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Q1. | To study electromagnetic radiations from astronomical objects, radio astronomers use |

A. | low frequencies [Wrong Answer] |

B. | medium frequencies [Wrong Answer] |

C. | microwaves [Correct Answer] |

D. | either (a) or (b) [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 :**

⇒ In VHS format diameter of head drum is about

1 m

20 cm

6 cm

1 cm

⇒

**Assertion (A):** A PROM can be used as a synchronous counter

**Reason (R):** Each memory location in a PROM can be read synchronously.

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

Both A and R are correct but R is not correct explanation of A

A is true, R is false

A is false, R is true

⇒ A parallel plate capacitor having C = 200 x 10

^{-12}F has loss dielectric having tan δ = 4 x 10

^{-4}. At an ac voltage of

*f*= 10

^{6}Hz and peak value 2 V, the dielectric losses are

10

^{-8}W

10

^{-6}W

10

^{-4}W

10

^{-2}W

⇒ If operator '

*a*' = 1 ∠120° then (1 -

*a*

^{2}) =

1 ∠ - 30°

1 ∠ 30°

1 ∠ - 60°

1 ∠60°

⇒

Match the following:

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

A. | CLP | 1. | Measure of μP clock speed |

B. | SHELL | 2. | Double sided double density |

C. | DSDD | 3. | Allows you to specify file as command processor |

D. | Megahertz | 4. | Microcode stored in ROM |

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

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

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

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

⇒ A computer program is used to read N and compute N !. IF N = 6, the result will be

6

12

720

1040

⇒ In an AM wave the carrier and one of the side bands is suppressed. If

*m*= 1, the percentage saving in power is

0.25

0.5

0.666

0.833

⇒ What is the numerical aperture an optical fiber when critical angle is 30°?

0.5

0.704

0.866

0.2

⇒ In communication satellites, the up-link normally operates at a higher frequency than the down-link because it

gives a narrow beam shining into space

results in lesser signal attenuation

gives better beam-shaping

is easier to polarize a high frequency beam

⇒ In a series RLC circuit, the current at resonance is I

_{0}the total energy stored in the circuit at resonance is

LI

_{0}

^{2}

2 LI

_{0}

^{2}

2 LI

_{0}

^{2}

0.5 LI

^{2}

⇒ A

*h*is the unit of quantity of electricity.

TRUE

FALSE

⇒ A circuit has two branches in parallel and each branch has only one element. The applied voltage and source current are

*v*= 200 sin (200

*t*+ 30°) and

*i*= 50 sin (200

*t*+ 50°). If one branch has capacitor, the other branch contains

resistance

inductance

capacitance

resistance or capacitance

⇒ The thermionic emission current is given by

Fermi-Dirac distribution

Maxwell's equation

Richardson Dushman equation

Langmuir Child law

⇒ In a 3 phase full converter, the firing angle is less than 60°. The instantaneous output voltage

will have positive part only

will have both positive and negative parts

may have both positive and negative parts

will have negative part if load is inductive

⇒ In an

*ac*circuit that delivers constant power at varying p.f., the current is

lowest when p.f. is leading

lowest when p.f. is lagging

lowest when p.f is unity

the same for all power factors

⇒ A capacitor whose capacitance C

_{t}= C

_{0}(1- cos ω

*t*) is fed by a sinusoidal voltage

*v*= V

_{0}sin ω

*t*. The equation for current

*i*is

ω C

_{0}V

_{0}cos ω

*t*

ω C

_{0}V

_{0}sin ω

*t*

ω C

_{0}V

_{0}(cos ω

*t*- cos

^{2}ω

*t*)

none of the above

⇒ The statement

`IMPLICIT INTEGER (A - F)`

in FORTRAN identifiesall variable names which begin with A, B, C, D, E or F as being of integer type

all character names which begin with A, B, C, D, E, or F as being of integer type

all variable names which begin with A and have 6 characters

none of the above

⇒ Consider the following program in C

0.2

0

3

⇒ The name field effect is related to the __________ layers of a JFET.

depletion

drain

source

gate

⇒ 8255 A has three 8 bit ports A, B, C for peripheral data transfer. For programming 8255 A, these ports are grouped as

Port A with Port B

Port A with 4 most significant ports of C, port B with 4 least significant ports of C

Port A with Port C

none of the above

⇒ A 10 bit ADC with a full scale output voltage of 10.24 V is to be designed to have ± LSB/2 accuracy. If ADC is calibrated at 25°C, the maximum net temperature coefficient of ADC should not exceed

± 200 μV/°C

± 400 μV/°C

± 600 μV/°C

± 800 μV/°C

⇒ A first order system will never be able to give a __________ response

- band stop
- band pass
- all pass

1, 2, 3 true

1 and 3 true, 2 false

1, 2 are true 3 is false

1, 2 are false, 3 is true

⇒ The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply of frequency of

30 kHz

15 kHz

5 kHz

20 kHz

⇒ If the number of information bits is m, the number of parity bits p in the Hamming code is given by equation

2

^{p}= m + p + 1

2

^{p}≥ m + p + 1

2

^{P}= m + p

2

^{p}≥ m + p

⇒ A coil has a resistance of 2 Ω and inductance of 0.1 mH. The applied voltages is suddenly increased from 10 V to 20 V. After steady state condition have reached, the current is

0.0833333333333333

more than 2 A but less than 4 A

0.166666666666667

more than 4 A

⇒ Which of the following is taken as reference antenna for directive gain?

Half wave dipole

Elementary doublet

Isotropic

Infinitesimal dipole

⇒ If μ

_{n}is mobility of free electron and μ

_{p}is mobility of holes then for silicon at 300 K

μ

_{n}= μ

_{p}

μ

_{n}> μ

_{p}

μ

_{n}< μ

_{p}

μ

_{n}may be more or less than μ

_{p}

⇒ When a coil consisting of single turn rotates at a uniform speed in a magnetic field, the induced e.m.f. is

changing

reversing

steady

alternating

⇒ Reciprocity theorem is applicable to

circuits with one source

circuits with only one independent source

circuits with any number of sources

circuits with any number of independent sources

⇒ The initial state of MOD-16 down counter is 0110. What state will it be after 37 clock pulses?

Indeterminate

110

101

1