Question # 1

Balmer series was identified in:

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1685

1785

1885

1985

1585

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

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6 x 10^-5rad

7 x 10^-5rad

8 x 10^-5rad

None of these

If the value of galvanometer constant k = C/BAN is made small, the galvanometer can be made

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Sensitive

Accurate

Stable

None of these

The fluid is incompressible, if itsdensity is

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zero

constant

very high

very small

Strength of magnetic field is measured in SI units, in:

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N

N/Am

Am/N

Nm/A

None of these

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

The body oscillates due to ______ accelerates and overshoots the rest position due to _______

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Applied force, Inertia

Restoring force, Friction

Frictional force, Inertia

Restoring force, Inertia

Chock consumes externally small

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Charge

Current

Power

Potential

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

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Increase

Decrease

Remain F

Become 10F/9

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is:

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0.05 m

0.08 m

0.8 m

0.008 m

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

Truth of kinetic energy is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

A particle moving uniformly along circle its projection along diameter performs

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Linear motion

Projectile motion

SHM

Rotatory motion

In the formula R = N x m for diffraction grating, N denotes:

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No. of lines/cm

No. of lines/meter

Total number of lines

None of above

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

Swimming becomes possible because of______law of motion:

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First

Second

Third

None of these

Which quantity has the same units as impulse

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force

work

linear momentum

acceleration

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

The solids which has structure in-between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

The curve representing an adiabatic process is called

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isotherm

adiabat

adiable

none of them

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

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Four-fold

One-half

One-fourth

Zero

Gaussian surface is always:

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Rectangular

Spherical

Cylindrical

Box shape

Any of these

The change of order of vectors in a dot product of two vectors:

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Changes its value

Doesn't change it's value

Changes the direction product quantity

None of these

A body of mass 1.0 kg is falling with an acceleration of 10 m/s². Its apparent weight will be (g=10 m/s²)

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1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

The value of resistivity is the least for:

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Copper

Aluminimum

Silver

Tungsten

Iron

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

The Instantaneous value of alternative current maybe:

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The same as its RMS value

Greater than its Rms value

The same as its peak value

Any of these

None of these

Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:

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Is smaller than

Is greater than

Becomes equal to

None of these

The percentage of available heat energy converted into work by a petrol engine is roughly

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35 %

40 %

35 to 40 %

25 %

When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is

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90°

75°

0°

180°

If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:

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Increase

Decrease

Remains constant

None of these

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