Question # 1

When a mass 'm' is pulled slowly through a distance 'x_o' , the elastic potential energy of the spring would be

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P.E=Kx²_o

P.E= 1/2kx_o

P.E=1/2Kx²_o

P.E=Kx²_o

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

If two forces of magnitudes 3.5 and 2.5 N act on a body such that the angle between the forces is zero, then magnitude of the resultant will be:

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1.0 N

6 N

3.5 N

12 N

Field lines are closer to each other in the region where the filed is

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Stronger

Weaker

Much weaker

Absent

None of these

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

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

Wavelength of different colors is different

Velocity of different colors is different

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

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parallel to the field

Perpendicular to the field

At an angle of 45 to the field

None of the above

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

None of these

The idea of quantization of energy was proposed by:

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Einstein

Max.Planck

Maxwell

Bohr

Rutherford

Two sources of sound are said to be coherent if

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The produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase difference all instant of time

An important part of photocopier is:

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Toner cartridge

Deflection plates

Charging electrode

Print head

None of these

X-ray diffraction has been very useful in determining structure of

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Hemoglobin

Double helix structure of DNA

Blood speed

a and b

The speed of sound in air is

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320 ms^-1

323 ms^-1

330 ms^-1

333 ms^-1

Strain is dimensionless and has

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Units

No units

S.I. units

None of these

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

Which of the following frequency ranges includes most of the electromagnetic waves emitted by the ultra - violet tubes used in a sun bed?

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5 x 10⁵ to 5 x 10⁸ Hz

5 x 10⁸ to 5 x 10¹¹ Hz

5 x 10¹¹ to 5 x 10¹⁴ Hz

5 x 10¹⁴ to 5 x 10¹⁷ Hz

The relation Cp > Cv by an amount equal to

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Gas constant

Universal gas constant

Both

None of these

The bottom of a container filled with liquid appear slightly raised because of

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Refraction

Interference

Diffraction

Reflection

In bring an electron towards another electron,electrostatic potential energy of system.

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Decreases

Increases

Remains uncharged

Becomes zero

An optical fibre with its protective case may be typically

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6 m

6 mm

6 cm

6 nm

Remanance or Retentivity is the phenomenon in which the material still remains strongly magnetized when curve is

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Increase to maximum

Reduce to minimum

Reduce to zero

None of these

If the direction of the applied force is reversed then

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Its torque remain unchanged

The magnitude of its torque changes and direction of the torque remains the same

The magnitude of its torque remains the same but the direction of the torque reverses

Torque is also reversed

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