Mary saw a ship travelling on a sea. She knows that iron nail sinks in water. She has many doubts. What are her doubts ? Write them.

Harini is a pregnant. She has a doubt that how all the nutrients are supplied to the fetus. What is your answer to her doubt?

Akshay saw the specification of a bulb as 60 W and 120 V, on the surface of the bulb. She got many doubts in her mind. What would be those double ?

James saw N+O_(2)rarr 2NO-Q on the blackboard and got some doubts in his mind. What would be those doubts? Guess and write four of them.

There are 40 students in Class X of a school of whom 25 are girls and 15 are boys. The class teacher has to select one student as a class representative. She writes the name of each student on a separate cards, the cards being identical . Then she puts cards in a box and stirs them thoroughly. She then draws one card from the box.What is the probability that the name written on the card is the name of a girl

There are 40 students in Class X of a school of whom 25 are girls and 15 are boys. The class teacher has to select one student as a class representative. She writes the name of each student on a separate cards, the cards being identical . Then she puts cards in a box and stirs them throughly. She then draws one card from the box.What is the probability that the name written on the card is the name of a boy?

Kavya observed that a discharged dry cell which kept in sun light by her father for few hours got ability to glow LED. She got many doubts and questions to raise. Can you guess those questions or doubts? (AS_(2))

Answer carefully: (a) Two large conducting spheres carrying charges Q_(1) and Q_(2) are brought close to each other. Is the magnitude of electrostatic force between them exactly given by Q_(1),Q_(2)//4pi epsilon_(0)r^(2) , where r is the distance between their centres? (b) If Coulomb’s law involved 1//r^(3) dependence (instead of would Gauss’s law be still true ? (c) A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point? (d) What is the work done by the field of a nucleus in a complete circular orbit of the electron? What if the orbit is elliptical? (e) We know that electric field is discontinuous across the surface of a charged conductor. Is electric potential also discontinuous there? (f) What meaning would you give to the capacitance of a single conductor? (g) Guess a possible reason why water has a much greater dielectric constant (= 80) than say, mica (= 6).

Answer the following question Radha has doubts about gastritis. She consulted a doctor. What questions she might have asked him about Gastritis ?

Observe the conversation of Siri and Bhavya. Siri: Bhavya, I am not able to draw the ray diagrams of mirror. Bhavya : Siri, do you know the laws of reflection . Do you know the Fermat's principle. Basing on above conversation, Bhavya taught how to draw ray diagrams to Siri, asking her some questions which she known. Do you know what Bhavya asked Siri.Write atleast 4 questions.