Question # 1

The inside cavity of the black body is

Choose an answer

painted white

painted silver

blackened with soot

painted red

The conventional current is the name given to current due to flow of:

Choose an answer

Positrons

Positive charges

Negative charges

Both (A) and (C)

None of these

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Choose an answer

decrease

remains the same

increase

any one of them

The Einstein's changes in length, mass and time are not observed in common life because

Choose an answer

We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

Which of the following substances has got positive temperature coefficient of resistance?

Choose an answer

Carbon

Germanium

Silicon

Aluminium

None of these

The total energy of spring mass system is

Choose an answer

zero

changing with time

constant

none of them

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved

Choose an answer

1.92 N

19.2 N

12 N

0.192 N

When a nucleus emits an alpha particle, it atomic mass decreased by

Choose an answer

2

1

4

3

Pair production take place when energy ofγ-rays photon is

Choose an answer

equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

Photocell is a device which converts

Choose an answer

chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

The electric flux from a closed surface

Choose an answer

Is independent of the shape of the surface

Depends on the charge enclosed by the surface

Both a and b

None of the above

The SI unit of electric field intensity is

Choose an answer

CN^-1

NC^-1or Vm^-1

JC^-1

AV^-1

Bernoulli's equation is based upon law of conservation

Choose an answer

Mass

Momentum

Energy

None of these

Bernoulli's equation is the fundamental equation in fluid dynamics, which relates pressure to fluid

Choose an answer

speed

height

none of them

both of them

The electric lines of force are

Choose an answer

Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

In bringing an electron towards another electron, electrostatic potential energy of system

Choose an answer

Decreases

Increases

Remains uncharged

Becomes zero

If the instantaneous velocity of a body does not change. the body is said to be moving with

Choose an answer

average velocity

uniform velocity

instantaneous velocity

variable velocity

A second's pendulum is a pendulum whose time period is

Choose an answer

1 second

2 seconds

3 seconds

4 seconds

In series RC circuit when R=X_c, then the phase angle is

Choose an answer

0°

90°

70°

45°

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10^-19C. The number of excess electrons on the drop is

Choose an answer

3.9

4

4.2

6

Electric potential of earth is taken to be zero because the earth is good

Choose an answer

Semiconductor

Conductor

Insulator

Dielectric

The short distance between two points direction from its initial point to final point is called:

Choose an answer

Velocity

Displacement

Speed

Distance

A carnot cycle consists of

Choose an answer

One step

two step

three steps

four steps

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Choose an answer

pair production

Compton effect

photoelectric effect

relativity

The general theory of relativity treats problems involving

Choose an answer

inertial frame of references

accelerating frame of references

both of these

none of these

The wave form of S.H.M will be

Choose an answer

square wave

sine wave

rectified wave

saw-tooth wave

The fractional change in resistance per kelvin is known as

Choose an answer

temperature coefficient

resistance coefficient

super temperature

critical temperature

The open loop gain of OP-AMP is of the order of

Choose an answer

10²

10³

10⁴

10⁵

The direction of velocity is along the direction of

Choose an answer

distance

displacement

acceleration

all of them

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

Choose an answer

Stronger

Weaker

Much weaker

Absent

None of these

A car moves for half of its time at 80 km/h and rest half of time at 40 km/h, The total distance covered is 60 km. What is the average speed of the car?

Choose an answer

60 km/hr

80 km/hr

120 km/hr

180 km/hr

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