Question # 1

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

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

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

A 1000 Kg car travelling with a speed of 90 km/hr turns around a curve of radius 0.1 km. The necessary centripetal force comes out to be:

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8.1 X 10⁷N

625 N

6250 N

None of these

The free electrons in metals:

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Are in random motion and their speed depends upon temperature

Move in particular direction

Move with speed of light

Move such that their speed does not depend on their temperature

None of these

Two sources of sound are said to be coherent if

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The produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase difference all instant of time

Free oscillations are always produced by:

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An applied force

Gravitational force

Restoring force and inertia

Inertia only

The speed of sound in a medium depends on

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The elastic property but not on the inertia property

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:

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800^oC

500^oC

300^oC

100^oC

None of these

The work done moving a body between two points in a conservation field is independent of the:

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Direction

Force applied

Path followed by the body `

Power

The smallest three dimensional basic structure in a crystalline solid is called

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lattice point

crystal lattice

cubic crystal

unit cell

In a uniform circular motion

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Velocity and acceleration remain constant

Kinetic energy remain constant

Speed and acceleration change

Only velocity change acceleration remain constant

First law of thermodynamic is generalization

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Law of conservation of mass

Law of conservation of energy

Law of heat exchange

None of these

If the diameter and mass of the earth become two times their present values, then the weight of an object on the surface of the earth will

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Remain unchanged

Become half

Become one fourth

Be doubled

The splitting of white light into several colors on passing through a glass prism is due to

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Refraction

Reflection

Interference

Diffraction

When the object is closer to eye or near point, the image becomes

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Sharp

Clear visible

Blurred

None of these

A certain force F increases the length of a wire by 1 mm. The force required to increase its length by 2mm is

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2 F

4 F

8 F

16 F

No body begins to move or comes to rest of itself said by

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Thomos Young

Abu Ali Sena

Newton

None of these

In case of destructive interference of two waves, the amplitude of the resultant wave will be_______either of the waves:

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Greater than

Smaller than

Equal to

none of these

In compound microscope image formed is

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Real erect and diminished

Virtual inverted magnitude

Real inverted and magnified

Virtual inverted and magnified

The magnetism produced by electrons within an atom can arise from

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electrons orbiting the nucleus

both motions

none one these motions

Nuclear fission experiments show that the neutrons the uranium nuclei into two fragment of about the same size. This process is accompanied by the emission of several:

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Protons and positrons

𝛼 −partilces

neutrons

Protons and 𝛼 −partilces

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