Question # 1

γ-rays behave like a particle because they explain the

Choose an answer

Compton effect

Photoelectric effect

Pair-production

all the above

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Choose an answer

photo diode

light emitting diode

photo voltaic cell

all of them

The direction of velocity is along the direction of

Choose an answer

distance

displacement

acceleration

all of them

During the positive half-cycle in the half-wave rectification,the diode

Choose an answer

does not conduct

conducts

either of these

neither of these

Work is a always done on a body when

Choose an answer

A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B are correct

The motion in a plane is the motion in

Choose an answer

one dimension

two dimension

three dimension

four dimension

Which one of the following causes production of heat when current is set up in a wire?

Choose an answer

Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

The fractional change in resistance per kelvin is known as

Choose an answer

temperature coefficient

resistance coefficient

super temperature

critical temperature

Amplitude in SHM is equivalent to ______ in circular motion:

Choose an answer

Diameter

Radius

Circumference

None of these

Internal friction of fluid is called

Choose an answer

Surface tension

Viscosity

Resistance

Cohesive force

When a body moves with a constant speed in a circle:

Choose an answer

No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

Choose an answer

2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

In compressional wave,the layer of medium having reduced pressure is called:

Choose an answer

Compression

Elasticity

Node

Rarefaction

Significant figures in 0.0010 are:

Choose an answer

Four

Three

Two

One

A body is executing free vibrations when it oscilates

Choose an answer

with the interference of an external force

without the interference of an external force

with the interference of an internal force

none of them

The electrons in the outermost shell of an atom are called

Choose an answer

core electrons

valence electrons

high energy electrons

none of them

The reciprocal of decay constant λ of a radioactive material is:

Choose an answer

Frequency

Half life

Year

Mean life

None of these

The special theory of relativity is based on:

Choose an answer

Four postulates

Three postulates

Two postulates

One postulate

None of these

The natural arrangement of colours in the spectrum of white light spectrum is

Choose an answer

VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

The pointer of a magnetic compass:

Choose an answer

Is affected only by permanent magnets

Align itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both (C) and (D)

The curie temperature of iron is about

Choose an answer

250°C

500°C

750°C

1000°C

The curve representing an isothermal process is called

Choose an answer

adiabat

isotherm

fixed temperature

none of them

If the acceleration of a body is negative, then slope of the velocity-time graph will be:

Choose an answer

Zero

Positive

Negative

Infinity

The magnitude of the force producing an acceleration of 10 m/sec2 in a body of mass 500 grams is:

Choose an answer

3 N

4 N

5 N

6 N

Such an inductor coil which does not consume energy and is often employed for controlling a.c. without consumption of energy is called

Choose an answer

Choke

impedance

Semi-conductor

None

When two objects come to common temperature, the body is said to be in:

Choose an answer

Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

______ plays the same role during angular motion as played by the mass in linear motion

Choose an answer

Torque

Angular Momentum

Moment of a force

Moment of inertia

One torr is equal to

Choose an answer

13.33 N/m²

760 N/m²

760 mm Hg

133.3 N/m²

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Choose an answer

The electric filed is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

Work done is maximum when angle between force and displacement is

Choose an answer

0°

90°

180°

None of these

Glass and high carbon steel are the examples of

Choose an answer

brittle substances

ductile substances

plastic substances

elastic substances

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