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BidishaKashayap1333
@bidishakashayap1333
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Joined: Oct 11, 2021
Last seen: Jul 27, 2023
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Topics: 2174 / Replies: 0
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Topic
Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?
4 years ago
Forum
Matter in Our Surroundings
Replies: 0
Views: 82
Topic
When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?
4 years ago
Forum
Matter in Our Surroundings
Replies: 0
Views: 282
Topic
Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own?
4 years ago
Forum
Matter in Our Surroundings
Replies: 0
Views: 174
Topic
Name two processes which provide the best evidence for the motion of particles in matter.
4 years ago
Forum
Matter in Our Surroundings
Replies: 0
Views: 91
Topic
What are the conditions for ‘something’ to be called ‘matter’?
4 years ago
Forum
Matter in Our Surroundings
Replies: 0
Views: 80
Topic
Which of the following can produce longitudinal waves as well as transverse waves under different conditions?
4 years ago
Forum
Sound
Replies: 0
Views: 118
Topic
The velocities of sound waves in four media P, Q, R, and S are 18000 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which medium could be a liquid substance?
4 years ago
Forum
Sound
Replies: 0
Views: 230
Topic
When the pitch of note produced by a harmonium is lowered, then the wavelength of the note:
4 years ago
Forum
Sound
Replies: 0
Views: 261
Topic
The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance?
4 years ago
Forum
Sound
Replies: 0
Views: 106
Topic
The sound waves travel fastest (a) in solids (b) in liquids (c) in gases (d) in vacuum
4 years ago
Forum
Sound
Replies: 0
Views: 208
Topic
The maximum speed of vibrations which produce audible sound will be in:
4 years ago
Forum
Sound
Replies: 0
Views: 257
Topic
In the sound wave produced by a vibrating tuning fork shown in the diagram, half the wavelength is represented by
4 years ago
Forum
Sound
Replies: 0
Views: 300
Topic
Sound travels in air: (a) if particles of medium travel from one place to another (b) if there is no moisture in the atmosphere
4 years ago
Forum
Sound
Replies: 0
Views: 202
Topic
Which one of the following does not consist of transverse waves?
4 years ago
Forum
Sound
Replies: 0
Views: 241
Topic
A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through
4 years ago
Forum
Sound
Replies: 0
Views: 233
Topic
If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then λ for this wave in cm will be
4 years ago
Forum
Sound
Replies: 0
Views: 103
Topic
Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?
4 years ago
Forum
Sound
Replies: 0
Views: 86
Topic
Which of the following statement best describes frequency? (a) the maximum disturbance caused by a wave (b) the number of complete vibrations per second
4 years ago
Forum
Sound
Replies: 0
Views: 92
Topic
When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why? (b) How could you convince a small child that when you speak, it is not necessary...
4 years ago
Forum
Sound
Replies: 0
Views: 198
Topic
Explain the terms ‘crests’ and ‘trough’ of a wave? What type of waves consist of crests and troughs? (b) The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man.
4 years ago
Forum
Sound
Replies: 0
Views: 80
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