16th June, 2013,
STRT -1, Full marks – 45, Time – 1 ½ hr
1.
Write balanced equation for
the following chemical reactions (a)Hydrogen + Chlorine à
Hydrogen chloride (b)Sodium + Water à Sodium hydroxide + Hydrogen (c)Sodium
hydroxide solution (in water) reacts hydrochloric acid solution (in water) to
produce sodium chloride solution and water.
2.
Differentiate between
respiration and photosynthesis, write their equation and balance them, what
happens to glucose in aerobic, anaerobic respiration.[5]
3.
In an experiment with iron
nail dipped in copper sulphate solution, why does the iron nail become brownish
in colour and blue colour of copper sulphate solution disappear. [3]
4.
Give a balanced example each
of (a) double displacement (b) exothermic (c) endothermic (d)double
displacement reaction[4
5.
What are the benefits of
separation of oxygenated blood from deoxygenated blood in mammals and aves.
With the help of a diagram show the course of flow of blood in human
circulatory system. What are the components of transport system in human beings?
[2+2+1]
6.
Describe the structure and
functioning of nephrons. What are the necessary conditions for autotrophic
nutrition and what are its byproducts. [3+2]
7.
Differentiate between artery
and veins. [5]
8.
How much current will an electric bulb draw from a 220 V source, if the
resistance of the bulb filament is 1200 Ω? (b) How much current will an
electric heater coil draw from a 220 V source, if the resistance of the heater
coil is 100 Ω?[5]
9.
An electric lamp, whose
resistance is 20 Ω, and a conductor of 4 Ω resistance are connected to a 6 V
battery in series. Calculate (a) the
total resistance of the circuit, (b) the current through the circuit, and (c)
the potential difference across the electric lamp and conductor. [5]
10.
What are the advantages of
connecting electrical devices in parallel with the battery instead of
connecting them in series? [3]
11.
Derive an equation for a
system of resistors in series. [2]
