Question # 1

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

Electromagnetic -radiation means:

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Photons

protons

Electrons

Mesons

None of these

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Si units of time period is

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second

hertz

revolution

vibration/sec

Distance covered by a freely falling body in 2 sec will be

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4.9 m

19.6 m

29.2 m

44.1 m

According to the Bernoulli's equation, where the speed of the fluid is high, the pressure will be

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low

zero

high

all of them

the current is pass through the straight wire. The magnetic field established around it has its lines of force:

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Circular and endless

Oval in shape and endless

Straight

Parabolic

All are true

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

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Transformer

AC generator

Alternator

Dynamo

SI unit of impedance is

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hertz

henry

ampere

ohms

The phase determines the

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displacement

amplitude

frequency

state of motion of vibrating body

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 heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

The square of 0.4 is:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

In the expression of force experienced by electron, the direction of both v and B are

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parallel

zero

perpendicular

none of them

Absolute zero is considered as that temperature at which:

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All liquid become gases

All gases become liquid

Water freezes

None of these

The rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

Change in momentum is one second is called:

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Impulse

Force

Energy

Work

Wien's constant is measured in:

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Metre per kelviin

Metre kelvin

Kelvin per meter

Joules

Dynes

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

A ball is dropped from a height of 4.2 meters. To what height will take it rise if there is no loss of KE after rebounding?

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4.2 m

8.4 m

12.6 m

none of these

When a body moves to and fro motion, this type of motion is called

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translatory motion

circular motion

oscillatory motion

all of them

The work is stored in the inductor as

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Electric potential energy

Elastic potential energy

Magnetic energy

Absolute potential energy

Referring to the above figure, we can say that of all the elements, the most stable element is

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Phosphours

Iron

uranium

Lithium

Bismuth

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

Acceleration of a body is negative if the velocity of the body is

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constant

increasing

decreasing

none of them

The field around a moving charge is called

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magnetic field

conservative field

non-conservative field

none of these

How many number of anodes used in electron gun

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one

two

three

six

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