1:   Angle between wave velocity and particle velocity of a longitudinal wave is -------
Options:
1. 90 degree
2. zero degree
3. 60 degree
4. 120 degree

Explanation:

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2:   When a wave undergoes refraction
Options:
1. its amplitude changes
2. its frequency changes
3. its velocity changes
4. both amplitude and velocity change

Explanation:

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3:   The velocity of sound is maximum in---
Options:
1. oxygen
2. nitrogen
3. carbon
4. hydrogen

Explanation:

Since velocity is inversely proportional to square root of molecular weight,hydrogen having low molecular weight will show highest velocity Discuss this in Forums

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4:   If the temperature of the gaseous medium drops by 1%,the velocity of sound in that medium is ----------
Options:
1. increased by 5%
2. remain unchanged
3. decreased by 0.5%
4. increased by 0.5%

Explanation:

Sorry, No description available.

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5:   The ratio of the velocity of the body to the velocity of sound is ----------
Options:
1. Natural number
2. Magic number
3. Laplace number
4. Match number

Explanation:

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6:   The pitch of the sound wave is related to its -------
Options:
1. amplitude
2. velocity
3. frequency
4. beats

Explanation:

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7:   The heater element in an electric stove is made of ---------
Options:
1. copper
2. platinum
3. tungsten
4. nichrome

Explanation:

Sorry, No description available.

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8:   A small telescope has an objective lens of focal length 140 cm and eye piece of focal length 5cm.What is the magnifying power when the final image is at 25 cm?
Options:
1. 23.6
2. 33.6
3. 32.6
4. 36

Explanation:

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9:   The minimum distance between an object and its real image formed by a convex lens is -----
Options:
1. 4f
2. 2f
3. 3f
4. 2.5f

Explanation:

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10:   Just before the time of sun set,the sun appears to be elliptical because
Options:
1. of the scattering of light
2. the effect of refraction
3. effect of polarisation
4. the effect of diffraction

Explanation:

Sorry, No description available.

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A ship is safe in harbor, but that's not what ships are for.
-William G.T. Shedd