Question # 1

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

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Frequency of beat changes with time

Frequency of beat changes with location of observer

All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves

Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves

Amorphous solids are also called as

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crystalline solids

polymeric solids

glassy solids

any one of them

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

In a surface tension experiment with a capillary tube water rises up to 0.1 m. if the same experiment is repeated on an artificial satellite, which is resolving around the earth, water will rise in the capillary tube up to a height of

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0.1 m

0.2 m

0.98 m

Full length of the capillary tube

Matter is made up of very tiny particles called

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Atoms

Molecules

Ions

None of these

On heating, glass gradually softens into a paste like before it becomes a very viscous liquid at almost

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600°C

7600°C

800°C

900°C

Aluminum is a:

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Good insulator

Bad conductor

Both (A) and (B)

Excellent conductor

Semiconductor

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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Wavelength

Frequency

Energy

Temperature

All of these

The property of light which does not change with the nature of the medium is:

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Frequency

Amplitude

Wavelength

None of these

The linear acceleration of the particle of mass m describing a horizontal circle of radius r with angular speed ω is

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rω

ω/r

rω²

r²ω

In YDS experiment, data given isλ= 500 nm, L = 100 cm,Δy comes out to be

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0.5 cm

0.5 mm

0.5 nm

0.5 m

How many the multiplications of vectors are ?

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Three

Two

One

None of these

In the study of interference and diffraction, we consider

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plane waves

plane wavefronts

both of them

none of them

Huygen's wave front which sends out secondary wavelets with a speed equal to

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Speed of propagation of the wave

Speed of propagation greater than wave

Speed of propagation less than the wave

None of these

In Milikan's experiment, we find the e/m for

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Atom

Electron

Proton

Neutron

Which of the following statements about angular momentums is correct?

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Angular momentum remains conserved

Angular momentum is the product of moment of inertia and angular velocity

Moment of inertia is directly proportional to angular momentum for constant angular speed

All of these

In a full wave rectifier:

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DC current is twice that of half wave rectifier

DC pulses are twice per cycle that of half wave rectifier

DC voltage is twice that of half wave rectifier

All are correct

The speed of light in a medium of refractive index 1.5 is

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3 x 10⁸ms^-1

4.5 x 10⁸ms^-1

2.0 x 10⁸ms^-1

None of these

Inspite vibrations the force which hold the atoms in their ordered form is

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Vander vall force

Cohesive force

Adhesive force

None of these

Diameter of the nucleus is of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

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