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You spill a bucket of soapy water on a marble floor accidentally
|
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0
|
1153
|
March 22, 2018
|
|
. Suppose your writing desk is tilted a little. A book kept on it starts sliding down
|
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0
|
3269
|
March 22, 2018
|
|
A father and son pushed their car to bring it to the side of road as it had stalled in the middle of the road
|
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0
|
1447
|
March 22, 2018
|
|
A marble is allowed to roll down an inclined plane from a fixed height
|
|
0
|
2020
|
March 22, 2018
|
|
Cartilage is present in the joints of our body which helps in their smooth movement
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0
|
3908
|
March 22, 2018
|
|
Is there a force of friction between the wheels of a moving train and iron rails?
|
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0
|
3089
|
March 22, 2018
|
|
You might have noticed that when used for a long time, slippers with rubber soles become slippery. Explain the reason
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0
|
3047
|
March 22, 2018
|
|
Sketch larynx and explain its function in your own words
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0
|
29411
|
March 22, 2018
|
|
What is the difference between noise and music? Can music become noise sometimes?
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|
0
|
986
|
March 22, 2018
|
|
Suggest four measures to limit noise pollution in your locality
|
|
0
|
1382
|
March 22, 2018
|
|
How is sound produced and how is it transmitted and heard by us?
|
|
0
|
4628
|
March 22, 2018
|
|
List sources of noise pollution in your surroundings
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|
0
|
9302
|
March 22, 2018
|
|
Your parents are going to buy a house
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|
0
|
664
|
March 22, 2018
|
|
Explain in what way noise pollution is harmful to humans
|
|
0
|
1204
|
March 22, 2018
|
|
We have a stringed musical instrument. The string is plucked in the middle first with a force of greater magnitude and then with a force of smaller magnitude
|
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0
|
4718
|
March 22, 2018
|
|
An alarm bell is kept inside a vessel as shown in the figure below
|
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0
|
6451
|
March 22, 2018
|
|
Identify the part which vibrates to produce sound in the following instruments
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|
0
|
849
|
March 22, 2018
|
|
The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?
|
|
0
|
2494
|
March 22, 2018
|
|
A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency
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|
0
|
1265
|
March 22, 2018
|
|
Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reasons
|
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0
|
2143
|
March 22, 2018
|
|
Suppose a stick is struck against a frying pan in vacuum. Will the frying pan vibrate?
|
|
0
|
2586
|
March 22, 2018
|
|
We have learnt that vibration is necessary for producing sound. Explain why the sound produced by every vibrating body cannot be heard by us
|
|
0
|
773
|
March 22, 2018
|
|
A simple pendulum makes 10 oscillations in 20 seconds. What is the time period and frequency of its oscillation?
|
|
0
|
1927
|
March 22, 2018
|
|
List four uses of electroplating
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|
0
|
15007
|
March 22, 2018
|
|
You are provided with a magnetic compass, an empty matchbox
|
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0
|
2393
|
March 22, 2018
|
|
Observing that the bulb does not glow7 in the circuit shown below in A
|
|
0
|
696
|
March 22, 2018
|
|
Boojho made the circuit shown below. He wanted to observe what happens when an electric current is passed through water. But he forgot to add a few drops of lemon juice to water. Will it make any difference to his observations? Explain
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|
0
|
4818
|
March 22, 2018
|
|
Observe the circuit given below
|
|
0
|
1597
|
March 22, 2018
|
|
An electric current is passed through a conducting solution. List four possible observations
|
|
0
|
1443
|
March 22, 2018
|
|
Observe the following circuit given below
|
|
0
|
630
|
March 22, 2018
|