Question # 1

Ultra-violet rays differ from X-rays in that they

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Cannot be diffracted

Cannot be polarized

Have a lower frequency

Are deviated when they pass through a magnetic field

If a given spring of spring constant k is cut into two indentical segments, the spring constant of each segment is:

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k/2

2 k

4 k

None of these

The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon

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Heating effect of current

Chemical effect of current

Magnetic effect of current

Electromagnetic effect of current

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

Which of the following pairs does not have identical dimensions?

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Torque and energy

Energy and work

Momentum and impulse

Mass and moment of inertia

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

CRO deflects the beam of

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proton

a-particle

electron

neutron

The resistance of the given conductor can be increased by

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Increasing the area

Changing resistivity

Decreasing the length

None of the above because change does not matter because in any case the volume remains the same

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

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I_cwill decrease

V_CEwill increase

I_Cwill increase

V_CCwill increase

An object undergoes SHM. Its maximum equilibrium positions:

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Maximum

Half of its maximum value

Zero

None

In a normal healthy person the value of systolic pressure is

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75 torr

80 torr

120 torr

all of them

A typical diffraction grating has lines per centimeter

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10 to 100

100 to 1000

1000 to 5000

400 to 5000

A finite volume of gas consists of molecules

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Very small

Large

Very large

None of these

Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:

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Zero

10 N

20 N

10 √2 N

The transmitter in optical fiber system contains a device called

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LED

Diode

Transistor

None of these

If a machine does work at the rate of 1.0 joules in energy two 5 seconds, then its power is said to be

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0.25 watt

0.20 watt

1 watt

None of these

When sunlight falls on a soap bubble (film), it appears coloured because of

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interference of light

dispersion of light

polarization of light

diffraction of light

The body is in a dynamic equilibrium when it is

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At rest

In motion

In uniform motion

Acceleration motion

The work done by the gas during the isobaric expansion is equal to

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Area of rectangle

Area of triangle

Area of parallelogram

None of these

The linear acceleration of the particle of mass m describing a horizontal circle of radius r with angular speed ω is

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rω

ω/r

rω²

r²ω

In which process the change in internal energy of the system is zero:

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Isochoric process

Isobaric process

Adiabatic process

Isothermal process

If one atom or molecule lies out each of the eight corners of a cube, it is called

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Simple cube

Face centered cube

Body centered cube

None of these

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