Question # 1

The year when A.H. compton was awarded Nobel Prize is:

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1923

1927

1931

1935

None of these

Which of the following changes at an antinode in a stationary wave?

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Density only

Pressure only

Both pressure and density

Neither pressure nor density

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

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Non-uniform density

uniform density

high density

low density

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

In free space, the speed of electromagnetic waves is

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3 x 10⁸ms^-1

3 x 10⁶ms^-1

4 x 10⁷ms^-1

3 x 10⁹ms^-1

The equation of continuity

A₁V₁= A₂V₂is for the flow of

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an ideal fluid

an incompressible fluid

a non visconcous fluid

all of the above

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

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Yellow

Orange red

Dull red

White

Cherry red

The center of mass of a sphere lies at:

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The axis of the sphere

Circumference of sphere

Center of the sphere

None of them

The SI unit of magnetic induction is

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Weber

Weber/meter

Henry

Tesla

In which process the change in internal energy of the system is zero:

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Isochoric process

Isobaric process

Adiabatic process

Isothermal process

In slow Compression of a gas in a cylinder is reversible as the compression can be changed to expansion by

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Rapid decreasing the pressure

Slowly decreasing the pressure

Extremely decreasing the pressure

None of these

The size of the molecules in comparison with the separation between the molecules is

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Small

Very small

Extremely small

None of these

The study of nature has been classified into branches are:

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Two

Three

Four

None of these

When a germanium atom is doped with phosphorous atoms it becomes

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N-type semiconductor

p-type semiconductor

An insulator

None of them

During a negative β-decay

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An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present within the nucleus is ejected

A part of binding energy of nuclei is converted into electron

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

Moment of inertia of thin rod is

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1/2 mL²

1/6 mL²

1/12 mL²

1/15 mL²

In deformation of the material, the potential energy of the molecules due to displacement from their mean positions is

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Lost

Gained

No lost no gain

None of these

Torque is the resultant of

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Dot product of force and moment arm

Simple product of force and moment arm

Cross product between position vector and force

Addition of force and moment arm

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