Question # 1

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

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energy bands

energy shells

states

all of them

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

Area under the force displacement graph gives

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Power

Work

Heat

Energy

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

When the pn-junction is connected reversed biased, its resistance is of the order of

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few ohms

few kilo-ohms

few mega-ohms

few mili-ohms

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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1.66 m

1.0 m

0.66 m

2.66 m

When a body moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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100 J

1.6 x 10^-17J

100 eV

1.6 x 10^-17eV

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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pair production

photoelectric

Compton effect

None of these

The transition from solid state to liquid state is:

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Abrupt

Slow

Continous

Discontinous

Both (A) and (D)

The _____ viscous the medium is _____, is the value of terminal velocity of the droplet:

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More, lesser

Lesser, more

Both A and B

Lesser, lesser

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

An compared to solid matter, a crack or an air bubble allows:

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Great amount of X-rays to pass

Smallast amount of X-rays to pass

Very samall amount of X-rays to pass

Any of these

None of these

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

Electromagnetic radiation or photons interact with matter in

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two distinct ways

three distinct ways

four distinct ways

five distinct ways

The R₁= infinity and R₂= 0, then the gain of non-inverting amplifier is

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zero

infinity

one

any one of these

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

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Equal to

Greater than

Smaller than

None of these

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

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

A grating with high resolving power can distinguish _______ difference in wavelengths :

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Smaller

Larger

Zero

None of these

An L-R circuit has R = 10 Ω and L = 2 H. If 120 V, 60 Hz A.C. voltage is applied, then current in the circuit will be

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0.32 A

0.16 A

0.48 A

0.80 A

The vector is space has:

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One Component

Two Compnents

Three Components

Non of these

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

Electrostatics is the branch of physics which deals with the study of electro charges:

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At rest

At rest under the action of electric forces

In motion under the action of electric forces

In motion

At rest under the action of nuclear forces

The device in which induced emf is statically induced emf is:

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Transformer

AC generator

Alternator

Dynamo

The work done by a force keeping an object in circular motion with constant speed is:

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Zero J.

0.1 J

1 J

0.01 J

The work done in 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

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