Question # 1

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

The equation of continuity is

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A₁A_{2 = V}₁V₂

A_1/_V_{1 =}A_2/V₂

_V_1/A₁₌V_2/A₂

A₁_V_{1 =}A₂V₂

The value of the potential difference across the depletion region for the case of germanium is

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0.3 V

0.5 V

0.7 V

0.9 V

The electric field intensity at a point due to a point charge

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Falls off inversely as the distance

Falls off inversely as the square of distance

Remains unchanged with distance

Increase directly as square of distance

A carnot cycle consists of

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One step

two step

three steps

four steps

Current provided by a battery is maximum when

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Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

None of these

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

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outwards

inwards

in either way

none of these

Nucleus of a hydrogen atom may contain:

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One neutron only

Two protons and one neutron

Two protons and two neutrons

Aany of above

One proton only

The SI unit of electric flux is

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Weber

Nm²C^-1

NmC^-1

Nm^-2C

The damping depends upon the

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amplitude

sharpness

both of them

none of them

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

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1840 KeV

1/1840 KeV

1 KeV

920 KeV

Which one of the following could be the frequency of ultraviolet radiation?

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1.0 x 10⁶Hz

1.0 x 10⁹Hz

1.0 x 10¹²Hz

1.0 x 10¹⁵Hz

A certain force gives an acceleration of 2 m/sec2 to a body if mass 5 kg. The same force would give a 29 kg object an acceleration of:

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0.5 m/sec2

5 m/sec2

1.5 m/sec2

9.8 m/sec2

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

Carnot heat engine only used

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isothermal processes

adiabatic processes

both of them

none of them

At the starting point of the free fall motion of an object, its acceleration will be

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maximum

minimum

zero

none of them

The property of fluids due to which they resist their own flow is called:

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Drag force

Surface tension

Viscosity

None of these

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

The maximum stress that a material can withstand, is known as

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plastic point

elastic limit

yield point

ultimate tensile strength

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

The range of projectile is 50 m whenθ is inclined with horizontal at 15°. What is the range whenθ becomes 45°?

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400 m

300 m

200 m

100 m

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

If the value of galvanometer constant k = C/BAN is made small, the galvanometer can be made

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Sensitive

Accurate

Stable

None of these

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

Blood vessels can be stretch like rubber, therefore they are

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rigid

hard

very thick

not rigid

In an A.C circuit with resistor only, the current and voltage have a phase angle of

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90°

0°

180°

none of these

The force acting on a charge moving in a magnetic field

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is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

Newton's first law is also called:

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Law of torque

Law of force

Law of inertia

None of these

We cannot utilize the heat contents of oceans and atmosphere because

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there is no reservoir at the same temperature

there is no reservoir at the temperature lower than any one of two

there is no reservoir at the temperature higher than any one of two

none of them

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