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Q1. | In an hydrogen atom, an electron moves in the field of a proton. The stability of orbit requires equilibrium between coulomb's force and centrifugal force. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ A voltage

*v*= 100 sin (100 p

*t*+ 45°) V is applied to an impedance 10 +

*j*10 ohm. The current is

10 ∠45° A

7.07 ∠45° A

5 ∠45° A

5 ∠0 A

⇒ A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is

0.001 Ω

0.1001 Ω

100 Ω

1000 Ω

⇒ If air pressure in a rectangular waveguide is increased the maximum power handling capacity

is decreased

is increased

remains the same

may increase or decrease depending on pressure

⇒ The properties of FETs resemble closely to

UJT

current transformer

thyristor

thermionic valves

⇒ In 8421 Binary coded Decimal system the decimal number 237 is represented by

1000110111

1000111110

1000110111

10010010011

⇒ A remote control of TV uses a 10 bit word. The maximum number of total commands it can transmit is

64

256

512

1024

⇒ If

*f*(

*t*) = -

*f*(-

*t*) and

*f*(

*t*) satisfies Dirichlet conditions, then

*f*(

*t*) can be expanded in Fourier series having

sine terms only

cosine terms only

cosine and constant terms

sine and constant term

⇒ As temperature increases

the forbidden energy gap in silicon and germanium increase

the forbidden energy gap in silicon and germanium decrease

the forbidden energy gap in silicon decreases while that in germanium decreases

the forbidden energy gap in silicon increases while that in germanium decreases

⇒ The realization of the term Ks yields

a resistance of value K ohms

a capacitances of value K farads

an inductance of value k farads

either (b) or (c)

⇒ Capacitance hats are installed on low frequency antenna is

increase the electrical length

reduce the electrical length

protect against lightening

protect against corona effects

⇒ Antenna reciprocity is put to use in

radar system

commercial broadcast

TV broadcast system

none of the above

⇒ Two coil have their axis perpendicular to each other. The coefficient of coupling

*k*is

1

0.5

more than 0 but less than 1

0

⇒ Twelve 1 Ω resistance are used as edges to form a cube. The resistance between two diagonally opposite corners of the cube is

5/6 Ω

1 Ω

6/5 Ω

3/2 Ω

⇒ How is inversion achieved using EX-OR gate?

Giving input signal to the two input lines of the gate tied together

Giving input to one input line and logic one to the other line

Giving input to one input line and logic one to the other line

Inversion cannot be achieved using EX-OR gate

⇒ In figure the open circuit em

15 V

1.45 V

1.475 V

1.485 V

⇒ The overall noise temperature T

_{e}, absolute temperature T and noise figure F are related as

T

_{e}= T(F - 1)

T

_{e}= F(T - 1)

T = T

_{e}(F - 1)

T

_{e}= (T)(F)

⇒ In figure, V reads 45V. Then

10.1 A

13.3 A

16.1 A

19.4 A

⇒ The number of comparator circuits required to build a three-bit simultaneous A/D converter is

7

8

15

16

⇒ 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

⇒ In a series regulated power supply circuit the voltage gain of pass transistor satisfies the condition

A

_{v}→ ∞

1 << A

_{v}→ ∞

A

_{v}≈ 1

A

_{v}<< 1

⇒

**Assertion (A):** The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions.

**Reason (R):** Frequency response, in steady state, is obtained by replacing *s* in the transfer function by *j*ω

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 correct but R is wrong

R is correct but A is wrong

⇒ In the basic series inverter circuit, the source supplies load

only in positive half cycle

both in positive and negative half cycles

only in part of positive half cycle

in positive half cycle and part of negative half cycle

⇒ A sinusoidal carrier voltage, having frequency 1000 Hz is amplitude modulated by a sinusoidal voltage of frequency 15 kHz. The frequency of upper and lower sidebands will be

1015 kHz and 985 kHz

1030 kHz and 970 kHz

13 kHz and 17 kHz

14 kHz and 16 kHz

⇒ In the expression A + BC, the total number of minterms will be

2

3

4

5

⇒ In a half wave voltage doubler circuit the input frequency is 50 Hz. The ripple frequency is

25 Hz

50 Hz

100 Hz

150 Hz

⇒ Calculate the critical frequency for the E layer if maximum ionic densities are 3 x 10

^{6}

15.58 x 10

^{6}

15.58 kHz

1.58 x 10

^{3}

None of the above

⇒ The feedback technique employed in the following circuit

voltage series feedback

current series feedback

voltage shunt feedback

current shunt feedback

⇒ Which of the following 8085 instructions does not belong to arithmetic group?

`SHLD addr`

`SUI data`

`ADCM`

`INR r`

⇒ The forbidden energy gap for germanium is

0.12 eV

0.32 eV

0.72 eV

0.92 eV

⇒ Baudot code is a six bit code.

TRUE

FALSE