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Q1. | Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 10^{14} Hz in glass. Assume velocity of light is 3 x 10^{8} m/sec in vacuum. |

A. | 4 μm [Wrong Answer] |

B. | 3 μm [Wrong Answer] |

C. | 2 μm [Correct Answer] |

D. | 1 μm [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ At resonance, the parallel circuit constituted by an iron-cored coil and a capacitor behaves

open circuit

short circuit

pure resistor of value R

pure resistor of value much higher than R

⇒ The two terms used to describe performance of a directional coupler are

coupling and directivity

gain and coupling

gain and directivity

gain and isolation

⇒ A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will

increase

decrease

remain the same

may increase or decrease

⇒ The

*r*

_{e}model equivalent circuit shown in figure is

CE amplifier

CC amplifier

CB amplifier

None of the above

⇒

**Assertion (A):** In drawing an electric circuit analogous to a mechanical circuit, spring is replaced by capacitance.

**Reason (R):** The behaviour of a spring and capacitor are similar.

Both A and R are true and R is correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

⇒ Current derating may be necessary when thyristors are operating in

series

parallel

series or parallel

none of the above

⇒ Using 2's complement, the largest positive and negative number which can be stored with 8 bits are

+128 and -127

+128 and -128

+127 and -128

+127 and -127

⇒ Consider the following features of an instrument

- suitable for both ac and dc
- free from hysteresis and eddy current errors
- No waveform and frequency errors
- it is essentially a voltmeter

moving iron

moving coil

electrostatic

dynamometer

⇒ An electrostatic voltmeter is suitable for

low voltage at high frequency

high voltage

low voltage at low frequency

all ac and dc voltages

⇒ Which of the following is not an application software?

MS Word

DBMS

Worksheet

Lisp

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | RF amplifier | 1. | Amplifier received carrier and sidebands |

B. | Loudspeaker | 2. | Gives acoustic output |

C. | Demodulator | 3. | Has IF input and AF output |

D. | IF amplifier | 4. | Fixed-tuned to intermediate frequency |

A-1, B-2, C-3, D-4

A-2, B-1, C-3, D-4

A-3, B-4, C-1, D-2

A-1, B-4, C-3, D-2

⇒ For decimal numbe'r 13.5, the floating point representation in 4 byte excess 128 code is

01101100 00000000 00000000 10000100

00000000 01101100 00000000 10000100

00000000 01101100 10000100 00000000

01101100 00000000 10000100 00000000

⇒ A network is said to be non-linear if it does not satisfy

homogeneity condition

superposition condition

both (a) and (b)

associative condition

⇒ In a platinum RTD, the change in resistance for a temperature rise of 50° C is about

0.02

0.1

0.2

0.4

⇒ The number of memory locations in which 14 address bits can access is

1024

2048

4096

16384

⇒ As the temperature of semiconductor is increased

the average number of free charge carriers decreases

the average number of free charge carriers increases

the average number of free charge carriers remains the same

the average number of free charge carriers may increase or decrease

⇒ The critical frequency of 'F' layer is greater than 30 MHz.

TRUE

FALSE

⇒ A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is

20 W

50 W

92 W

128 W

⇒ In intrinsic semiconductor magnitude of free electron and hole concentrations are equal.

TRUE

FALSE

⇒ 25 persons are in a room. 15 of them play hockey, 17 of them play football and 10 of them play both hockey and football. Then the number of persons playing neither hockey nor football is:

2

17

13

3

⇒ For the two ports in figure,

*y*

_{11}= 8 mho,

*y*

_{12}=

*y*

_{21}= -6 mho and

*y*

_{22}= 6 mho. The values of Y

_{A}, Y

_{B}, Y

_{C}respectively

2, 6, 6 mho

2, 6, 0 mho

2, 0, 6 mho

2, 6, 8 mho

⇒ Which one of the following effects is used in measuring power?

Seeback

Ferrari

Induction

Hall

⇒ The drift velocity of electrons and holes is proportional to electric field strength.

TRUE

FALSE

⇒ A dynamic RAM cell which holds 5 V has to be refreshed every 20 ms so that the stored voltage does not fall by more than 0.5 V. If the cell has a constant discharge current of 0.1 pA, the storage capacitance of cell is

4 x 10

^{-6}F

4 x 10

^{-9}F

4 x 10

^{-12}F

4 x 10

^{-15}F

⇒ Consider the following statements

- The amplitude of an FM wave is constant
- FM is more immune to noise than AM
- FM broadcasts operate in upper VHF and UHF frequency ranges
- FM transmitting and receiving equipments are simpler as compared to AM transmitting and receiving equipments

1, 2, 3, 4

1, 2, 3

2, 3, 4

1, 3, 4

⇒ In a C expression using assignment operators, relational operators and arithmetic operators, the hierarchy of operations (in the absence of parenthesis) is

assignment, relational, arithmetic

relational, assignment, arithmetic

arithmetic, assignment, relational

arithmetic, relational, assignment

⇒ Which of the following terminations makes the input impedance of a line equal to characteristic impedance Z

_{0}?

line open circuited at far end

line terminated in Z

_{0}

line short circuited at far end

line terminated in inductance

⇒ The usable bandwidth of ridge wave guide

is lower than that of rectangular waveguide

is higher than that of rectangular waveguide

is almost same as that of rectangular waveguide

is very small as compared to that of rectangular waveguide

⇒ The function

*f*(

*t*) = E[u(

*t*-

*a*) -

*u*(

*t*-

*b*)] is

a pulse function originating at

*t*=

*a*

a step function orginating at

*t*= 0

an exponential function originating at

*t*=

*a*

a pulse function originating at

*t*=

*a*and duration (

*b*-

*a*)

⇒ Binary multiplication 1 x 0 =

1

0

10

11