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

The intensity at a point due to a charge is inversely proportional to

Choose an answer

Amount of charge

Size of the charge

Distance between charge and the point

Square of the distance from the charge

None of these

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

Choose an answer

9 x 10⁵V

9 V

8 x 10⁶V

80 V

The length contraction happens only

Choose an answer

Opposite to the direction of motion

along the direction of motion

perpendicular to the direction of motion

In any direction

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Choose an answer

high - low

yes - no

on - off

0 - 1

Which type of wave can be set up in solids

Choose an answer

longitudinal waves

transverse waves

both of them

none of them

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Choose an answer

2V

3V

0.5V

V

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Choose an answer

Charge Q

Potential V

Capacity

Energy U

Beta particles are

Choose an answer

hydrogen nuclei

helium nuclei

electrons

photons

The second law gives the relationship between

Choose an answer

mass and velocity

force and acceleration

velocity and acceleration

mass and weight

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

Choose an answer

1/3 V

2/3 V

3/2 V

3V

In the doping process, the ratio of the doping atoms to the semi conductor atom is

Choose an answer

1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

For the normal operation of the transistor, its

Choose an answer

emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

Ammeter is used to measure

Choose an answer

voltage

resistance

voltage and current

current

While deriving equation of pressure by kinetic theory of gases, we take into account:

Choose an answer

Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

In a normal healthy person the value of diastolic pressure is

Choose an answer

75 - 80 torr

100 torr

120 torr

none of them

The value of the Stephen's constant for black body radiations is given by

Choose an answer

5.6 x 10⁸Wm^-2K^-4

5.67 x 10^-8Wm^-2K^-4

2.9 x 10^-3mK

2.9 x 10³mK

In transverse waves, the individual particles of the medium move:

Choose an answer

In circles

Perpendicular to the direction of level

Parallel to the direction of level

None of these

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Choose an answer

Increase

Decrease

May increase or decrease

Remain the same

When a stress changes length, it is called the

Choose an answer

compressional stress

tensile stress

shear stress

any one of them

Ethanol (alcohol) is a type of:

Choose an answer

Electric fuel

Bio fuel

Nuclear fuel

None of these

The device which allows only the flow of an A.C. through a circuit is

Choose an answer

Capacitor

Inductor

D.C. motor

Battery

The value of resistivity is the least for:

Choose an answer

Copper

Aluminimum

Silver

Tungsten

Iron

The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is called

Choose an answer

constant rate

volume rate

flow rate

steady rate

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

Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

Choose an answer

The faster one

Depends on their mass

The slower one

Both will reach simultaneously

An important part of inkjet printer is:

Choose an answer

Toner

Drum

Deflection plates

Heated roles

None of these

Average value of A.C voltage during one cycle is

Choose an answer

1

Zero

Maximum

Variable

In a straight current carrying conductor, the direction of magnetic field can be found by

Choose an answer

right hand rule

left hand rule

head to tall rule

none of these

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Choose an answer

60 W bulb

100 W bulb

Both equally

None of these

Lead, copper and wrought iron are examples of

Choose an answer

brittle substances

ductile substances

plastic substances

elastic substances

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