Question # 1

Alfa particles are

Choose an answer

hydrogen nuclei

helium nuclei

electrons

photons

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

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Choose an answer

0°C

10°C

17°C

20°C

Peak value of alternative current is:

Choose an answer

one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

The body oscillates due to ______ accelerates and overshoots the rest position due to _____:

Choose an answer

Applied force , inertia

Restoring force, friction

Frictional force, inertia

Restoring force, inertia

The frequency of free vibrations is known as

Choose an answer

free frequency

forced frequency

natural frequency

un-natural frequency

When body moves with increasing acceleration, its velocity time graph is a

Choose an answer

straight line

horizontal straight line

vertical straight line

curve

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)

When current passes through a solenoid coil, it behaves like a

Choose an answer

loop

circle

bar magnet

none of these

When certain nucleus emits anα particle, its mass number:

Choose an answer

Increases by one

Decreases by one

Remain same

Decreases by four

None of these

The e/m of an electron moving in a circular path in a magnetic field is equal to

Choose an answer

V/Br

V/B²r²

V²/Br²

V²/Br

In AND gate, the output is 1 if:

Choose an answer

Both inputs are 0

Both inputs are 1

Only one input is 0

Both (A) and (B)

Both (A) and (C)

If force and displacement are in opposite direction, the work done is taken as:

Choose an answer

Positive work

Negative work

Zero work

Infinte work

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Choose an answer

photo diode

light emitting diode

photo voltaic cell

none of these

As the light shines on the metal surface, the electrons are ejected

Choose an answer

slowly

instantaneously

either of these

none of these

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Choose an answer

polonium uranium

uranium and radium

polonium and radium

none of these

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

0.10 cm can be written as:

Choose an answer

1.0 x 10^-2m

1.0 x 10^-3cm

1.0 x 10^-4cm

1. x 10^-4m

The whole structure obtained by the repetition of unit cells is called:

Choose an answer

Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

Centripetal acceleration is also called _______ acceleration:

Choose an answer

Tangential

Radial

Angular

None of them

Davision and Germer performed experiment to verify

Choose an answer

de-Brogile hypothesis

theory of relativity

Newton's law of gravitation

Mass-energy relation

When certain nucleus emits aβ-particles, is mass number:

Choose an answer

Remain same

Increases by one

Decreases by one

Decreases by four

None of these

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Choose an answer

0.1 V

8 V

2 V

0.5 V

In the same medium, velocity of the wave:

Choose an answer

Goes on increasing

Remains constant

Goes on decreasing

None of these

The internal pressure of the blood is

Choose an answer

less than the external atmospheric pressure

greater than the external atmospheric pressure

equal to the external atmosphericpressure

none of them

For a parallel resonant circuit at resonance, current from supply is

Choose an answer

minimum

maximum

zero

none of these

Work done is independent of path followed in _______

Choose an answer

Gravitational field

Magnetic field

Electric field

All of these

transverse wave motion is possible in:

Choose an answer

Air

A mixture of NH₃and O₂

Strings

All of these

Referring to the above figure, we can say that of all the elements, the most stable element is

Choose an answer

Phosphours

Iron

uranium

Lithium

Bismuth

The best conductor is:

Choose an answer

Silver

Copper

Aluminimum

Both B and C

None of them

Compton shift refers to:

Choose an answer

Photon

Meson

Proton

Positron

Both (B) and (D)

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