Question # 1

Phase difference between V and I of an A.C through resistor is.

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Zero Degree

90 ^o

80^o

120^o

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

Colour codes are used to calculate the.

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Nature of resistor

Numerical value of resistance

Potential difference

Current

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

In three phase A.C. generator the phase difference between each pair of coil is.

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45^o

90^o

120^o

60^o

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

For ohmic device the graph between V and I is.

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A straight line

Curve

Hyperbola

Parabola

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

Magnetism is related to:

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Stationary charges

Moving charges

Stationary & Movingcharges

Law of motion

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

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

Example of ductile substance is.

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Glass

Wood

Lead

Oxygen

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

Binding energy per nucleon is maximum for

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Platinum

Iron

Uranium

Lead

The number of neutron present in a nucleus in a given by

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N = A+Z

N = A- z

N = Z - A

N = A X Z

A charge on 4 coulomb is in the field of intensity 4N/C the force on the charge is.

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Uniform

Non uniform

Weak

Strong

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