Atoms-and-Molecules UPSC Questions

Atoms-and-Molecules MCQ Questions

7.
Television picture tubes are cathode ray tubes and television pictures result due to _____ on the television screen coated with certain fluorescent or phosphorescent materials
A.
Fluorescence
B.
Precipitation
C.
Condensation
D.
Effervescence
ANSWER :
A. Fluorescence
8.
The cathode rays consisting of negatively charged particles called _____
A.
Protons
B.
Isotopes
C.
Electrons
D.
Neutrons
ANSWER :
C. Electrons
9.
The electrons are the basic constituent of all the ______
A.
Molecules
B.
Protons
C.
Cathode
D.
Atoms
ANSWER :
D. Atoms
10.

Identify the RIGHT statements from the following
a) Thomson argued that the amount of deviation of the particles from their path in the presence of electrical or magnetic field depends upon the following reasons.
b) The magnitude of the negative charge on the particle, greater the magnitude of the charge on the particle, greater is the interaction with the electric or magnetic field and thus greater is the deflection
c) The mass of the particle — lighter the particle, greater the deflection.
d) the strength of the electrical or magnetic field — the deflection of electrons from its original path increases with the increase in the voltage across the electrodes, or the strength of the magnetic field

A.

Only d

B.

All a,b,c,d

C.

Both a and b

D.

Only c

ANSWER :

B. All a,b,c,d

11.

What is the charge of electron? (in C)

A.

-1.6x10-19

B.

-1.6

C.

16

D.

-16

ANSWER :

A. -1.6x10-19

12.
Electrical discharge carried out in the modified cathode ray tube led to the discovery of _____ carrying positively charged particles.
A.
Anode rays
B.
Protons
C.
Canal rays
D.
Cathode rays
ANSWER :
C. Canal rays