Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 74

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Weekly Quiz Competition

Question 1
4 / -1

An electron is moving with constant velocity along x-axis. If a uniform electric field is applied along y-axis, then its path in the x-y plane will be

A
A straight line

B
A circle

C
A parabola

D
An ellipse
Question 2
4 / -1

Cathode rays are similar to visible light rays as

A
They both can be deflected by electric and magnetic fields

B
They both have a definite magnitude of wavelength

C
They both can ionize a gas through which they pass

D
They both can expose a photographic plate
Question 3
4 / -1

Which of the following devices makes use of the electrons to strike certain substances to produce fluorescence ?

A
Thermionic valve

B
Photoelectric cell

C
Cathode ray oscilloscope

D
Electron gun
Question 4
4 / -1

An oxide coated filament is useful in vacuum tubes because essentially

A
It has high melting point

B
It can withstand high temperatures

C
It has good mechanical strength

D
It can emit electrons at relatively lower temperatures
Question 5
4 / -1

Gases begin to conduct electricity at low pressure because

A
At low pressure, gases turn to plasma

B
Colliding electrons can acquire higher kinetic energy due to increased mean free path leading to ionization of atoms

C
Atoms break up into electrons and protons

D
The electrons in atoms can move freely at low pressure
Question 6
4 / -1

Kinetic energy of emitted cathode rays is dependent on

A
Only voltage

B
Only work function

C
Both (a) and (b)

D
It does not depend upon any physical quantity
Question 7
4 / -1

The radius of the orbital of electron in the hydrogen atom is 0.5 Å. The speed of the electron is 2 ×10⁶ m/s. Then the current in the loop due to the motion of the electron is

A
1 mA

B
1.5 mA

C
2.5 mA

D
1.5 × 10^–2 mA

Solution
Question 8
4 / -1

Cathode rays and canal rays produced in a certain discharge tube are deflected in the same direction if

A
A magnetic field is applied normally

B
An electric field is applied normally

C
An electric field is applied tangentially

D
A magnetic field is applied tangentially

Solution
Question 9
4 / -1

A metal plate gets heated when cathode rays strike against it due to

A
Kinetic energy of cathode rays

B
Potential energy of cathode rays

C
Linear velocity of cathode rays

D
Angular velocity of cathode rays
Question 10
4 / -1

In Millikan\'s experiment, an oil drop having charge q gets stationary on applying a potential difference V in between two plates separated by a distance ‘d\'. The weight of the drop is

A

B

C

D

Solution