Modern Physics: MCQ Test (25 questions)

Question 1 of 25

The atomic number of an element is the number of...

Aneutrons in the nucleus
Belectrons in the nucleus
Cprotons in the nucleus
Dnone of these

Question 2 of 25

Who takes three-dimensional pictures?

AHolography
BPhotography
CPhotochromatic
DRadiography

Question 3 of 25

Einstein was awarded the Nobel Prize for-

Afor photoelectric effect
BFor the theory of specific heats
CFor the special theory of relativity
Dfor Bose-Einstein statistics

Question 4 of 25

Energy is produced in nuclear reactors by-

Aby controlled fusion
Bby uncontrolled fusion
Cby controlled fission
Dby uncontrolled fission

Question 5 of 25

The principle of atomic bomb is based on—

Aon nuclear fusion
Bon nuclear fission
Con both of the above
Dnone of these

Question 6 of 25

TV remote control works on the principle of…

Ainfrared
BBluetooth technology
Claser technology
Dultrasonic wave

Question 7 of 25

Which of the following has a negative charge?

AX-rays
Ba - particle
CB particles
Dy-particle

Question 8 of 25

'Super conductors' are substances which are-

Awhich offers the least resistance to the flow of electric current
Bwhich conduct electricity at low temperatures
Cwhich conduct electricity at high temperatures
DWhich provide high resistance to the flow of electric current.

Question 9 of 25

Hydrogen bomb is based on-

Aon nuclear fusion
Bon nuclear fission
Con all of the above
Don all of the above

Question 10 of 25

Who treats stones without surgery?

AX-ray
Bpleuroscopy
CLaser
Dultrasound

Question 11 of 25

At what temperature can superconductivity be of great economic importance, leading to savings of millions of rupees?

Aat extremely low temperatures
BThe temperature at which it becomes a semiconductor
Cat normal temperature
Dat extremely high temperatures

Question 12 of 25

Which one of the following is not a property of X-rays?

AThey are deflected by electric fields
BThey are not deflected by magnetic fields.
CTheir penetration length in matter is high.
DIt has a much shorter wavelength than visible light.

Question 13 of 25

Protons reside in the atom-

Awithin the nucleus
Boutside the nucleus
Cin the orbital
Dboth in the nucleus and in the orbitals

Question 14 of 25

Why are appropriate impurities added to a semiconductor depending on its use?

Aincrease its electrical conductivity
Bincrease its electrical resistivity
Cenhance its working method
Dto make it capable of withstanding higher voltages

Question 15 of 25

Consider the following statements: Assertion (A) Ernest Rutherford stated before the Royal Society that nuclear power would never be available to mankind. Reason (R) He believed that Einstein's law would fail and matter would not be converted into energy. Select your level from the coding scheme given below:

ABoth A and R are true and R is the correct reason
BBoth A and R are true, but R is not the correct reason
CA is true, but R is false.
DA is false, but R is true

Question 16 of 25

An isotope of an atomic nucleus is that nucleus in which-

AThe number of neutrons is the same, but the number of protons is different
BThe number of protons is the same, but the number of neutrons is different.
CThe number of both protons and neutrons remains the same.
DBoth protons and neutrons have different numbers.

Question 17 of 25

When arsenic atoms are added to the germanium lattice, what does it become?

Aexternal semiconductor
Binsulating
CSuper Conductor
DDifferential Semi-conductor

Question 18 of 25

The following principle works in the atomic bomb:

Anuclear fusion
Bnuclear fission
CFleming's Law
Dphotoelectric effect

Question 19 of 25

Two elements having different number of electrons but same mass number are called-

Aisotopes
Bisobar
Cisomer
Dsumneutronic

Question 20 of 25

Otto Hahn discovered the atomic bomb on the basis of the following principle:

Auranium fission
Bnuclear fission
Calpha radiation
Dgamma radiation

Question 21 of 25

What is a nuclear reactor?

Aatomic bomb manufacturing site
Bheavy water lock
Cemitter of U-238
Datomic reactor

Question 22 of 25

Curie is the name of whose unit?

Aradioactivity
Btemperature
Cheat
Denergy

Question 23 of 25

Neutron was discovered by-

ARutherford
BThomson
CChadwick
DNewton

Question 24 of 25

The temporary particle in the following is-

AProton
Belectron
CNeutron
Dalpha particles

Question 25 of 25

According to the special theory of relativity, which of the following is not relative?

Acontemporaneity
Bspeed of light
Clength of an object
Dtime interval between two events