Why does a black board appears black in colour
Answered 7 yr ago
bhavishya kumarCorrect Answer: It absorbs all the coloursA black object may look black, but, technically, it may still be reflecting some light. For example, a black pigment results from a combination of several pigments that col...Read more
What is the minimum distance (in metres) required to hear an echo
Answered 7 yr agoCorrect Answer: 17The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C. Therefore, the reflecting object must be more than 17.2m from the sound source for echo to be perceived by a person located at the source....Read more
Anaemia is caused because of deficiency of which of the following? िनिलखत मसेिकस की कमी के कारण एनीिमया होती है? Options: 1) Cobalt कोबा 2) Iron लोहा 3) Sodium सोिडयम 4) Calcium कै यम
Answered 7 yr agoCorrect Answer: IronVitamin B-12 deficiency can cause these and other health problems before it leads to anemia. Scurvy. Vitamin C deficiency can lead to scurvy...Read more