Chemistry Class 11 Question Answer & Video

Planck’s Quantum Theory

Video For All Chapters Chemistry Class 11

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. The energy of a photon in Joules that has a wavelength of 9.0 m is:

6.0 ×10^-23

4.5 ×10²⁵

4.5 × 10^-25

2.2 ×10^-26

Question 1 of 20

2. The ratio of the energy of a photon of 2000 Ǻ wavelength radiation to that of 4000 Ǻ radiation is:

2

½

¼

4

Question 2 of 20

3. A radio operator broadcast on the 6-meter band. The frequency of this electromagnetic radiation is __________ MHz.

500

20

50

200

Question 3 of 20

4. Electromagnetic radiation travels through vacuum at a speed of __________ m/s.

10,000

It depends on wavelength.

3.00 × 10⁸

186,000

Question 4 of 20

5. What is the frequency in Hz of electromagnetic radiation that has a wavelength of 0.53 m?

1.3 × 10^-33

5.7 × 10⁸

1.8 × 10^-9

1.6 × 10⁸

Question 5 of 20

6. What is the frequency of light in s^-1 that has a wavelength of 3.12 x 10^-3 cm?

9.62 × 10¹²

1.04 ×10¹³

2.44 × 10¹⁶

3.69

Question 6 of 20

7. The ejected electrons from the surface of metal in photoelectric effect are called:

Photoelectrons

Proton

Electron

Neutron

Question 7 of 20

8. If the value of azimuthal quantum number is 3, the possible values of magnetic quantum numbers would be:

0, 1, 2, 3

3, -2, -1, +1, +2, +3

0, -1, -2, -3

3, -2, -1, 0, +1, +2, +3

Question 8 of 20

9. What is the energy of a photon that has a wavelength of 12.3 nm?

4.42 × 10^-23 J

1.6x 10^-17 J

1.51 × 10^-17 J

1.99 × 10^-25 J

Question 9 of 20

10. Which of the following set of quantum numbers represents the highest energy of an atom?

n=3, l=2, m=1, m_s=+1/2

n=3, l=1, m=1, m_s =+1/2

n=4, l=0, m=0, m_s=+1/2

n=3, l=0, m=0, m_s=+1/2

Question 10 of 20

11. What is correct about wave number?

It is defined as the number of waves which pass through a particular point in one second

It is defined as the number of wavelengths per unit length

It is defined as the distance between two neighbouring crests or troughs of wave

It is the distance travelled by a wave in one second

Question 11 of 20

12. The wavelength of light that has a frequency of 1.20 × 10¹³s^-1 is __________ m.

2.50 × 10^-5

0.0400

25.0

12.0

Question 12 of 20

13. What is the relation between wavelength, frequency and velocity:

A

B

C

D

Question 13 of 20

14. What is the wavelength of a photon that has energy of  5.25 × 10^-19 J ?

3.79 × 10^-7

4.21 × 10^-24

2.64 × 10⁶

2.8 × 10²³

Question 14 of 20

15. Which of the following radiation has the shortest wavelength.

Infra red

ultraviolet

microwave

X-ray

Question 15 of 20

16. Which of the following is represented by  

Wave number

Frequency

Velocity

Wavelength

Question 16 of 20

17. Who discovered and first used the constant h = 6.6 x 10^-34 J.s?

De Broglie

Einstein

Bohr

Planck

Question 17 of 20

18. The energy of a photon of light has what kind of proportionality to its frequency and its wavelength.

directly, inversely

inversely, directly

inversely, inversely

directly, directly

Question 18 of 20

19. What is the wavelength of light (nm) that has a frequency 4.62 ×10¹⁴s^-1?

1.54 × 10^-3

649

932

1.07 × 10⁶

Question 19 of 20

20. What is the frequency of a photon that has an energy of 3.7 × 10^-18J?

2.5 × 10^-15

0.55 X 10⁺¹⁶

1.8 × 10^-16

5.6 × 10¹⁵

Question 20 of 20

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