Question # 1

Split rings act as

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Vibrator

Resistor

Motor

Commulator

The unit of spring constant is

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J-sec

Metre

Nm^-1

None of these

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

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power

current

resistance

temperature

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

Certain charge +q is placed at the center of a sphere. At each of the sphere,The directions of electric intensity and vector area are:

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Same

Different

Opposite to each other

At 60º with each other

Both (B) and (C)

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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one

two

three

four

five

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

The short distance between two points direction from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

When two waves with same frequency and constant phase difference phase difference interfere

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There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

Alternating current is produced by a voltage source which polarity:

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Remains the same

Reverse after period T

Keeps on reversing with time

Reverse after every time interval T/2

Both (C) and (D)

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

The equation W = ________𝜟U represents:

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Thermal process

adiabatic process

Isobaric process

None of these

A plane wavefront is that which has source

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Nearest

Distant

Near

None of these

When the temperature difference between the source and the the sink increases, the efficiency of the heat engine will

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Increase

Decrease

Is not affected

May increase or decrease depending upon the nature of the working substance

Period of vibration of an atom in a solid is

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1 × 10^-10 sec

_{1 × 10}^-13_sec

1 × 10^-16 sec

1 × 10^-19 sec

Bulk modulus for mercury is

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27

29

29.4

30

The central point in the Newton's rings is dark due to

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Destructive interference

Constructive interference

Additional of path difference λ/2

b and c

The ratio of the diameter of two convex lenses is the ratio of their focal lengths

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Greater than

Less than

Equal to

None

Stress may cause a change in:

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Length

Volume

Shape

Any of these

None of these

The ballistic missiles are useful only for

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long ranges

short ranges

medium ranges

none of them

If a source of light is moving away from stationary observer then frequency of light wave appears to change because of

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Doppler's effect

Interference

Diffraction

None of the above

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