Question # 1

LASER is a device which can produce.

Choose an answer

Monochromatic beam of light

Coherent beam of light

An intense beam of light

All of the above

The electrons behave as waves, because they can .

Choose an answer

Produce ions in gases

Diffracted by a crystal

Be deflected by electric fields

Be deflected by magnetic fields

Ebers-Moll model describes the working of a

Choose an answer

BJT

FET

MOSFET

UJT

The gama rays have

Choose an answer

Thin tracks

Thick tracks

No definite tracks

Continuous tracks

At what speed the mass of a body will be doubled.

Choose an answer

0.67 C

0.77 C

0.87 C

0.97 C

Which of the following radiations will burn human skin

Choose an answer

Infrared

Ultraviolet

X rays

Alpha particles

An oscillator is basically an amplifier with loop gain

Choose an answer

Zero

Less than unity

More than unity

Infinity

One becquerel is equal to

Choose an answer

Decay of orie radioactive atoms per second

Decay of 10 radioactive atoms per secnd

Decay of 100 radioactive atoms per second

Decay of infinity radioactive atoms per second.

When Be is bombarded by alpha particles, then we obtain

Choose an answer

electron

Proton

Positron

Neutron

Which of the following particles leave no trail in a cloud chamber.

Choose an answer

Electrons

Protons

Alpha particles

Neutrons

Push pull amplifiers employ

Choose an answer

One transistor

Two transistors

Three transistors

Four transistors

The output of two input OR gate is zero only when its.

Choose an answer

Either input is one

Either input is zero

Both inputs are zero

Both inputs are one

The charge on a helium nucleus is equal to the charge of.

Choose an answer

Two electrons

Two protons

Two neutrons

One proton

The energy equivalent of 1 kg of matter a

Choose an answer

10^-15 J

1 J

10¹²J

10¹⁷ J

A logic circuit with one input and one output that inverts the input signal at the output is.

Choose an answer

AND gate

NOT gate

OR gate

NOR gate

the alpha particle does not travel for enough in air.

Choose an answer

Due to its intense ionization

Due to its large mass

Due to its high charge

Due to its Hight Ionization

The X-rays coming from a X-rays tube

Choose an answer

Is monochromatic

Has all wavelengths smaller than a certain maximum wavelength

Has all wavelengths greater than a certain maximum wavelength

has all wavelengths minimum than a certain maximum wavelength

The usefulness of X rays is largely due to their

Choose an answer

Mass

Density

Volume

Penetrating power

Radioactivity is the phenomenon associated with the.

Choose an answer

Transition of radiowaves

production of alpha particles only

Decay of nucleus

Reception of radio waves

The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.

Choose an answer

Directly proportional to n

Directly proportional to n2

Inversely proportional to n

Inversely proportional to n2

The SI unit of decay constant is.

Choose an answer

m

m-1

s-1

N m-1

More Classes

Other Links

PPSC Physics Chapter 7 Modern Physics 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