Questions
The lusture of metallic heritages in Kathmandu valley are fading day by day. What is its main cause? Also write any one chemical equation supporting your answer.
Consider you are suffering with high fever and there is no any health centre nearby you. What can you apply to lower the fever? Also, mention the reason.
How do the chordates without vertebral column link the classification with evolution of organism? Mention any two points.
Cement, glass, ceramics, plastic, fibre, chemical fertilizer, soap, pesticides, detergents are the chemical pollutants. Write any two ways to minimize the effect of mutation caused by the pollutants among them.
A gold ring was lost in a field. When the ring was found after two months, it was found no change in its weight, why?
A student used powder of calcium carbonate rather than marble pieces for the laboratory preparation of CO$\rm _2$ gas.
- Write a balanced chemical equation for the chemical reaction mentioned above.
- Why did he/she use powder of marble instead of marble chips?
"Role of gravitational force is very important for the birth and death of a star." Justify the statement.
Consider you have to use air in breaking system of a four wheeler and in an immersed submarine to float it on water. What changes will you make in air pressure for them?
What is the frequency of DC? Why?
Why did Mendel not select mustard plant for his experiment? Mention any two points.