Question # 1

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

The shell closer to the nucleus is called:

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N shell

L shell

K shell

M shell

O shell

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

Compton was awarded Nobel prize in physics in

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1921

1923

1925

1927

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

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RMS value

Instantaneous value

Valued average over a cycle

Zero

Both (B) and (C)

In frequency modulation (FM), the carrier waves amplitude

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Remains constant

Increase

Decreases

None of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. The angle which the force makes the direction of motion will be:

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60°

90°

30°

0°

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

Waves transport energy

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without transport energy

with matter

both of them

none of them

Single mode step index fibre has a very thin core of about diameter

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5.5 μm

9.5 μm

5.0 μm

All of these

A spring balance is graduated at sea level. If the body is weighted with this balance at consecutively increasing heights form the earth's surface the weight indicated by the balance will

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Go on increasing continuously

Go on decreasing continuously

Remain the same

First increase and then decrease

The decrease in potential energy of a ball of mass 20 kg which falls from a height 50 cm is:

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968 J

98 J

1980 J

None of these

The conductivities of conductors (metals) have

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10⁵ (Ω)^-1

10⁷ (Ωm)^-1

10⁸ (Ωm)^-1

10⁹ (Ωm)^-1

When R_x and R_y are negative, the resultant lies in the third quadrant and its direction is

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θ = 180 + Φ

θ = 180 - Φ

θ = 90 + Φ

None of these

Which of the following strain are possible in solids

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Linear

Volumetric

Shear

All of these

The mass of Uranium atom is

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10^-10 Kg

10^-15 Kg

10^-20 Kg

10^-25 Kg

How many wave lengths of Kr⁸⁶ are contained in one meter

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1553164.13

652189.63

2347127.23

1650763.73

A person walks first 10 km north and 20 km east.then the resultant vector is

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22.36 km

22.46 km

25.23 km

20.36 km

The geo-stationary orbit, in which, the satellite remains

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In motion

Fixed

Synchronized with Earth

None of these

Layer of oil on water in sunlight appears coloured due to

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diffraction of light

dispersion

interference of light

polarization of light

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