Q. A free falling object under gravity in air has a decreasing acceleration due to

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Q. A girl dropped a pen from the top of a building. If the pen is dropped 9 m from the ground, how long would the pen take to hit the ground?

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Q. If an object is released from rest from an unknown height and the acceleration due to free fall is 10 ms⁻², then the speed of the object just before it hits the ground would be

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Q. If you release a light piece of paper having a large surface area, the air resistance acting on it is

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Q. From the following, the very poor conductor of heat is

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Q. The vacuum flask is designed to keep liquids hot by minimizing heat loss in

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Q. Where direct heating is involved, the utensils are usually made up of

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Q. The dense feathers and a layer of fat under the skin allows the penguins to withstand temperatures below

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Q. The heating coil of the electric kettle is always placed at the kettle's

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Q. To help plants grow better by trapping heat in cold climates, we use

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Q. Due to good insulator property, to cover ice blocks, we use

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Q. The shiny surfaces are

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Q. Double-glazed windows have air trapped between two panes of glass, which reduce

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Q. Soldering iron rods are made of iron with the tip made of

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Q. During boiling, temperature remains constant at the

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Q. During condensation temperature remains constant at the

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Q. The boiling point of mercury is

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Q. The reverse process of boiling is termed as

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Q. A typical graph of temperature against time is called the

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Q. When a pure liquid is heated and it changes to vapor at a fixed temperature, the state is called

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