Science Part 1
science maharashtra board 10th
- a. What is meant by latent heat? How will the state of matter transform if latent heat is given off? The amount of heat needed to change the state of unit mass of the body from solid to liquid or from liquid to gas without any change in temp... 1
- c. In cold regions in winter, the rocks crack due to anomalous expansion of water. Water has the property of expanding below 4^oC, is called the anomalous behaviour of water. Thus, in cold regions when the temperature falls... 1
- b. How can you relate the formation of water droplets on the outer surface of a bottle taken out of refrigerator with formation of dew? If the temperature of unsaturated air is decreased, a temperature is reached at which the air becomes saturated with water vapour. In both t... 1
- a. What is the role of anomalous behaviour of water in preserving aquatic life in regions of cold climate? The anomalous behaviour of water is that it contracts from 0^oC to 4^oC and beyond 4^oC it expands. Thus, the density of water is maximum at... 1
- Explain the following temperature versus time graph. In the given graph, line AB represents conversion of ice into water at constant temperature. When ice is heated, it melts at 0^oC and conver... 1
- While deciding the unit for heat, which temperatures interval is chosen? Why? While deciding the unit for heat (which is calorie), the temperature interval chosen is 14.5^oC-15.5^oC. We know that the amount of heat rel... 1
- What is meant by specific heat capacity? How will you prove experimentally that different substances have different specific heat capacities? The amount of heat energy required to raise the temperature of a unit mass of an object by 1 °C is called the specific heat capacity of that... 1
- 2. Observe the following graph. Considering the change in volume of water as its temperature is raised from 0 o C, If the temperature of water is raised from 0 °C to 10 °C, its volume goes on decreasing in the range 0 °C to 4 °C. It is minimum at 4 °C. Th... 1
- 1. Fill in the blanks and rewrite the sentence. a. The amount of water vapour in air is determined in terms of its--------- Answer: The amount of water vapour in air is determined in terms... 1
- 11. Identify the figures and explain their use. (a) Figure (a) is cartridge type fuse which is fitted with costly appliances like refrigerator, AC, geyser, TV etc. They have a proper curre... 1
- Name the following diagrams and explain the concept behind them. a. It represents Fleming's right hand ruleused for finding the direction of induced current with respect to the directions of the magnetic f... 1
- What is a solenoid? Compare the magnetic field produced by a solenoid with the magnetic field of a bar magnet. Draw neat figures and name various components. A solenoid is a long straight insulated wire, such as a copper coil, often wrapped around a cylinder-shaped body. The diameter of the soleno... 1
- Which of the statement given below correctly describes the magnetic field near a long, straight current carrying conductor? Correct option is D d. The magnetic lines of force are in concentric circles with the wire as the center, in a plane perpendicular to the co... 1
- In practice the unit kWh is used for the measurement of electrical energy, rather than joule. Electrical energy = Electrical power × time. For practical applications, devices consuming high electrical power are used over a period of t... 1
- For electric power transmission, copper or aluminium wire is used. Copper or aluminum are metals which have free electrons so they are good conductors of electricity. They have a low value of resistivity and... 1
- In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc. an alloy such as Nichrome is used, not pure metals In the electric equipment producing heat, such as iron, electric heater, boiler, toaster etc., an alloy such as Nichrome is used, not pure m... 1
- a. Tungsten metal is used to make a solenoid type coil in an electric bulb. Tungsten metal has high resistance and high melting point (nearly 3422⁰C) Because of current it gets heated at high temperature and emits li... 1
- 6. How does the short circuit form? What is its effect? The household electrical connections mainly consist of live, neutral and earth wires. The potential difference between live and neutral wire... 1
- 5. Which device is used to produce electricity? Describe with a neat diagram. a. Electric motor b. Galvanometer c. Electric Generator (DC) d. Voltmeter Electric Generator is used to Produce Electricity According to Fleming’s right hand rule, electric current is produced in the branches AB an... 2
- 4. Explain the difference : AC generator and DC generator. AC generator DC generator i. It produces alternating current. It produces direct current. ii. It has two simple ring-type commutators. It ha... 1
- Electromagnetic induction means- Correct option is C c. Generation of a current in a coil due to relative motion between the coil and the magnet 1
- An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? Video Solution : https://youtu.be/N6KYVnGWloU Text solution 3
- Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins? hope it helped 2
- Two tungsten bulbs of wattage 100 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow Correct answer is 0.72 Ampere 1