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______ is the plant in which leaves are modified into spines.
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True or False – If False give the correct answer
Analgesics are the substances that lower the temperature during fever
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Match the following
| 1. | Antipyretic | reduce pain |
| 2. | Analgesic | reduce body temperature |
| 3. | Antacid | spontaneous combustion |
| 4. | Phosphorus | ORS Solution |
| 5. | Carbon – di – oxide | leads to respiratory problem. |
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Assertion: The Speedometer of a car or a motor-cycle measures its average speed.
Reason: Average velocity is equal to total displacement divided by total time taken.
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Exercise Problems.
A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 ms–2, with what velocity will it strike the ground? After what time will it strike the ground?
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Resistance of a wire depends on, ______.
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How are the home appliances connected in general, in series or parallel. Give reasons.
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Exercise.
The values of current (I) flowing through a resistor for various potential differences V across the resistor are given below. What is the value of resistor?
| I (ampere) | 0.5 | 1.0 | 2.0 | 3.0 | 4.0 |
| V (volt) | 1.6 | 3.4 | 6.7 | 10.2 | 13.2 |
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Which of the following converts electrical energy into mechanical energy?
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An electric motor converts ______.
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State whether true or false. If false, correct the statement.
The speed of rotation of an electric motor can be increased by decreasing the area of the coil.
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List the main parts of an electric motor.
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Write the differences between elements and compounds and give an example for each.
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Complete the following table.
| Atomic Number | Mass Number | Number of Neutrons | Number of Protons | Number of Electrons | Name of the Element |
| 9 | ______ | 10 | ______ | ______ | ______ |
| 16 | ______ | 16 | ______ | ______ | ______ |
| ______ | 24 | ______ | ______ | 12 | Magnesium |
| ______ | 2 | ______ | 1 | ______ | ______ |
| ______ | 1 | 0 | 1 | 1 | ______ |
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What are nucleons? How many nucleons are present in Phosphorous? Draw its structure.
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Buckminster Fullerene contains ______ carbon atoms.
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Match the following.
| Antipyretics | Large surface area |
| Corrosion prevention | Iodine-131 |
| Hyperthyroidism | Fever |
| Nanoparticle | Body building |
| Proteins | Electroplating |
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The skeletal framework of Porifera is ______.
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Comment on the aquatic and terrestrial habits of amphibians.
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