In going from a rarer to denser medium, the ray of light bends ______.
Concept: Light
The angle of deviation of light ray in a prism depends on the angle of ______.
Concept: Light
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: Light
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: Light
A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
Concept: Heat and Its Unit
Ice is kept in a double-walled container. Why?
Concept: Heat and Its Unit
Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?
Concept: Sound
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: Sound
Sound is a ______ wave and needs a material medium to travel.
Concept: Sound
Number of vibrations produced in one second is ______.
Concept: Sound
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: Sound
Through which medium sound travels faster, iron or water? Give reason.
Concept: Sound
How does the sound produced by a vibrating object in a medium reach your ears?
Concept: Sound
Describe with diagram, how compressions and rarefactions are produced.
Concept: Sound
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Concept: Matter (Substance)
