

30dB

Correct Incorrect Correct answer

40dB

Correct Incorrect Correct answer

70dB

Correct Incorrect Correct answer

Which of the following sound waves travel faster in the air

audible waves

Correct Incorrect Correct answer

infrasonic waves

Correct Incorrect Correct answer

ultrasonic waves

Correct Incorrect Correct answer

All sound waves travel at the same speed in air

Correct Incorrect Correct answer

A pipe that is open at both ends has a fundamental frequency of 456 Hz when the speed of sound in air is

331 m/s. What is the fundamental frequency of this pipe when the speed of sound in air is increased to 367 m/s as a result of increasing the temperature of the air in the pipe

250Hz

Correct Incorrect Correct answer

507Hz

Correct Incorrect Correct answer

750Hz

Correct Incorrect Correct answer

1000Hz

Correct Incorrect Correct answer

The magnetic field of solenoid depends on which of the following factors

number of turns per unit length

Correct Incorrect Correct answer

amount a current

Correct Incorrect Correct answer

magnetic permeability of the medium (µ)

Correct Incorrect Correct answer

All the answers are correct

Correct Incorrect Correct answer

Which type of interference will happen When two, pulses meet, (as shown in the figure)

destructive interference

Correct Incorrect Correct answer

constructive interference

Correct Incorrect Correct answer

complete destructive interference

Correct Incorrect Correct answer

no interference occur

Correct Incorrect Correct answer

What happens to the wavelength of a wave on a string when the frequency is doubled? What happens to the speed of the wave

The wavelength is halved and the speed doubles

Correct Incorrect Correct answer

The wavelength doubles and the speed double too

Correct Incorrect Correct answer

The wavelength is halved and the wave speed remains the same

Correct Incorrect Correct answer

The wavelength is doubled and the wave speed remains the same

Correct Incorrect Correct answer

A pair of adjacent coils has a mutual inductance of 1.06 H. Determine the average emf induced in the
secondary circuit when the current in the primary circuit changes from 0 A to 9.5 A in a time
interval of 0.0336s

117V

Correct Incorrect Correct answer

245V

Correct Incorrect Correct answer

-300V

Correct Incorrect Correct answer

300V

Correct Incorrect Correct answer

The combination of an applied force and a frictional force produce a constant torque of 36 N.m on a wheel rotating about a fixed axis. The applied force acts for 6 s , during this time the angular speed of the wheel increases from 0 to 12 rad/s. Then the applied force is removed, and the wheel comes to rest in 65 s, what is the frictional torque

– 11 N.m

Correct Incorrect Correct answer

– 26.5 N.m

Correct Incorrect Correct answer

– 33 N.m

Correct Incorrect Correct answer

– 3.3 N.m

Correct Incorrect Correct answer

The unknown quantity in the corresponding table is equal

-0.25rad/s²

Correct Incorrect Correct answer

-0.5rad/s²

Correct Incorrect Correct answer

-1.07ad/s²

Correct Incorrect Correct answer

-2rad/s²

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 2π × 10⁻⁵T ,[µₒ=4π × 10^-7 T.m/A]

10A

Correct Incorrect Correct answer

20A

Correct Incorrect Correct answer

25A

Correct Incorrect Correct answer

30A

Correct Incorrect Correct answer

If we increase the length of the pedal arm then the amount of torque applied to moving the front wheel of a
bicycle will

Increases

Correct Incorrect Correct answer

Decreases

Correct Incorrect Correct answer

Reduce to half

Correct Incorrect Correct answer

Does not change

Correct Incorrect Correct answer

A uniform 4.14 m long horizontal beam (b) that weighs 392.9 N is attached to a wall by a pin connection that allows the beam to rotate. Its far end is supported by a cable that makes an angle of 53° with thehorizontal, and a 560 N person (P)is standing 1.5 m from the pin,
Find the tension force (FT) ,of the cable ( If beam is in complete equilibrium) as shown in figure

500N

Correct Incorrect Correct answer

400N

Correct Incorrect Correct answer

663N

Correct Incorrect Correct answer

952.9N

Correct Incorrect Correct answer

An air solenoid of length l0 cm, cross -sectional area 24.88 cm², and 400 turns. Calculate the coefficient of self induction of solenoid [µₒ=4π × 10^-7 T.m/A]

2×10^-3H

Correct Incorrect Correct answer

5×10^-3H

Correct Incorrect Correct answer

3×10^-5H

Correct Incorrect Correct answer

3×10^-4H

Correct Incorrect Correct answer

The machine that converts mechanical energy into electric energy is called

generator

Correct Incorrect Correct answer

motor

Correct Incorrect Correct answer

ammeter

Correct Incorrect Correct answer

microphone

Correct Incorrect Correct answer

Determine the change in gravitational force between two masses if the distance between two
masses is doubled

becomes four times

Correct Incorrect Correct answer

becomes three times

Correct Incorrect Correct answer

1/4 becomes

Correct Incorrect Correct answer

does not changing

Correct Incorrect Correct answer

What is the restoring force of the (mass-spring) system

Elastic force

Correct Incorrect Correct answer

weight

Correct Incorrect Correct answer

frictional force

Correct Incorrect Correct answer

both (B) and(C)are correct

Correct Incorrect Correct answer

In the figure use the movement of the positively charged particle and the direction of the magnetic force acting on it to find the direction of the magnetic field

up the page

Correct Incorrect Correct answer

to the right of page

Correct Incorrect Correct answer

out of the page

Correct Incorrect Correct answer

down the page

Correct Incorrect Correct answer

Henry (H) =……….

Ω.m

Correct Incorrect Correct answer

Wb.m²

Correct Incorrect Correct answer

Wb/A

Correct Incorrect Correct answer

N.m

Correct Incorrect Correct answer

A point on rim of CD in a computer has tangential speed of 1.8 m/s, If radius of CD is 0.06 m what is the tangential speed of a point on this CD that is 0.03 m from axis of rotation

30m/s

Correct Incorrect Correct answer

0.3m/s

Correct Incorrect Correct answer

0.9m/s

Correct Incorrect Correct answer

3.6m/s

Correct Incorrect Correct answer

Which of the following features of a given pendulum changes when the pendulum is moved from Earth’s surface ? to the Moon

Its mass

Correct Incorrect Correct answer

Its length

Correct Incorrect Correct answer

The equilibrium position

Correct Incorrect Correct answer

The restoring force

Correct Incorrect Correct answer

. An alpha particle (q=3.2 × 10^-19 C) moves at a speed of 2.5×106m/s perpendicular to a magnetic field of strength 2 ×10^-4 T. What is the magnitude of the magnetic force on the particle

1.6×10^-16N

Correct Incorrect Correct answer

– 1.6×10^-16N

Correct Incorrect Correct answer

4×10^-9N

Correct Incorrect Correct answer

zero

Correct Incorrect Correct answer

If the motor’s coil turns faster then

The back emf increases

Correct Incorrect Correct answer

The back emf decreases

Correct Incorrect Correct answer

current of the coil decreases

Correct Incorrect Correct answer

both (A) and(C)are correct

Correct Incorrect Correct answer

?What is the length of a simple pendulum, its frequency is 0.525 Hz ,If a_g=9.81 m/s²

0.9m

Correct Incorrect Correct answer

4.5m

Correct Incorrect Correct answer

1.25m

Correct Incorrect Correct answer

3.25m

Correct Incorrect Correct answer

A mass attached to a spring vibrates back and forth, about equilibrium position, at maximum displacement, the restoring force and the

speed reaches a maximum

Correct Incorrect Correct answer

speed reaches zero

Correct Incorrect Correct answer

acceleration reaches a maximum

Correct Incorrect Correct answer

acceleration reaches zero

Correct Incorrect Correct answer

The rate at which a body rotates about an axis

angular displacement (∆𝛉)

Correct Incorrect Correct answer

tangential acceleration (𝐚𝐭)

Correct Incorrect Correct answer

angular speed (𝛚)

Correct Incorrect Correct answer

angular acceleration(𝛂)

Correct Incorrect Correct answer

All points on a disk rotating around a fixed axis, have the same

tangential speed

Correct Incorrect Correct answer

angular speed

Correct Incorrect Correct answer

tangential acceleration

Correct Incorrect Correct answer

both (A) and(C)are correct

Correct Incorrect Correct answer

If a pendulum clock is running slow, what must be done to correct the time

make the pendulum shorter

Correct Incorrect Correct answer

make the pendulum taller

Correct Incorrect Correct answer

increasing the mass

Correct Incorrect Correct answer

increasing the amplitude

Correct Incorrect Correct answer

The unit of magnetic field B is

T Tesla

Correct Incorrect Correct answer

N/A.m

Correct Incorrect Correct answer

wb/m²

Correct Incorrect Correct answer

All the answers are correct

Correct Incorrect Correct answer

When a wheel is rotating through an angle of 35°, a point on the circumference travels through an arc length of 2.5 m. What is the radius of the wheel

1.4m

Correct Incorrect Correct answer

4.1m

Correct Incorrect Correct answer

36m

Correct Incorrect Correct answer

22.5m

Correct Incorrect Correct answer

A 0.77 kg mass attached to a vertical spring stretches the spring 0.3 m. What is the spring constant

0.25N/m

Correct Incorrect Correct answer

2.5N/m

Correct Incorrect Correct answer

20N/m

Correct Incorrect Correct answer

25N/m

Correct Incorrect Correct answer

A solid ball with a mass of 4.1 kg and a radius of 0.05 m starts from rest at a height of 2 m and rolls down a 30o
slope. What is the translational speed of the ball when it leaves the incline

6.727m/s

Correct Incorrect Correct answer

4.245m/s

Correct Incorrect Correct answer

5.29m/s

Correct Incorrect Correct answer

24m/s

Correct Incorrect Correct answer

A bicyclist rides along a circular track. If the bicyclist travels around exactly half the track in 10 s, what is his average angular speed

0.314rad/s

Correct Incorrect Correct answer

2.23rad/s

Correct Incorrect Correct answer

0.63rad/s

Correct Incorrect Correct answer

31rad/s

Correct Incorrect Correct answer

Which of the following is a correct interpretation of the expression

a_g= g = G(m_e/r²)

Gravitational field strength changes with an object’s distance from Earth

Correct Incorrect Correct answer

Free- fall acceleration changes with an object’s distance from Earth

Correct Incorrect Correct answer

Free- fall acceleration is independent of the falling object’s mass

Correct Incorrect Correct answer

All of the above are correct interpretations

Correct Incorrect Correct answer

Rapidly inserting the north pole of a bar magnet into a coil of wire connected to a galvanometer causes the needle of the galvanometer to deflect to the right, what must be done to the needle of the galvanometer to the left

pull the north pole of magnet out of the coil

Correct Incorrect Correct answer

let the magnet sit at rest in the coil

Correct Incorrect Correct answer

thrust the south pole of the magnet into the coil

Correct Incorrect Correct answer

both (A) and (C) are correc

Correct Incorrect Correct answer

If a spinning amusement-park ride has an angular speed of I.2 rad/s, what is the centripetal acceleration of a person standing 12 m from the Centre of the ride

17.28m/s²

Correct Incorrect Correct answer

1.728m/s²

Correct Incorrect Correct answer

172m/s²

Correct Incorrect Correct answer

1282m/s²

Correct Incorrect Correct answer

The angle between the direction of centripetal force F_c⃑⃑⃑ and the direction of centripetal acceleration a_c⃑⃑⃑ is equal to

0

Correct Incorrect Correct answer

45

Correct Incorrect Correct answer

90

Correct Incorrect Correct answer

180

Correct Incorrect Correct answer

At the time of producing standing wave in which of the following does number of antinodes is greater than
number of nodes

vibrating string

Correct Incorrect Correct answer

pipes open of both end

Correct Incorrect Correct answer

pipes closed at one end

Correct Incorrect Correct answer

All the answers are correct

Correct Incorrect Correct answer

? Which rotational quantity is equivalent to mass in transitional motion

torque(τ)

Correct Incorrect Correct answer

angular momentum(L)

Correct Incorrect Correct answer

moment of inertia(I)

Correct Incorrect Correct answer

force(F)

Correct Incorrect Correct answer

? What is the longest wave length of a standing wave of in pipe closed at one end, its length is L

λ₁=L

Correct Incorrect Correct answer

λ₁=2L

Correct Incorrect Correct answer

λ₁=3L

Correct Incorrect Correct answer

λ₁=4L

Correct Incorrect Correct answer

The galvanometer can be converted to a voltmeter by connecting a resistor of………. to the galvanometer

very high resistance in series

Correct Incorrect Correct answer

very high resistance in parallel

Correct Incorrect Correct answer

very low resistance in paralle

Correct Incorrect Correct answer

very low resistance in series

Correct Incorrect Correct answer

Quiz Summary

Information

Results

Results

Categories

1. Question

2. Question

3. Question

4. Question

5. Question

6. Question

7. Question

8. Question

9. Question

10. Question

11. Question

12. Question

13. Question

14. Question

15. Question

16. Question

17. Question

18. Question

19. Question

20. Question

21. Question

22. Question

23. Question

24. Question

25. Question

26. Question

27. Question

28. Question

29. Question

30. Question

31. Question

32. Question

33. Question

34. Question

35. Question

36. Question

37. Question

38. Question

39. Question

40. Question

41. Question

42. Question

43. Question

44. Question

45. Question

46. Question

47. Question

48. Question

49. Question

50. Question