Question # 1

Lens's law deals with the

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Magnitude of induced current

Magnitude of induced e.m.f

Direction of induced e.m.f

Direction of induced current

In a heat engine, heat is supplied by the

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cold reservoir

sink

hot reservoir

none of them

Improper biasing of a transistor circuit produces

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Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

The magnitude of resultant of three vectors is 3. Its x-component is one, y-component is two, then its z-component is:

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0

1

2

3

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

If the acceleration of a body is negative, then slope of the velocity-time graph will be:

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Zero

Positive

Negative

Infinity

Acceleration of the mass at any instant is given by

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a=k/m x

a= - m/k x

a = - k/m x

a=m/k x

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

Absolute potential at infinity is

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Maximum

Minimum

Zero

None of these

A capacitor is charged with a battery and then it is disconnected A slab of dielectric is now inserted between the plates then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increases stored energy decreases and charge remains the same

Potential difference between the plates decreases,stored energy decreases and charge remains unchanged

None of the above

A mental wire is stretched by suspending weight to if x is the longitudinal strain and y is young s modulus of elasticity then the elastic potential energy per unit volume is

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1/2 y x²

x² / 2y

y² / 2x

x² / 2y

Steam engine is:

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An optical system

A thermal system

A thermodynamic system

None of these

The ratio of output work per cycle to input energy per cycle is called:

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Entropy

Internal energy

Efficiency

None of these

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

The typical example/examples of optically active crystals

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Quartz

Crystals of sodium chlorate

Crystals of sodium chloride

a and b

By which velocity a ball be projected vertically so that the distance covered by it in 5th seconds is twice the distance it covers in its 6th second (g = 10 m/s²).

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58.8 m/s

49 m/s

65 m/s

19.6 m/s

The speed of light in vacuum is 3 x 10⁸ ms^-1.Its speed in a medium of refractive index 1.5 will be

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6.5 x 10⁸

2 x 10⁸ ms^-1

4.5 x 10⁸ cm

5.5 x 10⁸

The specific resistance of a wire varies with its:

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Length

Cross-section

Mass

Material

The low blood pressure is

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70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

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