Question # 1

In magnet-coil experiment, emf can be produced by

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving

Relative motion of the loop and magnet

Any one of above

All above

Electron gun consist of

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three anodes

heating cathode

three anodes

three anodes , heating cathode, grid

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

The term drift velocity is used when the ends of a wire are:

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Connected to a laser source

Connected to a voltage source

Not connected to a voltage source

At different values of potential

Both (B) and (D)

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

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10μF

20μF

30μF

15μF

One radian is:

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Greater than one degree

Less than one degree

Equal to one degree

None of them

The fluid is incompressible, if itsdensity is

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zero

constant

very high

very small

The ratio of linear stress/linear strain is called as

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Yong's modulus

Bulk modulus

Shear modulus

Modulus

Absolute motion cannot be detected

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in its own frame of references

in a different frame of references

both in its frame and different frame of references

none of these

When seen in green light the saffron and green portions of our National Flag will appear to be

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Black

Black and green respectively

Green

Green and yellow respectively

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all material

a given material

all of them

A compound microscope is consists of

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One convex lens

Two convex lenses

Two concave lenses

None of these

If a light of λ = 588 nm falls on half silvered glass plate in Michelson s interferometer if movable mirror is moved through 0.233 mm the number of fringes will be observed to shift

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795

792

786

None

Which one the following gives three regions of electromagnetic sepctrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, Infrared rays, micro waves

Visible light, gamma rays, radio waves

The digital modulation is expressed in

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Bytes

Codes

Bits

None of these

While applying Guass's Law assuming that the field is

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In different directions

Constant in direction

In all directions

None of these

We can divide the optical fibres on the basis of the mode by which they propagate light in

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two types

three types

four types

many types

The actual efficiency of properly tuned engine is usually not more than

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20% to 35%

25% to 30%

25% to 40%

None of these

The viscosity of water is

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0.019 x 10^-3 Nsm^-2

0.801 x 10^-3 N-sm^-2

6.29 x 10^-3 N-sm^-2

0.081 x 10³ N-sm^-2

The re conversion of light signals into electrical signals takes place due to

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Transmitter

Receiver

Generator

None of these

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