Question # 1

When the pn-junction is forward biased. the current flows through it is of the order of

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mili-amperes

amperes

nano-amperes

micro-amperes

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

According to the Bernoulli's theorem the pressure velocity are

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equal to each other

proportional to each other

inversely proportional to each other

none of them

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

A circuit has a resistance of 11Ωan inductive reactance of 25Ωand a capacitance reactance of 18Ω. It is connected to an a.c. source of 200 V and 50 Hz. The current through the circuit (in amperes) is

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11

15

18

20

The law of conservation of mass gives us the

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equation of continuity

Bernoulli's theorem

both of them

none of them

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

The unit of induced emf is:

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Volt

Nm/As

Joule coul^-1

Both A and C

All of these

To sources are said to be coherent if they have:

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

When a source of light isat very large distance,the shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

A steel bar can bear a load of 20 tons. If the thickness of bar is double, then for the same depression it can bear a load of:

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40 ton

80 ton

160 ton

5 ton

Uniform acceleration is defined as

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Average acceleration

Instantaneous acceleration

Equal change in velocity and time

None of these

The right hand rule is applied to find

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The direction of a vector obtained by the vector product of two vectors

The magnitude of the vector obtained in the above manner

Neither the direction nor the magnitude

None of these

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream line body

None of these

Repeaters are the devices which regenerate the signals and are placed at about

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20 km

30 km

40 km

50 km

Conductors are those materials in which energy gap is

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very large (several eV)

very narrow (= 1eV)

either of them

none of them

The percentage errors in the measurement of mass and speed are 3% and 4% respectively.The maximum error in the measurement of kinetic energy is:

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11%

10%

8%

9%

The capacity of a parallel plat capacitor depends on the

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Type of metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

Work done is expanding gas under adiabatic condition results

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Increase in temperature

Decrease in temperature

No change in temperature

None of these

Nuclear fission experiments show that the neutrons the uranium nuclei into two fragment of about the same size. This process is accompanied by the emission of several:

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Protons and positrons

𝛼 −partilces

neutrons

Protons and 𝛼 −partilces

While viewing a distant object with a telescope suddenly a housefly sits on objective lens.The correct statement is that

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Housefly will be seen enlarged in image

Housefly will be seen reduced in image

Intensity of image will be decreased

Intensity of image will be increased

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