GROUP
'A': PHYSICS
1.
(a) Why value of ‘g’ is not same for different places of
earth surface? Prove that
Newton's Universal Law of Gravitation. A object of mass 50kg is placed on the distance of 6400km from the
surface of earth find the weight of object when it is placed on the 9900km
from the earth surface. (1+2+1.5=4)
(b) Write any three necessary conditions required
for the sun to occur nuclear fusion reaction "We might face
energy crisis in near future" Justify the statement. (1.5+2=3.5)
2.
(a) Prove that the liquid pressure P=hdg. A deep
sea diver can dive up to a depth of 250m. Calculate the pressure of water at
this depth.(1.5+2=3.5)
(b) State Pascal's law. An iron ball sinks in the
water but a ship made up of iron floats on water, why? What do you mean by
Hydrometer? (2+1+1=4)
3. (a) State principle of Calorimetry. When 50 gm of
water at 70oc is mixed with 30 gram of water at 15oc then
find the resultant temperature. (1+2.5=4.5)
(b) Differentiate
between convex and concave lens. What is the power of lens, if its focal length
is 40 cm? (2+1=3)
4.
(a) What do you mean by electromagnet? A primary
winding of a transformer is 1000 turns and it is connected with 6A, 220V. The
output is 110V. Calculate the number of the turns in secondary coil and
electrical energy consumed by primary coil 20 hours if rate is rs.5 (1+2.5=3.5)
(b) What do you mean by electroplating? Write
difference between step up and step down transformer. Which coil is used in
filament lamp, why? (1+2+1=4)
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