Question # 1

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

Choose an answer

Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

Second's pendulum is the pendulum whose time period is:

Choose an answer

1 second

2 second

3 second

None of these

The energy of a photon is represented by

Choose an answer

h/c²

h/T

hc²

hf/c²

The resistance of the given conductor can be increased by

Choose an answer

Increasing the area

Changing resistivity

Decreasing the length

None of the above because change does not matter because in any case the volume remains the same

When we consider the average velocity of a body, then the body is moving in

Choose an answer

straight line

curved path

may be in a straight or curved path

none of them

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

Choose an answer

Decreases

Increases

Remains the constant

Either of these

None of these

Dimension of mass is written as:

Choose an answer

M

[M]

(M)

[m]

The internal energy of an ideal gas system is generally the

Choose an answer

translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

The appearance of the colour in the soap (oil) film results from:

Choose an answer

Dispersion

Interference

Reflection

Refraction

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

Choose an answer

60°

90°

120°

180°

Each atom in metal crystal:

Choose an answer

Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

At constant volume temperature is increased. Then

Choose an answer

Collision on walls will be less

Number of collisions per unit time will increase

Collision will be in straight lines

Collision will not change

When a stress changes length, it is called the

Choose an answer

compressional stress

tensile stress

shear stress

any one of them

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Choose an answer

2 : 1

4 : 1

1 : 4

3 : 4

Force is a:

Choose an answer

Scalar quantity

Base quantity

Derived quantity

None of these

Crystalline solids are in the form of:

Choose an answer

Metals

Ionic Compounds

Ceramics

Both (A) and (B)

All of these

When a body is vibrating, the displacement from mean position:

Choose an answer

Increases with time

Decreases with time

Changes with time

None of these

A transistor has:

Choose an answer

One region

Two regions

Three regions

Four regions

None is correct

Liquids and gasses have

Choose an answer

zero viscosity

non-zero viscosity

very large viscosity

very small viscosity

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Choose an answer

1.66 m

1.0 m

0.66 m

2.66 m

Photons must have energy equal to

Choose an answer

ev

En

hf

None of these

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Choose an answer

Diffraction

Interference

Polarization

Dispersion

The magnitude of induced emf depends upon the:

Choose an answer

Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

Choose an answer

Increase

Decrease

Remain F

Become 10F/9

The basic circuit element in D.C. circuit is:

Choose an answer

A capacitor

A resistor

An inductor

Both (A) and (C)

Both (A) and (B)

Efficiency of carnot engine is independent of the

Choose an answer

temperature of sink

temperature of source

nature of the working substances

none of them

The isotope/s of hydrogen is /are:

Choose an answer

Protium

Deuterium

Tritium

Both (A) and (B)

All of these

In the formula P = N₀KT, N₀denotes:

Choose an answer

Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

Which of the following material has smaller has life

Choose an answer

uranium

polonium

radium

radian

When two protons are brought closer potential energy of both of them:

Choose an answer

Increases

Decreases

Remains same

None of these

Velocity of sound in vacuum (in m/s) is

Choose an answer

330

1000

156

0

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