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Question Bank No: 2

1. Television signal have frequency range

a)		200 - 400 MHz
b)		100 - 200 MHz
c)		50 - 100 MHz
d)		0 - 50 MHz

2. The distance upto which T.V signal can be received depends on

a)		radius of earth
b)		height of the antenna
c)		radius of the earth and height of antenna
d)		none of the above

3. Green house effect keeps the earth's surface

a)		cold at night
b)		warm at night
c)		dusty and cold
d)		misty at night

4. The TV transmission tower in Delhi has a height 240m. The distance up to which the broadcast can be received (taking the radius of the earth as ${6.4 \times 10}^{6}$ m) is

a)		100 km
b)		50 km
c)		55 km
d)		500 km

5. The minimum linear distance between such points having the same phase in any wave is called

a)		amplitude
b)		wavelength
c)		phase
d)		none

6. Electromagnetic waves ranging from $100^{\circ} A$ to ${4000 A}^{\circ}$ comes under

a)		x -rays
b)		ultraviolet ray
c)		visible region
d)		$δ$ -rays

7. Infrared spectrum lies between

a)		radio and microwave region
b)		visible and ultraviolet region
c)		micro wave and visible region
d)		ultraviolet and x-rays

8. Pick out the one which has extremely short wavelength much shorter than visible light and can be emitted by the nucleus of an atom

a)		u - v radiation
b)		$β$ - radiation
c)		$δ$ - radiation
d)		infrared radiation

9. The colour of light which travels with maximum speed in glass is

a)		blue
b)		green
c)		violet
d)		red

10. Which of the wave cannot be polarised

a)		radio waves
b)		x-rays
c)		$δ$ rays
d)		longitudinal waves in gas

11. Choose the wave relevant for telecommunication

a)		ultra violet
b)		micro wave
c)		infrared
d)		x -ray

12. The existence of electro magnetic wave was first experimentally demonstrated by

a)		Maxwell
b)		Faraday
c)		Hertz
d)		Tesla

13. An electric or magnetic field can not accelerate a

a)		electron
b)		neutron
c)		proton
d)		$α$ - particle

14. The frequency of radio waves corresponding to 10m wave length is

a)		${3 \times 10}^{7}$ Hz
b)		${3 \times 10}^{- 8}$ Hz
c)		${3 \times 10}^{9}$ Hz
d)		${3 \times 10}^{- 7}$ Hz

15. The electromagnetic waves travel with velocity

a)		equal to that of light
b)		equal to the velocity of sound
c)		less than the velocity of light
d)		greater than the velocity of light

16. If $\vec{E}$ and $\vec{B}$ represent electric and magnetic field vectors of electromagnetic wave, the direction of propagation of electromagnetic wave is that of

a)		$\vec{E}$
b)		$\vec{B}$
c)		$\vec{E} \times \vec{B}$
d)		$\vec{B} \times \vec{E}$

17. Which of the following is a wrong statement?

a)		Electromagnetic waves are produced by acelerating charges
b)		Electromagnetic waves are transverse in nature
c)		Electro magnetic waves are travel with the same speed irrespective of the nature of the medium
d)		Electromagnetic waves travel with the velocity of light in vaccum

18. The speed of electromagnetic waves in vaccum

a)		$\frac{1}{\sqrt{μ_{0} ϵ_{0}}}$
b)		$\sqrt{μ_{0} ϵ_{0}}$
c)		$ϵ_{0} μ_{0}$
d)		$\frac{1}{μ_{0} ϵ_{0}}$

19. The displacement current flows in the dielectric of a capacitor, when the potential difference across its plates

a)		is increasing with time
b)		decreasing with time
c)		becomes zero
d)		both a and b

20. Which of the following is not an electromagnetic waves?

a)		x- ray
b)		alpha ray
c)		gamma ray
d)		light waves

21. Displacement current was first proosed by

a)		Ampere
b)		Hertz
c)		Maxwell
d)		Bose

22. All members of the electromagnetic spectrum have the same

a)		frequency
b)		velocity
c)		wave length
d)		wave number

23. The existence of EM waves were experimentally confirmed by

a)		Maxwell
b)		Faraday
c)		Hertz
d)		Tesla

24. Electro magnetic theory suggests that the light consists of

a)		magnetic vector alone
b)		electric vector alone
c)		electric and magnetic vectors perpendicular to each other.
d)		parallel electric and magnetic vector

25. Electro magnetic waves of wave length ranging from 100 $Å$ to 4000 $Å$ come under

a)		x-rays
b)		UV region
c)		visible region
d)		infra-red region

26. All the members of electro magnetic spectrum have same

a)		frequency
b)		velocity
c)		wave length
d)		wave number

27. The TV transmission tower in Delhi has a height of 240m. The distance upto when the broadcast can be received [taking radius of earth to be $6.4 \times 10^{6} m$ ]

a)		100 km
b)		60 km
c)		55 km
d)		50 km

28. Pick out the odd one which has extremely short wave length much shorter than that of visible light and can be emitted from the nucleus of an atom.

a)		UV radiation
b)		beta radiation
c)		$γ$ radiation
d)		infra red radiation

29. displacement current was first produced by

a)		Ampere
b)		Henry
c)		Maxwell
d)		base

30. If there are no atmosphere the average temperature on the surface of the earth would be

a)		lower
b)		higher
c)		same as now
d)		$0^{0} C$

31. Electromagnetic waves are

a)		longitudinal waves
b)		transverse waves
c)		neither longitudinal nor transverse
d)		stationary waves

32. The Faraday constant F is related to Avogadro number N as

a)		$F = Ne$
b)		$F = N / e$
c)		$F = N^{2} e$
d)		$F = {Ne}^{2}$