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Which type of mirror is used in the following?
Shaving mirror
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Match the first column with appropriate entries in the second and third columns and remake the table.
| S.No. | Column 1 | Column 2 | Column 3 |
| 1 | Negative acceleration | The velocity of the object remains constant. | A car, initially at rest reaches a velocity of 50 km/hr in 10 seconds. |
| 2 | Positive acceleration | The velocity of the object decreases. | A vehicle is moving with a velocity of 25 m/s. |
| 3 | Zero acceleration | The velocity of the object increases. | A vehicle moving with the velocity of 10 m/s, stops after 5 seconds. |
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Complete a sentence and explain it.
Deceleration is ______ acceleration.
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Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy.
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If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy ______.
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The potential energy of your body is least when you are ______.
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The following figure shows the symbols for components used in the accompanying electrical circuit. Place them at proper places and complete the circuit.
Which law can you prove with the help of above circuit?
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Resistances R1, R2, R3 and R4 are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.
- Both S1 and S2 are closed.
- Both S1 and S2 are open.
- S1 is closed but S2 is open.
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The accompanying figure shows some electrical appliances connected in a circuit in a house. Answer the following questions.
- By which method are the appliances connected?
- What must be the potential difference across individual appliances?
- Will the current passing through each appliance be the same? Justify your answer.
- Why are the domestic appliances connected in this way?
- If the T.V. stops working, will the other appliances also stop working? Explain your answer.
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Classify aqueous solutions of the following substances according to their pH into three groups: 7, more than 7, and less than 7.
Common salt, sodium acetate, hydrochloric acid, carbon dioxide, potassium bromide, calcium hydroxide, ammonium chloride, vinegar, sodium carbonate, ammonia, and sulphur dioxide.
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Explain the following cycle in your own words with a suitable diagram.
Carbon cycle.
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Which vaccines are given to infants? Why?
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How is a vaccine produced?
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How do antibiotics cure disease?
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Are the antibiotics given to humans and animals the same? Why?
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Why is it necessary to safely store the pathogens of a disease against which vaccines are to be produced?
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What are ‘broad-spectrum antibiotics'?
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Define antibiotic.
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Write note.
Industrial waste
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Write note.
Plastic waste
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