Advertisements
Advertisements
Draw figure ‘Electric motor’ and working
Concept: undefined >> undefined
What is the Principle of an Electric motor?
Concept: undefined >> undefined
Advertisements
Name any four appliances where electric motor is used.
Concept: undefined >> undefined
Complete the following reaction, balance it and write the name of the products CuO + HCI →_________ + _________
Concept: undefined >> undefined
Name the product obtained when Plaster of Paris is mixed with water. State the use of the product. Give two uses of POP.
Concept: undefined >> undefined
When the substance ‘A’ is added to a solution of BaSO4, a yellow precipitate is formed.
- What do you think substance A is likely to be?
- Name the precipitate.
- Which type of reaction is this?
Concept: undefined >> undefined
State whether the following statement is true or false.
An electric motor converts mechanical energy into electrical energy.
Concept: undefined >> undefined
1 calorie = _________ joule.
Concept: undefined >> undefined
If a bulb of 60W is connected across a source of 220V, find the current drawn by it.
Concept: undefined >> undefined
Explain the construction and working of an electric motor.
Concept: undefined >> undefined
Label the four parts of an electric motor
Concept: undefined >> undefined
write two uses of DC motor
Concept: undefined >> undefined
An element has its electron configuration as 2, 8, 2. Now answer the following question.
a. What is the atomic number of this element?
b. What is the group of this element?
c. To which period does this element belong?
d. With which of the following elements would this element resemble? (Atomic numbers are given in the brackets)
N(7), Be(4), Ar(18), Cl(17)
Concept: undefined >> undefined
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
3Li, 14Si, 2He, 11Na, 15P Which of these elements belong to be period 3?
Concept: undefined >> undefined
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
1H, 7N, 20Ca, 16S, 4Be, 18Ar Which of these elements belong to the second group?
Concept: undefined >> undefined
Tell the odd one out. Give proper explanation.
Loud speaker, Microphone, Electric motor, Magnet.
Concept: undefined >> undefined
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
7N, 6C, 8O, 5B, 13Al Which is the most electronegative element among these?
Concept: undefined >> undefined
Give scientific reason.
It takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappears rapidly.
Concept: undefined >> undefined
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
4Be, 6C, 8O, 5B, 13Al Which is the most electropositive element among these?
Concept: undefined >> undefined
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
11Na, 15P, 17Cl, 14Si, 12Mg Which of these has largest atoms?
Concept: undefined >> undefined
