Question # 1

In an N-type silicon, which of the following statement is true

Choose an answer

Electrons are majority carriers and trivalent atoms are the dopants

Electrons are minority carriers and pentavalent atoms are the dopants

Holes are minority carriers and pentavalent atoms are the dopants

Holes are majority carriers and trivalent atoms are the dopants

For production of beats the two sources must have

Choose an answer

Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

Choose an answer

150 m

250 m

350 m

400 m

The law of conservation of mass gives us the

Choose an answer

equation of continuity

Bernoulli's theorem

both of them

none of them

The SI unit of stress is

Choose an answer

N/m²

Nmc

dynes/m

N

The maximum displacement of a body on either side of its equilibrium position is called

Choose an answer

frequency

amplitude

displacement

time period

Tesla is the unit of

Choose an answer

Magnetic induction or flux density

Magnetic flux

Self inductance

None of these

The pattern of NaCl particles have a shape which is :

Choose an answer

Cubic

Body centred cubic

Simple cubic

face centred

Both (A) and (C)

The value of the potential difference across the depletion region for the case of germanium is

Choose an answer

0.3 V

0.5 V

0.7 V

0.9 V

In reverse-biased p-n junction, the reverse current is due to flow of:

Choose an answer

Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

Choose an answer

impurification

adding

doping

extrinsivity

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

Choose an answer

1 : 2

4 : 1

1 : 4

2 : 1

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

Choose an answer

Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

SI unit of frequency is

Choose an answer

second

hertz

revolution

vibrations/sec

A diode characteristic curve is a plot between

Choose an answer

current and time

voltage and time

voltage and current

forward voltage and reversed voltage

When body moves with increasing acceleration, its velocity time graph is a

Choose an answer

straight line

horizontal straight line

vertical straight line

curve

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Choose an answer

Four-fold

One-half

One-fourth

Zero

When a platinum wire is heated, it appears white at

Choose an answer

1600°C

900°C

1100°C

1300°C

The force experienced by an electron projected in a magnetic field B with a velocity V is given by

Choose an answer

F=e(V x B)

F= -e(V x B)

F= e(B x V)

Both a and c

Magnetic effect at a point caused due to flow a current depend upon the

Choose an answer

Quantity of current

Distance from current

Both the quantity of current and distance from current element

None of the all

The CRO is used for displaying the waveform of a given

Choose an answer

current

voltage

both of them

none of them

In case of mechanical waves, we study the motion of

Choose an answer

a single particle

collection of particle

any one of them

none of them

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

Choose an answer

second law thermodynamics

first law of thermodynamics

third law of thermodynamics

none of them

The isotope/s of hydrogen is /are:

Choose an answer

Protium

Deuterium

Tritium

Both (A) and (B)

All of these

If a freely oscillating system is subjected to an external force, then

Choose an answer

free vibrations will take place

the body will move with its natural frequency

forced vibrations will take place

none of them

A person standing near the track of a fast moving train has tendency to fall towards it because of

Choose an answer

Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

When a bicycle is in motion, the frictional forces exerted by the ground are

Choose an answer

In the forward direction on both the wheels

In the backward direction on both the wheels

In the forward direction on the front wheel and the backward direction on the rear wheel

In the backward direction on the front wheel and the forward direction on the rear wheel

When a conductoris moved across a magnetic field:

Choose an answer

Emf induced its similar to that of a battery

Emf induced gives rise to induced current

An emf is induced across its ends

All are correct

None of these

The arrangement or molecules or atoms in a crystalline solid can be studied by using:

Choose an answer

Chemical methods

Neutrons

X-ray techniques

Copper atoms

Both (A) and (B)

The square of 0.4 is:

Choose an answer

Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

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

Choose an answer

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

More Classes

Other Links

ECAT Physics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer