Question 1

Plank's constant has units {{}}

Accepted Answer

A)  J
B)  s
C)  J s-1
D)  J s D

Question 2

Characteristic properties of waves are

Accepted Answer

A)  reflection
B)  refraction
C)  interference
D)  all of above D

Question 3

Gas atoms that exert negligible electrical forces on each other are

Accepted Answer

A)  molecules
B)  compounds
C)  isotopes
D)  isolated atoms D

Question 4

Neutrinos have electric charge of

Accepted Answer

A)  zero
B)  1
C)  2
D)  3

Question 5

β-radiations are simply {{}}

Accepted Answer

A)  protons
B)  neutrons
C)  electrons
D)  muons

Question 6

Most of the space in an atom is

Accepted Answer

A)  filled with positive charge
B)  empty
C)  filled with negative charge
D)  filled with neutrons

Question 7

In photoelectric effect, electrons should be removed from the

Accepted Answer

A)  inner shells
B)  surface
C)  from core
D)  the nucleus

Question 8

In β+ decay, an UP quark becomes

Accepted Answer

A)  a strange quark
B)  a simple quark
C)  a down quark
D)  an anti-quark

Question 9

Light interacts with matter as

Accepted Answer

A)  wave
B)  particle
C)  both A and B
D)  rays

Question 10

When white light is passed through cool gases, the spectra observed is called

Accepted Answer

A)  line spectra
B)  continuous spectra
C)  emission line spectra
D)  absorption line spectra

Question 11

Number of protons in an atom determine

Accepted Answer

A)  chemical properties
B)  physical properties
C)  magnetic properties
D)  electrical properties

Question 12

Wavelength of ultraviolet region of electromagnetic spectrum is

Accepted Answer

A)  121 nm
B)  120 nm
C)  119 nm
D)  130 nm

Question 13

A proton is made up of

Accepted Answer

A)  one up quark and two down quarks
B)  an up quark and down antiquark
C)  two up quarks and a down quark
D)  strange quark and an anti-strange quark

Question 14

Energy of an electron in an atom is

Accepted Answer

A)  quantized
B)  continuous
C)  radial
D)  randomized

Question 15

When a charged particle is accelerated through a potential difference V, it's kinetic energy

Accepted Answer

A)  decreases
B)  remains same
C)  increases
D)  varies depending on resistance of wire

Question 16

A specific combination of protons and neutrons in a nucleus is called

Accepted Answer

A)  nucleons
B)  nuclide
C)  neutrino
D)  nucleolus

Question 17

Electrons show diffraction effects because their de Broglie wavelength is similar to

Accepted Answer

A)  spacing between atomic layers
B)  no. of atomic layers
C)  nature of atomic layers
D)  positioning of atomic layers

Question 18

In dark, LDR has

Accepted Answer

A)  low resistance
B)  high current
C)  high resistance
D)  both A and B

Question 19

In an insulator, the valence band is

Accepted Answer

A)  fully occupied
B)  fully empty
C)  half filled
D)  half charged

Question 20

In a nuclear process, the quantity conserved is

Accepted Answer

A)  mass-energy
B)  momentum
C)  mass only
D)  energy only

Exam 23: Physics and Nuclear Science