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State two ways to prevent the rusting of iron.
Painting & Greasing.
Painting & Greasing.
See lessdoes air exert friction on an object moving through it?
Yes. The air exerts/applies friction on the object movie through it. e.g If an object or a body falls from the sky then the body gets burned due to the heat generated by the friction of the air.
Yes. The air exerts/applies friction on the object movie through it. e.g If an object or a body falls from the sky then the body gets burned due to the heat generated by the friction of the air.
See lessTwo pith balls, each of mass 5 x 10⁻⁴ kg, are suspended from the same point by silk threads 0.2 m lonh. Equal charges are given to the balls which separate until the threads enclose an angle of 30°. Calculate the charge on each ball.
3.95 x 10-8 C.
3.95 x 10-8 C.
See lessA charge Q is to be divided on two small objects separated by a certain distance. What should be the value of the charges on the objects so that the force between them is maximum?
The charge should be equally divided on the two objects.
The charge should be equally divided on the two objects.
See lessTwo point charges are 3 m apart and their combined charge is 20μC. If the force between them is 0.075 N, what are the charges?
15μC and 5μC.
15μC and 5μC.
See lessWhat is Internal Forces?
Forces that take place inside the surface of the earth are called Internal Forces.
Forces that take place inside the surface of the earth are called Internal Forces.
See lessWhat do you observe?
We have observed that magnesium ribbon burns with a dazzling white flame changes into a white powder. The powder is magnesium oxide. It is formed due to the reaction between magnesium and oxygen present in the air.
We have observed that magnesium ribbon burns with a dazzling white flame changes into a white powder. The powder is magnesium oxide. It is formed due to the reaction between magnesium and oxygen present in the air.
See lessHow do we come to know that a chemical reaction has taken place?
Whenever a chemical change occurs, we can say that a chemical reaction has taken place. Any of the following observations helps us to determine whether a chemical reaction has taken place: change in colour change in temperature change in state evaluation of a gas.
Whenever a chemical change occurs, we can say that a chemical reaction has taken place. Any of the following observations helps us to determine whether a chemical reaction has taken place:
- change in colour
- change in temperature
- change in state
- evaluation of a gas.
See lessWhen does a chemical reaction occur?
Whenever a chemical change occurs that means a chemical reaction has taken place.
Whenever a chemical change occurs that means a chemical reaction has taken place.
See lessConsider the following situations of daily life and think what happens when:
In all the above situations , the nature and the identity of the initial substance have somewhat changed i.e chemical reactions have taken place.
In all the above situations , the nature and the identity of the initial substance have somewhat changed i.e chemical reactions have taken place.
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