Question # 1

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

When either L or C is increased, the resonant frequency of the RLC series circuit

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Increases

Decreases

Remains the same

Becomes zero

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

Zero

The unit of induced emf is:

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Volt

Nm/As

Joule coul^-1

Both A and C

All of these

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

In the above figures, tell which set is graphs shows that a body is moving uniform velocity:

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(i) and (ii)

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

Which of the following quantity for particle executing SHM is non-zero at mean position

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Force

Acceleration

Velocity

Displacement

A rotating body tends to be slower, when its angular acceleration is:

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Positive

Negative

Zero

Infinity

The equations of angular motion only hold true when the axis of rotation is

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Not fixed

Fixed

Fixed in some equations

None of these

A string vibrates in 1 loop has frequency 25 Hz if it moves in 2 loops its frequencywould be:

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25 Hz

50 Hz

12.5 Hz

5Hz

A tall chimney has the advantage/advantages

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Reduce top pressure

Force

Upward flow of smoke

All of these

Pick out the wrong pair:

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Charge-coulomb

Temperature-thermometer

Pressure-barometer

sp.gravity-hygrometer

A sun rise or sun set the sun looks reddish because

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

In Newton's rings the thickness of air film at the point of contact is

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maximum

minimum

equal to wavelength

zero

Displacement is a physical quantity, which is a

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Scalar

Vector

Variable quality

None of these

The unit of surface energy per unit area may be expressed as

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Nm^-2

Nm^-1

Nm

Nm²

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

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Critical temperature

Temperature of vaporization

Melting point

Both A and C

Both A and B

Length can not be measured by

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Fermi

Debye

Micron

Light year

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

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