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

The combined effect of resistance and reactance in a.c. circuit is called

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conductance

resistance

impedance

choke

The product of cross-sectional area of the pipe and the fluid speed at any pint along the pipe is

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very high

very low

constant

zero

Crests and troughs are formed in:

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Longitudinal waves

Transverse waves

Both of these

None of these

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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photo diode

light emitting diode

photo voltaic cell

all of them

When a body moves to and fro motion, this type of motion is called

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translatory motion

circular motion

oscillatory motion

all of them

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

Density of fluid is defined as:

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Its volume to mass ratio

Product of volume and mass

Its mass of volume ratio

None of these

Electromagnetic -radiation means:

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Photons

protons

Electrons

Mesons

None of these

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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3525.0 volts

35.35 volts

353.5 volts

3.535 volts

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

Equal charges are given to two spheres of different radii,The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

The property of bending of light around the obstacle is known is

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Interference

Polarization

Diffraction

None of these

An Earth satellite in a circular orbit of 384000 km. What is its velocity in that orbit take me = 6.0 × 1024 Kv R_e = 64000 km

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2.57 kms^-1

1.1 kms^-1

1.01 kms^-1

1.07 kms^-1

The internal energy is similar to the

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Gravitational potential energy

Kinetic energy

Mechanical energy

None of these

The centre of gravity of a body of an irregular shape lies

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At its centre

inside the surface

At the intersection of medians

All of these

Unit of dielectric constant of medium is

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Coulombs /Newton-meter

Newton-meter²/coulomb²

coulomb²/ (Newton-meter)²

None of the above

Which of the following phenomenon is not application of Bernoulli s equation

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Swing in cricket ball

Flying of airplane

Working of carbonator

Beats

When m₁>> m₂and V₂= 0, the result of their velocities are

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According to the first condition for equilibrium, the vector sum of all the forces acting on a body must be equal to

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The maximum value

The minimum value

A negative value

Zero

If a lens is cut into two piece perpendicular to the principal axis and only part is used the intensity of the image:

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Remains same

1/2 times

2 times

Infinite

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