Online Test

Question # 1

A digital multimeter is preferred over ordinary AVO meter because

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No needle is used

Error free reading

No battery is used

None of these

The doped semi-conductors materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

In GM counter the potential difference applied between anode and cathode is

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Slightly greater than that required to produce discharge

Slightly less than that required to produce discharge

Equal to that required to produced discharge

Much greater than required to produce discharge

The number of significant figures in all the given number 25.12.2009,4.156 and 1.257 x 10^-4 is

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1

2

3

4

A proton is assumed to be made up of quarks

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Two up one down

Two down one up

Two up two down

None of these

The magnetic field in the middle of a solenoid due to current is

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weak

strong and uniform

none-uniform

zero

For a moving body. at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing.the retardation is negative

If the body is slowing.the distance is negative

If displacement.velocity and acceleration at that instant are known,we can find the displacement at any given time in future.

Speed of sound is air at 20°C is

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307 ms^-1

315 ms^-1

332 ms^-1

300 ms^-1

The relative permitivity ∈_r for transformer oil is

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2.9

3.0

2.1

2.4

The path described by a projectile is called its

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orbit

trajectory

range

distance

Photocell is a device which converts

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chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

A photon is always considered to be

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At rest

Moving with speed of light

In accelerated form

None of these

The velocity of a body at some particular instant is called

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Initial velocity

Instantaneous velocity

Variable velocity

None of these

The cars usually have cylinders on the crankshaft are

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2

3

4

6

In forward bias the depletion region behaves like

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An insulator

A conductor

A semi-conductor

All of the above

The K.E.of a light and a heavy object is same.Which object has maximum momentum?

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Light object

Heavy object

Both have the same momentum

Data is not sufficient

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

There are earth stations which transmit signals to satellites and receive signals via satellite from other countries are

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200

Over 200

400

500

Surface tension of water is due to

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Inter molecular attractions

Intermolecular spaces

Inter molecular repulsion

None of above

The drift velocity of free electrons in a metallic conductor is

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10^-3 ms^-1

10^-4 ms^-1

10^-5 ms^-1

10^-6 ms^-1

When the torque acting on a system is zero, which of the following will be constant

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linear momentum

angular momentum

impulse

force

The temperature at which the speed of sound becomes double is

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373°C

658°C

1132°C

859°C

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro-magnetic energy

The approximate efficiency of silicon solar cell is

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5 - 10%

9 - 12%

12 - 16%

15 - 18%

The quality of the moving body is called

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Motion

Momentum

Force

None of these

For all the irreversible processes the entropy of the system

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Increases

Decreases

Remains constant

None of these

In nodes, the energy does

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Not remain

Remain upper end

Lower end

Alternate between P.E. and K.E.

The reactance of coil depends upon the

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Frequency of D.C. and inductance L

Frequency of A.C. and inductance L

Frequency of D.C. and current I

None of these

Area between the velocity time graph and time axis is equal to

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Speed of object

Distance covered

Velocity of the object

Acceleration

The internal energy of a mono-atomic ideal gas molecule is

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Partly kinetic and partly potential

Totally kinetic

Totally potential

Neither kinetic nor potential

One gray is equal to

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1 N kg^-1

1 dyne kg^-1

1 J kg^-1

None of these

An α-particle enters a magnetic field of 1 tesla with a velocity 10⁶ m/s in a direction perpendicular to the field.The force on α-particle is

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1.6 x 10^-13 N

6.4 x 10^-13 N

4.8 x 10^-13 N

3.2 x 10^-13 N

The A.M waves frequency range lies

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540 Hz to 1600 Hz

540 K Hz to 1600KHz

540 Hz to 1600 KHz

None

A resistor is connected in order to convert galvanometer into ammeter

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Very high resistor

High resistor

Lower resistor

Very low resistor

The rate of change of angular velocity is called

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Angular displacement

Angular acceleration

Instantaneous velocity

None of these

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

In case of destructive interference of two waves, the amplitude of the resultant wave will be_______either of the waves:

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Greater than

Smaller than

Equal to

none of these

When K.E_maxof the photoelectron is zero then the frequency f is the equal to

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Minimum frequency

Maximum frequency

Threshold frequency

None of these

The perpendicular distance form the line of action of force to the pivot point is called

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couple arm

angular distance

moment arm

none of them

Identify the incorrect statement

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The distance between the objective and eye-piece is 16.02 cm

The angular magnification of the planet is 800

The image of the planet is inverted

The objective is larger than the eye-piece