Question # 1

Electron gun consist of

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three anodes

heating cathode

three anodes

three anodes , heating cathode, grid

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

Work done along a closed path in a gravitational force is:

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maximum

Minimum

Zero

Unity

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

Substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

Shock absorber of the car is an example of

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resonance

forced oscillations

interference

damped oscillations

What are the SI base units of the coefficient of viscosity

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Kg m s^-2

kgm² s^-2

Kg m s^-1

kg m^-1s^-1

The time taken to complete one vibration is called:

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Frequency

Amplitude

Time

Time period

The horizontal range of projectile, at a certain place, depends upon

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the mass of the projectile

velocity of projection

angle of projection

angel as well as velocity of projection

The system international (SI) is built from __________ kind of units

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Two

three

four

five

The critical temperature of aluminum is

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1.18 K

4.2 K

3.72 K

7.2 K

The fluid which is incompressible and have streamline flow is called _________ fluid

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Ideal

Viscous

Non ideal

None of these

Wb/m² is equal to

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Henry

Watt

Tesla

Dynes

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

Human body is composed of particles to produce electric force are

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Atoms

Molecules

Charges

All of them

The motion of a projectile is

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one dimension

two dimensions

three dimensions

four dimensions

The velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s.The velocity 3s before in m/s is:

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8

4

6

7

In case when there is no total displacement and average velocity, then the motion is described by

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Variable velocity

Instantaneous velocity

Initial velocity

None of these

A semiconductor in its extremely pure form in known as

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Extrinsic semiconductor

Intrinsic semiconductor

Both a and b

None of these

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