Question # 1

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

The twinkling of stars is due to

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The fact that stars do not emit light continuously

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of them

In an AC circuit a resistance of R ohm i connected in series with an inductance L if phase angle between voltage and current be 45^o the value of inductive reactance will be

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R/4

R/2

R

Two electric bulbs of 200 W and 100 W have same voltage.If R1 and R2 be their resistance respectively then

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R₁ = 2R₂

R₂ = 2R₁

R₂ = 4R₁

R₁ = 4R₂

Which one of the following phenomena is not explained by Huygen's construction of wavefront?

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Refraction

Reflection

Diffraction

Origin of spectra

Two point charge +3μC and +8μC repel each other with a force of 40 N. if a charge of -5μC is added to each of them then the force between will become

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-10N

+10N

+20N

-20N

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

A sun rise or sun set, the sun looks reddish because.

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

A particle moving in a magnetic field has increase in its velocity then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

A point charge Q is placed at the mid-point of a line joining two charges 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

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