Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 39

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Weekly Quiz Competition

Question 1
4 / -1

A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength 20 Vm^–1 and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons?

A
20 ms^–1

B
40 ms^–1

C
8 ms^–1

D
5.5 ms^–1

Solution
Question 2
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 3
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 x 10^–2 mA

Solution
Question 4
4 / -1

The kinetic energy of an electron which is accelerated through a potential of 100 volts is

A
1.602 × 10^–17 J

B
418.6 calories

C
1.16 × 10⁴ K

D
6.626 × 10^–34 W-sec

Solution
Question 5
4 / -1

When a proton is accelerated with 1 volt potential difference, then its kinetic energy is

A

B
1840 eV

C
1 eV

D
1840 c² eV

Solution
Question 6
4 / -1

Energy of electrons can be increased by allowing them

A
To fall through electric potential

B
To move in high magnetic field

C
To fall from great heights

D
To pass through lead blocks

Solution
Question 7
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 8
4 / -1

Velocity ratio of the two cathode rays is 1 : 2. They are applied to the same electric field. What is the deflection ratio of the two cathode rays

A
1 : 2

B
1 : 4

C
4 : 1

D
8 : 1

Solution
Question 9
4 / -1

A
1.6 ×10^–19 C

B
3.2 × 10^–19 C

C
4.8 × 10^–19 C

D
8.0 × 10^–19 C

Solution
Question 10
4 / -1

Cathode rays are

A
Positive rays

B
Neutral rays

C
He rays

D
Electron waves