پرسیاری وزاری فیزیا 2022-2023 خولی دووەم ، خوێندنی ئینگلیزی

A wave whose particles vibrate perpendicular to the direction of the wave is traveling

transverse wave

Correct Incorrect Correct answer

sound wave

Correct Incorrect Correct answer

longitudinal wave

Correct Incorrect Correct answer

(B and C) are correct

Correct Incorrect Correct answer

. In which situation, the direction of the magnetic force on a proton moves in a magnetic field is out of the page?

Correct Incorrect Correct answer

(In the photoelectric effect, if the frequency of incident light is increased with same intensity) Which of the following is true?

The speed of emitted electrons increases

Correct Incorrect Correct answer

The kinetic energy of ejected electrons increases

Correct Incorrect Correct answer

The number of emitted electrons does not change

Correct Incorrect Correct answer

All answers are correct

Correct Incorrect Correct answer

Identify which, conditions of equilibrium hold for (a bicycle parked against a curb)?

Only translational equilibrium.

Correct Incorrect Correct answer

Only rotational equilibrium

Correct Incorrect Correct answer

Both rotational and translational equilibrium.

Correct Incorrect Correct answer

neither translational rotational nor rotational equilibrium

Correct Incorrect Correct answer

Which of the following represents the first three harmonics in a pipe closed at one end?

(150Hz) , (100Hz) , (50Hz)

Correct Incorrect Correct answer

(250Hz), (150Hz) , (50Hz)

Correct Incorrect Correct answer

(200Hz) , (100Hz) , (50Hz)

Correct Incorrect Correct answer

(450Hz) , (150Hz) , (50Hz)

Correct Incorrect Correct answer

A simple pendulum can be used as an altimeter on a plane. What will happened as the plane rises from the ground to its final cruising altitude of 10⁴ m?

Its period will increase

Correct Incorrect Correct answer

Its frequency will increase

Correct Incorrect Correct answer

Its frequency will decrease

Correct Incorrect Correct answer

(A and C) are correct

Correct Incorrect Correct answer

At Which of the seven positions indicated in figure should
the supporting pivot be located to produce a net negative torque?

f , c

Correct Incorrect Correct answer

f

Correct Incorrect Correct answer

b

Correct Incorrect Correct answer

a

Correct Incorrect Correct answer

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

0dB

Correct Incorrect Correct answer

60dB

Correct Incorrect Correct answer

120dB

Correct Incorrect Correct answer

40dB

Correct Incorrect Correct answer

Which of the following summarizes Thomson’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 uniformly solid cylinders of equal radii roll down an incline without slipping. The first cylinder has three times
the mass of the second cylinder. The torque was exerted on the first cylinder is ………. torque exerted on the
second cylinder?

twice

Correct Incorrect Correct answer

three times‎

Correct Incorrect Correct answer

four times

Correct Incorrect Correct answer

five times

Correct Incorrect Correct answer

A toaster is plugged into a source of alternating emf with an rms value of 110 V. The heating element is designed to convey a current with a maximum value of 10.5 A, The resistance of the heating element?

1.78Ω

Correct Incorrect Correct answer

7.42Ω

Correct Incorrect Correct answer

0.707Ω

Correct Incorrect Correct answer

14.8Ω

Correct Incorrect Correct answer

In the region of which of following waves are (Masers) working?

Microwave

Correct Incorrect Correct answer

X-ray

Correct Incorrect Correct answer

Ultraviolet wave

Correct Incorrect Correct answer

Gamma ray

Correct Incorrect Correct answer

The unit of angular momentum is

$\frac{kg\cdot m^2}s$

Correct Incorrect Correct answer

$\frac{kg^2\cdot m^2}{s^2}$

Correct Incorrect Correct answer

$\frac{kg\cdot m^2}{s^2}$

Correct Incorrect Correct answer

$\frac{kg^2\cdot m^2}s$

Correct Incorrect Correct answer

. Two currents run in opposite direction in two parallel wires A and B at a distance of 1m Apart. if the current I_A is a third of I_B

($I_A=\frac13I_B$)

determine the position of the point along the line normal to the wires where the total magnetic field is zero?

1 m away from wire A

Correct Incorrect Correct answer

0.5 m away from wire A‏

Correct Incorrect Correct answer

0.75 m away from wire A‏

Correct Incorrect Correct answer

0.05 m away from wire A

Correct Incorrect Correct answer

According to ………… principle, any points on the wave front of light can be treated as a new point source of light to produce a new wave

Oersted’s

Correct Incorrect Correct answer

Bohr’s

Correct Incorrect Correct answer

Huygens’s

Correct Incorrect Correct answer

Planck’s

Correct Incorrect Correct answer

Which of the following must be true for two waves with identical amplitudes and wavelengths to undergo complete destructive interference?

The waves must be in phase at all times

Correct Incorrect Correct answer

The waves must be 90 out of phase at all times

Correct Incorrect Correct answer

The waves must be 180 out of phase at all times

Correct Incorrect Correct answer

The waves must be 270 out of phase at all times

Correct Incorrect Correct answer

A solenoid of length 50 cm has 2000 turns. Calculate the magnitude of the magnetic field in the middle of the
solenoid when a current of 10 A passes through its turns : μ_o=4πx10^-7T.m/A

‌5×10^-4T

Correct Incorrect Correct answer

‌5×10^-3T

Correct Incorrect Correct answer

‌5×10^-2T

Correct Incorrect Correct answer

‌5×10^-1T

Correct Incorrect Correct answer

What is the magnitude of the magnetic force (F_magnetic) on the electron, when moving perpendicular into the
magnetic field (𝐵⃗ )?

$qvB$

Correct Incorrect Correct answer

$-BLv$

Correct Incorrect Correct answer

$BLv$

Correct Incorrect Correct answer

$\frac q{vB}$

Correct Incorrect Correct answer

A disk rolls along a horizontal surface at a constant linear speed without slipping .What is the ratio of its
translational kinetic energy to total kinetic energy (KE_{𝐭𝐫𝐚𝐧𝐬𝐥𝐚𝐭𝐢𝐨𝐧𝐚}/KE_total)

1/2

Correct Incorrect Correct answer

2/7

Correct Incorrect Correct answer

2/3

Correct Incorrect Correct answer

1/3

Correct Incorrect Correct answer

A generator coil has 25 turns of wire and a cross-sectional area of 36 cm² . The maximum emf developed in the
generator is 2.8 V at 60 Hz. what is the strength of the magnetic field in which the coil rotates?

‌8.25×10^-3T

Correct Incorrect Correct answer

‌8.25×10^-2T

Correct Incorrect Correct answer

‌8.25×10^-5T

Correct Incorrect Correct answer

‌8.25×10^-4T

Correct Incorrect Correct answer

A double slit interference experiment is performed using blue light from a hydrogen discharge tube (λ=486 nm) The fifth order bright fringe in the interference pattern is 0.578^ofrom the central maximum. How far apart are the two slits separated?

‌7.5×10^-4m

Correct Incorrect Correct answer

‌2.41×10^-4m

Correct Incorrect Correct answer

‌6.3×10^-6m

Correct Incorrect Correct answer

‌5.66×10^-4m

Correct Incorrect Correct answer

If the pendulume number (2) is set inmotion. Which
pendulum will oscillate with larger amplitude?

1

Correct Incorrect Correct answer

3

Correct Incorrect Correct answer

4

Correct Incorrect Correct answer

1 , 3

Correct Incorrect Correct answer

According to right hand rule, which of following figures correctly describe the direction of current and magnetic field of solenoid?

Correct Incorrect Correct answer

A car of mass 1000 kg moves in circular truck at constant speed of 25 m/s if the circumference of track is 6280 m, calculate the force that maintains circular motion of car?

1000N

Correct Incorrect Correct answer

625N

Correct Incorrect Correct answer

2140N

Correct Incorrect Correct answer

4280N

Correct Incorrect Correct answer

How does the restoring force acting on a pendulum bob changes as the bob swings toward the equilibrium
position? How do the bob’s acceleration (along the direction of motion) and velocity change?

restoring force decreases, acceleration decreases, velocity increases

Correct Incorrect Correct answer

restoring force increases, acceleration decreases, velocity increases

Correct Incorrect Correct answer

restoring force decreases, acceleration increases, velocity increases

Correct Incorrect Correct answer

restoring force decreases, acceleration decreases, velocity decreases

Correct Incorrect Correct answer

Eddy currents are used:

In furnaces

Correct Incorrect Correct answer

In car brake systems

Correct Incorrect Correct answer

In detecting metals in airports underground

Correct Incorrect Correct answer

In all of them

Correct Incorrect Correct answer

The electrical energy is transferred from power plants to houses and factories

By high potential difference and low current.

Correct Incorrect Correct answer

By low potential difference and high current.

Correct Incorrect Correct answer

By high potential difference and high current.

Correct Incorrect Correct answer

By low potential difference and low current.

Correct Incorrect Correct answer

The wheel on an upside-down bicycle moves through 10 rad in 2 s. What is the wheel’s angular acceleration if its
final angular speed is 8 rad/s?

$rad/s^2$3.5

Correct Incorrect Correct answer

$rad/s^2$3

Correct Incorrect Correct answer

$rad/s^2$6.3

Correct Incorrect Correct answer

$rad/s^2$8

Correct Incorrect Correct answer

Which solid has a valence band that overlaps the conduction band?

Insulator

Correct Incorrect Correct answer

Semiconductor

Correct Incorrect Correct answer

Conductor

Correct Incorrect Correct answer

All answers are correct

Correct Incorrect Correct answer

In the electrical circuit is in the adjacent figure
Calculate the Phase difference angle between
the total current and the total potential difference?

13.5

Correct Incorrect Correct answer

35

Correct Incorrect Correct answer

46

Correct Incorrect Correct answer

90

Correct Incorrect Correct answer

The electrical energy is transferred from power plants to houses and factories

1m

Correct Incorrect Correct answer

075m

Correct Incorrect Correct answer

0.5m

Correct Incorrect Correct answer

0.25m

Correct Incorrect Correct answer

How many radians are equal (128^o)?

1.3rad

Correct Incorrect Correct answer

2.23rad

Correct Incorrect Correct answer

3.3rad

Correct Incorrect Correct answer

3.2rad

Correct Incorrect Correct answer

Which of electromagnetic waves is used easily to measure Compton shift?

Visible light

Correct Incorrect Correct answer

Microwaves

Correct Incorrect Correct answer

Infrared rays

Correct Incorrect Correct answer

X-ray

Correct Incorrect Correct answer

A source of frequency

$\frac{100}\pi Hz$

and its effective potential difference is 200 V is connected across a capacitor, if the effective current of the circuit is 10 A, Calculate the maximum charge accumulated across the capacitor?

‌5.65×10^-2C

Correct Incorrect Correct answer

‌5×10^-2C

Correct Incorrect Correct answer

‌7.07×10^-2C

Correct Incorrect Correct answer

‌14.1×10^-2C

Correct Incorrect Correct answer

If the expressions of the instantaneous current and instantaneous potential difference across a pure self-nductance given by

$I_L=2\sqrt2\sin\left(100\pi t\right)$

$V_L=125.6\sin\left(100\pi t+\frac\pi2\right)$‏

calculate the coefficient of self induction of coil?

0.2H

Correct Incorrect Correct answer

0.5H

Correct Incorrect Correct answer

0.75H

Correct Incorrect Correct answer

0.62H

Correct Incorrect Correct answer

Which equation is correct to calculate centripetal acceleration?

‌a_c=rω²

Correct Incorrect Correct answer

‌a_c=rω

Correct Incorrect Correct answer

‌a_c=r²ω

Correct Incorrect Correct answer

‌a_c=ω²/r

Correct Incorrect Correct answer

A simple pendulum of length 0.25 m and period of 1s what will be the period of this pendulum if its length is 1m at same place?

5s

Correct Incorrect Correct answer

4s

Correct Incorrect Correct answer

3s

Correct Incorrect Correct answer

2s

Correct Incorrect Correct answer

Commutator is not used in:

D.C generator

Correct Incorrect Correct answer

D.C motor

Correct Incorrect Correct answer

A.C generator

Correct Incorrect Correct answer

both (A and B) are correct

Correct Incorrect Correct answer

In figure (Two parallel wires, each carrying a direct current)
Determine the direction of movement of electrons in the wire (2)?

out of the page.

Correct Incorrect Correct answer

into the page.

Correct Incorrect Correct answer

down the page.

Correct Incorrect Correct answer

up the page

Correct Incorrect Correct answer

Two successive crests of a transverse wave are 2.4 m apart. Eight crests pass a give point in 12 s. What is the
wave speed?

0.8m/s

Correct Incorrect Correct answer

1.6m/s

Correct Incorrect Correct answer

3.2m/s

Correct Incorrect Correct answer

0.4m/s

Correct Incorrect Correct answer

A potential difference of 0.75 V is needed to provide a large current for arc welding. If the potential difference
across the primary of a step-down transformer is 117 V, what is the ratio of the number of turns of wire on the
primary to the number of turns on the secondary?

$\frac1{156}$

Correct Incorrect Correct answer

$\frac{156}1$

Correct Incorrect Correct answer

$\frac{171}1$

Correct Incorrect Correct answer

$\frac1{171}$

Correct Incorrect Correct answer

(A girl at a state fair swings a ball in a vertical circle at the end of a string) What is the tension force applied by the string at the bottom of the ball’s path?

equals the weight of the ball

Correct Incorrect Correct answer

equals (weight of the ball + centripetal force that maintains circular motion)

Correct Incorrect Correct answer

smaller the weight of the ball

Correct Incorrect Correct answer

equals (weight of the ball – centripetal force that maintains circular motion)

Correct Incorrect Correct answer

Which of the following wave lengths will not produce standing waves on a string that is 3.5 m, long?

1.75m

Correct Incorrect Correct answer

3.5m

Correct Incorrect Correct answer

7m

Correct Incorrect Correct answer

5m

Correct Incorrect Correct answer

Which of the following frequencies the emission of electrons from a meatal surface of a work function is (2.3 eV)
occurs when light shines on the surface of the meatal?

h=6.63×10^-34j.s

‌5.8×10¹⁴Hz

Correct Incorrect Correct answer

‌6.8×10¹⁴Hz

Correct Incorrect Correct answer

‌5.8×10¹³Hz

Correct Incorrect Correct answer

(A and B) are true

Correct Incorrect Correct answer

(An object moves in circle at constant speed) Which of the following is not true for object?

centripetal acceleration is directed toward the center of the circle.

Correct Incorrect Correct answer

tangential acceleration is zero.

Correct Incorrect Correct answer

centripetal force acts on it

Correct Incorrect Correct answer

The object in equilibrium

Correct Incorrect Correct answer

What is another word for “quantum of light”?

Blackbody radiation

Correct Incorrect Correct answer

energy level

Correct Incorrect Correct answer

photon

Correct Incorrect Correct answer

frequency

Correct Incorrect Correct answer

In which of the following cases super conductor materials couldn’t be used:

as heating device and ovens

Correct Incorrect Correct answer

a transferring energy with no losses

Correct Incorrect Correct answer

as storage of electrical energy

Correct Incorrect Correct answer

magnetic levitation

Correct Incorrect Correct answer

A 10 kg mass is attached to a cord that is wrapped around a wheel with a radius
of 10 cm, as shown in Figure. The acceleration of the mass down the frictionless
incline is measured to be 2 m/s²
. Assuming the axle of the wheel to be frictionless,
determine the moment of inertia of the wheel?

‌0.19kg.m²

Correct Incorrect Correct answer

‌0.24kg.m²

Correct Incorrect Correct answer

‌40kg.m²

Correct Incorrect Correct answer

‌0.05kg.m²

Correct Incorrect Correct answer

A bat flies towards a fixed wall and sends an ultrasonic wave of frequency (𝑓), Which of the following equations is
correct to calculate the apparent frequency (𝑓́) of this wave when it strikes the wal

$=f\frac v{v-v_s}$’f

Correct Incorrect Correct answer

$=f\frac v{v+v_s}$’f

Correct Incorrect Correct answer

$=f\frac{v+v_0}V$’f

Correct Incorrect Correct answer

$=f\frac{v-v_0}V$’f

Correct Incorrect Correct answer

In the transistor outer regions are called the (emitter and collector) and the narrow central region is called the base , which of the following is true

The emitter is more heavily doped than the base.

Correct Incorrect Correct answer

The (emitter – base) junction is forward biased

Correct Incorrect Correct answer

The (base – collector) junction is reverse biased.

Correct Incorrect Correct answer

All answers are correct.

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