Question # 1

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

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adiabatically

isothermally

isochorcally

isobarically

transverse wave motion is possible in:

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Air

A mixture of NH₃and O₂

Strings

All of these

The consumption of energy by a 1000 watt heter in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

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

The string of a simple pendulum should be:

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Heavy

Extensible

In-extensible

None of these

Two vectors to be combined have magnitudes of 60 N and 35 N. Pick the possible answer:

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100 N

70 N

20 N

Zero

A vector of magnitude 5 N is added to a vector of magnitude 8 N while the orientations are changeable. Range of their possible sum will be very from:

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Zero to 3 N

1 N to 13 N

13 N to 3 N

None of these

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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Focus

Optical center

Edges

None of these

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

The photon of radio-waves has energy of about

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1 Me V

1 Ke v

10^-10e v

10¹⁰e v

The reason why weight exists is that

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the earth exerts gravitational force on objects

both the earth and any object on it has mass

gravity exists

All of them

Which branch of physics deal with the structure and properties of solids

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Atomic Physics

Plasma Physics

Molecular Physics

Solid state Physics

The SI unit of power is terms of base unit is

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Watt

Kgm²s^-3

Kgm^-2s^-3

Kgm²s³

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

The two forces of a couple do not follow the rule that

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They act on the same angle

They act in the opposite directions

They have same directions

They cancel out each other

Mirage is a phenomenon due to

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Reflection of light

Refraction of light

Total internal reflection of light

Diffraction of light

Stress that induces a change in the shape of the body is named as

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Tensile stress

Volumetric stress

Shear stress

None of these

The approximate efficiency of Nuclear reactor

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33%

32%

39%

45%

To decrease timing uncertainly

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Increase number of vibration

Decrease number of vibration

Increase length of pendulum

Decrease length of pendulum

The uranium Nucleus 𝟐𝟑𝟖 𝑼 undergoes successive decays, emitting respectively 𝑎 − 𝒓𝒂𝒚,𝖰 − 𝒓𝒂𝒚 𝒂𝒏𝒅 − 𝒓𝒂𝒚𝒔. What is the atomic number and atomic mass of the resulting nucleus:

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90, 238

91, 234

92, 236

92, 238

Which of the following is unit of energy

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g cms^-2

Kilowatt

Watt day

Js^-1

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