Chemistry-
General
Easy
Question
Light a candle and observe its flame, you will find that it is spindle-shaped and has different colours in different regions. The flame has three main zones depending on the amount of air it receives.
Which zone is least hot zone
- Dark zone
- Luminous zone
- Non-luminous zone
- None of these.
The correct answer is: Dark zone
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What does this experiment show?
What does this experiment show?
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Students were carrying out an experiment in the laboratory, in which one of the steps involved heating the alcohol. However, the teacher strictly instructed the students not to heat alcohol directly on flame. Why do you think the teacher gave such an instruction?
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When you introduce a glass plate into the luminous zone of a candle flame for a few seconds, the observation is as shown in figure
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Which of the following is an ideal fuel?
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Inflammable substances have an ignition temperature :
Inflammable substances have an ignition temperature :
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Carbon exist in two allotropic forms (i) crystalline and (ii) Amorphous. These allotropes of carbon having well defined crystal structures are : diamond, graphite and fullerenes. In diamond each carbon is tetrahedrally linked to four neighbouring carbon atoms through four strong bonds. This network extends in three dimension and is very rigid. In graphite each carbon is linked to three other carbon atoms forming hexagonal rings and form sheet like (layered) structure. The various sheets or layers are held together by weak Vander wall force of attraction.
In graphite, electrons are
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In graphite, electrons are
Chemistry-General
Chemistry-
The nature of chemical bond in diamond is:
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Chemistry-General
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4HNO3 + C 
CO2 + 2H2O + NO2
Which of the following statements is true for the above reaction?
4HNO3 + C CO2 + 2H2O + NO2
Which of the following statements is true for the above reaction?
Chemistry-General
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Graphite is also known as
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Coal is an impure form of carbon in which percentage of carbon varies from _____ to _____
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Chemistry-General
Chemistry-
The mass of the electron is:
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Chemistry-General
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What is the ratio of mass of an electron to the mass of a proton?
What is the ratio of mass of an electron to the mass of a proton?
Chemistry-General
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In Rutherford’s atomic model, the electrostatic force of attraction between the positively and negatively charged particles is counter balanced by
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Chemistry-General
Physics-
Two coils have a mutual inductance 0.005 H The current changes in the first coil According to equation I =I0 sin 
where I0 = 10A and 
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Physics-General
Physics-
The energy of the cm waves is of the order of 15 ke VTO which part of the spectrum does it belong ?
The energy of the cm waves is of the order of 15 ke VTO which part of the spectrum does it belong ?
Physics-General
