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physics T3 EOT3

Total questions: 40

Worksheet time: 21mins

Name
Class
Date
1.

A 0.30-m long straight wire moves at a constant speed of 9.5 m/s perpendicular to a magnetic field of strength 0.083 T. What EMF is induced in the wire?

a)

0.48 V

b)

1.2 V

c)

2.6 V

d)

0.24 V

2.

electromotive force is -------- of ----------produce electric field and therefore a ------------------across the length of the wire

a)

separation-charges -potential difference

b)

combining -ambers -potential difference

c)

separation-charges -magnetic field

d)

lose -charges -potential difference

3.

what is the unit of electromotive force ?

a)

volt =J\C

b)

N

c)

A

d)

C

4.

In the figure , what is the direction of the emf and induced current ?

a)

both are up

b)

emf--> down

induced current down

c)

emf--> left

induced current down

d)

both are down

5.

A straight wire segment in a circuit is 30.0 m long and moves at 2.0 m/s perpendicular to a magnetic field - The total resistance of the circuit is 5.0

Ω

.

What is the current?

a)

0.83A

b)

1.2 A

c)

30A

d)

360A

6.

ou want to generate an EMF of 2.6 V by moving a wire at 3.0 m/s through a 0.040-T magnetic field. If you keep the wire perpendicular to the magnetic field, what length of wire should you use?

a)

22 m

b)

0.035 m

c)

0.046 m

d)

11 m

7.

A generator develops a maximum potential difference of 170 V.

a.

What is the effective potential difference?



(a)  

8.

If the average power used over time by an electric light is 75 W, what is the peak power?

a)

150w

b)

37.5w

c)

22.5w

d)

53.033w

9.

the main energy transformation that occurs in a generator?

a)

mechanical energy to electrical energy

b)

electrical energy to mechanical energy

c)

sound energy to electrical energy

d)

kinetic energy to electrical energy

10.

which table represents the correct steps of working of the microphone ?

a)

green table

b)

black table

c)

yellow table

d)

orange table

11.

which number represents the coil of the microphone ?

a)

1

b)

2

c)

3

d)

4

12.

choose the correct ordered components depend of the figure

a)

1-mechanical input

2-axle

3-electric output

4-brushes

5-slip rings

6-armature (wire loop)

b)

1-axle

2-mechanical input

3-electric output

4-brushes

5-slip rings

6-armature (wire loop)

c)

1-armature (wire loop)

2-mechanical input

3-electric output

4-brushes

5-slip rings

6-axle

d)

1-mechanical input

2-axle

3-electric output

4-brushes

5-

6-slip rings armature (wire loop)

13.

. A step-down transformer has 7500 turns on its primary and 125 turns on its secondary. The voltage across the primary is 7200 V.

What is the voltage across the secondary?

a)

𝟏𝟐𝟎V

b)

150V

c)

23V

d)

145V

14.

If the  secondary  potential difference is larger than the primary potential difference , then the transformer is ?

a)

Step-up transformers

b)

Step-down transformers

15.

يمتاز محول 150 وات بفرق جهد دخل 9فولت و تيار خرج 5 امبير . ما نسبة الجهد الخارج إلى الجهد الداخل ؟

a)

ثلاثة الى واحد

b)

ثلاثة إلى عشرة

c)

عشرة إلى ثلاثة

d)

واحد الى ثلاثة

16.

Lenz law says that the magnetic filed produced by an induced current is in the direction that is ................ to the change in the original filed

a)

opposite

b)

same the the direction

c)

left

d)

right

17.

حسب قانون لنز يكون اتجاه التيار التأثيري بحيث يولد مجاالً مغناطيسياً :

a)

متعامد على المجال األصلي

b)

في عكس اتجاه المجال األصلي

c)

يقاوم التغير المسبب له

d)

في نفس اتجاه المجال األصلي

18.

What is the direction of the induced magnetic field?

a)

left

b)

right

c)

up

d)

down

19.

what is the effective current in this AC generator ?

a)

2.8A

b)

5.7A

c)

4A

d)

2A

20.

whar is the frequency of an electromagnetic wave that has wavelength of 2.2×10−2 m2.2\times10^{-2\ }m  ?

(a)  

21.

select the primary characteristics of electromagnetic waves

a)

its a transverse waves

b)

its a longitudinal wave

c)

can travel in vacuum at 3.0⋅108 3.0\cdot10^8\  m\s

d)

can reflect , deflects ,diffract

e)

has a frequency , and wavelength

22.

(the range of frequencies that make up the continuum of electromagnetic waves)

this definition is refers to ?

a)

electromagnetic wave

b)

electromagnetic spectrum

c)

electromagnetic radiation

d)

wavelength

23.

what is the electromagnetic radiation ?

a)

energy that is carried , or radiated by an electromagnetic waves

b)

amplitudes that is carried , or radiated by an electromagnetic waves

c)

frequencies that is carried , or radiated by an electromagnetic waves

d)

its a couple of energy

24.

the energy carried by an electromagnetic waves is propotional to ?

a)

the square root of the amplitude of the electric field

b)

area the wave crosses

c)

the square root of the amplitude of the magnetic field

d)

the half of the amplitude of the electric field

25.

one application of radio waves is

a)

broadcast information

b)

FM radio ,TV,GPS

c)

cooking food

d)

•infrared cameras and night-vision goggles

•heating buildings

26.

one application of microwaves is

a)

broadcast information

b)

FM radio ,TV,GPS

c)

cooking food

d)

•infrared cameras and night-vision goggles

•heating buildings

27.

one application of infrared waves is

a)

broadcast information

b)

FM radio ,TV,GPS

c)

cooking food

d)

•infrared cameras and night-vision goggles

•heating buildings

28.

one application of ultraviolet waves is

a)

•ionizing molecules and atoms

b)

•sterilizing instruments

c)

•causing chemical reactions

d)

•infrared cameras and night-vision goggles

•heating buildings

e)

•broadcasting information

29.

one application of Gamma rays waves

a)

detecting dangerous substances in shipping containers

b)

treat cancer by destroying cells

c)

•infrared cameras and night-vision goggles

•heating buildings

d)

•broadcasting information

30.

when the antenna is more efficient ? so mere potential difference across

a)

when an antenna is one-half the length of the waves it is designed to detect

b)

when an antenna is one-forth the length of the waves it is designed to detect

c)

when an antenna is one-fifth the length of the waves it is designed to detect

d)

when an antenna is one-tenth the length of the waves it is designed to detect

31.

which type of electromagnetic has a longer wavelength ?

a)

radio wave

b)

infrared wave

c)

microwave

d)

X-ray

32.

which types of electromagnetic wave has a grater frequency

a)

Gamma ray

b)

radio wave

c)

microwave

d)

infrared wave

33.

which kind of electromagnetic wave is the size of proton ?

a)

Gamma rays

b)

radio wave

c)

microwave

d)

infrared

34.

what is the wavelength of green light has a frequency of 5.70⋅1014 Hz ?5.70\cdot10^{14\ }Hz\ ?  

a)

5.26×10−7 m5.26\times10^{-7\ }m  

b)

1.70×10231.70\times10^{23}  m

c)

8.55×1022 m8.55\times10^{22\ }m  

d)

undefined

35.

coupled , oscilating electric and magnetic filed that propagate through space

a)

radio wave

b)

X-ray

c)

electromagnetic wave

d)

kinetic energy

36.

what capture electromagnetic waves, converting the waves’ oscillating electric fields back to potential differences ?

a)

antenna

b)

receiver

c)

FM wave

d)

frequency

37.

A wave’s electric field accelerates electrons in the metal of an antenna, resulting in a ---------------across the antenna’s terminals that oscillates at the frequency of the wave.

a)

potential difference

b)

wavelength

c)

frequency

d)

velocity

38.

The acceleration is largest when the antenna is ................ to the direction of the wave’s electric field.

a)

parallel

b)

perpendicular

c)

half of

d)

opposite

39.

we call this process ?

a)

receiving electromagnetic wave

b)

clearing electromagnetic wave

c)

playing electromagnetic wave

40.

a device that converts oscillating potential differences in an antenna to sound, pictures, or data

a)

antenna

b)

transmitter

c)

receiver

d)

dielectric

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