Question # 1

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

In full wave rectification, simultaneous action is that:

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Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

The waveform of alternating voltage is a:

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Square

Rectangular

Saw-tooth

Sinusoidal

None of these

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

Bernoulli's equation is based upon law of conversation of

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mass

momentum

Energy

None

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

In the formula for finding the speed of waves in the spring, unit of m in SIn units is:

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kg

kg-meter

kg/meter

Meter/kg

Which of the following is conserved when light waves interfere

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Intensity

Energy

Amplitude

Momentum

The modulus of rigidity of a liquid is

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Zero

1

Infinite

None of these

What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?

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12

6

3

2

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

If the two reflected waves reinforce each other then the firm as seen from the parallel beam of monochromic light will look

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Dark

Bright

Sometimes bright and dark

None of these

A body is moving with a uniform speed along a straight line.Its angular momentum with respect to a fixed point away from the line

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Increases as the body moves away from the point

Decreases as the body moves away from the point

Is zero

Is constant and does not depend on the position of the body

An un-power and un-guided missile is called a

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rocket

ballistic missile

guided missile

none of them

A plane wavefront is that which has source

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Nearest

Distant

Near

None of these

The fundamental frequency of a closed organ pope is 50 Hz. The frequency ofsecond over tone is

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100hz

150hz

60hz

250hz

The SI unit of momentum is

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Kgms^-1

Kgms^-2

NS

A and C

A particle of mass 'm' at rest is acted upon by a force 'P' for a time 't' its kinetic energy after an interval 't' is

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P²t²/m

P²t²/2m

P²t²/3m

Pt/2m

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