Question # 1

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

In free space, the speed of electromagnetic waves is

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3 x 10⁸ms^-1

3 x 10⁶ms^-1

4 x 10⁷ms^-1

3 x 10⁹ms^-1

Wien's constant is measured in:

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Metre per kelviin

Metre kelvin

Kelvin per meter

Joules

Dynes

Which one of the following is dimensionless.

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Acceleration

Velocity

Density

Angle

transverse wave motion is possible in:

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Air

A mixture of NH₃and O₂

Strings

All of these

In SHM, the acceleration is ______ when velocity is _____:

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Zero, smallest

Smallest, zero

Zero, zero

Zero, greatest

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

Referring to above figure, current in coil P falls from its maximum value to zero:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

The device which allows only the flow of an A.C. through a circuit is

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Capacitor

Inductor

D.C. motor

Battery

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

The potential energy per unit charge is the unit of

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Flux

Electric intensity

Potential difference

None of these

Phase change of 180° is equivalent to a path difference of

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2λ

λ

λ/2

λ/4

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory?

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Refraction

Reflection

Diffraction

Formation of spectrum

A steel wire 12 mm in diameter is fastened to a log and them pulled by a tractor. The length of stire between the log and tractor is 11 m. The force of 10,000 N is required to pull the log. What is stress

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84.46 MPa

85.46 MPa

88.46 MPa

89.46 MPa

The triple point of water is

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100°C

0K

0°C

273.16K

Rudolph clausius gave the quantitative basis for the second law in

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1881

1870

1856

1840

Which of the following is the smallest unit?

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Millimeter

Angstrom

Fermi

Metre

Steradian is an angle of

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One dimensional angle

Two dimensional angle

Three dimensional angle

None of these

Temperature of a system is defined as

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Initial K.E. of its molecules

Instantaneous K.E. of its molecules

Average K.E. of its molecules

All of these

If the acceleration due to gravity is 10 ms^-2 and the units of length and time are changed to kilometer and hour respectively,the numerical value of acceleration is

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360000

72000

36000

129600

The systolic blood pressure comes when

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Vessel collapse

Cutting off the blood flow

None of these

All of these

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