Question # 1

The value of E₀in coulomb's law is:

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9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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Wien's constant

Stefen's constnat

Planck's constant

Boltzmann's constant

None of these

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

If one end of a rubber cord is fixed with a support and the other end is wiggled by hand, the waves generated on the card are:

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Stationary waves

Transverse waves

Both of these

None of these

The number of vibration in two seconds can be expressed as

______ of frequency of vibration is f:

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f

2 f

3 f

1/2 f

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

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9.8

24 x 10¹⁹

24 x 10⁴²

24 x 10^-44

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

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

The basic circuit element in D.C. circuit is:

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A capacitor

A resistor

An inductor

Both (A) and (C)

Both (A) and (B)

Field lines are closer to each other in the region where the field is:

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Stronger

Weaker

Much weaker

Absent

None of these

The waves which propagate through the oscillations of material particles are known as:

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Mechanical waves

Electromagnetic waves

Any of them

None of them

Pressure exerted by a gas is

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Independent of density of the gas

Inversely proportional to the density of the gas

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

Rate of diffusion is

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Faster in solids than in liquids and gases

Faster in liquids than in solids and gases

Equal to solids, liquids and gases

Faster in gases than in liquids and solids

The lasing or active medium in He-Ne laser discharge tube is:

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Nitrogen

Helium

Hydrogen

Neon

None of these

According to the Bernoulli's equation, where the speed of the fluid is high, the pressure will be

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low

zero

high

all of them

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

Total number of base units are

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Three

Five

Seven

Nine

Velocity of a body changes if

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direction of the body changes

speed of the body changes

neither speed nor direction changes

either speed or direction changes

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

The speed of sound in a medium depends on

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The elastic property but not on the inertia property

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

A typical four stroke petrol engine undergoes how many successive processes in each cycle

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one

two

three

four

When two waves with same frequency and constant phase difference phase difference interfere

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There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

If force and displacement are in opposite direction, the work done is taken as:

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Positive work

Negative work

Zero work

Infinite work

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

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negative charges

positive charges

protons

electrons

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