Advertisements
Advertisements
Why does an empty vessel produce more sound than a filled one?
Concept: undefined >> undefined
Mention two cases in which there is no Doppler effect in sound?
Concept: undefined >> undefined
Advertisements
Two observers are stationed in two boats 4.5 km apart. A sound signal sent by one, under water, reaches the other after 3 seconds. What is the speed of sound in the water?
Concept: undefined >> undefined
Name three animals which can hear ultrasonic vibrations.
Concept: undefined >> undefined
Suppose that a sound wave and a light wave have the same frequency, then which one has a longer wavelength?
Concept: undefined >> undefined
Unit of radioactivity is _______
Concept: undefined >> undefined
Which of the following statements is/are correct?
- α particles are photons
- Penetrating power of γ radiation is very low
- Ionization power is maximum for α rays
- Penetrating power of γ radiation is very high
Concept: undefined >> undefined
88Ra226 experiences three α - decay. Find the number of neutrons in the daughter element.
Concept: undefined >> undefined
Match the following
| Column A | Column B | |
| a) | Atavism | caudal vertebrae and vermiform appendix |
| b) | Vestigial organs | a forelimb of a cat and a bat’s wing |
| c) | Analogous organs | rudimentary tail and thick hair on the body |
| d) | Homologous organs | a wing of a bat and a wing of an insect |
| e) | Wood park | radiocarbon dating |
| f) | W.F. Libby | Thiruvakkarai |
Concept: undefined >> undefined
Planting trees increases the groundwater level.
Concept: undefined >> undefined
The volume occupied by 4.4 g of CO2 at S.T.P ______
Concept: undefined >> undefined
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
Concept: undefined >> undefined
In the nucleus of `""_20"Ca"^40`, there are ______
Concept: undefined >> undefined
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Concept: undefined >> undefined
Atoms of different elements having the same number of ______ are called isotones.
Concept: undefined >> undefined
Atoms of one element can be transmuted into atoms of other elements by ______
Concept: undefined >> undefined
The number of atoms present in a molecule is called its ______.
Concept: undefined >> undefined
1 mole of Gold and Silver contain same number of atoms.
Concept: undefined >> undefined
Give the salient features of “Modern atomic theory”.
Concept: undefined >> undefined
The number of periods and groups in the periodic table are ______
Concept: undefined >> undefined
