Question # 1

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

The reverse saturation current in a PN junction diode is only due to:

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Majority carriers

Minoritycarriers

Acceptor ions

Donor ions

Balmer series lies in

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Visible region

Invisible region

Ultraviolet region

Infrared region

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

When a PN-Junction is reverse biased the depletion region is.

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Widened

Narrowed

Normal

None of these

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

The fact that electric field exist in space around an electrical charge is

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Electrical property

Gravitational property

Intrinsic property of nature

Extrinsic property of nature

In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

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90^oC

Zero

120^oC

45^oC

The value of capacitive reactance is given by

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Xc = VI

All of above

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