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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.
