Modern Physics: MCQ Test (50 questions)

Question 1 of 50

Hydrogen bomb is based on-

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

Question 2 of 50

What is a nuclear reactor?

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

Question 3 of 50

Which element has the most isotopes?

AUranium
BRadium
Chydrogen
DCesium

Question 4 of 50

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

Aradio waves
Bvisible light
CInfrared
DUltraviolet

Question 5 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 6 of 50

The laser beam is always-

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

Question 7 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 8 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 9 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 10 of 50

Protons reside in the atom-

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

Question 11 of 50

Atoms having the same atomic number but different atomic masses are called-

Aisobar
Bisotopes
CIsobars
DNone of these

Question 12 of 50

Laser beam is used for-

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

Question 13 of 50

Stars obtain their energy from- 1. Nuclear fusion 2. Gravitational contraction 3. Chemical reaction 4. Nuclear fission

A1 and 2
B1, 2 and 3
C1 and 4
D2 and 4

Question 14 of 50

Which device is used to convert solar energy into electricity?

Aelectrochemical cell
BGalvanic cell
CPhotovoltaic cell
DDaniel Sale

Question 15 of 50

The temporary particle in the following is-

AProton
Belectron
CNeutron
Dalpha particles

Question 16 of 50

NPN transistors are superior to PNP transistors because-

Aare cheap
BThere is less energy loss in these.
CThere is a greater flow of electrons in them
Dhave the ability to tolerate high temperatures

Question 17 of 50

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

Aisotopes
Bisobar
Cisomer
Dsumneutronic

Question 18 of 50

The first nuclear reactor was built by-

AEinstein
BNewton
CRutherford
DFermi

Question 19 of 50

Which of the following is used as a neutron moderator in a nuclear reactor?

Aheavy water
Bgraphite
CCadmium
Daluminium

Question 20 of 50

Who invented the first thermionic valve?

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

Question 21 of 50

What is the conductivity of a superconductor?

AUnlimited
BLess
CZero
DMore

Question 22 of 50

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

AZero
BOne
CThree
Dfive

Question 23 of 50

In isotopic atoms-

Ahave the same number of protons
Bhave the same number of neutrons
Chave the same number of nucleons
DAll are true

Question 24 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 25 of 50

What is radar used for?

Adetection of submerged submarines
BReceiving signals from a radio receiver
CIdentifying distant objects and detecting energy
Dlocating the satellite

Question 26 of 50

In the production of X-rays-

Aproduction of X-rays
Bnuclear fission in practice
Cthermonuclear fusion in operation
DIn nuclear acceleration

Question 27 of 50

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 28 of 50

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

AInfrared
BUltraviolet
CScene
Dnone of the above

Question 29 of 50

The electromagnetic waves used for satellite communication are-

Ainfrared radiation
Bultraviolet radiation
Cradio waves
Dvisible light

Question 30 of 50

Energy is produced in nuclear reactors by-

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

Question 31 of 50

The following principle works in the atomic bomb:

Anuclear fusion
Bnuclear fission
CFleming's Law
Dphotoelectric effect

Question 32 of 50

The resistance of a semiconductor when heated is-

Aincreases
Bdecreases
Cremains the same
DFirst increases and then decreases. (e) None of the above / More than one of the above

Question 33 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 liquid is large.
DTheir wavelength is much shorter than that of visible light.

Question 34 of 50

The electron was discovered by-

AThomson
BJames Watt
CGalileo
DRutherford

Question 35 of 50

Energy is produced in the Sun by-

Aby nuclear fission
Bby nuclear fusion
Cby oxidation reactions
Dby reduction reactions

Question 36 of 50

'Laser' is a device which is produced by-

Aspontaneous radiation
BDispersed radiation
Cscattered radiation
DStimulated radiation

Question 37 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 38 of 50

The energy of the sun is produced by-

Aby ionization
Bby nuclear fusion
Cby oxidation
Dby oxidation

Question 39 of 50

TV remote control works on the principle of…

Ainfrared
BBluetooth technology
Claser technology
Dultrasonic wave

Question 40 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 41 of 50

What is the Coolidge tube used to produce?

Aradio waves
Bmicrowaves
CX-rays
Dgamma rays

Question 42 of 50

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

Aexternal semiconductor
Binsulating
CSuper Conductor
DDifferential Semi-conductor

Question 43 of 50

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 44 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 45 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 46 of 50

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 47 of 50

Who takes three-dimensional pictures?

AHolography
BPhotography
CPhotochromatic
DRadiography

Question 48 of 50

The waves used in radar systems are….

Ainfrared
Bradio
CUltraviolet
DMicro

Question 49 of 50

When the TV is switched on, then-

ABoth audio and video start simultaneously
BThe audio is played immediately, but the visual is played later, as the scene requires some practice time.
CThe visuals begin immediately, but the audio is heard later because sound travels slower than light.
DIt depends on the brand of the TV.

Question 50 of 50

When two p and p type semiconductors are brought into contact, the pn junction they form acts as?

Aamplifier
BDriver
Coscillator
Drectifier