Question # 1

The passage of current is accompanied by a magnetic field in the surrounding space:

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Always accompanied

Sometimes accompanied

Never accompanied

Any of above

None of these

To hear a clear echo, the reflecting surface must be at a minimum distance of

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10 m

16.5 m

33 m

66 m

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

The practical application of the phenomenon of Mutual induction is

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Transformers

Generator

Motor

All of these

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

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

If the ends of a wire are connected to a battery an electric field E will be set up at:

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The ends of the wire only

Mid points of the wire only

Every point within the wire

At nodes only

Both (B) and (D)

Change in momentum is one second called.

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Impulse

Force

Energy

Work

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?

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1 MHz

10 Hz

1 GHz

100000 Hz

A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain drops are falling vertically down. To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west to east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

In SHM, there is always a constant ratio between displacement if body and its:

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Velocity

Period

Mass

Acceleration

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

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adiabatically

isothermally

isochorically

isobarically

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

The SI units of momentum is

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kg m s^-2

kg ms

kg m s²

N-s

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

A rocket carries its own fuel in the form of

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liquid only

liquid or solid

liquid and solid

liquid or solid and oxygen

Area under the force displacement graph gives

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Power

Work

Heat

Energy

The reverse saturation current in a PN junction diode is only due to

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Majority carriers

Minority Carriers

Acceptor ions

Donor ions

SI unit of frequency is

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second

hertz

revolution

vibrations/sec

A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.

if centripetal acceleration is 9.8 m/sec², then its angular velocity in rad/sec is:

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22/7

7

14

21

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

Generally a temperature scale is established by

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one fixed point

two fixed point

three fixed point

four fixed point

In a charged capacitor the energy is stored in

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Both in positive and negative charges

Positive charges

The edges of the capacitor plates

The electric field between the plates

A body moves a distance of 10 m among a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which the force makes with the direction of motion of a body is:

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0°

30°

60°

90°

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

The graph showing the variation of displacement with time is a

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Sine curve

Straight line

Parabola

None of these

When there is no relative motion between the magnet and coil, the galvanometer indicates:

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No current in circuit

An increasing current

A decreasing current

Either B or C

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