11th
In this category students supposed to ask questions which belong to std 11th maharashtra board Science
- Give reason: Liquid possesses properties such as fluidity, definite volume and ability to take shape of the bottom Molecules of liquid are held together by moderately strong intermolecular forces and can move about within the boundary of the liquid. As a... 1
- Name some measurable properties of liquid. Density Boiling point Freezing point Vapour pressure Surface tension Viscosity. 1
- What are the factors affecting vapour pressure? Factors affecting vapour pressure: Nature of liquid: Liquids having relatively weak intermolecular forces possess high vapour pressure. Such... 1
- Explain how temperature affects surface tension. Surface tension is a temperature dependent property. When attractive forces are large, surface tension is large. Surface tension decreases a... 1
- Mention some applications of surface tension. Applications of surface tension: Cleaning action of soap and detergent is due to the lowering of interfacial tension between water and oily... 1
- Give reason: Liquid droplets acquire spherical shape. For a given volume of a liquid, spherical shape always imparts minimum surface area thereby reducing the surface tension. Hence, liquid drop... 2
- Define: Coefficient of viscosity Coefficient of viscosity is defined as the degree to which a fluid resists flow under an applied force, measured by the tangential frictiona... 1
- Describe various factors affecting viscosity of a liquid. Factors affecting viscosity of a liquid: i. Temperature: Viscosity is a temperature dependent property. Viscosity ∝ 1/ Temperature ii. Natur... 1
- Describe three daily life instances where viscosity plays an important role. Lubricating oils are viscous liquids. Gradation of lubricating oils is done on the basis of viscosity. A good quality lubricating oil does n... 1
- A balloon containing 0.6 mol of helium gas has a volume of 1.5 L. i. The volume of the balloon increases. ii. The volume of the balloon decreases. 2
- In an experiment conducted to study the diffusion of gases using same experimental conditions, following data i. Volume of gas A diffused = 50 cm³ Time required for diffusion = 7 minutes = 7 × 60 seconds Rate\ of\ diffusion\ of\ a\ gas =Volume\ of \... 1
- What makes the oil rise through the wick in an oil lamp? In an oil lamp, oil rises through the wick due to the capillary action. Such a capillary rise of oil is due to surface tension of oil. The w... 1
- Where is Dalton’s law applicable? Air is gaseous mixture of different gases. Dalton’s law is useful for the study of various phenomena in air, for example, air pollution. 1
- Do all pure gases and mixtures of gases obey the gas laws? Yes, the gas laws are also applicable to the mixtures of gases. The measurable properties of mixture of the gases such as pressure, temperat... 1
- Derive the formula for kinetic energy of a particle having mass m and velocity v using dimensional analysis Kinetic energy of a body depends upon mass (m) and velocity (v) of the body. Let K.E. ∝ m^x v^y ∴ K.E. = km^x v^y …….. (1) where, k = dimens... 1
- Describe what is meant by significant figures and order of magnitude. Significant figures: Significant figures in the measured value of a physical quantity is the sum of reliable digits and the first uncertain... 1
- Give your suggestions in two sentences. How you will cheer up one of your lonely classmates. I can cheer up my lonely classmate by giving him/her company and involving in some activities together. We can sit together in the classroom... 1
- “Girls are quiet and like to play nurse”. Do you Agree or Disagree? Justify your answer. I do not agree to the statement. There is no hard and fast rule about this impression about girls. There may be many boys who are very quiet... 1
- Use your imagination and extend the story in about 100 to 130 words. Jo had a nice time with Laurie and his grandpa having tea and snacks which she enjoyed thoroughly. Both of them were very interesting charac... 1
- Make a note about how people amused themselves in earlier times without TV, internet or social media for entertainment. In earlier times when TV, internet and social media did not make people slaves of these sorts of entertainments, people used to socialize a... 1
- Are friends different from neighbors? Are you friends with your neighbors? Give examples and write. It is not necessary to have one’s friend as one’s neighbor always. If it happens that way, then one is lucky. Friendship does not depend on... 1
- Give reasons, for us being reluctant to make friends with some strangers, but being Strangers are always mysteries for us. But some people have the inherent simplicity which instantly attract us towards them and we long to b... 1
- Narrate in 100 words an incident, that illustrates the way a friend of yours ‘made you feel happy and accepted That was my first day at school. I was just five years old. When my parents left me in school and I entered the classroom. I felt so lonely... 1
- “I’m not afraid of anything”, returned Jo with a toss of the head. “I don’t believe you are !” exclaimed the boy. With a toss of the head Jo emphatically told that she was not afraid of anything. The boy was not surprised at her claim and agreed with her... 1