Please select a subject first
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Write any two characteristics of a series combination of resistors.
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Explain the construction and working of an electric motor.
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An object is held 20 cm away from a converging lens of focal length 10 cm. Find the position of the image formed.
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Label the four parts of an electric motor
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Write the new Cartesian sign convention for spherical lenses.
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What is a solenoid?
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Tell the odd one out. Give proper explanation.
Loud speaker, Microphone, Electric motor, Magnet.
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Give scientific reason.
It takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappears rapidly.
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Which device is used to produce electricity? Describe with a neat diagram.
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What is meant by specific heat capacity?
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How will you prove experimentally that different substances have different specific heat capacities?
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Name and state the principle used to measure the specific heat capacity of a substance.
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Read the following paragraph and answer the questions.
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If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. |
- Heat is transferred from where to where?
- Which principle do we learn about from this process?
- How will you state the principle briefly?
- Which property of the substance is measured using this principle?
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Solve the following problems:
Equal heat is given to two objects A and B of mass 1 g. Temperature of A increases by 3°C and B by 5°C. Which object has more specific heat? And by what factor?
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A calorimeter has mass 100 g and specific heat 0.1 kcal/ kg °C. It contains 250 gm of liquid at 30°C having specific heat of 0.4 kcal/kg °C. If we drop a piece of ice of mass 10 g at 0°C, What will be the temperature of the mixture?
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At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object? Draw a figure.
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Give a scientific reason.
Simple microscope is used for watch repairs.
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Solve the following example.
5 cm high object is placed at a distance of 25 cm from a converging lens of focal length of 10 cm. Determine the position, size and type of the image.
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Solve the following example.
An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is it a converging lens or diverging lens?
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Explain the following term with an example.
Functional group
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