Question # 1

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

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Fringe width will decrease

Fringe width will increase

The fringe width will remain unchanged

Fringes will becomes less intense

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

A particle is moving in a uniform magnetic filed, 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

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

Which one of the following phenomena is not explained by Huygen's construction of wavefront?

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Refraction

Reflection

Diffraction

Origin of spectra

The angle between rectangular components of a vector is

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0°

60°

90°

120°

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

A p-n junction has a thickness of the order of:

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1 cm

1 mm

10^-6cm

10^-12cm

When a hydrogen atom is bombarded, the atom is excited to the n = 4 state of hydrogen atom. The energy released when the atom falls from n = 4 state to the ground state is

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1.275 eV

12.75 eV

5 eV

8 eV

Centre of mass is a point

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Which is geometric centre of a body

From which distance of particles are same

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

If the earth were to rotate faster, than its present speed the weight of an object will

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Increase at the equator but remain unchanged at the poles

Decrease at the equator but remain unchanged at the poles

Remain unchanged at the decrease but decrease at the poles

Remain unchanged at the equator but increase at the poles

When the length of a microscope tube increases, its magnifying power

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Decreases

Increases

May increases or decreases depending on the observer and the place of observation

Does not change

Which quantity is increased in step-down transformer?

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Current

Voltage

Power

Frequency

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