B) Answer in brief (any 2)
1) What are the preventing measures for noise pollution ?
2) With the help of the diagram explain lever of the 1st, 2nd, 3rd order.
4) Describe the natural Chain of transformation of energy.
C) Write Short Note On (any 2)
1) A Sundial.
2 ) Solar energy
3) Acoustics.
D) Draw the Diagram & give the Labels ( any 1)
1) Electromagnet.
2) The screw as an inclined plane.
Answers
Answer:
1.We can Reduce Noise pollution by turning off appliances when not in use, use of earplugs, lowering the volume, planting more trees, regular maintenance of vehicles and machines etc. By controlling noise we can control negative health effects that noise pollution has on everyone.
4.The sun transforms nuclear energy into ultraviolet, infrared, and gamma energy all forms of electromagnetic energy. ... Our bodies convert chemical energy from food into mechanical and electrical energy to allow us to move. 5. A natural gas stove converts chemical energy from burning into thermal energy used to cook food.
short note:
1.a sundial is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the dial) and a gnomon, which casts a shadow onto the dial.
2.Solar energy is radiant light and heat from the Sun that is harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture, molten salt power plants and artificial photosynthesis.
3.Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound.
Explanation:
i hope this answer is right