Question # 1

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

The value of relative permittivity of different dielectrics are

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Equal

Different

Greater than one

Smaller than one

Both B and C

The energy of a photon is represented by

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h/c²

h/T

hc²

hf/c²

Physics is one of the branches of:

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Social sciences

Physical sciences

Biological sciences

Abstract art

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

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Longitudinal wave

Transverse wave

No vibration at all

None of them

The life time of metastable state is equal to

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Life time of excited state

Greater than by excited state

Zero

Less than by excited state

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

A flowing liquid possess

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K.E

P.E

Pressure Energy

All

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

Peak value of alternative current is:

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one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

When the speed of a body in a fluid increases then the drag force

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decreases

becomes zero

increases

non of them

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

A reversible cycle is the one in which

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some of the changes are reversible

all of the changes are reversible

all of the changes are irreversible

none of them

Change in momentum is one second is called:

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Impulse

Force

Energy

Work

The instantaneous velocity of a body moving along a circle is directed

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along the radius

along the tangent

away from the circle

none of them

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

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

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

Pressure of a gas at constant volume is proportion to

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Total energy of gas

Average P.E to molecules

Average K.E of molecules

Total internal energy of gas

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

Electric field lines emerge from the charge in:

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of them

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as

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IT = 10^-4G

IT = 10⁵G

IT = 10³G

IT = 10⁴G

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

According to the Bernoulli's theorem the pressure velocity are

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equal to each other

proportional to each other

inversely proportional to each other

none of them

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Two forces of 10N and 8N are applied simultaneously to a body. The maximum value of their resultant is:

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20 N

-2 N

18 N

36 N

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