Question # 1

The value of the plank's constant 'h' is given by

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1.6 x 10^-19J

1.67 x 10^-27Kg

6.63 x 10³⁴Js

6.63 x 10^-34Js

At high altitude the blood oozes out of the nose and ear because

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The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decrease there

The density of blood decrease at high altitudes

Which of the following is/are example/s if mechanical waves i.e. waves generated in _______:

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Rope

Coil of spring

Water

All of them

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

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2 m

1 m

0.5 m

4 m

Blood is an

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Compressible fluid

incompressible fluid

hard

none of them

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

The R₁= infinity and R₂= 0, then the gain of non-inverting amplifier is

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zero

infinity

one

any one of these

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

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

The forbidden energy band gaps in conductors semiconductors and EG,EG₂ and EG₃respectively The relation among them is

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EG₁ = EG₂ = EG₃

EG₁ < EG₂ < EG₃

EG₁ > EG₂ > EG₃

EG₁ < EG₂ > EG₃

The function of colimator is

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To converge the incoming rays

To make the parallel rays from source

In which the source of light is kept

None of these

Debye is the unit of

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Magnetic dipole moment

Electric dipole moment

Density

RMS velocity

The number of electrons emitted depend upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

The total magnification of a combination of two lenses having individual magnification M1 and M2 is

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M₁+ M₂

M₁M₂

M₁- M₂

M₁/ M₂

How many ways vector can be represented

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Bold letter

Arrow over capital letter

Graphically

All ow them

The body is in equilibrium when it is in a state of

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Accelerated motion

Uniform motion

Rest or uniform motion

None of these

The ultimate tensile strength of the material can be regarded as

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Maximum strength

Nominal strength

No strength

None of these

For which color of light the refractive index of glass is larger

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Red

Green

Blue

Violet

A gas exerts pressure on the walls of the container because molecules

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Have finite size

Obey Boyle's law

Have momentum

Collide with one another

The efficiency of half wave rectifier is:

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25.6%

1.2%

40.6%

66.6%

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