Question # 1

From the theory of relativity, momentum p of the photon is related to energy as

Choose an answer

p = hfc

p = hf/c

p = f(hc,f)

p = cf/h

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

Earth is considered to be

Choose an answer

a non-inertial frame

an inertial frame

an accelerated frame

none of the above

The mechanics, which deals with the objects moving with velocities approaching that of light is called

Choose an answer

Relativistic mechanics

Wave mechanics

Quantum mechanics

Statics

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

Choose an answer

10²

10³

10⁴

10⁵

The word amorphous means:

Choose an answer

Without any structure

With definite structure

Regular arrangement of molecules

Both (B) and (C)

None of these

Particles have the mass smallest of following is:

Choose an answer

Electron

Proton

Neutron

Quark

Two vectors having different magnitudes:

Choose an answer

Have their directions opposite

May have their resultant zero

Cannot have their resultant zero

None of these

The number of all the protons and neutrons in a nucleus is known as

Choose an answer

atomic number

mass number

charge number

none of these

Alfa , beta and gamma rays are emitted from a radio-active substance

Choose an answer

spontaneously

when it is heated

when it is exposed to light

When it interacts with the other particle

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 direction of velocity is along the direction of

Choose an answer

distance

displacement

acceleration

all of them

A mass difference of 0.0012 u is equivalent to and energy of:

Choose an answer

0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

The SI unit of magnetic flux is.

Choose an answer

weber

Nm^-1A^-1

tesla

gauss

Above the curie temperature, iron becomes

Choose an answer

ferromagnetic

paramagnetic

diamagnetic

any one of them

The band above the valence band is called

Choose an answer

high energy band

conduction band

empty band

none of them

Computer chips are made from

Choose an answer

Conductors

Semiconductors

Insulators

Both A and B

The direction of the streamlines is the same as the direction of the

Choose an answer

force

torque

velocity

weight

Particles have the mass smallest of following is

Choose an answer

Electron

Proton

Neutron

Quark

The domains are of macroscopic size of the order of

Choose an answer

centimeters

meters

millimeters

nanomneters

When the pn-junction is in reversed biased, current flows through the junction due to the

Choose an answer

majority carriers

minority carriers

either of them

none of them

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

Choose an answer

500 m

500 nm

500 km

500 cm

None of these

Avo-meter is used of measure the

Choose an answer

current, voltage

voltage, resistance

resistance, current

current, voltage and resistance

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

Choose an answer

5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

Amperean path is a:

Choose an answer

Closed path

Rectangular path

Circular path

Any of above

Broken path

When there is no internal frictional forces between the adjacent layers of fluid, then the fluid is called

Choose an answer

incompressible

compressible

viscous

non viscous

A convex lens acts as diverging lens when the object is placed:

Choose an answer

Between F and 2F

At 2F

With focal length

Beyond 2F

The value of viscosity of a fluid is dependent on (at constant temperature)

Choose an answer

the fluid itself

the fluid and its container

anything in contact with the fluid

all of the above

The velocity of sound in air depends upon

Choose an answer

Density and elasticity of gas

Pressure

Wavelength

Amplitude and frequency of sound

The electric field lines start from:

Choose an answer

Positive charge

Negative charge

Either A and B

Neutron

An atom

More Classes

Other Links

Physics ECAT Pre Engineering 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