GOV EXAM ADDA

1. Bohr’s model can explain

A. Spectrum of any atom or ion having one electron only

B. Solar spectrum

C. Spectrum of hydrogen atom only

D. Spectrum of hydrogen molecule

Answer & Solution

2. All isotopes of the same element have

A. The same atomic number and the same atomic mass

B. The same atomic number but different atomic mass

C. Different atomic numbers and different atomic mass

D. Different atomic number and the same atomic mass

Answer & Solution

3. Which of the following is not Electromagnetic in nature?

Answer & Solution

4. Atoms of different elements have

A. Different atomic number and different number of valence electrons

B. same number of electrons and neutrons

C. same atomic number and same electronic configuration

D. Different atomic number and same electronic configuration

Answer & Solution

5. “The position and velocity of a small particle like electron can not be simultaneously determined” This statement is

A. De-broglie wave nature of electron

B. Heisenberg uncertainty principle

C. Aufbau principle

D. Pauli’s exclusion principle

Answer & Solution

9. wavelength of which of the following colours of the visible spectrum of light are maximum absorbed by green plants

A. Blue and Yellow

B. Green and red

C. Green and yellow

D. Red and blue

Answer & Solution

10. Atoms having same no of neutron but different no of electrons or protons are called?

Answer & Solution

11. Atoms of same element having different mass numbers are called

Answer & Solution

12. Who discovered X-ray?

Answer & Solution

13. The reserve effect of X-rays emission is

A. Zeeman effect

B. Photo- electric effect

C. Raman effect

D. Compton effect

Answer & Solution

14. Isobars have

A. Same mass and atomic numbers

B. Different mass and atom8ic numbers

C. Same mass numbers but different atomic numbers

D. Different mass numbers but same atomic numbers

Answer & Solution

15. Atoms having the same number of protons but different number of neutrons are called

Answer & Solution

16. Which one of the following is the correct sequence of wavelength of radiation?

A. UV > Hard X - rays >IR > Green

B. IR > Hard X -Rays > Green > UV

C. UV > Green > IR > Hard X - rays

D. IR > Green > UV > Hard X - rays

Answer & Solution

17. 40Ar18 40K19 40Ca20 called

Answer & Solution

18. Which of the following is not true about X rays?

A. Refracted

B. Can affect Photographic plates

C. Low power

D. Travel with the speed of light

Answer & Solution

19. Chemical properties of isotopes

A. Need not be Different

B. Need not be same

C. Must be Different

D. Must be Same

Answer & Solution

20. By which one of the following, an old written material which can not be read easily, can be read?

Answer & Solution

21. What is contained in Chlorophyll?

Answer & Solution

22. What is contained in Chlorophyll?

Answer & Solution

1. Bohr’s model can explain

2. All isotopes of the same element have

3. Which of the following is not Electromagnetic in nature?

4. Atoms of different elements have

5. “The position and velocity of a small particle like electron can not be simultaneously determined” This statement is

6. Nuclides have same atomic different mass numbers are called

7. who was the first to explain hydrogen spectrum?

8. which of the following has the lowest frequency?

9. wavelength of which of the following colours of the visible spectrum of light are maximum absorbed by green plants

10. Atoms having same no of neutron but different no of electrons or protons are called?

11. Atoms of same element having different mass numbers are called

12. Who discovered X-ray?

13. The reserve effect of X-rays emission is

14. Isobars have

15. Atoms having the same number of protons but different number of neutrons are called

16. Which one of the following is the correct sequence of wavelength of radiation?

17. 40Ar18 40K19 40Ca20 called

18. Which of the following is not true about X rays?

19. Chemical properties of isotopes

20. By which one of the following, an old written material which can not be read easily, can be read?

21. What is contained in Chlorophyll?

22. What is contained in Chlorophyll?