Electric Spark and Life's Internal secrets Test No. 2

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SECTION A  18 MARKS

Q1. Choose the correct alternative and rewrite the following: (2 marks)

1.     To increase the effective resistance in a circuit, the resistors are connected in _________

a.      Series

b.     Parallel

c.     Both ways

d.     None of these

2.     1 kilowatt hr = ____________ Joules.

a.      4.6 x 10⁶ Joule

b.     3.6 x 10⁶ Joule

c.     30.6 x 10⁶ Joule

d.     3.6 x 10⁵ Joule

Q2. State True or False. If false correct it. ( 3 marks)

1.     The SI unit of charge is volt.

2.     Resistivity of pure metal is more than alloys.

3.     The electric bulb consists of the filament whose melting point is low.

Q3.  Give scientific reasons. (6 marks)

1.     The material used for fuse has low melting point.

2.     Connecting wires in a circuit are made of copper and aluminium.

Q4. Differentiate between. (4 marks)

1.     Resistances in series and parallel.

2.     Conductors and insulators.

Q5. State the laws: ( 3 marks)

Ohm’s law

SECTION B (25 MARKS)

Q1. Fill in the blanks.  (2 marks)

1.     ________________ artery takes the blood to the lungs for oxygenation.

2.     Lymph flows in ____________ direction.

Q2. Correct the following statements.  (2 marks)

1.     Aquatic animals breathe at a slower rate than the terrestrial animals.

2.     Calcium oxalate crystals present in the cells of some plants are called as resins.

Q3. Give scientific reasons. (6 marks)

1.     Breathing rate increases during vigorous exercising.

2.     It is necessary to separate oxygenated blood from the deoxygenated blood in mammals.

Q4. Draw a well labelled diagram of the following. (6 marks)

1.     Human excretory system.

2.     Human digestive system

Q5. Answer the following. (4 marks)

1.     How are fats digested in the human body?

Q6. Answer briefly: (5 marks)

1.     Explain the process of translocation in plants.