Question # 1

When the total displacement is divided by total time taken, we get:

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Velocity

Average speed

Average velocity

None of these

A charged particle moving at right angle to the magnetic field will experience

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minimum force

maximum force

zero

moderate force

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

When a platinum wire is heated, it appears yellow at

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1600°C

900°C

1100°C

1300°C

The number of isotopes of hydrogen are

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2

1

3

4

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

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0.1 V

8 V

2 V

0.5 V

Conventional the angular Velocity is Directed at an angle of:

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of above

The quantity having dimension of ML²T⁰²will earth is:

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80 sec

500 sec

1.802 X 10⁴sec

Aerophysics

During the whole carnot cycle

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Thermal equilibrium is maintained

mechanical equilibrium is maintained

both the thermal and mechanical equilibriumis maintained

both the thermal and mechanical equilibrium is not maintained

One radian is

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Greater than one degree

Less than one degree

Equal to one degree

None of these

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

The SI unit of coefficient of viscosity is

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kg m^-1s^-1

Nm²g²

kg m²s^-2

kgms^-2

Measurement of a standard metre in terms of the wavelength of red cadmium light is

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1,563,163.5

1,553,363.5

155,553.5

1,553,163.5

A listener observes the frequency “f” of stationary source. If it move toward with 3 times of velocity of sound. Then the apparent frequency of the sound will be

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f

3f

f/2

4f

If the body changes its velocity uniformly from rest, then the velocity-time graph will be a straight line

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parallel to time-axis

parallel to velocity axis

inclined to time axis

inclined to velocity-axis

Coin of radius R is beaten uniform to make a disc of radius 2R.Its moment of inertia.

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Decreases

Increases

Remains the same

Decreases or increases depending on the actual value

In case of linear deformation, the ratio of the tensile stress to the tensile strain is called

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Young's modulus

Bulk modulus

shear modulus

all of them

A stone is dropped from rest from the top of a tower 19.6m high.The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

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9.8 m

14.7 m

4.9 m

19.6 m

If (a x b) points along positive z-axis,then the vectors a and b must lie in.

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yz-plane

zx-plane

xy-plane

None of the above

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

all of them

A rain drop of radius r falls from a certain height h above the ground. The work done by the gravitational force is proportional to

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r

r²

r³

r⁴

In YDS experiment, at the center of screen is formed a:

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Dark fringe

Bright fringe

No fringe at all

None of these

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