02 Garima is telling to students. " Female anopheles mosquitoes can causes this specific disease and dengue can be caused by bite of aedes aegypti. These mosquitoes caused disease can be prevented by not allowing them to breed. Symptom of this specific mosquito caused disease is fever with shivering, headache, and naurea alternatively followed by profuse sweating. For treatment of diseases medicine made up of cinchona is taken ". Garima is referring to which disease in the class? 1. chikungunya 2. falaria 3. malaria 4. plague
04 A lemon sinks in normal water floats in salty water because the density of 1. lemon increases in salt water 2. lemon decreases in salt water 3. salt water is more than normal water 4. normal water is more than salt water
06 While performing experiments with water, jyoti observed that an empty steel bowl floats but a small iron nail sinks in water. This can be explained by the fact that 1. iron is lighter than water and steel is heavier than water 2. force on a steel bowl is more than its weight whereas force on an iron nail is less than its weight 3. force on an iron nail is more than its weight whereas force on a steel bowl is lesser than its weight 4. iron is heavier than water and steel is lighter than water