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Write the chemical equation for the following activity.
Dilute nitric acid was added to calcium oxide.
Concept: undefined >> undefined
Write the chemical equation for the following activity.
Dilute nitric acid was added to calcium oxide.
Concept: undefined >> undefined
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Complete the following table.
| u (m/s) | a (m/s2) | s (m) | v2 = u2 + 2as (m/s)2 |
| 4 | 3 | ______ | 8 |
| ______ | 5 | 8.4 | 10 |
Concept: undefined >> undefined
An electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m?
Concept: undefined >> undefined
If a 1200 W electric iron is used daily for 30 minutes, how much total electricity is consumed in the month of April?
Concept: undefined >> undefined
Choose one or more correct alternatives.
Power is a measure of the ______.
- The rapidity with which work is done.
- Amount of energy required to perform the work.
- The slowness with which work is performed.
- Length of time.
Concept: undefined >> undefined
Umesh has two bulbs having resistances of 15 Ω and 30 Ω. He wants to connect them in a circuit, but if he connects them one at a time the filament gets burnt. Answer the following.
- Which method should he use to connect the bulbs?
- What are the characteristics of this way of connecting the bulbs depending on the answer of A above?
- What will be the effective resistance in the above circuit?
Concept: undefined >> undefined
The resistance of a conductor of length x is r. If its area of cross-section is a, what is its resistivity? What is its unit?
Concept: undefined >> undefined
Identify the odd one out and justify.
Concept: undefined >> undefined
Classify the following oxides into three types and name the types.
CaO, MgO, CO2, SO3, Na2O, ZnO, Al2O3, Fe2O3
Concept: undefined >> undefined
Write down the changes that will be seen in the instance and explain the reason behind them.
Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.
Concept: undefined >> undefined
Explain coordination in plants with the help of suitable examples.
Concept: undefined >> undefined
Write a short note.
Xylem
Concept: undefined >> undefined
Write the differences.
Simple tissue and complex tissue in plants.
Concept: undefined >> undefined
Explain by giving a scientific reason.
The roof of a movie theatre and a conference hall is curved.
Concept: undefined >> undefined
Explain by giving a scientific reason.
The intensity of reverberation is higher in a closed and empty house.
Concept: undefined >> undefined
Where and why are sound-absorbing materials used?
Concept: undefined >> undefined
Complete the following table.
| u (m/s) | a (m/s2) | t (sec) | v = u + at (m/s) |
| 2 | 4 | 3 | ______ |
| ______ | 5 | 2 | 20 |
Concept: undefined >> undefined
Complete the following table.
| u (m/s) | a (m/s2) | t (sec) | s = ut + `1/2`at2 (m) |
| 5 | 12 | 3 | ______ |
| 7 | ______ | 4 | 92 |
Concept: undefined >> undefined
Give example.
Metals with variable valency
Concept: undefined >> undefined
