Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 23

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Weekly Quiz Competition

Question 1
4 / -1

When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of

A
infrared rays

B
radiowaves

C
X – rays

D
Light waves
Question 2
4 / -1

The potential difference applied to an X – ray tube is 5kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is

A

B

C

D

Solution
Question 3
4 / -1

In Thomson’s experiment of finding e/m for electrons, beam of electron is replaced by that of muons (particle with same charge as that of electrons but of mass 208 times that of electron). No deflection condition in this case is satisfied if.

A
B is increased 208 times

B
E is increased 208 times

C
B is increased 14.4 times

D
None of these

Solution
Question 4
4 / -1

The speed of an electron having a wavelength of 10^-10 m is

A

B

C

D

Solution
Question 5
4 / -1

An X–ray photon has a wavelength 0.01Å. Its momentum (in kg ms^-1) is (Given h = 6.6 × 10^-34 Js)

A

B

C

D
0

Solution
Question 6
4 / -1

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

A
540 nm

B
400 nm

C
310 nm

D
220 nm

Solution
Question 7
4 / -1

A charged oil drop is suspended in a uniform electric field of 3 × 10⁴ V/m so that it neither falls nor rises . The charge on the drop will be (take the mass of the drop is 9.9 × 10^-15 kg and g = 10 ms^-2)

A

B

C

D

Solution
Question 8
4 / -1

Which of the following have highest specific charge?

A
Positron

B
Proton

C
α − particle

D
none of these
Question 9
4 / -1

Particle A and B have electric charge + q and + 4 q. Both have mass m. If both are allowed to fall under the same p.d., ratio of velocities v_A/v_B =

A
2 : 1

B
1 : 2

C
1 : 4

D
4 : 1

Solution
Question 10
4 / -1

Energy of photon having wavelength λ is 2 eV. This photon when incident on metal. maximum velocity of emitted is v. If λ is decreased 25% and maximumu velocity is made double, work function of metal is ........ev

A
1.2

B
1.5

C
1.6

D
1.8

Solution