Question # 1

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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1.66 m

1.0 m

0.66 m

2.66 m

One radian is:

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Greater than one degree

Less than one degree

Equal to one degree

None of these

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

Bernoulli's equation is important in the field of

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Electrical circuit

Magnetism

Photoelectric effect

Flow of fluids

Wave length of light, on the average, is given by:

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10^-14_m

10^-10_m

10^-6_m

10^-4_m

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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Newton

Joule

Joule-Sec

Joule-s^-1

Watt

When a position comes close to an electron they annihilate into

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one photon

two photons which travel in the same direction

two photons which travels in the opposite direction

two photons which travel in any direction

Fire fighters have a jet attached to the head of their water pipes in order to head of their water pipes in order to

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Increase the mass of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Heating effect of current utilized in:

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Electric motor

Electric toaster

Electroplating

Electric kettle

Both (B) and (D)

If they donot have a = 9.8 ms^-2 they would fly

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In the same orbit

Off in a straight the tangent to Earth

Leaving the present orbit

None of these

To demonstrate the phenomenon of interference we require two sources that emit radiation

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Of same frequency

Different wavelength

Of the same frequency and having definite phase relationship

Of nearly the same frequency

If we know the refractive index of glass, speed v of light in the glass can be found by

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v = c n

v = c/n

v = n/c

None of these

A reversible process is one which can be retracted in exactly reverse order with change in the

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System

Surroundings

System and surroundings

None of these

The force which maintains the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

For a point source of light the wave front produced are

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Circular

Spherical

Cylinrical

None

The computer chips are made from

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Semiconductor

Conductor

Silicon

Sand

Two substances having the same crystal structure are called:

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Isomorphism

Subtance

Allotropic subtances

Polymorphous substances

How are X-rays diffracted by crystals in X-rays crystallography?

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they bounce off the nucleus

they are diffracted whey they pass from between them acting as a slit

they are diffracted by the electron clouds in the atoms

they hit the side the nucleus and change direction and thus are diffracted

Approximate power of colour T.V. in watt is

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90

100

130

120

The image of an object 5 mm length is only 1 cm high. The magnification of the lens is

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1

0.2

2

0.1

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