Question # 1

Strength of magnetic field is measured in SI units, in:

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N

N/Am

Am/N

Nm/A

None of these

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°. the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

Two vectors having different magnitudes:

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Have their directions opposite

May have their resultant zero

Cannot have their resultant zero

None of these

During the steady flow, different streamlines

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cannot across each other

can across each other

either of them

neither of them

In a transistor, the central region is called

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collector

emitter

base

none of them

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

The square of 0.4 is:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

The charge carries in the electrolyte are:

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Positive ions

Negative ions

Either (A) or (B)

Both (A) and (B)

Neither (A) nor (B)

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

Which one of the following waves belongs to electromagnetic spectrum

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Radio and TV waves

Radar waves

Micro waves

All of them

An ideal choke (used along with fluorescent tube) would be

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A pure resistor

A pure capacitor

A pure inductor

A combination of an inductor and a capacitor

When force F makes an angle θ with the position r relative to point O, then the toque will be

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τ = 0

τ = rF cos 0

τ = rF

rF sin θ

Turn table is the plateform over which we place

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Diffraction grating

Prism

Glass slab

a and b

For a system to transmit thousands of telephones conversations, several television programs and numerous data signals, it need the following number so threads of optical fibre

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100 to 200

1000 to 10000

100 to 1000

1 or 2

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

all of them

The dimensions [MLT^-2] refer to the quantity

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Acceleration

Velocity

Force

Momentum

When two balls collide then after collision, they rebound with velocities less than the velocities before the impact, because a portion of K.E is lost in the form of

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friction

heat energy

sound energy

all of them

The units of modulus of elasticity are

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Nm^-2

Nm²

Torr

Both B and C

The diode charactristics curve is plot between

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I & t

V& t

V& I

None

The phenomenon of radioactivity is associated with:

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Fission of nucleus

Disintegration of neutrons

Emission of spectral lines

Spontaneous disintegration of the nuclei of atoms

The resolving power of a grating spectrometer is

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Stress may be

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Tensile

Compressive

Shear

All of these

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