Question # 1

Which law states that a change in the internal energy of a closed thermodynamic system is equal to the difference between the heat supplied to the system and teh amount of work by the system on the surrounding.

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Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Who proposed the temperature equalization mechanism of a body by thermal radiations with that of its surroundings.

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Pierre Provost

Robert Brown

Albert Einstein

Issac Newton

What is the heat required in Kilo joules when the temperature of 100 g of copper is raised thgough 20 K/. Specific heat capacity of copper is 0.4 x 10-3 kg -1 k-1

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0.4 kj

0.8 kj

400 kj

800 kj

Which kind of thermodynamic process is defined as with no heat transfer into or out of a system i.e. Q =0

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Isobaric process

Isochoric process

Isothermal process

Adiabatic process

The radius of first Bohr's orbit for hydrogen atom is.

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0.53 m

0.53 nm

0.053 nm

0.53 mm

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

When an object moves with a very high speed the length in the direction of motion.

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Contracts

Expands

Remains the same

Becomes infinity

Reversible alternation of the form of dimensions of a solid body under stress and strain is called.

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elastic limit

Plastic limit

elestic deformation

Plastic deformation

What is the power factors of wattles current.

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Infinity

Unity

0.5

Zero

Davison and Germer received the Nobel Prize in

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1929

1931

1935

1937

A pulse on the string is inverted when it is reflected from

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Free end

Fixed end

Either of the two

Rubber cord

Transistors with various combinations are widely used as switches in.

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electric generators

Rectificers

Amplifiers

Computers

Birds planes and boats are streamlined to reduce

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Turbulence

Thrust

Drag

Lift

High concentration of red blood cells increases the viscosity of blood from

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2 -3 time's that of water

3-4 times that of water

3 - 5 times that of water

4 -5 times that of water

Thermal conduction in metals differs from thermal conduction in insulators,. The reasons for this is that , in metals heat can be transported by.

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Electrons

Lattice vibrations

Photons

Positive ions

An inductor may store energy in

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Its magnetic field

Its electric field

Its coils

A neighboring circuit

A body of mass 2 kg is suspended from the celling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be.

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9.88 N

19.8 N

29.4 N

39. 2 N

Which is the famous standard model of the universe.

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the big bang

Casmos

Astronaut

The small stap

A stretched wire with clamped ends has a fundamental frequency of 1,000 Hz. What will be the new fundamental frequency if tension in the wire is increased by 2%

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980 Hz

1,000 Hz

1,010 Hz

1,020 Hz

A gama ray of energy 1900 MeV is absorbed by

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Proton antiproton pair

Electron positron pair

Producing heat in the substance

The orbit

When a pentavalent material like arsenic is added to a tetravalent material such as germanium, we get a.

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n-type material

p -type material

diode

super conductor

linear magnification is the ratio between the

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Distances of object and image from mirror

Distances of object and image from the focal point

Distance of image and object from the mirror

Distance of image from object and the distance of object from mirror

The moment of linear momentum is called.

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Torque

Couple

Impulse

Angular momentum

An object at the end of a spring oscillates with SHM of angular frequency 2 rad s-1 What is the period of oscillation.

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0.32 s

0.50 s

0.80 s

3.1 s

The dimensions of viscosity are

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[MLT-1]

[MT-2]

[ML-1T-1]

[ML2T-1]

On which of the following parameters capacitance does not depend upon.

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Area of the plates

Medium between the plates

Distance between the plates

Nature of material for plates

Which of the following is standard scale of temperature

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Mercury scale

Platinum resistance scale

Gas scale

Alcohol scale

Electricity is transmitted at high voltage rather than at low voltage because.

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It is generated at high voltage

It is safer

It requires less insulation

It wastes less energy

Generally, electrical resistivity of intrinsic semiconductors decreases with increasing.

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Pressure

Volume

Temperature

Density

When two identical waves are superimposed the velocity of the reasultant wave.

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Increases

Decreases

Become zero

Remain unchanged

The sum of the positive and negative peak values is known as.

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Peak value

Average value

Instantaneous value

Peak to peak value

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