Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?

Assertion : Our ears cannot distinguish two notes,one produced by a violin and other by a sitar, if they have exactly the same intensity and same frequency Reason:When a musical instrument is played it produces a fundamental note which is accompanied by number of overtones called harmonics

The number of moles of ions produced when one mole of Potassium Ferricyanide is dissolved in water is

A man is watching two trains, one leaving and the other coming in with equal speeds of 4 m//s . If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air = 320 m//s ) will be equal to

The number of beats produced per second by two tuning forks when sounded together is 4, If one of them has a frequency of 250 Hz,the frequency of other cannot be more than

There are 10 persons among whom two are brothers. The total number of ways in which these persons can be seated around a round table so that exactly one person sits between the btothers, is equal to:

Ultraviolet light of wavelength 300nn and intensity 1.0Wm^-2 falls on the surface of a photosensitive material. If one per cent of the incident photons produce photoelectrons, then the number of photoelectrons emitted per second from an area of 1.0 cm^2 of the surface is nearly

Why is plant food not produced in any other parts of the plant except the green ones?

The same quantity of electricity is passed through two cells one containing AlCl3 solution and the other containing ZnCl2 solution. If 0.04 mole of Al is produced in the first cell, the number of moles of Zn produced in the second cell will be

Questions based on paragraph : Sound is propagated in a material medium in the form of compression and rarefactions. One compression and one rarefaction together form one cycle of the sound wave. The number of cycles produced per second is called as frequency. A tuning fork is a two-pronged device which vibrates to produce sound when struck. The frequency of a tuning fork is decided by the dimensions of the prong and the material used for making the fork. When these sound waves reach ears of listener, his ear-drum vibrates. Accordingly specific signals are conveyed to the brain and the listener gets a sense of hearing sound. : When vibrations are produced, what physical properties of air are changed?