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Q1. | X-rays cannot penetrate through a thick sheet of |

A. | wood [Wrong Answer] |

B. | paper [Wrong Answer] |

C. | lead [Correct Answer] |

D. | aluminium [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 :**

⇒

Match the following:

List I (Octal) | List II (Decimal number) | ||
---|---|---|---|

A. | 35 | 1. | 53 |

B. | 65 | 2. | 62 |

C. | 54 | 3. | 29 |

D. | 76 | 4. | 44 |

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

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

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

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

⇒ Which of the following is a vector quantity?

Standing wave ratio

Reflection coefficient

Gain

All of the above

⇒

**Assertion (A):** Linear ICs include audio amplifier, wideband amplifier, RF amplifier and IF amplifier

**Reason (R):** The error voltage in a feedback circuit is very small

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

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

A is correct R is wrong

A is wrong R is correct

⇒ In FM, as the modulating frequency decreases and the modulating voltage amplitude

increases, the modulation index increases

decrease, the modulation index increases

remains constant, the modulation index increases

remains constant, the modulation index decreases

⇒ Two wattmeter method for 3 phase power measurement can be used only for

balanced loads

unbalanced loads

both balanced and unbalanced loads

star connected loads

⇒ For 10 bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will

increased by 6 dB

increased by 12 dB

decreased by 6 dB

decreased by 12 dB

⇒ The signal m(

*t*) = 10 cos 100 p

*t*is sampled at the rate of F

_{s}= 75 H

_{z, }then determine signal after sampling.

4 cos 100 p

*t*+ 8 sin 200 p

*t*

4 cos 100 p

*t*+ 8 sin 200 p

*t*+ cos 75 p

*t*

4 cos 25 p

*t*+ 8 sin 50 p

*t*+ cos 75 p

*t*

none

⇒ Neutralization is used in RF amplifiers to

stop oscillation

increase bandwidth

improve selectivity

all of the above

⇒ Resistivity of carbon is around

10 to 70 m-ohm-cm

80 to 130 m-ohm-cm

800 to 1300 m-ohm-cm

8000 to 13000 m-ohm-cm

⇒

**Assertion (A):** Drift velocity of electrons is proportional to the applied electric field E.

**Reason (R):** The average drift velocity per unit field is called mobility.

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

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

A is true but R is false

A is false but R is true

⇒ For a binary half subtractor having two inputs

*A*and

*B*the correct sets of logical expressions for the outputs

*D*(

*A*-

*B*) and

*X*= Borrow are

D = AB + AB, X = AB

D = AB AB, X = AB

D = AB + AB, X = AB

D = AB + A B, X = AB

⇒ Full duplex operation-permits transmission in both directions at the same time.

TRUE

FALSE

⇒ In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is

1

2

3

4

⇒ In the circuit of the given figure,

0

1

X

X

⇒ Transit time is considered as significant at

HF

MF

LF

all of the above

⇒ The hexadecimal number given below represent decimal numbers which are multiples of DC, C8, BE, 46, IE

2

6

7

10

⇒ Capacitance hats are installed on low frequency antenna is

increase the electrical length

reduce the electrical length

protect against lightening

protect against corona effects

⇒ The p mode of operation of magnetron signifies that

the phase difference between adjacent anode poles is p radians

the phase difference between adjacent anode poles is a multiple of p radians

the total phase shift around the periphery is p radians

none of the above

⇒ The two numbers represent in signed 2's complement form are P = 11101101 and Q = 111001110. If Q subtracted from P, the value obtained in signed 2's complement form is

100000111

111

11111001

111111001

⇒ For a random variable

*x*following the probability density function, p(

*x*), shown in figure, the mean and the variance are respective

1/2 and 2/3

1 and 4/3

1 and 2/3

2 and 4/3

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

homogeneity condition

superposition condition

both (a) and (b)

associative condition

⇒ For AB + A C + BC = AB + A C the dual form is

(A + B) (A + C)(B + C) = (A + B)(A + C)

(A + B ) (A + C)(B + C) = (A + B)(A + C)

(A + B) (A + C) (B + C) = (A + B) (A + C)

none of the above

⇒ Which pair is correctly matched?

Symmetrical two port AD - BC = 1

Reciprocal two port

*z*

_{11}=

*z*

_{12}

Inverse hybrid parameter A, B, C, D

hybrid parameter (V

_{1}, I

_{2}) =

*f*(I

_{1}, V

_{2})

⇒ The potential of suppressor grid (with respect to cathode) is usually

zero

negative

positive

zero or positive

⇒ In TV scanning sequence of lines is

left to right

right to left

left to right for odd fields and right to left for even field

left to right for even fields and right to left for odd field

⇒ A variable reluctance tachometer has 180 teeth on rotor. The speed of shaft on which it is mounted in 1200 rpm. The frequency of output pulses is

1800 per second

3600 per second

4800 per second

5600 per second

⇒ The

*v*-

*i*characteristic of an element is shown in below figure the elemen

non-linear, active, non-bilateral

linear, active, non-bilateral

non-linear, passive, non-bilateral

non-linear, active, bilateral

⇒ Fields are said to be circularly polarized if

their magnitudes are equal

their magnitudes are equal and they differ in phase by ± 90°

their magnitudes are unequal and they differ in phase ± 90°

their magnitudes are unequal and they are in phase

⇒ In figure, the current after a long time after closing of switc

0.0416666666666667

0.0833333333333333

0

infinity

⇒ Symbol shown in figure represen

P-channel DMOSFET

N-channel DMOSFET

UJT with P-type base

UJT with N-type base