: CBSE Sample Question Papers

(Short/V. Short Answer Questions-1, 2 Marks)

1. What features of e.m. waves lead Maxwell to conclude that light itself is electromagnetic wave ?
Answer

2. For an electromagnetic wave, write the relationship between amplitude of electric and magnetic field in free space.
Answer

3. State tour properties or electromagnetic waves.
Answer

4. Why sky waves cannot be used in television broadcasting ?
Answer

5. What is the cut off frequency beyond which the ionosphere does not reflect electromagnetic radiations ?
Answer

6. Give a diagram for which it is clear that “taller the antenna, longer the coverage of the television broadcast.”
Answer

7. What evidence is there to show that sound is not electromagnetic in nature ?
Answer

8. Why is it necessary to use geo-stationary satellite for telecommunication ?
Answer

9. What oscillates in electromagnetic waves ? Are these waves transverse or longitudinal. 10. What was the range of wavelength of electromagnetic waves produced by Prof. J.C. Bose.
Answer

12. wavelength of electromagnetic radiation is doubled. What will happen to the energy of photons ?
Answer

13. Draw a labelled diagram of Hertz’s experiment for production of em waves.
Answer

14. What is electromagnetic constant ?
Answer

15. Arrange in descending order of wavelength y-rays, X-rays and visible light.
Answer

Very Short Answer Type Question

Q.1. For a fish under water viewing obliquely a fisherman standing on the bank of a lake, does the man look taller or shorter than what he actually is ?
Answer

Q. 2. State two properties of image formed by a plane mirror.
Answer

Q. 3. How is power of a lens related to focal length ?
Answer

Q. 4. What is the cause of change in direction of a ray of light on refraction ?
Answer

Q. 5. Define resolving power of an optical instrument. How does it depend on wavelength ?
Answer

Q. 6. In what way Galileo telescope differs from ordinary terrestrial telescope ?
Answer

Q. 7. What is the magnifying power of an astronomical telescope in normal adjustment ? What is its length ?
Answer

Q. 8. What is magnifying power of a microscope. What is it equal to ?
Answer

Q. 9. What is magnifying power of an astronomical telescope when the final image of a distant object is formed at least distance of distinct vision ?
Answer

Q. 10. Give the units of luminous intensity and intensity and illumination.
Answer

Q. 11. What is Lens maker’s formula ?
Answer

Q. 12. What is dispersion of light ?
Answer

Q. 13. What are Fraunhoffer’s lines ?
Answer

Q. 14. In what way, Galileo telescope differs from an ordinary terrestrial telescope ?
Answer

Very Short Answer Type Questions

Q. 1. What are electromagnetic waves ?
Answer

Q. 2. How does the relation c = 1/√µ₀ €₀ indicate that the velocity of all types of em waves in free space is the same?
Answer

Q. 3. What is a plane polarised e.m. wave?
Answer

Q. 4. What is Maxwell’s modification of Ampere’s circuital law?
Answer

Q. 5. What is displacement current?
Answer

Q. 6. Name various layers of earth’s atmosphere.
Answer

Q. 7. What is the use of Ozone layer?
Answer

Q. 8. Large distance radio broadcasts use short wave bands, why? -
Answer