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The mirror used in search light is ______.
Concept: undefined >> undefined
The angle of deviation of light ray in a prism depends on the angle of ______.
Concept: undefined >> undefined
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Match the following.
| 1. | Ratio of height of image to height of object. | Concave mirror |
| 2. | Used in hairpin bends in mountains. | Total internal reflection |
| 3. | Coin inside water appearing slightly raised. | Magnification |
| 4. | Mirage | Convex mirror |
| 5. | Used as Dentist’s mirror. | Refraction |
Concept: undefined >> undefined
a) Draw ray diagrams to show how the image is formed using a concave mirror, when the position of object is:
- at C
- between C and F
- between F and P of the mirror.
b) Mention the position and nature of image in each case.
Concept: undefined >> undefined
A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
Concept: undefined >> undefined
Ice is kept in a double-walled container. Why?
Concept: undefined >> undefined
Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?
Concept: undefined >> undefined
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through ______.
Concept: undefined >> undefined
The sound waves travel faster ______.
Concept: undefined >> undefined
Sound is a ______ wave and needs a material medium to travel.
Concept: undefined >> undefined
Number of vibrations produced in one second is ______.
Concept: undefined >> undefined
Vibration of object produces ______.
Concept: undefined >> undefined
Match the following.
| 1. | Tuning fork | The point where density of air is maximum |
| 2. | Sound | Maximum displacement from the equilibrium position. |
| 3. | Compressions | The sound whose frequency is greater than 20,000 Hz. |
| 4. | Amplitude | Longitudinal wave. |
| 5. | Ultasonics | Production of sound. |
Concept: undefined >> undefined
Through which medium sound travels faster, iron or water? Give reason.
Concept: undefined >> undefined
How does the sound produced by a vibrating object in a medium reach your ears?
Concept: undefined >> undefined
Describe with diagram, how compressions and rarefactions are produced.
Concept: undefined >> undefined
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Concept: undefined >> undefined
Diffentiate between absorption and adsorption.
Concept: undefined >> undefined
