Please select a subject first
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If a 1200 W electric iron is used daily for 30 minutes, how much total electricity is consumed in the month of April?
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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.
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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?
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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?
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Identify the odd one out and justify.
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Classify the following oxides into three types and name the types.
CaO, MgO, CO2, SO3, Na2O, ZnO, Al2O3, Fe2O3
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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.
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Explain coordination in plants with the help of suitable examples.
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Write a short note.
Xylem
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Write the differences.
Simple tissue and complex tissue in plants.
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Explain by giving a scientific reason.
The roof of a movie theatre and a conference hall is curved.
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Explain by giving a scientific reason.
The intensity of reverberation is higher in a closed and empty house.
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Where and why are sound-absorbing materials used?
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Complete the following table.
| u (m/s) | a (m/s2) | t (sec) | v = u + at (m/s) |
| 2 | 4 | 3 | ______ |
| ______ | 5 | 2 | 20 |
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Complete the following table.
| u (m/s) | a (m/s2) | t (sec) | s = ut + `1/2`at2 (m) |
| 5 | 12 | 3 | ______ |
| 7 | ______ | 4 | 92 |
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Give example.
Metals with variable valency
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Identify the odd word out and say why it is the odd one.
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Identify the odd word out and say why it is the odd one.
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Which two main techniques are used in biotechnology? Why?
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Explain the meaning of biotechnology.
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