A neutron bomb is a small nuclear weapon which makes use of a neutron-rich substance. This emits neutrons and gamma rays lethal within a radius of 1 to 2 kilometre. It does not destroy concrete structures and plant life, but only humans and animals. Deaths are caused due to penetration of neutrons and gamma rays. An atom bomb produces energy …

Shampoo or soap molecules have two chemically distinct parts, that interact differently with water. One part is a long hydrocarbon chain which is water hating (hydrophobic) and non-polar and another belongs to COONA group which is polar, water-loving (hydrophilic) and creates the foam in water. The hydrophilic part makes soap water-soluble. The hydrophobic part combines with dirt and other elements. …

‘The Flowers of Painted Lady’ plants contain an insecticidal element, pysellethein, which is the main ingredient used in mosquito repellent coils and mats. Just about 2 to 4 microorgams of this element is enough to kill a mosquito. Lesser doses of this paralyses them. However, pysellethein does not affect the warm-blooded species. An average mat or coil contains only 40 …

Certain rocks give off high energy radiation due to the presence of radioactive substances in them. Radioactive substances have got the property of decay (break down of active material with the passage of time). For example, uranium decays giving rise to lead. By measuring the amount of lead-present in the uranium sample scientists can determine the ages of rocks by …

The solid state of matter in which the atoms or molecules are arranged in a definite repetitive geometric patterns is known as crystal. Liquid metals, alloys, minerals and some organic materials solidify into crystalline form. A slower rate of cooling results in a larger crystal. Crystals have flat boundary planes or faces. A diamond is an allotrope (another form) of …

दिल्ली तथा देश के अन्य महानगरों के साथ-साथ अब तो छोटे शहरों में भी विभिन्न कारणों से प्रदूषण में अत्यधिक वृद्धि होती जा रही है। इससे न सिर्फ पर्यावरण को भारी क्षति पहुंच रही है बल्कि बच्चों और बड़ों दोनों के ही स्वास्थ्य पर प्रतिकूल प्रभाव पड़ रहा है। आज दिल्ली विश्व के सर्वाधिक प्रदूषित शहरों में से एक बन …

An anti-particle is a sub-atomic particle that has the same mass as another particle and equal but opposite values of some other property or properties. For example, positron is the anti-particle of electron having a positive charge. Similarly, anti-proton has the negative charge. Anti-matter is postulated to consist of matter made up of anti-particles. For example, anti-hydrogen would consist of …

Nargis (June 1, 1929 – May 3, 1981) was a fabulous actress, whose performance in the film ‘Mother India’ was widely appreciated. The film was nominated for Oscars. She was born as Fatima Rashid to the Mohyal Brahmin. She was the daughter Allahabad-based singer, Jaddanbai and Uttamchand Mohanchand. Well, in this article, we will provide you with the biography of Indian actress Nargis. The father …

In winters our body has to work more actively to adjust to the difference between the body temperature and the atmospheric temperature. It is because of this that the sensation of pain appears more in winter than in summers. Funny Logic The flow of blood under the skin is sluggish during winters due to the contracting of surface blood vessels. …

Birds are warm blooded creatures, whereas reptiles are not. It means that birds, like human beings, have an automatic system of keeping the temperature of the body warm, controlled in hypothalamus in the brain. Reptiles on the other hand, including fish, amphibians and invertebrates are poikilothermic-their body temperature fluctuates with the temperature of the surroundings. As such the poikilothermic creatures do not …