Please select a subject first
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Describe the construction and working of the Pycnometer.
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Assertion: The mirrors used in torch lights are parabolic, not concave.
Reason: The image formed by a concave mirror is always virtual.
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Assertion: The nature of the image depends on the size of the mirror.
Reason: Small mirrors always form a virtual image.
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Which kind of mirrors are used in the shaving mirror? Why?
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Which mirror is used as a reflector? Why?
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Match the following:
| Column I | Column II | ||
| 1. | A plane mirror | a. | The image is erect & smaller in size than the object. |
| 2. | A concave mirror | b. | The image is erect & of the same size as the object. |
| 3. | A convex | c. | Used by dentists to see an enlarged image of teeth. |
| d. | Can form images of objects spread over a large area. |
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Match the following:
| Column I | Column II | ||
| 1. | plane mirror | a. | Focal length is positive. |
| 2. | concave | b. | The focal length is negative. |
| 3. | convex | c. | The focal length is infinity. |
| 4. | Real image | d. | Magnification if positive value. |
| 5. | Virtual image | e. | Magnification if negative value. |
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What are the three scales of temperature?
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Differentiate between the three temperature scales.
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______ is known as an absolute scale.
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What is the relation between calories and Joule?
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Convert the following
100°F to °C
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Convert the following
40°C to Fahrenheit (°F)
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Convert the following
35°C to Kelvin
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Convert the following
80°K to °C
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How can two whales in the sea, hundreds of kilometers apart, communicate?
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Which of the following metal (s) do not react with water?
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Choose the odd one out and write the reason:
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