A teacher one day pointed out to his students the peculiar fact that water is a unique liquid which freezes exactly at `0^(@)C`.and boils exactly at `100^(@)C`. He asked the students to find the correct statement based on this fact.

A teacher one day pointed out to his students the peculiar fact that water is unique liquid which freezes exactly at 0^@C and boils exactly at 100^@C . He asked the students to find the correct statement based on this fact :

Water frezes at 0^(@)C and boils at 100^(@)C . Write an inequality to show the range of temperature (t) for which water is a liquid.

Mohan was asked by his teacher to determine the boiling point of a liquid. He set up the apparatus as shown in the figure. He recorded the boiling point of the liquid as 140^(@)C and reported the reading to this teacher. The teacher asked him to repeat the experiment after dipping the bulb of the thermometer in the liquid and also placing the beaker on a tripod stand covered with a wire gauze. After reading this narration, answer the following question : (i) Was the reading taken by the student correct ? (ii) What was the necessity of wire gauze? (iii) How did teacher help the student? (iv) What is teh value based information associated with this?

If a temperature scale defined the freezing point of water as 100^(@) and the boiling point is 0^(@) . What temperature on thils scale corresponds to 25^(@)C ?

Mathematics teacher of a school took her 10th standard students to show Red fort. It was a part of their Educational trip. The teacher had interest in history as well. She narrated the facts of Red fort to students. Then the teacher said in this monument one can find combination of solid figures. There are 2 pillars which are cylindrical in shape. Also 2 domes at the corners which are hemispherical.7 smaller domes at the centre. Flag hoisting ceremony on Independence Day takes place near these domes. Find the lateral surface area of two pillars if height of the pillar is 7m and radius of the base is 1.4m.

Mohan was asked by his teacher to determine the boiling point of a liquid. He set up the appartus as shown in the figure. He rocorded the boiling point of the liquid as 140^(@)C and reported the reading to this teacher. The teacher asked him to repeat the experiment after dipping the bulb of the thermometer in the liquid and also placing the beaker on a tripod stand covered with a wire gauze. After reading this narration, answer the following question : (i) Was the reading taken by the student correct ? (ii) What was the necessity of wire gauze? (iii) How did teacher help the student? (iv) What is teh value based information associated with this?

A clerk was asked to mail three report cards to three students. He addresses three envelopes but unfortunately paid no attention to which report card be put in which envelope. What is the probability that exactly one of the students received his or her own card?