Question # 1

The proportion of crystalline to amorphous regions in a polymer depends on its

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Chemical composition

Molecular arrangement

Physical state

Chemical composition and molecular arrangement

What is the minimum number of thermodynamic parameters required to specify the state of gas system.

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1

2

3

Infinite

In scientific notation 0.0003 can be written as.

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3 x 10⁴

3 x 10^-4

3.0 x 10³

3.0 x 10^-3

What is the mean free path in a gas.

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The distance travelled by a molecule before hitting a wall

the average distance travelled by a molecule in one second

the average distance travelled by molecules in one second

The root mean square velocity

The minimum velocity needed to put a satellite into the orbit

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Terminal velocity

Escape velocity

Critical velocity

Linear velocity

Velocity of sound in air at a given temperature.

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Increases with increase in pressure

Decrease with increases in pressure

Is independent of pressure

Becomes quadruples

Because of second law of thermodynamics about the direction of energy flow what is possible.

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Heat

Light

Energy

life

Who studied freely failing bodies using modern scientific method.

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Galileo

Issac newton

Abert Einstein

Alkundi

The long distance transmission of electrical energy is done at.

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High potential and low current

High potential and highs current

Low potential and high current

Low potential and low current

An object gain excess negative charge after being rubbed against another object which is.

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Neutral

Negatively charged

Positively charged

either a, b, or c

The specific heat of liquid

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Decreases with temperature

Increases with temperature

Remains constant with change in temperature

Increases with pressure

To reduce spherical aberration in optical instruments which of the following should be used.

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Plano convex lenses

Concave lenses

Spherical mirrors

Plane mirrors

Which of the following is the cause of failure of a lens to form a sharp and district image of a white object.

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Spherical aberration

Chromatic aberration

Distortion

Astigmatism

What is a thermal properly of a material that determines the quantity of energy required to change the phase of a unit mass of that substance.

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Specific heat

Latent heat

Internal energy

Specific energy

In which process the passage of an electric current through a conductor releases heat.

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Joule heating

Ohmic heating

resistive heating

All of these

A charge less region which separates p-type and n-type semiconductors in a p-n junction is known as.

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Polar region

Null region

Depletion region

Neutral region

If the resultant of two forces, each of magnitude F have the magnitude F, angle between the forces will be.

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30^o

80^o

90 ^o

120 ^o

Which of the following phenomenon occurs when two sound waves of equal amplitude and different frequencies travel through the same region.

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Doppler's effect

Resonance

Beats

Echo

The change in wavelength of an X-ray when scattered from an electron is called.

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Compton shift

Doppler shift

Stefan's law

Fraunhofer lines

An object is -14 cm in front of a convex mirror The image 5.8 cm behind the mirror. What is the focal length of the mirror.

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-4.1 cm

-8.2 cm

- 9.9 cm

-20 cm

The line passing symmetrically though the optical center of the lens is.

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Focal plane

Principal focus

Principal axis

Focal length

Which of the following quantity is zero about the centre of mass of baody.

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Mass

Acceleration

Moment

Angular momentum

X-rays are good for imagining

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Tendons

Brain

Bones

Heart

In an electronic transition atom cannot emit

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Gama rays

Visible rays

Infrared rays

Ultraviolet rays

At high frequency the current through a capacitor will be

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Small

Zero

Large

Infinity

A given mass of air occupies 12 m2 at normal atmospheric pressure if the pressure is increased to 4 times the original value without changing the temperature what volume will the air occupy.

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3 cm3

6 cm3

9 cm3

12 cm3

What happens to the intensity or the brightness of the lamps connected in series as more and more lamps are added.

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Increases

Decreases

Remains the same

Cannot be predicted

In which form energy is stored in acondenser.

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Electric energy

Potential energy

Kinetic energy

Magnetic energy

A logic circuit with one input and one output that inverts the input signal at the output is.

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AND gate

NOT gate

OR gate

NOR gate

The band width of an audio amplifier is.

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10 Hz to 10 kHz

20 Hz to 54 Hz

20 Hz to 20 kHz

20 Hz to 60 kHz

The actual gas can behave like an ideal gas at

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Low density and high pressure

High density and high pressure

Low density and low pressure

High density and low pressure

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