Modern Physics: MCQ Test (50 questions)

Question 1 of 50

What is the conductivity of a superconductor?

AUnlimited
BLess
CZero
DMore

Question 2 of 50

Energy is produced in nuclear reactors by-

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

Question 3 of 50

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 4 of 50

The alpha particle has two units of positive charge. Its mass is approximately equal to-

Aof two protons
Bof an atom of helium
CThe sum of the masses of two positrons and two neutrons
Dof two positrons because each positron has only one positive charge.

Question 5 of 50

What is a nuclear reactor?

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

Question 6 of 50

Due to what is the huge amount of energy released in the explosion of an atomic bomb?

Aconversion of matter into energy
Bconversion of chemical energy into heat energy
Cconversion of mechanical energy into nuclear energy
Dconversion of neutrons into protons

Question 7 of 50

The laser beam is always-

AConvergent beam
BDiverging beam
Cparallel beam
Dparallel at first and then divergent

Question 8 of 50

Barium is fed to patients in a suitable form before abdominal X-ray examination because-

ABarium allows X-rays to pass through the stomach due to its transparency to X-rays.
BVarium compounds, like magnesium sulfate, help clear the stomach before X-ray examinations.
CBarium is a good absorber of X-rays and this helps the stomach (compared to other areas) to be seen more clearly in the image.
DBarium salts are white in color and this helps the stomach to be seen more clearly in the image than other areas.

Question 9 of 50

In a laser, all the atoms emit light waves.

Aof the same frequency
Bof the same dimension
Cof the same phase
DAll of the above

Question 10 of 50

Hydrogen bomb is based on-

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

Question 11 of 50

Neutron was discovered by-

ARutherford
BThomson
CChadwick
DNewton

Question 12 of 50

Who takes three-dimensional pictures?

AHolography
BPhotography
CPhotochromatic
DRadiography

Question 13 of 50

The electromagnetic waves used for satellite communication are-

Ainfrared radiation
Bultraviolet radiation
Cradio waves
Dvisible light

Question 14 of 50

Curie is the name of whose unit?

Aradioactivity
Btemperature
Cheat
Denergy

Question 15 of 50

The electron was discovered by-

AThomson
BJames Watt
CGalileo
DRutherford

Question 16 of 50

Cryogenic engines are used in—

Ain the rocket
Bin a nuclear reactor
Cin frosted refrigerators
Din research on superconductivity

Question 17 of 50

The first nuclear reactor was built by-

AEinstein
BNewton
CRutherford
DFermi

Question 18 of 50

The difference between a nuclear reactor and an atomic bomb is that-

AThere is no chain reaction in a nuclear reactor whereas there is in an atomic bomb.
BThe chain reaction in a nuclear reactor is controlled by
CThe chain reaction in a nuclear reactor is not controlled.
DThere is no chain reaction in an atomic bomb whereas there is in a nuclear reactor.

Question 19 of 50

Cobalt-60 is commonly used in radiation therapy because it emits-

Aalpha rays
BVita Rays
Cgamma rays
DX-rays

Question 20 of 50

Which of the following has a negative charge?

AX-rays
Ba - particle
CB particles
Dy-particle

Question 21 of 50

The waves used in radar systems are….

Ainfrared
Bradio
CUltraviolet
DMicro

Question 22 of 50

The process of splitting of a heavy nucleus into two lighter nuclei is called-

Anuclear fusion
Bnuclear fission
Cradioactive disintegration
DMass damage

Question 23 of 50

Find the number of protons in the nucleus of a hydrogen atom.

AZero
BOne
CThree
Dfive

Question 24 of 50

Photovoltaic cells are-

ASolar Cell
BThermal Cell
CSulfur Cell
Dmolar cell

Question 25 of 50

The age of the Earth is determined by which of the following methods?

Acarbon dating method
BBiotechnological method
Cbiological clock method
DUranium method

Question 26 of 50

'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 27 of 50

Who treats stones without surgery?

AX-ray
Bpleuroscopy
CLaser
Dultrasound

Question 28 of 50

Which of the following types of radiation has the shortest wavelength?

Aradio waves
Bvisible light
CInfrared
DUltraviolet

Question 29 of 50

The nucleus of an atom contains-

Aprotons and electrons
Bneutrons and electrons
Cjust electrons
Dneutrons and electrons

Question 30 of 50

Match List-I with List-II and select the correct answer using the code given below the lists. List-I (Radioisotopes) List-II (Diagnostic uses) A. Arsenic-74 1. Hyperactivity of thyroid gland B. Cobalt 60 2. Blood disorders C. Iodine-131 3. Tumor D. Sodium-24 4. Cancer

AABCD 1 2 3 4
BABCD 4 3 1 2
CABCD 3 4 1 2
DABCD 4 3 2 1

Question 31 of 50

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 32 of 50

Which of the following types of radiation has the shortest wavelength?

Aradio waves
BUltraviolet
CInfrared
Dvisible light

Question 33 of 50

By what can the penetrating power of X-rays be increased?

Aincreasing the current in the filament
BDecreasing the potential difference between the cathode and anode
Cby reducing the current in the filament
Dincreasing the potential difference between the cathode and the anode

Question 34 of 50

Laser beam is used for-

ALaser beam is used
Bin cardiac medicine
Cin eye medicine
DIn kidney therapy

Question 35 of 50

Which one of the following is essential in the construction of a nuclear reactor?

ACobalt
BNickel
CZirconium
Dtungsten

Question 36 of 50

The phenomenon associated with forming a three-dimensional image by the interference of two light rays emanating from a laser or any other coherent light source is called –

Aoptical photography
BX-ray photography
CRadiation Illustration
DHolography

Question 37 of 50

The age of the oldest style group is estimated.

AIn the K-Ar method
Bby the uranium-lead method
CBy Ra-Si method
DC 14by method

Question 38 of 50

Whose conclusion is the mass energy relation?

Aquantum theory
Bgeneral theory of relativity
CField theory of energy
DSpecial theory of relativity

Question 39 of 50

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

Question 40 of 50

How do stars get their energy?

Aas a result of nuclear fusion
Bfrom nuclear fission
Cby chemical reaction
Dby gravitational pull

Question 41 of 50

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 42 of 50

The source of inexhaustible energy in stars is due to-

Aconversion of hydrogen into helium
Bconversion of helium into hydrogen
Cdecay of radioactive substances
DAn abundance of oxygen that helps in combustion and produces energy

Question 43 of 50

'Laser' is a device which is produced by-

Aspontaneous radiation
BDispersed radiation
Cscattered radiation
DStimulated radiation

Question 44 of 50

Who invented the first thermionic valve?

AThomas Edison
BRichardson
CJ. A. Fleming
DLee D. Forest

Question 45 of 50

The energy of the sun is produced by-

Aby ionization
Bby nuclear fusion
Cby oxidation
Dby oxidation

Question 46 of 50

The semiconductor chip used in integrated circuits is made of-

ABeryllium
BCarbon
CSilicon
DZircon

Question 47 of 50

What are atoms called that have the same number of protons but different numbers of neutrons?

Aisobaric
Bisomer
Csumneutronic
Disotopes

Question 48 of 50

Television signals cannot be received beyond a certain distance because-

AThe signs are weak
BThe antenna is weak
Cabsorbs air signals
Dthe surface of the earth is curved

Question 49 of 50

X-rays are used to study crystal structure because-

AThe crystal completely absorbs X-rays.
BThe wavelength of X-rays and the interatomic distance of the crystal are of the same order of magnitude.
CX-rays have very small wavelengths, comparable to the interatomic distances of a crystal.
DThe crystal is completely transparent to X-rays.

Question 50 of 50

Which type of electromagnetic radiation is used for remote control of television?

AInfrared
BUltraviolet
CScene
Dnone of the above