Question # 1

The contrast in the fringes in any interference pattern depends on

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Fringe width

Intensity ratio of the sources

Distance between the slits

Wavelength

Two points charges A and B separated by a distance R attract each other with a force of 12 x 10^-3 N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?

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12

6

3

2

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

The nuclear model of atom was proposed by

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J.J Thomson

E.Rutherford

Neil Bohr

Summerfield

Which of the modulus of elasticity is involved in compressing a rod to decrease its length?

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Young's modulus

Bulk modulus

Modulus of rigidity

None of the above

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

A particle is moving in a uniform magnetic field then

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Its momentum changes but total energy remains the same

Both momentum and total energy remains the same

Both changes

Total energy change but momentum remains

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

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