Question # 1

The first superconductor was discovered in:

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1831

1911

1921

1876

If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.

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3.40 eV

10.20 eV

13.6 eV

3.8 eV

Force on a charged particle is zero when projected at angle with magnetic field.

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0 ^o

90^o

180^o

270^o

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

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136.0 volt

3.0 volt

13.6 volt

None of these

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

Balmer series lies in

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Visible region

Invisible region

Ultraviolet region

Infrared region

Which one of the following resistance is used to convert a Galvanometer into an ammeter.

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High resistance

Low resistance in series with galvanometer

Shunt

High resistance in series with galvanometer

Electro encephalon graph is the diagnostic test for the working of.

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Eye

Heart

Brain

Lungs

The acceleration of an electron of mass m and charge e, moving with uniform speed v at right angles to a magnetic field of flux density B, is given by

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Bevm

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

Which of the following basic force is able to provide an attraction between two neutrons:

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Electrostatic and nuclear b

Electrostatic and gravitational

Gravitational and strong nuclear

Only nuclear force

5 A of current flows through a conductor in 2 minutes, charge in the wire is.

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500 C

600 C

400 C

10 C

The most abundant isotope of neon is:

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Neon 21

Neon 20

Neon 22

None of above

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

For non-ohmic devices, the graph between V and I is

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Not a straight line

A straight line

A curve

All of above

When charge particle enter perpendicular to magnetic field, the path followed by it is:

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A helix

A circle

Straight line

Ellipes

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

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